diff --git a/package-lock.json b/package-lock.json
index c9ea8f9a..3ba145f4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,7 +46,7 @@
         "eslint-plugin-no-only-tests": "^3.1.0",
         "google_modes": "git+https://github.com/codemirror/google-modes.git#247b63cee78b3775f8a3173184bf706c5b006d25",
         "playwright": "^1.46.1",
-        "prettier": "^2.0.5",
+        "prettier": "^3.2.2",
         "rollup": "^3.2.5",
         "rollup-plugin-copy": "^3.3.0",
         "rollup-plugin-lit-css": "^4.0.0",
@@ -7229,15 +7229,15 @@
       }
     },
     "node_modules/prettier": {
-      "version": "2.8.8",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.8.tgz",
-      "integrity": "sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==",
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.3.3.tgz",
+      "integrity": "sha512-i2tDNA0O5IrMO757lfrdQZCc2jPNDVntV0m/+4whiDfWaTKfMNgR7Qz0NAeGz/nRqF4m5/6CLzbP4/liHt12Ew==",
       "dev": true,
       "bin": {
-        "prettier": "bin-prettier.js"
+        "prettier": "bin/prettier.cjs"
       },
       "engines": {
-        "node": ">=10.13.0"
+        "node": ">=14"
       },
       "funding": {
         "url": "https://github.com/prettier/prettier?sponsor=1"
diff --git a/package.json b/package.json
index 53124652..976a1ab7 100755
--- a/package.json
+++ b/package.json
@@ -289,7 +289,7 @@
     "eslint-plugin-no-only-tests": "^3.1.0",
     "google_modes": "git+https://github.com/codemirror/google-modes.git#247b63cee78b3775f8a3173184bf706c5b006d25",
     "playwright": "^1.46.1",
-    "prettier": "^2.0.5",
+    "prettier": "^3.2.2",
     "rollup": "^3.2.5",
     "rollup-plugin-copy": "^3.3.0",
     "rollup-plugin-lit-css": "^4.0.0",
diff --git a/playground-styles.css b/playground-styles.css
index 3003b222..5f4cb383 100644
--- a/playground-styles.css
+++ b/playground-styles.css
@@ -383,8 +383,10 @@ div.CodeMirror-dragcursors {
   margin: 0;
   padding: 0;
 
-  box-shadow: rgba(0, 0, 0, 0.2) 0px 5px 5px -3px,
-    rgba(0, 0, 0, 0.14) 0px 8px 10px 1px, rgba(0, 0, 0, 0.12) 0px 3px 14px 2px;
+  box-shadow:
+    rgba(0, 0, 0, 0.2) 0px 5px 5px -3px,
+    rgba(0, 0, 0, 0.14) 0px 8px 10px 1px,
+    rgba(0, 0, 0, 0.12) 0px 3px 14px 2px;
   border: 1px solid var(--playground-code-selection-background, silver);
 
   background: var(--playground-code-background, white);
diff --git a/scripts/theme-generator.js b/scripts/theme-generator.js
index 35fb320c..5d755e13 100644
--- a/scripts/theme-generator.js
+++ b/scripts/theme-generator.js
@@ -32,7 +32,7 @@ import CleanCSS from 'clean-css';
 
 const rootDir = pathlib.resolve(
   pathlib.dirname(url.fileURLToPath(import.meta.url)),
-  '..'
+  '..',
 );
 
 const mkdirAndWriteUtf8 = async (path, data) => {
@@ -63,7 +63,7 @@ const postMinifyCss = (css) => {
   // most of it.
   css = css.replace(
     / none repeat scroll 0% 0%\s*\/\s*auto padding-box border-box/g,
-    ''
+    '',
   );
   // The computed value of a `border` property includes all values even when
   // width is 0. We can strip off the rest when width is 0.
@@ -73,12 +73,12 @@ const postMinifyCss = (css) => {
 
 const makeThemeCss = (themeName, results, defaultResults) => {
   const excludeDefaults = Object.values(results).filter(
-    (r) => defaultResults[r.to].value !== r.value
+    (r) => defaultResults[r.to].value !== r.value,
   );
   return postMinifyCss(
     minifyCss(`.playground-theme-${themeName} {
 ${excludeDefaults.map(({to, value}) => `  ${to}: ${value};`).join('\n')}
-}`)
+}`),
   );
 };
 
@@ -121,7 +121,7 @@ const main = async () => {
   ]);
   const themeFilenames = fs
     .readdirSync(
-      pathlib.resolve(rootDir, 'node_modules', 'codemirror', 'theme')
+      pathlib.resolve(rootDir, 'node_modules', 'codemirror', 'theme'),
     )
     .filter((name) => !excludeThemes.has(name));
   const themeNames = [];
@@ -131,17 +131,17 @@ const main = async () => {
     const styleUrl = `/node_modules/codemirror/theme/${filename}`;
     const results = await page.evaluate(
       ([themeName, styleUrl]) => window.probe(themeName, styleUrl),
-      [themeName, styleUrl]
+      [themeName, styleUrl],
     );
     const css = makeThemeCss(themeName, results, defaultResults);
     writes.push(
-      mkdirAndWriteUtf8(pathlib.join(rootDir, 'themes', filename), css)
+      mkdirAndWriteUtf8(pathlib.join(rootDir, 'themes', filename), css),
     );
     writes.push(
       mkdirAndWriteUtf8(
         pathlib.join(rootDir, 'src', 'themes', `${filename}.ts`),
-        makeCssModule(css)
-      )
+        makeCssModule(css),
+      ),
     );
   }
 
@@ -156,8 +156,8 @@ ${themeNames
     (themeName) =>
       `import t${themeName.replace(
         /-/g,
-        '_'
-      )} from '../themes/${themeName}.css.js';`
+        '_',
+      )} from '../themes/${themeName}.css.js';`,
   )
   .join('\n')}
 
@@ -171,8 +171,8 @@ ${themeNames
   writes.push(
     mkdirAndWriteUtf8(
       pathlib.join(rootDir, 'src', 'configurator', 'themes.ts'),
-      allThemesTs
-    )
+      allThemesTs,
+    ),
   );
 
   await Promise.all([browser.close(), server.stop(), ...writes]);
diff --git a/scripts/update-version-module.js b/scripts/update-version-module.js
index 03c16437..b622722a 100644
--- a/scripts/update-version-module.js
+++ b/scripts/update-version-module.js
@@ -39,7 +39,7 @@ const getServiceWorkerHash = async () => {
   if (matches.length !== 1) {
     throw new Error(
       'Expected exactly one version string in playground-service-worker.js. ' +
-        `Found ${matches.length}.`
+        `Found ${matches.length}.`,
     );
   }
   // We must remove the version string itself from the service worker code
@@ -79,7 +79,7 @@ const oldVersionModuleCode = await fs.readFile(versionModulePath, 'utf8');
 if (oldVersionModuleCode !== newVersionModuleCode) {
   await fs.writeFile(versionModulePath, newVersionModuleCode, 'utf8');
   console.log(
-    'Updated src/shared/version.ts, please commit this change and rebuild.'
+    'Updated src/shared/version.ts, please commit this change and rebuild.',
   );
   // Fail to help the publisher remember to commit.
   process.exit(1);
diff --git a/src/configurator/knobs.ts b/src/configurator/knobs.ts
index dc188d7a..f92254f7 100644
--- a/src/configurator/knobs.ts
+++ b/src/configurator/knobs.ts
@@ -48,25 +48,25 @@ interface SelectKnob<Id extends string, T extends string>
 }
 
 function checkbox<Id extends string>(
-  def: Omit<CheckboxKnob<Id>, 'type'>
+  def: Omit<CheckboxKnob<Id>, 'type'>,
 ): CheckboxKnob<Id> {
   return {type: 'checkbox', ...def};
 }
 
 function slider<Id extends string>(
-  def: Omit<SliderKnob<Id>, 'type'>
+  def: Omit<SliderKnob<Id>, 'type'>,
 ): SliderKnob<Id> {
   return {type: 'slider', ...def};
 }
 
 function color<Id extends string>(
-  def: Omit<ColorKnob<Id>, 'type'>
+  def: Omit<ColorKnob<Id>, 'type'>,
 ): ColorKnob<Id> {
   return {type: 'color', ...def};
 }
 
 function select<Id extends string, T extends string>(
-  def: Omit<SelectKnob<Id, T>, 'type'>
+  def: Omit<SelectKnob<Id, T>, 'type'>,
 ): SelectKnob<Id, T> {
   return {type: 'select', ...def};
 }
diff --git a/src/configurator/playground-configurator.ts b/src/configurator/playground-configurator.ts
index 9fc811e1..c472161f 100644
--- a/src/configurator/playground-configurator.ts
+++ b/src/configurator/playground-configurator.ts
@@ -369,7 +369,7 @@ export class PlaygroundConfigurator extends LitElement {
           <div class="knobs">
             ${knobsBySection[section].map((knob) => this.knob(knob))}
           </div>
-        </section>`
+        </section>`,
     );
   }
 
@@ -489,7 +489,7 @@ ${props.join('\n')}
           (option) =>
             html`<option value=${option} ?selected=${option === value}>
               ${option}
-            </option>`
+            </option>`,
         )}
       </select>
     `;
@@ -570,7 +570,7 @@ ${props.join('\n')}
   }
 
   private async _onThemeDetectorApply(
-    event: CustomEvent<{properties: Map<string, string | null>}>
+    event: CustomEvent<{properties: Map<string, string | null>}>,
   ) {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const values = new Map<KnobId, any>();
@@ -670,7 +670,7 @@ const githubCorner = html`<a
  */
 const toHex = (rgbStr: string): string => {
   const match = rgbStr.match(
-    /^\s*rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)\s*$/
+    /^\s*rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)\s*$/,
   );
   if (!match) {
     return '';
diff --git a/src/configurator/playground-theme-detector.ts b/src/configurator/playground-theme-detector.ts
index 4a239bca..dc352b13 100644
--- a/src/configurator/playground-theme-detector.ts
+++ b/src/configurator/playground-theme-detector.ts
@@ -158,7 +158,7 @@ export class PlaygroundThemeDetector extends LitElement {
               class="color"
               title=${prop}
               style="background:${color ?? 'transparent'}"
-            ></span>`
+            ></span>`,
         )}
       </div>
 
@@ -166,7 +166,7 @@ export class PlaygroundThemeDetector extends LitElement {
         <button
           @click=${this._onClickApply}
           .disabled=${![...this._propertyValues.values()].some(
-            (val) => val !== null
+            (val) => val !== null,
           )}
         >
           Apply
@@ -183,7 +183,7 @@ export class PlaygroundThemeDetector extends LitElement {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     (this._playgroundWithUserText as any)._codemirror.setOption(
       'viewportMargin',
-      Infinity
+      Infinity,
     );
   }
 
@@ -237,7 +237,7 @@ export class PlaygroundThemeDetector extends LitElement {
     const fragmentToProperty = new Map<string, string[]>();
     const ourWalker = document.createTreeWalker(
       this._playgroundWithUserText.shadowRoot!,
-      NodeFilter.SHOW_TEXT
+      NodeFilter.SHOW_TEXT,
     );
     while (ourWalker.nextNode()) {
       const textNode = ourWalker.currentNode;
@@ -248,7 +248,7 @@ export class PlaygroundThemeDetector extends LitElement {
 
       let property;
       const cmClasses = [...parent.classList].filter((c) =>
-        c.startsWith('cm-')
+        c.startsWith('cm-'),
       );
       if (cmClasses.length > 0) {
         // The last CodeMirror class tends to be more specific (e.g. `callee` is
@@ -282,7 +282,7 @@ export class PlaygroundThemeDetector extends LitElement {
     const doc = this._iframeWithUserHtml.contentDocument!;
     const theirWalker = doc.createTreeWalker(
       doc.body,
-      NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT
+      NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT,
     );
     let foundBackground = false;
     while (theirWalker.nextNode()) {
@@ -298,7 +298,7 @@ export class PlaygroundThemeDetector extends LitElement {
       } else if (!foundBackground && node.nodeType === Node.ELEMENT_NODE) {
         // Use the first non-transparent background (depth first).
         const background = window.getComputedStyle(
-          node as Element
+          node as Element,
         ).backgroundColor;
         if (background !== 'rgba(0, 0, 0, 0)') {
           foundBackground = true;
@@ -317,7 +317,7 @@ export class PlaygroundThemeDetector extends LitElement {
         detail: {
           properties: this._propertyValues,
         },
-      })
+      }),
     );
   }
 
diff --git a/src/internal/build.ts b/src/internal/build.ts
index ac00b756..a01dbef8 100644
--- a/src/internal/build.ts
+++ b/src/internal/build.ts
@@ -110,7 +110,7 @@ export class PlaygroundBuild {
       throw new Error(
         `Unexpected BuildOutput kind: ${
           (unreachable(output) as BuildOutput).kind
-        }`
+        }`,
       );
     }
   }
diff --git a/src/internal/tab-bar.ts b/src/internal/tab-bar.ts
index b9032f07..969fcf99 100644
--- a/src/internal/tab-bar.ts
+++ b/src/internal/tab-bar.ts
@@ -80,7 +80,7 @@ export class PlaygroundInternalTabBar extends LitElement {
         new CustomEvent<{tab?: PlaygroundInternalTab}>('tabchange', {
           detail: {tab: undefined},
           bubbles: true,
-        })
+        }),
       );
     }
   }
diff --git a/src/internal/tab.ts b/src/internal/tab.ts
index 81210120..034da34e 100644
--- a/src/internal/tab.ts
+++ b/src/internal/tab.ts
@@ -106,7 +106,7 @@ export class PlaygroundInternalTab extends LitElement {
         new CustomEvent<{tab?: PlaygroundInternalTab}>('tabchange', {
           detail: {tab: this},
           bubbles: true,
-        })
+        }),
       );
     }
   }
diff --git a/src/playground-code-editor.ts b/src/playground-code-editor.ts
index 7fe221ed..444b3d9d 100644
--- a/src/playground-code-editor.ts
+++ b/src/playground-code-editor.ts
@@ -306,7 +306,7 @@ export class PlaygroundCodeEditor extends LitElement {
             if (!docInstance) {
               docInstance = new CodeMirror.Doc(
                 this.value ?? '',
-                this._getLanguageMode()
+                this._getLanguageMode(),
               );
               this._docCache.set(docKey, docInstance);
               createdNewDoc = true;
@@ -474,7 +474,7 @@ export class PlaygroundCodeEditor extends LitElement {
         extraKeys: {
           Tab: () => {
             cm.replaceSelection(
-              Array((cm.getOption('indentUnit') ?? 2) + 1).join(' ')
+              Array((cm.getOption('indentUnit') ?? 2) + 1).join(' '),
             );
           },
           // Ctrl + Space requests code completions.
@@ -488,7 +488,7 @@ export class PlaygroundCodeEditor extends LitElement {
           ['Ctrl-/']: () => cm.toggleComment(),
           ['Cmd-/']: () => cm.toggleComment(),
         },
-      }
+      },
     );
     cm.on('change', (_editorInstance: Editor, changeObject: EditorChange) => {
       this._value = cm.getValue();
@@ -515,7 +515,7 @@ export class PlaygroundCodeEditor extends LitElement {
   private _onRenderLine(
     editorInstance: Editor,
     line: CodeMirror.LineHandle,
-    elt: HTMLElement
+    elt: HTMLElement,
   ) {
     // When wrapping a line the subsequent wrapped code
     // needs to keep the same formatting and have the
@@ -600,14 +600,14 @@ export class PlaygroundCodeEditor extends LitElement {
           provideCompletions: (completions: EditorCompletion[]) =>
             this._onCompletionsProvided(id, completions, cursorIndexOnRequest),
         },
-      })
+      }),
     );
   }
 
   private _onCompletionsProvided(
     id: number,
     completions: EditorCompletion[],
-    cursorIndex: number
+    cursorIndex: number,
   ) {
     // To prevent race conditioning, check that the completions provided
     // are from the latest completions request.
@@ -651,13 +651,13 @@ export class PlaygroundCodeEditor extends LitElement {
                 element,
                 _data,
                 codeEditorHint,
-                i === 0 ? comp.details : undefined // Only render the detail on the first item
+                i === 0 ? comp.details : undefined, // Only render the detail on the first item
               );
             },
             get details() {
               return comp.details;
             },
-          } as CodeEditorHint)
+          }) as CodeEditorHint,
       ) ?? [];
 
     const hints: Hints = {
@@ -679,7 +679,7 @@ export class PlaygroundCodeEditor extends LitElement {
         this._onCompletionSelectedChange?.();
 
         this._renderHint(element as HTMLElement, hints, hint, hint.details);
-      }
+      },
     );
 
     // As CodeMirror doesn't let us directly query if the completion hints are shown,
@@ -712,7 +712,7 @@ export class PlaygroundCodeEditor extends LitElement {
     element: HTMLElement | undefined,
     _data: Hints,
     hint: CodeEditorHint,
-    detail?: Promise<EditorCompletionDetails>
+    detail?: Promise<EditorCompletionDetails>,
   ) {
     if (!element) return;
 
@@ -720,7 +720,7 @@ export class PlaygroundCodeEditor extends LitElement {
     const completionData = this._completions?.[itemIndex];
     const objectName = this._buildHintObjectName(
       hint.displayText,
-      completionData
+      completionData,
     );
     // Render the actual completion item first
     this._renderCompletionItem(objectName, element);
@@ -736,7 +736,7 @@ export class PlaygroundCodeEditor extends LitElement {
         this._renderCompletionItemWithDetails(
           objectName,
           detailResult,
-          element
+          element,
         );
         // Set the current onSelectedChange to a callback to re-render
         // the currently selected element, but without the details. This is
@@ -751,7 +751,7 @@ export class PlaygroundCodeEditor extends LitElement {
 
   private _renderCompletionItem(
     objectName: string | TemplateResult,
-    target: HTMLElement
+    target: HTMLElement,
   ) {
     render(html`<span class="hint-object-name">${objectName}</span>`, target);
   }
@@ -759,12 +759,12 @@ export class PlaygroundCodeEditor extends LitElement {
   private _renderCompletionItemWithDetails(
     objectName: DirectiveResult,
     details: EditorCompletionDetails,
-    target: HTMLElement
+    target: HTMLElement,
   ) {
     render(
       html`<span class="hint-object-name">${objectName}</span>
         <span class="hint-object-details">${details.text}</span> `,
-      target
+      target,
     );
   }
 
@@ -775,7 +775,7 @@ export class PlaygroundCodeEditor extends LitElement {
    */
   private _buildHintObjectName(
     objectName: string | undefined,
-    completionData: EditorCompletion | undefined
+    completionData: EditorCompletion | undefined,
   ): TemplateResult | string {
     const markedObjectName = objectName ?? '';
     const matches = completionData?.matches ?? [];
@@ -984,7 +984,7 @@ export class PlaygroundCodeEditor extends LitElement {
         if (this._diagnosticsMouseoverListenerActive) {
           this._cmDom?.removeEventListener(
             'mouseover',
-            this._onMouseOverWithDiagnostics
+            this._onMouseOverWithDiagnostics,
           );
           this._diagnosticsMouseoverListenerActive = false;
         }
@@ -993,7 +993,7 @@ export class PlaygroundCodeEditor extends LitElement {
       if (!this._diagnosticsMouseoverListenerActive) {
         this._cmDom?.addEventListener(
           'mouseover',
-          this._onMouseOverWithDiagnostics
+          this._onMouseOverWithDiagnostics,
         );
         this._diagnosticsMouseoverListenerActive = true;
       }
@@ -1011,8 +1011,8 @@ export class PlaygroundCodeEditor extends LitElement {
             },
             {
               className: `diagnostic diagnostic-${i}`,
-            }
-          )
+            },
+          ),
         );
       }
     });
@@ -1029,7 +1029,7 @@ export class PlaygroundCodeEditor extends LitElement {
     // encoded the diagnostic index into a class, we can just extract it
     // directly from the target.
     const idxMatch = (event.target as Element).className?.match(
-      /diagnostic-(\d+)/
+      /diagnostic-(\d+)/,
     );
     if (idxMatch === null) {
       this._tooltipDiagnostic = undefined;
diff --git a/src/playground-file-editor.ts b/src/playground-file-editor.ts
index e587c02c..23de34dc 100644
--- a/src/playground-file-editor.ts
+++ b/src/playground-file-editor.ts
@@ -108,23 +108,23 @@ export class PlaygroundFileEditor extends PlaygroundConnectedElement {
       if (oldProject) {
         oldProject.removeEventListener(
           'filesChanged',
-          this._onProjectFilesChanged
+          this._onProjectFilesChanged,
         );
         oldProject.removeEventListener('compileDone', this._onCompileDone);
         oldProject.removeEventListener(
           'diagnosticsChanged',
-          this._onDiagnosticsChanged
+          this._onDiagnosticsChanged,
         );
       }
       if (this._project) {
         this._project.addEventListener(
           'filesChanged',
-          this._onProjectFilesChanged
+          this._onProjectFilesChanged,
         );
         this._project.addEventListener('compileDone', this._onCompileDone);
         this._project.addEventListener(
           'diagnosticsChanged',
-          this._onDiagnosticsChanged
+          this._onDiagnosticsChanged,
         );
       }
       this._onProjectFilesChanged();
@@ -152,7 +152,7 @@ export class PlaygroundFileEditor extends PlaygroundConnectedElement {
               .readonly=${this.readonly || !this._currentFile}
               .pragmas=${this.pragmas}
               .diagnostics=${this._project?.diagnostics?.get(
-                this._currentFile?.name ?? ''
+                this._currentFile?.name ?? '',
               )}
               .noCompletions=${this.noCompletions}
               @change=${this._onEdit}
@@ -193,9 +193,8 @@ export class PlaygroundFileEditor extends PlaygroundConnectedElement {
   private async _onRequestCompletions(e: CustomEvent) {
     const codeEditorChangeData = e.detail as CodeEditorChangeData;
     codeEditorChangeData.fileName = this.filename ?? '';
-    const completions = await this._project?.getCompletions(
-      codeEditorChangeData
-    );
+    const completions =
+      await this._project?.getCompletions(codeEditorChangeData);
     if (completions) {
       codeEditorChangeData.provideCompletions(completions);
     }
diff --git a/src/playground-file-system-controls.ts b/src/playground-file-system-controls.ts
index 8ba3b453..900373e2 100644
--- a/src/playground-file-system-controls.ts
+++ b/src/playground-file-system-controls.ts
@@ -306,7 +306,7 @@ export class PlaygroundFileSystemControls extends PlaygroundConnectedElement {
       this.dispatchEvent(
         new CustomEvent<{filename: string}>('newFile', {
           detail: {filename},
-        })
+        }),
       );
     }
   }
diff --git a/src/playground-ide.ts b/src/playground-ide.ts
index b8275c1c..67c3f7ca 100644
--- a/src/playground-ide.ts
+++ b/src/playground-ide.ts
@@ -381,7 +381,7 @@ export class PlaygroundIde extends LitElement {
     const onPointermove = (event: PointerEvent) => {
       const rhsWidth = Math.min(
         rhsMaxWidth,
-        Math.max(rhsMinWidth, hostRight - event.clientX)
+        Math.max(rhsMinWidth, hostRight - event.clientX),
       );
       const percent = (rhsWidth / hostWidth) * 100;
       rhsStyle.setProperty('--playground-preview-width', `${percent}%`);
diff --git a/src/playground-project.ts b/src/playground-project.ts
index 66d079f5..eec9f107 100644
--- a/src/playground-project.ts
+++ b/src/playground-project.ts
@@ -114,7 +114,7 @@ export class PlaygroundProject extends LitElement {
             ...file,
             name: undefined,
           },
-        ])
+        ]),
       ),
       importMap: this._validImportMap,
     };
@@ -221,7 +221,7 @@ export class PlaygroundProject extends LitElement {
       } else {
         this._modified = !playgroundFilesDeepEqual(
           this._files,
-          this._pristineFiles
+          this._pristineFiles,
         );
       }
     }
@@ -284,7 +284,7 @@ export class PlaygroundProject extends LitElement {
     // TODO (justinfagnani): lookup URL to show from project config
     const indexUrl = new URL(
       `${endWithSlash(this.sandboxScope)}${this._sessionId}/`,
-      this._normalizedSandboxBaseUrl
+      this._normalizedSandboxBaseUrl,
     );
     return indexUrl.href;
   }
@@ -296,7 +296,7 @@ export class PlaygroundProject extends LitElement {
     // ?queryParams.
     return new URL(
       `playground-service-worker-proxy.html#playground-session-id=${this._sessionId}`,
-      this._normalizedSandboxBaseUrl
+      this._normalizedSandboxBaseUrl,
     ).href;
   }
 
@@ -331,7 +331,7 @@ export class PlaygroundProject extends LitElement {
         {
           const {files, importMap} = await expandProjectConfig(
             source.config,
-            document.baseURI
+            document.baseURI,
           );
           // Note the source could have changed while fetching, hence the
           // double-check here.
@@ -349,7 +349,7 @@ export class PlaygroundProject extends LitElement {
       case 'url':
         {
           const {files, importMap} = await fetchProjectConfig(
-            new URL(source.url, document.baseURI).href
+            new URL(source.url, document.baseURI).href,
           );
           // Note the source could have changed while fetching, hence the
           // double-check here.
@@ -443,7 +443,7 @@ export class PlaygroundProject extends LitElement {
 
   override async firstUpdated() {
     const typescriptWorkerScriptUrl = forceSkypackRawMode(
-      new URL('./playground-typescript-worker.js', import.meta.url)
+      new URL('./playground-typescript-worker.js', import.meta.url),
     );
     let worker: Worker;
     if (typescriptWorkerScriptUrl.origin === window.location.origin) {
@@ -455,7 +455,7 @@ export class PlaygroundProject extends LitElement {
       const resp = await fetch(typescriptWorkerScriptUrl.href);
       const text = await resp.text();
       const blobUrl = URL.createObjectURL(
-        new Blob([text], {type: 'application/javascript'})
+        new Blob([text], {type: 'application/javascript'}),
       );
       worker = new Worker(blobUrl);
       URL.revokeObjectURL(blobUrl);
@@ -474,7 +474,7 @@ export class PlaygroundProject extends LitElement {
         if (event.data.type === CONNECT_PROJECT_TO_SW) {
           this._onNewServiceWorkerPort(event.data.port);
         }
-      }
+      },
     );
     port1.start();
     this._postMessageToServiceWorkerProxyIframe(
@@ -483,7 +483,7 @@ export class PlaygroundProject extends LitElement {
         scope: this.sandboxScope,
         port: port2,
       },
-      [port2]
+      [port2],
     );
   }
 
@@ -497,7 +497,7 @@ export class PlaygroundProject extends LitElement {
             proxy({
               getFile: (name: string) => this._getFile(name),
             }),
-            this._sessionId
+            this._sessionId,
           );
         } else {
           // Version mismatch. Request the service worker be updated
@@ -506,7 +506,7 @@ export class PlaygroundProject extends LitElement {
           console.info(
             `Playground service worker is outdated. ` +
               `Want ${serviceWorkerHash} but got ${e.data.version}. ` +
-              `Waiting for update.`
+              `Waiting for update.`,
           );
           this._postMessageToServiceWorkerProxyIframe({
             type: UPDATE_SERVICE_WORKER,
@@ -520,7 +520,7 @@ export class PlaygroundProject extends LitElement {
 
   private _postMessageToServiceWorkerProxyIframe(
     message: PlaygroundMessage,
-    transfer?: Transferable[]
+    transfer?: Transferable[],
   ) {
     // This iframe exists to proxy messages between this project and the service
     // worker, because the service worker may be running on a different origin
@@ -529,7 +529,7 @@ export class PlaygroundProject extends LitElement {
     if (!iframeWindow) {
       throw new Error(
         'Unexpected internal error: ' +
-          '<playground-project> service worker proxy iframe had no contentWindow'
+          '<playground-project> service worker proxy iframe had no contentWindow',
       );
     }
     // We could constrain targetOrigin to
@@ -566,7 +566,7 @@ export class PlaygroundProject extends LitElement {
     void workerApi.compileProject(
       this._files ?? [],
       {importMap: this._importMap},
-      proxy((result) => build.onOutput(result))
+      proxy((result) => build.onOutput(result)),
     );
     await build.stateChange;
     if (build.state() !== 'done') {
@@ -588,7 +588,7 @@ export class PlaygroundProject extends LitElement {
         changeData.fileContent,
         tokenUnderCursorAsString,
         changeData.cursorIndex,
-        {importMap: this._importMap}
+        {importMap: this._importMap},
       );
       if (completionInfo) {
         const getCompletionDetailsFunction =
@@ -599,7 +599,7 @@ export class PlaygroundProject extends LitElement {
           completionInfo,
           changeData.fileName,
           changeData.cursorIndex,
-          getCompletionDetailsFunction
+          getCompletionDetailsFunction,
         );
       }
     }
@@ -614,12 +614,12 @@ export class PlaygroundProject extends LitElement {
     if (skipFuzzySearch) {
       completions = completionEntriesAsEditorCompletions(
         this._completionInfo?.entries,
-        changeData.tokenUnderCursor
+        changeData.tokenUnderCursor,
       );
     } else {
       completions = sortCompletionItems(
         this._completionInfo?.entries,
-        tokenUnderCursorAsString
+        tokenUnderCursorAsString,
       );
     }
     // We want to pre-fetch the first completion item, if it's present
@@ -634,14 +634,14 @@ export class PlaygroundProject extends LitElement {
   private async _getCompletionDetails(
     filename: string,
     cursorIndex: number,
-    completionWord: string
+    completionWord: string,
   ) {
     const workerApi = await this._deferredTypeScriptWorkerApi.promise;
     const completionItemDetails = await workerApi.getCompletionItemDetails(
       filename,
       cursorIndex,
       {importMap: this._importMap},
-      completionWord
+      completionWord,
     );
 
     return completionItemDetails;
@@ -747,14 +747,14 @@ export class PlaygroundProject extends LitElement {
 const fetchProjectConfig = async (
   url: string,
   alreadyFetchedFilenames = new Set<string>(),
-  alreadyFetchedConfigUrls = new Set<string>()
+  alreadyFetchedConfigUrls = new Set<string>(),
 ): Promise<{files: Array<SampleFile>; importMap: ModuleImportMap}> => {
   if (alreadyFetchedConfigUrls.has(url)) {
     throw new Error(
       `Circular project config extends: ${[
         ...alreadyFetchedConfigUrls.values(),
         url,
-      ].join(' extends ')}`
+      ].join(' extends ')}`,
     );
   }
   alreadyFetchedConfigUrls.add(url);
@@ -763,7 +763,7 @@ const fetchProjectConfig = async (
     throw new Error(
       `Error ${
         resp.status
-      } fetching project config from ${url}: ${await resp.text()}`
+      } fetching project config from ${url}: ${await resp.text()}`,
     );
   }
   let config: Partial<ProjectManifest>;
@@ -771,14 +771,14 @@ const fetchProjectConfig = async (
     config = await resp.json();
   } catch (e) {
     throw new Error(
-      `Error parsing project config JSON from ${url}: ${(e as Error).message}`
+      `Error parsing project config JSON from ${url}: ${(e as Error).message}`,
     );
   }
   return await expandProjectConfig(
     config,
     url,
     alreadyFetchedFilenames,
-    alreadyFetchedConfigUrls
+    alreadyFetchedConfigUrls,
   );
 };
 
@@ -790,7 +790,7 @@ const expandProjectConfig = async (
   config: ProjectManifest,
   baseUrl: string,
   alreadyFetchedFilenames = new Set<string>(),
-  alreadyFetchedConfigUrls = new Set<string>()
+  alreadyFetchedConfigUrls = new Set<string>(),
 ): Promise<{files: Array<SampleFile>; importMap: ModuleImportMap}> => {
   const filePromises: Array<Promise<SampleFile>> = [];
   for (const [filename, info] of Object.entries(config.files ?? {})) {
@@ -811,7 +811,7 @@ const expandProjectConfig = async (
             contentType:
               resp.headers.get('Content-Type')?.toLowerCase() ?? 'text/plain',
           };
-        })()
+        })(),
       );
     } else {
       filePromises.push(
@@ -820,7 +820,7 @@ const expandProjectConfig = async (
           name: filename,
           content: info.content ?? '',
           contentType: typeFromFilename(filename) ?? 'text/plain',
-        })
+        }),
       );
     }
   }
@@ -830,7 +830,7 @@ const expandProjectConfig = async (
     ? fetchProjectConfig(
         new URL(config.extends, baseUrl).href,
         alreadyFetchedFilenames,
-        alreadyFetchedConfigUrls
+        alreadyFetchedConfigUrls,
       )
     : undefined;
 
@@ -919,7 +919,7 @@ const validateImportMap = (importMap: unknown): string[] => {
   if (typeof importMap !== 'object' || importMap === null) {
     errors.push(
       `Import map is invalid because it must be an object,` +
-        ` but it was ${importMap === null ? 'null' : typeof importMap}.`
+        ` but it was ${importMap === null ? 'null' : typeof importMap}.`,
     );
     return errors;
   }
@@ -928,7 +928,7 @@ const validateImportMap = (importMap: unknown): string[] => {
   if (invalidKeys.length > 0) {
     errors.push(
       `Invalid import map properties: ${[...invalidKeys].join(', ')}.` +
-        ` Only "imports" are currently supported.`
+        ` Only "imports" are currently supported.`,
     );
   }
   const imports = (importMap as {imports: unknown}).imports;
@@ -940,7 +940,7 @@ const validateImportMap = (importMap: unknown): string[] => {
     errors.push(
       `Import map "imports" property is invalid` +
         ` because it must be an object,` +
-        ` but it was ${imports === null ? 'null' : typeof imports}.`
+        ` but it was ${imports === null ? 'null' : typeof imports}.`,
     );
     return errors;
   }
@@ -950,14 +950,14 @@ const validateImportMap = (importMap: unknown): string[] => {
       errors.push(
         `Import map key "${specifierKey}" is invalid because` +
           ` address must be a string, but was` +
-          ` ${resolutionResult === null ? 'null' : typeof resolutionResult}`
+          ` ${resolutionResult === null ? 'null' : typeof resolutionResult}`,
       );
       continue;
     }
     if (specifierKey.endsWith('/') && !resolutionResult.endsWith('/')) {
       errors.push(
         `Import map key "${specifierKey}" is invalid because` +
-          ` address "${resolutionResult}" must end in a forward-slash.`
+          ` address "${resolutionResult}" must end in a forward-slash.`,
       );
     }
     try {
@@ -965,7 +965,7 @@ const validateImportMap = (importMap: unknown): string[] => {
     } catch {
       errors.push(
         `Import map key "${specifierKey}" is invalid because` +
-          ` address "${resolutionResult}" is not a valid URL.`
+          ` address "${resolutionResult}" is not a valid URL.`,
       );
     }
   }
@@ -1002,7 +1002,7 @@ const outdent = (str: string): string => {
  */
 const playgroundFilesDeepEqual = (
   filesA: SampleFile[],
-  filesB: SampleFile[]
+  filesB: SampleFile[],
 ): boolean => {
   if (filesA.length !== filesB.length) {
     return false;
diff --git a/src/playground-service-worker-proxy.ts b/src/playground-service-worker-proxy.ts
index 05f2aa93..e968f541 100644
--- a/src/playground-service-worker-proxy.ts
+++ b/src/playground-service-worker-proxy.ts
@@ -21,7 +21,7 @@ void (async () => {
     parent.window.console.warn(
       'Playground sandbox is executing with the same origin as its parent.',
       'This is a security risk.',
-      'https://github.com/google/playground-elements#sandbox-security'
+      'https://github.com/google/playground-elements#sandbox-security',
     );
     // eslint-disable-next-line no-empty
   } catch {}
@@ -44,7 +44,7 @@ void (async () => {
 
   const registration = await navigator.serviceWorker.register(
     new URL('playground-service-worker.js', import.meta.url).href,
-    {scope}
+    {scope},
   );
 
   /** https://www.w3.org/TR/service-workers/#get-newest-worker-algorithm */
@@ -68,7 +68,7 @@ void (async () => {
             aborter.abort();
           }
         },
-        {signal: aborter.signal}
+        {signal: aborter.signal},
       );
     });
   };
@@ -140,7 +140,7 @@ void (async () => {
         // what we must do.
         void connectToNewest(true);
       }
-    }
+    },
   );
 
   // A message from the project.
@@ -167,6 +167,6 @@ void (async () => {
           console.error('Playground service worker update failed.');
         }
       }
-    }
+    },
   );
 })();
diff --git a/src/playground-tab-bar.ts b/src/playground-tab-bar.ts
index 7aeb07d7..0cc43f96 100644
--- a/src/playground-tab-bar.ts
+++ b/src/playground-tab-bar.ts
@@ -142,14 +142,14 @@ export class PlaygroundTabBar extends PlaygroundConnectedElement {
       if (oldProject) {
         oldProject.removeEventListener(
           'filesChanged',
-          this._onProjectFilesChanged
+          this._onProjectFilesChanged,
         );
       }
       if (this._project) {
         this._handleFilesChanged(true);
         this._project.addEventListener(
           'filesChanged',
-          this._onProjectFilesChanged
+          this._onProjectFilesChanged,
         );
       }
     }
@@ -192,7 +192,7 @@ export class PlaygroundTabBar extends PlaygroundConnectedElement {
                     </svg>
                   </mwc-icon-button>`
                 : nothing}
-            </playground-internal-tab>`
+            </playground-internal-tab>`,
         )}
       </playground-internal-tab-bar>
 
@@ -232,7 +232,7 @@ export class PlaygroundTabBar extends PlaygroundConnectedElement {
   private _handleFilesChanged(newProjectLoaded = false) {
     if (newProjectLoaded) {
       const fileToSelect = this._visibleFiles.find(
-        (file) => file.selected
+        (file) => file.selected,
       )?.name;
       if (fileToSelect !== undefined) {
         this._activeFileName = fileToSelect;
@@ -246,7 +246,7 @@ export class PlaygroundTabBar extends PlaygroundConnectedElement {
     event: CustomEvent<{
       tab?: PlaygroundInternalTab;
       previous?: PlaygroundInternalTab;
-    }>
+    }>,
   ) {
     const tab = event.detail.tab;
     if (!tab) {
@@ -261,7 +261,7 @@ export class PlaygroundTabBar extends PlaygroundConnectedElement {
   }
 
   private _onOpenMenu(
-    event: CustomEvent<{index: number; anchor: HTMLElement}>
+    event: CustomEvent<{index: number; anchor: HTMLElement}>,
   ) {
     const controls = this._fileSystemControls;
     if (!controls) {
@@ -312,7 +312,7 @@ export class PlaygroundTabBar extends PlaygroundConnectedElement {
     // might have changed.
     if (this._activeFileName) {
       const index = this._visibleFiles.findIndex(
-        (file) => file.name === this._activeFileName
+        (file) => file.name === this._activeFileName,
       );
       if (index >= 0) {
         this._activeFileIndex = index;
diff --git a/src/service-worker/playground-service-worker.ts b/src/service-worker/playground-service-worker.ts
index 0d47c9b9..fe29ab13 100755
--- a/src/service-worker/playground-service-worker.ts
+++ b/src/service-worker/playground-service-worker.ts
@@ -43,7 +43,7 @@ const workerAPI: ServiceWorkerAPI = {
 };
 
 const findSessionProxyClient = async (
-  sessionId: string
+  sessionId: string,
 ): Promise<Client | undefined> => {
   for (const client of await self.clients.matchAll({
     includeUncontrolled: true,
@@ -161,7 +161,7 @@ const onActivate = (event: ExtendableEvent) => {
 };
 
 const onMessage = (
-  e: Omit<ExtendableMessageEvent, 'data'> & {data: PlaygroundMessage}
+  e: Omit<ExtendableMessageEvent, 'data'> & {data: PlaygroundMessage},
 ) => {
   // Receive a handshake message from a page and setup Comlink.
   if (e.data.type === CONNECT_SW_TO_PROJECT) {
diff --git a/src/shared/completion-utils.ts b/src/shared/completion-utils.ts
index 8ebe3d0e..45c9cc54 100644
--- a/src/shared/completion-utils.ts
+++ b/src/shared/completion-utils.ts
@@ -16,7 +16,7 @@ import {
 
 export function sortCompletionItems(
   completions: CompletionEntryWithDetails[] | undefined,
-  searchWord: string
+  searchWord: string,
 ): EditorCompletion[] {
   if (!completions) return [];
   // If the user input a letter or a partial word, we want to offer
@@ -50,7 +50,7 @@ export function sortCompletionItems(
           get details() {
             return item.item.details;
           },
-        } as EditorCompletion)
+        }) as EditorCompletion,
     )
     // Sort the completions by how well they matched the given keyword
     .sort((a, b) => {
@@ -65,7 +65,7 @@ export function sortCompletionItems(
 
 export function completionEntriesAsEditorCompletions(
   completions: CompletionEntryWithDetails[] | undefined,
-  prefix = ''
+  prefix = '',
 ): EditorCompletion[] {
   return (
     completions?.map(
@@ -82,7 +82,7 @@ export function completionEntriesAsEditorCompletions(
           get details() {
             return comp.details;
           },
-        } as EditorCompletion)
+        }) as EditorCompletion,
     ) ?? []
   );
 }
@@ -100,8 +100,8 @@ export function populateCompletionInfoWithDetailGetters(
   getCompletionDetailsFunction: (
     filename: string,
     cursorIndex: number,
-    completionWord: string
-  ) => Promise<EditorCompletionDetails>
+    completionWord: string,
+  ) => Promise<EditorCompletionDetails>,
 ) {
   const completionInfoWithDetails = completionInfo as CompletionInfoWithDetails;
   completionInfoWithDetails.entries = completionInfo?.entries.map(
@@ -118,12 +118,12 @@ export function populateCompletionInfoWithDetailGetters(
             this._details = getCompletionDetailsFunction(
               filename,
               cursorIndex,
-              entry.name
+              entry.name,
             );
           }
           return this._details;
         },
-      } as CompletionEntryWithDetails)
+      }) as CompletionEntryWithDetails,
   );
   return completionInfoWithDetails;
 }
diff --git a/src/shared/util.ts b/src/shared/util.ts
index 2ed6aab3..5d59cf74 100644
--- a/src/shared/util.ts
+++ b/src/shared/util.ts
@@ -19,7 +19,7 @@ export const forceSkypackRawMode = (url: URL): URL => {
   if (url.hostname === 'cdn.skypack.dev') {
     url.pathname = url.pathname.replace(
       /mode=imports\/(un)?optimized/,
-      'mode=raw'
+      'mode=raw',
     );
   }
   return url;
diff --git a/src/shared/worker-api.ts b/src/shared/worker-api.ts
index 0291110e..1cebbe45 100755
--- a/src/shared/worker-api.ts
+++ b/src/shared/worker-api.ts
@@ -125,20 +125,20 @@ export interface WorkerAPI {
   compileProject(
     files: Array<SampleFile>,
     config: WorkerConfig,
-    emit: (result: BuildOutput) => void
+    emit: (result: BuildOutput) => void,
   ): Promise<void>;
   getCompletions(
     filename: string,
     fileContent: string,
     tokenUnderCursor: string,
     cursorIndex: number,
-    config: WorkerConfig
+    config: WorkerConfig,
   ): Promise<WithMetadata<CompletionInfo> | undefined>;
   getCompletionItemDetails(
     filename: string,
     cursorIndex: number,
     config: WorkerConfig,
-    completionWord: string
+    completionWord: string,
   ): Promise<EditorCompletionDetails>;
 }
 
diff --git a/src/test/completions_test.ts b/src/test/completions_test.ts
index ea1badd7..fda48950 100644
--- a/src/test/completions_test.ts
+++ b/src/test/completions_test.ts
@@ -34,7 +34,7 @@ suite('completions', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('');
 
@@ -75,7 +75,7 @@ suite('completions', () => {
     const iframe = (await pierce(
       'playground-ide',
       'playground-preview',
-      'iframe'
+      'iframe',
     )) as HTMLIFrameElement;
     await waitForIframeLoad(iframe);
     // TODO(aomarks) Chromium and Webkit both fire iframe "load" after the
@@ -95,7 +95,7 @@ suite('completions', () => {
 
   const waitForElement = (
     parent: ParentNode | null | undefined,
-    elementName: string
+    elementName: string,
   ) => {
     return new Promise((resolve, reject) => {
       (function tryToFindElem(attempt) {
@@ -139,8 +139,8 @@ suite('completions', () => {
   const addedNodesContainsCompletionsMenu = (mutationsList: MutationRecord[]) =>
     mutationsList.some((mut) =>
       Array.from(mut.addedNodes).some((node) =>
-        (node as Element).classList.contains('CodeMirror-hints')
-      )
+        (node as Element).classList.contains('CodeMirror-hints'),
+      ),
     );
   const raf = async () => new Promise((r) => requestAnimationFrame(r));
   const pierce = async (...selectors: string[]) => {
@@ -162,7 +162,7 @@ suite('completions', () => {
         async () => {
           resolve('');
         },
-        {once: true}
+        {once: true},
       );
     });
 
@@ -182,7 +182,7 @@ suite('completions', () => {
       console.log('Invalid completions: ');
       for (const listItem of completionItemList?.children || []) {
         console.log(
-          listItem?.querySelector<HTMLElement>('.hint-object-name')?.innerText
+          listItem?.querySelector<HTMLElement>('.hint-object-name')?.innerText,
         );
       }
     }
@@ -191,7 +191,7 @@ suite('completions', () => {
     assert.equal(
       completionItemList?.children.length,
       7,
-      'Completion item list length'
+      'Completion item list length',
     );
   });
 
@@ -206,17 +206,17 @@ suite('completions', () => {
     });
     await waitForElement(
       editor?.shadowRoot,
-      '.CodeMirror-hint-active#cm-complete-0-1'
+      '.CodeMirror-hint-active#cm-complete-0-1',
     );
 
     const activeHint = editor?.shadowRoot?.querySelector(
-      '.CodeMirror-hint-active'
+      '.CodeMirror-hint-active',
     );
 
     assert.equal(
       activeHint?.id,
       'cm-complete-0-1',
-      'Active hint should have the ID cm-complete-0-1 marking the second hint'
+      'Active hint should have the ID cm-complete-0-1 marking the second hint',
     );
   });
 
@@ -243,14 +243,14 @@ suite('completions', () => {
     assert.equal(
       editor?.value,
       'document.querySelector',
-      'Completion should be visible in the code editor'
+      'Completion should be visible in the code editor',
     );
 
     const completionItemList =
       editor?.shadowRoot?.querySelector('.CodeMirror-hints');
     assert.isNull(
       completionItemList,
-      'Completion item list should disappear on completion confirmation'
+      'Completion item list should disappear on completion confirmation',
     );
   });
 
@@ -273,7 +273,7 @@ suite('completions', () => {
     assert.equal(
       completionItemText,
       'reallySpecificFunctionName',
-      'Completion item should be the created function'
+      'Completion item should be the created function',
     );
   });
 });
diff --git a/src/test/fake-cdn-plugin.ts b/src/test/fake-cdn-plugin.ts
index e213ecd1..281110d1 100644
--- a/src/test/fake-cdn-plugin.ts
+++ b/src/test/fake-cdn-plugin.ts
@@ -129,7 +129,7 @@ export function fakeCdnPlugin(): TestRunnerPlugin {
       }
       if (path === '') {
         const packageJson = JSON.parse(
-          versionData.files['package.json']?.content ?? '{}'
+          versionData.files['package.json']?.content ?? '{}',
         ) as {main?: string};
         // Only look at the "main" field, not "module", because that's how
         // unpkg.com works when it's not in ?module mode, which is how we're
@@ -146,8 +146,8 @@ export function fakeCdnPlugin(): TestRunnerPlugin {
         ctx.response.type = path.endsWith('.js')
           ? 'text/javascript'
           : path.endsWith('.json')
-          ? 'application/json'
-          : 'text/plain';
+            ? 'application/json'
+            : 'text/plain';
         return undefined;
       }
       if (path === 'package.json') {
@@ -185,7 +185,7 @@ export type CdnData = {
 };
 
 const parseNpmModuleSpecifier = (
-  specifier: string
+  specifier: string,
 ): {pkg: string; semverRangeOrTag: string; path: string} | undefined => {
   const match = specifier.match(/^((?:@[^/@]+\/)?[^/@]+)(?:@([^/]+))?\/?(.*)$/);
   if (match === null) {
diff --git a/src/test/node-module-resolver_test.ts b/src/test/node-module-resolver_test.ts
index 446f1ee1..aeaa451d 100644
--- a/src/test/node-module-resolver_test.ts
+++ b/src/test/node-module-resolver_test.ts
@@ -25,7 +25,7 @@ suite('NodeModuleResolver', () => {
     const actual = resolver.resolve(
       {pkg: 'mydep', version: '1.2.3', path},
       packageJson,
-      './my-element.js'
+      './my-element.js',
     );
     assert.equal(actual, expected);
   };
diff --git a/src/test/node-modules-layout-maker_test.ts b/src/test/node-modules-layout-maker_test.ts
index 71d74628..23662ca9 100644
--- a/src/test/node-modules-layout-maker_test.ts
+++ b/src/test/node-modules-layout-maker_test.ts
@@ -16,7 +16,7 @@ suite('NodeModulesLayoutMaker', () => {
   const checkLayout = (
     rootDeps: PackageDependencies,
     depGraph: DependencyGraph,
-    expected: NodeModulesDirectory
+    expected: NodeModulesDirectory,
   ) => {
     const layoutMaker = new NodeModulesLayoutMaker();
     const actual = layoutMaker.layout(rootDeps, depGraph);
diff --git a/src/test/playground-code-editor_test.ts b/src/test/playground-code-editor_test.ts
index 271383e2..3ff41a64 100644
--- a/src/test/playground-code-editor_test.ts
+++ b/src/test/playground-code-editor_test.ts
@@ -26,7 +26,7 @@ suite('playground-code-editor', () => {
   test('is registered', () => {
     assert.instanceOf(
       document.createElement('playground-code-editor'),
-      PlaygroundCodeEditor
+      PlaygroundCodeEditor,
     );
   });
 
@@ -110,7 +110,7 @@ suite('playground-code-editor', () => {
       await raf();
       assert.equal(
         editorInternals._codemirror!.getValue(),
-        'value with no cache'
+        'value with no cache',
       );
     });
 
@@ -154,7 +154,7 @@ suite('playground-code-editor', () => {
       await raf();
       assert.equal(
         editorInternals._codemirror!.getValue(),
-        'override document key 1'
+        'override document key 1',
       );
       editorInternals._codemirror?.undo();
       await raf();
@@ -249,7 +249,7 @@ suite('playground-code-editor', () => {
       type: PlaygroundCodeEditor['type'],
       value: string,
       text: string,
-      color: string
+      color: string,
     ) => {
       const editor = document.createElement('playground-code-editor');
       editor.type = type;
@@ -288,7 +288,7 @@ suite('playground-code-editor', () => {
         'tsx',
         'const x: () => unknown = () => <p>foo</p>;',
         'p',
-        tagColor
+        tagColor,
       ));
 
     test('html-in-js', async () =>
@@ -311,7 +311,7 @@ suite('playground-code-editor', () => {
     async function assertToggle(
       type: PlaygroundCodeEditor['type'],
       value: string,
-      expect: string
+      expect: string,
     ) {
       const editor = document.createElement('playground-code-editor');
       editor.type = type;
@@ -385,7 +385,7 @@ suite('playground-code-editor', () => {
       assert.include(
         // There isn't a focusContainer when the editor is in readonly mode.
         editor.shadowRoot!.querySelector<HTMLDivElement>('div')!.innerText,
-        'const g = 3;'
+        'const g = 3;',
       );
     });
   });
diff --git a/src/test/playground-ide_test.ts b/src/test/playground-ide_test.ts
index 1950c8b3..4f52aa6c 100644
--- a/src/test/playground-ide_test.ts
+++ b/src/test/playground-ide_test.ts
@@ -59,7 +59,7 @@ suite('playground-ide', () => {
   // https://modern-web.dev/docs/test-runner/commands/#send-keys
   const updateCurrentFile = async (
     editor: PlaygroundCodeEditor,
-    newValue: string
+    newValue: string,
   ) => {
     const codemirror = (
       editor as unknown as {
@@ -78,7 +78,7 @@ suite('playground-ide', () => {
     const iframe = (await pierce(
       'playground-ide',
       'playground-preview',
-      'iframe'
+      'iframe',
     )) as HTMLIFrameElement;
     await waitForIframeLoad(iframe);
     // TODO(aomarks) Chromium and Webkit both fire iframe "load" after the
@@ -101,13 +101,13 @@ suite('playground-ide', () => {
     const tabBar = await pierce('playground-ide', 'playground-tab-bar');
     while (testRunning) {
       const selectedTab = tabBar.shadowRoot!.querySelector(
-        'playground-internal-tab[active]'
+        'playground-internal-tab[active]',
       );
       if (selectedTab) {
         assert.include(
           selectedTab.textContent?.trim(),
           filename,
-          `Selected tab did not contain '${filename}')`
+          `Selected tab did not contain '${filename}')`,
         );
         break;
       }
@@ -125,7 +125,7 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello HTML');
   });
@@ -140,13 +140,13 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
 
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const editorInternals = editor as unknown as {
       _codemirror: PlaygroundCodeEditor['_codemirror'];
@@ -156,11 +156,11 @@ suite('playground-ide', () => {
 
     assert.include(
       editorInternals._codemirror?.getValue(),
-      `<script>console.log('hello');</script>`
+      `<script>console.log('hello');</script>`,
     );
     assert.include(
       editorInternals._codemirror?.getValue(),
-      `<script>console.log('potato');</script>`
+      `<script>console.log('potato');</script>`,
     );
   });
 
@@ -178,7 +178,7 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello JS');
   });
@@ -198,7 +198,7 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello TS');
   });
@@ -346,19 +346,19 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello HTML 1');
 
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     updateCurrentFile(editor, 'Hello HTML 2');
     const project = (await pierce(
       'playground-ide',
-      'playground-project'
+      'playground-project',
     )) as PlaygroundProject;
     // Note we shouldn't await the save(), because assertPreviewContains waits
     // for an iframe load event, and we can legitimately get an iframe load
@@ -382,7 +382,7 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello JS');
     const tabBar = await pierce('playground-ide', 'playground-tab-bar');
@@ -404,7 +404,7 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello JS');
     const tabBar = await pierce('playground-ide', 'playground-tab-bar');
@@ -444,19 +444,19 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
 
     const codemirrorContainer = editor.shadowRoot!.querySelector(
-      '.CodeMirror'
+      '.CodeMirror',
     ) as HTMLElement;
     const codeMirrorLongLine = editor.shadowRoot!.querySelectorAll(
-      '.CodeMirror-line'
+      '.CodeMirror-line',
     )[1] as HTMLElement;
 
     assert.include(
       Array.from(codemirrorContainer?.classList),
-      'CodeMirror-wrap'
+      'CodeMirror-wrap',
     );
 
     assert.include(codeMirrorLongLine.style.paddingLeft, '4px');
@@ -482,19 +482,19 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
 
     const codemirrorContainer = editor.shadowRoot!.querySelector(
-      '.CodeMirror'
+      '.CodeMirror',
     ) as HTMLElement;
     const codeMirrorLongLine = editor.shadowRoot!.querySelectorAll(
-      '.CodeMirror-line'
+      '.CodeMirror-line',
     )[1] as HTMLElement;
 
     assert.include(
       Array.from(codemirrorContainer?.classList),
-      'CodeMirror-wrap'
+      'CodeMirror-wrap',
     );
 
     assert.include(codeMirrorLongLine.style.paddingLeft, '0.7em');
@@ -519,7 +519,7 @@ suite('playground-ide', () => {
       'playground-ide',
       'playground-file-editor',
       'playground-code-editor',
-      '.CodeMirror-code'
+      '.CodeMirror-code',
     );
 
     assert.equal(cmCode.getAttribute('contenteditable'), 'true');
@@ -542,7 +542,7 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
 
     const queryHiddenLineNumbers = () =>
@@ -588,13 +588,13 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const focusContainer = editor.shadowRoot!.querySelector(
-      '#focusContainer'
+      '#focusContainer',
     ) as HTMLElement;
     const editableRegion = editor.shadowRoot!.querySelector(
-      '.CodeMirror-code'
+      '.CodeMirror-code',
     ) as HTMLElement;
     const keyboardHelp = 'Press Enter';
 
@@ -615,7 +615,7 @@ suite('playground-ide', () => {
 
     // Press Escape to stop editing
     editableRegion.dispatchEvent(
-      new KeyboardEvent('keydown', {key: 'Escape', bubbles: true})
+      new KeyboardEvent('keydown', {key: 'Escape', bubbles: true}),
     );
     await raf();
     assert.isTrue(focusContainer.matches(':focus'));
@@ -663,7 +663,7 @@ suite('playground-ide', () => {
     container.appendChild(ide);
     const project = (await pierce(
       'playground-ide',
-      'playground-project'
+      'playground-project',
     )) as PlaygroundProject;
     // Need to defer another microtask for the config to initialize.
     await new Promise((resolve) => requestAnimationFrame(resolve));
@@ -682,7 +682,7 @@ suite('playground-ide', () => {
     project.addFile('package.json');
     assert.isFalse(project.isValidNewFilename('package.json'));
     const packageJson = project.files?.find(
-      (file) => file.name === 'package.json'
+      (file) => file.name === 'package.json',
     );
     assert.isFalse(packageJson?.hidden);
     assert.equal(packageJson?.content, '{"dependencies":{}}');
@@ -702,13 +702,13 @@ suite('playground-ide', () => {
 
     const project = (await pierce(
       'playground-ide',
-      'playground-project'
+      'playground-project',
     )) as PlaygroundProject;
 
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
 
     const editorInternals = editor as unknown as {
@@ -777,7 +777,7 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
 
     const codeToAdd = `console.log("Foo");
@@ -812,7 +812,7 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
 
     await new Promise((resolve) => window.requestAnimationFrame(resolve));
@@ -839,7 +839,7 @@ suite('playground-ide', () => {
       // NOTE: For some reason, the parent window's history only seems to be
       // affected when the iframe origin is different.
       const separateOrigin = (await executeServerCommand(
-        'separate-origin'
+        'separate-origin',
       )) as string;
 
       render(
@@ -852,32 +852,32 @@ suite('playground-ide', () => {
             </script>
           </playground-ide>
         `,
-        container
+        container,
       );
       const iframe = (await pierce(
         'playground-ide',
         'playground-preview',
-        'iframe'
+        'iframe',
       )) as HTMLIFrameElement;
       await waitForIframeLoad(iframe);
 
       const editor = (await pierce(
         'playground-ide',
         'playground-file-editor',
-        'playground-code-editor'
+        'playground-code-editor',
       )) as PlaygroundCodeEditor;
       updateCurrentFile(editor, 'Hello HTML 2');
 
       const project = (await pierce(
         'playground-ide',
-        'playground-project'
+        'playground-project',
       )) as PlaygroundProject;
       project.save();
       await waitForIframeLoad(iframe);
 
       const historyLengthAfter = window.history.length;
       assert.equal(historyLengthAfter, historyLengthBefore);
-    }
+    },
   );
 
   test('reloading preview does not create a new iframe element', async () => {
@@ -891,12 +891,12 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
 
     const preview = (await pierce(
       'playground-ide',
-      'playground-preview'
+      'playground-preview',
     )) as PlaygroundPreview;
 
     const iframe = preview.iframe!;
@@ -906,13 +906,13 @@ suite('playground-ide', () => {
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     updateCurrentFile(editor, 'Hello HTML 2');
 
     const project = (await pierce(
       'playground-ide',
-      'playground-project'
+      'playground-project',
     )) as PlaygroundProject;
 
     await Promise.all([waitForIframeLoad(iframe), project.save()]);
@@ -920,7 +920,7 @@ suite('playground-ide', () => {
     const newIframe = (await pierce(
       'playground-ide',
       'playground-preview',
-      'iframe'
+      'iframe',
     )) as HTMLIFrameElement;
 
     assert.equal(newIframe, iframe);
@@ -937,13 +937,13 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     await assertPreviewContains('Hello HTML');
 
     const project = (await pierce(
       'playground-ide',
-      'playground-project'
+      'playground-project',
     )) as PlaygroundProject;
     assert.lengthOf(project.files ?? [], 1);
 
@@ -952,7 +952,7 @@ suite('playground-ide', () => {
     const menuButtonSvg = await pierce(
       'playground-ide',
       'playground-tab-bar',
-      '.menu-button > svg'
+      '.menu-button > svg',
     );
     menuButtonSvg.dispatchEvent(new Event('click', {bubbles: true}));
 
@@ -960,7 +960,7 @@ suite('playground-ide', () => {
       'playground-ide',
       'playground-tab-bar',
       'playground-file-system-controls',
-      '#deleteButton'
+      '#deleteButton',
     );
     deleteButton.click();
 
@@ -1003,19 +1003,19 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const codemirror = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const codemirrorInternals = codemirror as unknown as {
       _codemirror: PlaygroundCodeEditor['_codemirror'];
     };
     await assertPreviewContains('Hello JS');
     codemirrorInternals._codemirror!.setValue(
-      "document.body.textContent = 'Hello 2'"
+      "document.body.textContent = 'Hello 2'",
     );
     await assertPreviewContains('Hello 2');
     codemirrorInternals._codemirror!.undo();
@@ -1039,17 +1039,17 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const fileEditor = (await pierce(
       'playground-ide',
-      'playground-file-editor'
+      'playground-file-editor',
     )) as PlaygroundFileEditor;
 
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const editorInternals = editor as unknown as {
       _codemirror: PlaygroundCodeEditor['_codemirror'];
@@ -1083,17 +1083,17 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const fileEditor = (await pierce(
       'playground-ide',
-      'playground-file-editor'
+      'playground-file-editor',
     )) as PlaygroundFileEditor;
 
     const editor = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const editorInternals = editor as unknown as {
       _codemirror: PlaygroundCodeEditor['_codemirror'];
@@ -1104,14 +1104,14 @@ suite('playground-ide', () => {
     assert.equal(editorInternals._codemirror!.getValue().trim(), JS_CONTENT);
 
     editorInternals._codemirror!.setValue(
-      "document.body.textContent = 'Hello 2'"
+      "document.body.textContent = 'Hello 2'",
     );
 
     fileEditor.filename = 'index.html';
     await raf();
     assert.include(
       editorInternals._codemirror!.getValue().trim(),
-      `<script type="module" src="hello.js">`
+      `<script type="module" src="hello.js">`,
     );
     editorInternals._codemirror!.setValue(`<body>
     <script type="module" src="hello.js">&lt;/script>
@@ -1142,11 +1142,11 @@ suite('playground-ide', () => {
     editorInternals._codemirror!.undo();
     await raf();
     assert.isFalse(
-      editorInternals._codemirror!.getValue().includes(`<p>Add this</p>`)
+      editorInternals._codemirror!.getValue().includes(`<p>Add this</p>`),
     );
     assert.include(
       editorInternals._codemirror!.getValue(),
-      `<script type="module" src="hello.js">`
+      `<script type="module" src="hello.js">`,
     );
   });
 
@@ -1164,16 +1164,16 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const project = (await pierce(
       'playground-ide',
-      'playground-project'
+      'playground-project',
     )) as PlaygroundProject;
     const codemirror = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const codemirrorInternals = codemirror as unknown as {
       _codemirror: PlaygroundCodeEditor['_codemirror'];
@@ -1181,7 +1181,7 @@ suite('playground-ide', () => {
     await raf();
     assert.include(codemirrorInternals._codemirror!.getValue(), 'Hello JS');
     codemirrorInternals._codemirror!.setValue(
-      "document.body.textContent = 'Hello 2'"
+      "document.body.textContent = 'Hello 2'",
     );
     project.renameFile('hello.js', 'potato.js');
     await raf();
@@ -1212,40 +1212,40 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const EXPECTED_FOLDED = "…console.log('potato');";
     const fileEditor = (await pierce(
       'playground-ide',
-      'playground-file-editor'
+      'playground-file-editor',
     )) as PlaygroundFileEditor;
     const codemirror = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      EXPECTED_FOLDED
+      EXPECTED_FOLDED,
     );
     fileEditor.filename = 'index.html';
     await raf();
     assert.include(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      `src="hello.js"></script>`
+      `src="hello.js"></script>`,
     );
     fileEditor.filename = 'hello.js';
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      EXPECTED_FOLDED
+      EXPECTED_FOLDED,
     );
   });
 
@@ -1269,40 +1269,40 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const EXPECTED_FOLDED = "…console.log('potato');";
     const fileEditor = (await pierce(
       'playground-ide',
-      'playground-file-editor'
+      'playground-file-editor',
     )) as PlaygroundFileEditor;
     const codemirror = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      EXPECTED_FOLDED
+      EXPECTED_FOLDED,
     );
     fileEditor.filename = 'index.html';
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      '<body>…</body>'
+      '<body>…</body>',
     );
     fileEditor.filename = 'hello.js';
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      EXPECTED_FOLDED
+      EXPECTED_FOLDED,
     );
   });
 
@@ -1324,13 +1324,13 @@ suite('playground-ide', () => {
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const EXPECTED_FOLDED = "…console.log('potato');";
     const codemirror = (await pierce(
       'playground-ide',
       'playground-file-editor',
-      'playground-code-editor'
+      'playground-code-editor',
     )) as PlaygroundCodeEditor;
     const codemirrorInternals = codemirror as unknown as {
       _codemirror: PlaygroundCodeEditor['_codemirror'];
@@ -1338,9 +1338,9 @@ suite('playground-ide', () => {
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      EXPECTED_FOLDED
+      EXPECTED_FOLDED,
     );
     codemirror.value = `/* playground-fold */
 document.body.textContent = 'Hello JS';
@@ -1350,9 +1350,9 @@ console.log('tomato');`;
     await raf();
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      "…console.log('tomato');"
+      "…console.log('tomato');",
     );
 
     codemirrorInternals._codemirror?.undo();
@@ -1360,9 +1360,9 @@ console.log('tomato');`;
 
     assert.equal(
       innerTextWithoutSpaces(
-        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*')
+        codemirror?.shadowRoot?.querySelector<HTMLDivElement>('*'),
       ),
-      EXPECTED_FOLDED
+      EXPECTED_FOLDED,
     );
   });
 
@@ -1435,7 +1435,7 @@ console.log('tomato');`;
           </script>
         </playground-ide>
       `,
-      container
+      container,
     );
     const ide = container.firstElementChild as PlaygroundIde;
     await assertTabSelected('a.html');
@@ -1453,7 +1453,7 @@ console.log('tomato');`;
           B
         </script>
       `,
-      ide
+      ide,
     );
     await assertTabSelected('b.html');
     // Nothing selected; should stay on b.html
@@ -1469,7 +1469,7 @@ console.log('tomato');`;
           B
         </script>
       `,
-      ide
+      ide,
     );
     await assertTabSelected('b.html');
   });
diff --git a/src/test/playwright/service-worker.spec.ts b/src/test/playwright/service-worker.spec.ts
index 1f074c5e..19791f7d 100644
--- a/src/test/playwright/service-worker.spec.ts
+++ b/src/test/playwright/service-worker.spec.ts
@@ -87,7 +87,7 @@ test.describe('service worker', () => {
     if (versionMatches.length !== 1) {
       throw new Error(
         'Expected 1 version string in playground-service-worker.js. ' +
-          `Found ${versionMatches.length}.`
+          `Found ${versionMatches.length}.`,
       );
     }
     const hex = versionMatches[0].groups?.['hex'];
@@ -169,7 +169,7 @@ test.describe('service worker', () => {
 
   const expectIframeServesVersion = async (
     page: Page,
-    version: string
+    version: string,
   ): Promise<void> => {
     const text = await getIframeBodyText(page);
     expect(text).toEqual(`${version} index.html`);
@@ -186,7 +186,7 @@ test.describe('service worker', () => {
         if (text === expect) {
           resolve();
         }
-      })
+      }),
     );
 
   test('simple fresh load', async ({browser}) => {
@@ -276,7 +276,7 @@ test.describe('service worker', () => {
     setExpectedVersion('new');
     const loggedAboutUpdate = expectConsoleLog(
       page,
-      'Playground service worker is outdated. Want new but got old. Waiting for update.'
+      'Playground service worker is outdated. Want new but got old. Waiting for update.',
     );
     await page.goto(indexUrl);
     await oldServedAndNewSwappedIn;
diff --git a/src/test/types-fetcher_test.ts b/src/test/types-fetcher_test.ts
index 24d42e9c..e132c053 100644
--- a/src/test/types-fetcher_test.ts
+++ b/src/test/types-fetcher_test.ts
@@ -44,7 +44,7 @@ const checkTypesFetcher = async (opts: {
 
 const checkTypesFetcherImpl = async (
   opts: Parameters<typeof checkTypesFetcher>[0],
-  cdnBaseUrl: string
+  cdnBaseUrl: string,
 ) => {
   const cdn = new CachingCdn(cdnBaseUrl);
   const importMapResolver = new ImportMapResolver(opts.importMap ?? {});
@@ -53,7 +53,7 @@ const checkTypesFetcherImpl = async (
     importMapResolver,
     opts.packageJson,
     opts.sourceTexts,
-    opts.tsLibs ?? []
+    opts.tsLibs ?? [],
   );
   if (opts.expectedDependencyGraph !== undefined) {
     assert.deepEqual(actual.dependencyGraph, opts.expectedDependencyGraph);
@@ -65,7 +65,7 @@ const checkTypesFetcherImpl = async (
   // "{}" as the difference in the error message, hence this conversion :(
   assert.deepEqual(
     [...actual.files].sort(([keyA], [keyB]) => keyA.localeCompare(keyB)),
-    [...opts.expectedFiles].sort(([keyA], [keyB]) => keyA.localeCompare(keyB))
+    [...opts.expectedFiles].sort(([keyA], [keyB]) => keyA.localeCompare(keyB)),
   );
 };
 
@@ -932,7 +932,7 @@ suite('types fetcher', () => {
           importMap,
           expectedFiles,
         },
-        cdnBaseUrl
+        cdnBaseUrl,
       );
     } finally {
       await deleteCdnData();
@@ -981,7 +981,7 @@ suite('types fetcher', () => {
           importMap,
           expectedFiles,
         },
-        cdnBaseUrl
+        cdnBaseUrl,
       );
     } finally {
       await deleteCdnData();
@@ -1039,7 +1039,7 @@ suite('types fetcher', () => {
           importMap,
           expectedFiles,
         },
-        cdnBaseUrl
+        cdnBaseUrl,
       );
     } finally {
       await deleteCdnData();
diff --git a/src/test/util_test.ts b/src/test/util_test.ts
index b03f6302..083e6932 100644
--- a/src/test/util_test.ts
+++ b/src/test/util_test.ts
@@ -51,14 +51,14 @@ suite('MergedAsyncIterables', () => {
     merged.add(
       (async function* () {
         yield 'a';
-      })()
+      })(),
     );
     await flush(merged);
     assert.throws(() => {
       merged.add(
         (async function* () {
           yield 'b';
-        })()
+        })(),
       );
     });
   });
@@ -126,11 +126,11 @@ suite('MergedAsyncIterables', () => {
           merged.add(
             (async function* () {
               yield 'c0';
-            })()
+            })(),
           );
           await raf();
           yield 'b1';
-        })()
+        })(),
       );
       yield 'a1';
     })();
@@ -147,7 +147,7 @@ suite('MergedAsyncIterables', () => {
       (async function* () {
         await raf();
         yield 'slow';
-      })()
+      })(),
     );
 
     // The key thing about this test is that we've started iterating before
@@ -162,7 +162,7 @@ suite('MergedAsyncIterables', () => {
     merged.add(
       (async function* () {
         yield 'fast';
-      })()
+      })(),
     );
 
     await done;
diff --git a/src/test/worker-test-util.ts b/src/test/worker-test-util.ts
index 79c7ed7d..07a82ccb 100644
--- a/src/test/worker-test-util.ts
+++ b/src/test/worker-test-util.ts
@@ -16,11 +16,11 @@ import {
 import {CdnData} from './fake-cdn-plugin.js';
 
 export const configureFakeCdn = async (
-  data: CdnData
+  data: CdnData,
 ): Promise<{cdnBaseUrl: string; deleteCdnData: () => Promise<void>}> => {
   const {cdnBaseUrl, id} = (await executeServerCommand(
     'set-fake-cdn-data',
-    data
+    data,
   )) as {cdnBaseUrl: string; id: number};
   const deleteCdnData = async () => {
     await executeServerCommand('delete-fake-cdn-data', id);
@@ -35,7 +35,7 @@ export const checkTransform = async (
   files: SampleFile[],
   expected: BuildOutput[],
   importMap: ModuleImportMap = {},
-  cdnData: CdnData = {}
+  cdnData: CdnData = {},
 ) => {
   const {cdnBaseUrl, deleteCdnData} = await configureFakeCdn(cdnData);
   try {
@@ -60,7 +60,7 @@ export const checkTransform = async (
         while (result.diagnostic.message.includes(cdnBaseUrl)) {
           result.diagnostic.message = result.diagnostic.message.replace(
             cdnBaseUrl,
-            '<CDN-BASE-URL>/'
+            '<CDN-BASE-URL>/',
           );
         }
       }
@@ -68,7 +68,7 @@ export const checkTransform = async (
 
     assert.deepEqual(
       results.sort(sortBuildOutput),
-      expected.sort(sortBuildOutput)
+      expected.sort(sortBuildOutput),
     );
   } finally {
     await deleteCdnData();
diff --git a/src/typescript-worker/bare-module-transformer.ts b/src/typescript-worker/bare-module-transformer.ts
index 2efe4195..b8276c87 100644
--- a/src/typescript-worker/bare-module-transformer.ts
+++ b/src/typescript-worker/bare-module-transformer.ts
@@ -63,7 +63,7 @@ export class BareModuleTransformer {
   }
 
   async *process(
-    results: AsyncIterable<BuildOutput> | Iterable<BuildOutput>
+    results: AsyncIterable<BuildOutput> | Iterable<BuildOutput>,
   ): AsyncIterable<BuildOutput> {
     // This "output" iterable helps us emit all build outputs as soon as they
     // are available as we asynchronously walk the dependency tree.
@@ -77,7 +77,7 @@ export class BareModuleTransformer {
    */
   private async *_handleProjectFiles(
     results: AsyncIterable<BuildOutput> | Iterable<BuildOutput>,
-    output: MergedAsyncIterables<BuildOutput>
+    output: MergedAsyncIterables<BuildOutput>,
   ): AsyncIterable<BuildOutput> {
     // The project might contain a package.json, which will determine our
     // top-level version constraints. Resolve it lazily.
@@ -115,7 +115,7 @@ export class BareModuleTransformer {
   private async *_handleModule(
     file: FileBuildOutput,
     getPackageJson: () => Promise<PackageJson | undefined>,
-    output: MergedAsyncIterables<BuildOutput>
+    output: MergedAsyncIterables<BuildOutput>,
   ): AsyncIterable<BuildOutput> {
     let js = file.file.content;
     let specifiers;
@@ -126,7 +126,7 @@ export class BareModuleTransformer {
       yield file;
       const diagnostic = makeEsModuleLexerDiagnostic(
         e as Error,
-        file.file.name
+        file.file.name,
       );
       if (diagnostic !== undefined) {
         yield diagnostic;
@@ -149,7 +149,7 @@ export class BareModuleTransformer {
           oldSpecifier,
           file.file.name,
           getPackageJson,
-          output
+          output,
         ),
       });
     }
@@ -199,7 +199,7 @@ export class BareModuleTransformer {
     specifier: string,
     referrer: string,
     getPackageJson: () => Promise<PackageJson | undefined>,
-    output: MergedAsyncIterables<BuildOutput>
+    output: MergedAsyncIterables<BuildOutput>,
   ): Promise<string> {
     const fromImportMap = this._importMapResolver.resolve(specifier);
     if (fromImportMap !== null) {
@@ -214,7 +214,7 @@ export class BareModuleTransformer {
         specifier,
         referrer,
         getPackageJson,
-        output
+        output,
       );
     }
     // Anything else is a relative specifier.
@@ -243,7 +243,7 @@ export class BareModuleTransformer {
         // wouldn't want to pass this scope's `getPackageJson`, because it would
         // be the wrong one.
         async () => undefined,
-        output
+        output,
       );
     }
     // This relative specifier is good as-is, since it has an extension. We just
@@ -264,7 +264,7 @@ export class BareModuleTransformer {
     specifier: string,
     referrer: string,
     getPackageJson: () => Promise<PackageJson | undefined>,
-    output: MergedAsyncIterables<BuildOutput>
+    output: MergedAsyncIterables<BuildOutput>,
   ): Promise<string> {
     let location = parseNpmStyleSpecifier(specifier);
     if (location === undefined) {
@@ -302,7 +302,7 @@ export class BareModuleTransformer {
    */
   private async *_fetchExternalDependency(
     location: NpmFileLocation,
-    output: MergedAsyncIterables<BuildOutput>
+    output: MergedAsyncIterables<BuildOutput>,
   ) {
     const path = `${location.pkg}@${location.version}/${location.path}`;
     if (this._emittedExternalDependencies.has(path)) {
@@ -345,7 +345,7 @@ export class BareModuleTransformer {
         },
       },
       getPackageJson,
-      output
+      output,
     );
   }
 }
@@ -355,7 +355,7 @@ export class BareModuleTransformer {
  */
 const makeEsModuleLexerDiagnostic = (
   e: Error,
-  filename: string
+  filename: string,
 ): DiagnosticBuildOutput | undefined => {
   const match = e.message.match(/@:(\d+):(\d+)$/);
   if (match === null) {
@@ -381,7 +381,7 @@ const makeEsModuleLexerDiagnostic = (
  */
 const makeJsonParseDiagnostic = (
   e: Error,
-  file: SampleFile
+  file: SampleFile,
 ): DiagnosticBuildOutput => {
   const start = extractPositionFromJsonParseError(e.message, file.content) ?? {
     line: 0,
@@ -409,7 +409,7 @@ const makeJsonParseDiagnostic = (
  */
 const extractPositionFromJsonParseError = (
   message: string,
-  json: string
+  json: string,
 ): {line: number; character: number} | undefined => {
   const chrome = message.match(/at position (\d+)/);
   if (chrome !== null) {
diff --git a/src/typescript-worker/build.ts b/src/typescript-worker/build.ts
index 00fd1191..1dee5ea4 100644
--- a/src/typescript-worker/build.ts
+++ b/src/typescript-worker/build.ts
@@ -13,19 +13,19 @@ import {processTypeScriptFiles} from './typescript-builder.js';
 export const build = async (
   files: Array<SampleFile>,
   config: WorkerConfig,
-  emit: (result: BuildOutput) => void
+  emit: (result: BuildOutput) => void,
 ): Promise<void> => {
   const workerContext = getWorkerContext(config);
   const bareModuleBuilder = new BareModuleTransformer(
     workerContext.cdn,
-    workerContext.importMapResolver
+    workerContext.importMapResolver,
   );
 
   const results = bareModuleBuilder.process(
     processTypeScriptFiles(
       workerContext,
-      files.map((file) => ({kind: 'file', file}))
-    )
+      files.map((file) => ({kind: 'file', file})),
+    ),
   );
   for await (const result of results) {
     emit(result);
diff --git a/src/typescript-worker/caching-cdn.ts b/src/typescript-worker/caching-cdn.ts
index a579f9be..42ecb169 100644
--- a/src/typescript-worker/caching-cdn.ts
+++ b/src/typescript-worker/caching-cdn.ts
@@ -121,7 +121,7 @@ export class CachingCdn {
   }
 
   private async _fetch(
-    location: NpmFileLocation
+    location: NpmFileLocation,
   ): Promise<{url: string; file: CdnFile}> {
     let exact = isExactSemverVersion(location.version);
     if (!exact) {
@@ -147,7 +147,7 @@ export class CachingCdn {
     const content = await res.text();
     if (res.status !== 200) {
       const err = new Error(
-        `CDN HTTP ${res.status} error (${url}): ${content}`
+        `CDN HTTP ${res.status} error (${url}): ${content}`,
       );
       deferred.reject(err);
       return deferred.promise;
diff --git a/src/typescript-worker/completions.ts b/src/typescript-worker/completions.ts
index 0d30348b..9c589935 100644
--- a/src/typescript-worker/completions.ts
+++ b/src/typescript-worker/completions.ts
@@ -22,7 +22,7 @@ export const queryCompletions = async (
   fileContent: string,
   tokenUnderCursor: string,
   cursorIndex: number,
-  config: WorkerConfig
+  config: WorkerConfig,
 ): Promise<WithMetadata<CompletionInfo> | undefined> => {
   const workerContext = getWorkerContext(config);
 
@@ -46,7 +46,7 @@ export const queryCompletions = async (
   const completions = languageService.getCompletionsAtPosition(
     filename,
     cursorIndex,
-    options
+    options,
   );
 
   return completions;
@@ -63,7 +63,7 @@ export const getCompletionItemDetails = async (
   filename: string,
   cursorIndex: number,
   config: WorkerConfig,
-  completionWord: string
+  completionWord: string,
 ): Promise<EditorCompletionDetails> => {
   const workerContext = getWorkerContext(config);
   const languageService = workerContext.languageServiceContext.service;
@@ -77,7 +77,7 @@ export const getCompletionItemDetails = async (
     undefined,
     undefined,
     undefined,
-    undefined
+    undefined,
   );
 
   const detailInformation: EditorCompletionDetails = {
@@ -89,7 +89,7 @@ export const getCompletionItemDetails = async (
 };
 
 function displayPartsToString(
-  displayParts: SymbolDisplayPart[] | undefined
+  displayParts: SymbolDisplayPart[] | undefined,
 ): string {
   if (!displayParts || displayParts.length === 0) return '';
 
@@ -101,7 +101,7 @@ function displayPartsToString(
 }
 
 function getDocumentations(
-  documentation: SymbolDisplayPart[] | undefined
+  documentation: SymbolDisplayPart[] | undefined,
 ): string[] {
   return documentation?.map((doc) => doc.text) ?? [];
 }
diff --git a/src/typescript-worker/diagnostic.ts b/src/typescript-worker/diagnostic.ts
index 40b09518..ed98135f 100644
--- a/src/typescript-worker/diagnostic.ts
+++ b/src/typescript-worker/diagnostic.ts
@@ -27,7 +27,7 @@ export function makeLspDiagnostic(tsDiagnostic: ts.Diagnostic): lsp.Diagnostic {
         tsDiagnostic.start !== undefined &&
         tsDiagnostic.length !== undefined
           ? tsDiagnostic.file.getLineAndCharacterOfPosition(
-              tsDiagnostic.start + tsDiagnostic.length
+              tsDiagnostic.start + tsDiagnostic.length,
             )
           : {character: 0, line: 0},
     },
diff --git a/src/typescript-worker/import-map-resolver.ts b/src/typescript-worker/import-map-resolver.ts
index e33aca93..65d40b91 100644
--- a/src/typescript-worker/import-map-resolver.ts
+++ b/src/typescript-worker/import-map-resolver.ts
@@ -23,7 +23,7 @@ export class ImportMapResolver {
 
   resolve(specifier: string): string | null {
     for (const [specifierKey, resolutionResult] of Object.entries(
-      this.importMap.imports ?? {}
+      this.importMap.imports ?? {},
     )) {
       // Note that per spec we shouldn't do a lookup for the exact match case,
       // because if a trailing-slash mapping also matches and comes first, it
@@ -37,7 +37,7 @@ export class ImportMapResolver {
           console.warn(
             `Could not resolve module specifier "${specifier}"` +
               ` using import map key "${specifierKey}" because` +
-              ` address "${resolutionResult}" must end in a forward-slash.`
+              ` address "${resolutionResult}" must end in a forward-slash.`,
           );
           return null;
         }
@@ -51,7 +51,7 @@ export class ImportMapResolver {
             `Could not resolve module specifier "${specifier}"` +
               ` using import map key "${specifierKey}" because` +
               ` "${afterPrefix}" could not be parsed` +
-              ` relative to "${resolutionResult}".`
+              ` relative to "${resolutionResult}".`,
           );
           return null;
         }
@@ -61,7 +61,7 @@ export class ImportMapResolver {
           console.warn(
             `Could not resolve module specifier "${specifier}"` +
               ` using import map key "${specifierKey}" because` +
-              ` "${afterPrefix}" backtracked above "${resolutionResult}".`
+              ` "${afterPrefix}" backtracked above "${resolutionResult}".`,
           );
           return null;
         }
diff --git a/src/typescript-worker/language-service-context.ts b/src/typescript-worker/language-service-context.ts
index e907e395..8ac2d78f 100644
--- a/src/typescript-worker/language-service-context.ts
+++ b/src/typescript-worker/language-service-context.ts
@@ -31,12 +31,12 @@ export class LanguageServiceContext {
 
   readonly serviceHost = new WorkerLanguageServiceHost(
     self.origin,
-    compilerOptions
+    compilerOptions,
   );
 
   readonly service = ts.createLanguageService(
     this.serviceHost,
-    ts.createDocumentRegistry()
+    ts.createDocumentRegistry(),
   );
 }
 
@@ -82,7 +82,7 @@ class WorkerLanguageServiceHost implements ts.LanguageServiceHost {
    * */
   sync(files: Map<string, string>) {
     files.forEach((file, fileName) =>
-      this.updateFileContentIfNeeded(fileName, file)
+      this.updateFileContentIfNeeded(fileName, file),
     );
     this._removeDeletedFiles(files);
   }
diff --git a/src/typescript-worker/node-module-resolver.ts b/src/typescript-worker/node-module-resolver.ts
index 890ab264..3ecc4ad2 100644
--- a/src/typescript-worker/node-module-resolver.ts
+++ b/src/typescript-worker/node-module-resolver.ts
@@ -40,7 +40,7 @@ export class NodeModuleResolver {
   resolve(
     location: NpmFileLocation,
     packageJson: PackageJson,
-    base: string
+    base: string,
   ): string {
     const packageSubpath = addRelativePrefix(location.path);
 
@@ -68,11 +68,11 @@ export class NodeModuleResolver {
       packageSubpath,
       packageJson as PackageJsonWithExports,
       base,
-      this._conditions
+      this._conditions,
     );
     if (!resolved.pathname.startsWith(packageBase)) {
       throw new Error(
-        `Unexpected error: ${resolved.pathname} expected to start with ${packageBase}`
+        `Unexpected error: ${resolved.pathname} expected to start with ${packageBase}`,
       );
     }
     return resolved.pathname.slice(packageBase.length);
diff --git a/src/typescript-worker/node-modules-layout-maker.ts b/src/typescript-worker/node-modules-layout-maker.ts
index 2c689379..9ef3758f 100644
--- a/src/typescript-worker/node-modules-layout-maker.ts
+++ b/src/typescript-worker/node-modules-layout-maker.ts
@@ -82,7 +82,7 @@ interface GraphTraversalState {
 export class NodeModulesLayoutMaker {
   layout(
     rootDeps: PackageDependencies,
-    depGraph: DependencyGraph
+    depGraph: DependencyGraph,
   ): NodeModulesDirectory {
     const rootNodeModulesDir: NodeModulesDirectory = {};
     // Traverse the dependency graph using breadth-first search so that we
diff --git a/src/typescript-worker/node/errors.ts b/src/typescript-worker/node/errors.ts
index 09e7c752..c0adc351 100644
--- a/src/typescript-worker/node/errors.ts
+++ b/src/typescript-worker/node/errors.ts
@@ -16,7 +16,7 @@ export class InvalidModuleSpecifierError extends Error {
     super(
       `Invalid module "${request}" ${reason}${
         base ? ` imported from ${base}` : ''
-      }`
+      }`,
     );
   }
 }
@@ -26,7 +26,7 @@ export class InvalidPackageConfigError extends Error {
     super(
       `Invalid package config ${path}${base ? ` while importing ${base}` : ''}${
         message ? `. ${message}` : ''
-      }`
+      }`,
     );
   }
 }
@@ -37,7 +37,7 @@ export class InvalidPackageTargetError extends Error {
     key: string,
     target: PackageExportsTarget,
     isImport = false,
-    base?: string
+    base?: string,
   ) {
     const relError =
       typeof target === 'string' &&
@@ -55,9 +55,9 @@ export class InvalidPackageTargetError extends Error {
       msg = `Invalid "${
         isImport ? 'imports' : 'exports'
       }" target ${JSON.stringify(
-        target
+        target,
       )} defined for '${key}' in the package config ${fileURLToPath(
-        pkgPath
+        pkgPath,
       )}package.json${base ? ` imported from ${base}` : ''}${
         relError ? '; targets must start with "./"' : ''
       }`;
@@ -71,13 +71,13 @@ export class PackagePathNotExportedError extends Error {
       super(
         `No "exports" main defined in ${pkgPath}package.json${
           base ? ` imported from ${base}` : ''
-        }`
+        }`,
       );
     } else {
       super(
         `Package subpath '${subpath}' is not defined by "exports" in ${pkgPath}package.json${
           base ? ` imported from ${base}` : ''
-        }`
+        }`,
       );
     }
   }
diff --git a/src/typescript-worker/node/resolve.ts b/src/typescript-worker/node/resolve.ts
index 7fd946e9..b380386a 100644
--- a/src/typescript-worker/node/resolve.ts
+++ b/src/typescript-worker/node/resolve.ts
@@ -26,7 +26,7 @@ function emitFolderMapDeprecation(
   match: string,
   pjsonUrl: URL,
   isExports: boolean,
-  base: string
+  base: string,
 ): void {
   const pjsonPath = fileURLToPath(pjsonUrl);
   console.warn(
@@ -37,19 +37,19 @@ function emitFolderMapDeprecation(
     }.\n` +
       `Update this package.json to use a subpath pattern like "${match}*".`,
     'DeprecationWarning',
-    'DEP0148'
+    'DEP0148',
   );
 }
 
 function makeExportsNotFoundError(
   subpath: string,
   packageJSONUrl: URL,
-  base: string
+  base: string,
 ): PackagePathNotExportedError {
   return new PackagePathNotExportedError(
     fileURLToPath(new URL('.', packageJSONUrl)),
     subpath,
-    base
+    base,
   );
 }
 
@@ -57,7 +57,7 @@ function makeInvalidSubpathError(
   subpath: string,
   packageJSONUrl: URL,
   internal: boolean,
-  base: string
+  base: string,
 ) {
   const reason = `request is not a valid subpath for the "${
     internal ? 'imports' : 'exports'
@@ -70,7 +70,7 @@ function makeInvalidPackageTargetError(
   target: PackageExportsTarget,
   packageJSONUrl: URL,
   internal: boolean,
-  base: string
+  base: string,
 ) {
   if (typeof target === 'object' && target !== null) {
     target = JSON.stringify(target, null, '');
@@ -82,7 +82,7 @@ function makeInvalidPackageTargetError(
     subpath,
     target,
     internal,
-    base
+    base,
   );
 }
 
@@ -98,7 +98,7 @@ function resolvePackageTargetString(
   pattern: boolean,
   internal: boolean,
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  _conditions: Set<string>
+  _conditions: Set<string>,
 ): URL {
   if (subpath !== '' && !pattern && target[target.length - 1] !== '/') {
     throw makeInvalidPackageTargetError(
@@ -106,7 +106,7 @@ function resolvePackageTargetString(
       target,
       packageJSONUrl,
       internal,
-      base
+      base,
     );
   }
 
@@ -117,7 +117,7 @@ function resolvePackageTargetString(
       target,
       packageJSONUrl,
       internal,
-      base
+      base,
     );
   }
 
@@ -127,7 +127,7 @@ function resolvePackageTargetString(
       target,
       packageJSONUrl,
       internal,
-      base
+      base,
     );
   }
 
@@ -141,7 +141,7 @@ function resolvePackageTargetString(
       target,
       packageJSONUrl,
       internal,
-      base
+      base,
     );
   }
 
@@ -154,7 +154,7 @@ function resolvePackageTargetString(
       match + subpath,
       packageJSONUrl,
       internal,
-      base
+      base,
     );
   }
 
@@ -180,7 +180,7 @@ function resolvePackageTarget(
   base: string,
   pattern: boolean,
   internal: boolean,
-  conditions: Set<string>
+  conditions: Set<string>,
 ): URL | null | undefined {
   if (typeof target === 'string') {
     return resolvePackageTargetString(
@@ -191,7 +191,7 @@ function resolvePackageTarget(
       base,
       pattern,
       internal,
-      conditions
+      conditions,
     );
   } else if (Array.isArray(target)) {
     if (target.length === 0) {
@@ -211,7 +211,7 @@ function resolvePackageTarget(
           base,
           pattern,
           internal,
-          conditions
+          conditions,
         );
       } catch (e) {
         lastException = e;
@@ -239,7 +239,7 @@ function resolvePackageTarget(
         throw new InvalidPackageConfigError(
           fileURLToPath(packageJSONUrl),
           base,
-          '"exports" cannot contain numeric property keys.'
+          '"exports" cannot contain numeric property keys.',
         );
       }
     }
@@ -255,7 +255,7 @@ function resolvePackageTarget(
           base,
           pattern,
           internal,
-          conditions
+          conditions,
         );
         if (resolved === undefined) continue;
         return resolved;
@@ -270,7 +270,7 @@ function resolvePackageTarget(
     target,
     packageJSONUrl,
     internal,
-    base
+    base,
   );
 }
 
@@ -280,7 +280,7 @@ function isConditionalExportsMainSugar(
   // be able to reference a global called "exports".
   _exports: PackageExports,
   packageJSONUrl: URL,
-  base: string
+  base: string,
 ): boolean {
   if (typeof _exports === 'string' || Array.isArray(_exports)) {
     return true;
@@ -303,7 +303,7 @@ function isConditionalExportsMainSugar(
         base,
         '"exports" cannot contain some keys starting with \'.\' and some not.' +
           ' The exports object must either be an object of package subpath keys' +
-          ' or an object of main entry condition name keys only.'
+          ' or an object of main entry condition name keys only.',
       );
     }
   }
@@ -315,7 +315,7 @@ export function packageExportsResolve(
   packageSubpath: string,
   packageConfig: PackageJsonWithExports,
   base: string,
-  conditions: Set<string>
+  conditions: Set<string>,
 ): URL {
   let _exports = packageConfig.exports;
   if (isConditionalExportsMainSugar(_exports, packageJSONUrl, base)) {
@@ -337,7 +337,7 @@ export function packageExportsResolve(
       base,
       false,
       false,
-      conditions
+      conditions,
     );
     if (resolved === null || resolved === undefined) {
       throw makeExportsNotFoundError(packageSubpath, packageJSONUrl, base);
@@ -363,7 +363,7 @@ export function packageExportsResolve(
         bestMatch = key;
         bestMatchSubpath = packageSubpath.slice(
           patternIndex,
-          packageSubpath.length - patternTrailer.length
+          packageSubpath.length - patternTrailer.length,
         );
       }
     } else if (
@@ -388,7 +388,7 @@ export function packageExportsResolve(
       base,
       pattern,
       false,
-      conditions
+      conditions,
     );
     if (resolved === null || resolved === undefined) {
       throw makeExportsNotFoundError(packageSubpath, packageJSONUrl, base);
diff --git a/src/typescript-worker/types-fetcher.ts b/src/typescript-worker/types-fetcher.ts
index 390881fe..c4657192 100644
--- a/src/typescript-worker/types-fetcher.ts
+++ b/src/typescript-worker/types-fetcher.ts
@@ -72,7 +72,7 @@ export class TypesFetcher {
     importMapResolver: ImportMapResolver,
     rootPackageJson: PackageJson | undefined,
     sources: string[],
-    tsLibs: string[]
+    tsLibs: string[],
   ): Promise<{
     files: Map<FilePath, FileContent>;
     layout: NodeModulesDirectory;
@@ -91,14 +91,14 @@ export class TypesFetcher {
     // especially for non-404 errors.
     await Promise.allSettled([
       ...sources.map((source) =>
-        fetcher._handleBareAndRelativeSpecifiers(source, root)
+        fetcher._handleBareAndRelativeSpecifiers(source, root),
       ),
       ...tsLibs.map((lib) => fetcher._addTypeScriptStandardLib(lib)),
       fetcher._fetchTypesPackages(),
     ]);
     const layout = new NodeModulesLayoutMaker().layout(
       fetcher._rootDependencies,
-      fetcher._dependencyGraph
+      fetcher._dependencyGraph,
     );
     const files = new Map<string, string>();
     await fetcher._materializeNodeModulesTree(layout, files, '');
@@ -117,7 +117,7 @@ export class TypesFetcher {
   private constructor(
     cdn: CachingCdn,
     importMapResolver: ImportMapResolver,
-    rootPackageJson: PackageJson | undefined
+    rootPackageJson: PackageJson | undefined,
   ) {
     this._cdn = cdn;
     this._importMapResolver = importMapResolver;
@@ -133,7 +133,7 @@ export class TypesFetcher {
     }
 
     const typesPackages = Object.keys(
-      this._rootPackageJson.dependencies
+      this._rootPackageJson.dependencies,
     ).filter((k) => k.startsWith('@types/'));
 
     if (typesPackages.length === 0) {
@@ -141,20 +141,20 @@ export class TypesFetcher {
     }
 
     await Promise.allSettled(
-      typesPackages.map((k) => this._handleBareSpecifier(k, root))
+      typesPackages.map((k) => this._handleBareSpecifier(k, root)),
     );
   }
 
   private async _addTypeScriptStandardLib(lib: string): Promise<void> {
     return this._handleBareSpecifier(
       `typescript/lib/lib.${lib.toLowerCase()}.js`,
-      root
+      root,
     );
   }
 
   private async _handleBareAndRelativeSpecifiers(
     sourceText: string,
-    referrer: NpmFileLocation | typeof root
+    referrer: NpmFileLocation | typeof root,
   ): Promise<void> {
     const fileInfo = ts.preProcessFile(sourceText, undefined, true);
     const promises = [];
@@ -177,7 +177,7 @@ export class TypesFetcher {
 
   private async _handleBareSpecifier(
     bare: string,
-    referrer: NpmFileLocation | typeof root
+    referrer: NpmFileLocation | typeof root,
   ): Promise<void> {
     let location = parseNpmStyleSpecifier(bare);
     if (location === undefined) {
@@ -191,7 +191,7 @@ export class TypesFetcher {
     if (!handledByImportMap) {
       location.version = await this._getDependencyVersion(
         referrer,
-        location.pkg
+        location.pkg,
       );
     }
     // Get the ".d.ts" path by changing extension, or looking up the "typings"
@@ -228,7 +228,7 @@ export class TypesFetcher {
 
   private async _handleRelativeSpecifier(
     relative: string,
-    referrer: NpmFileLocation
+    referrer: NpmFileLocation,
   ): Promise<void> {
     const location = {
       // We know package and version must be the same as the referrer, since
@@ -258,7 +258,7 @@ export class TypesFetcher {
 
   private async _getDependencyVersion(
     from: NpmFileLocation | typeof root,
-    to: string
+    to: string,
   ): Promise<string> {
     const packageJson =
       from === root
@@ -271,9 +271,8 @@ export class TypesFetcher {
     if (location.path !== '') {
       return changeFileExtension(location.path, 'd.ts');
     }
-    const packageJson = await this._fetchPackageJsonAndAddToOutputFiles(
-      location
-    );
+    const packageJson =
+      await this._fetchPackageJsonAndAddToOutputFiles(location);
     return (
       packageJson?.typings ??
       packageJson?.types ??
@@ -295,17 +294,17 @@ export class TypesFetcher {
     if (result.error !== undefined) {
       throw new Error(
         `Could not fetch package.json for ` +
-          `${location.pkg}@${location.version}: ${result.error}`
+          `${location.pkg}@${location.version}: ${result.error}`,
       );
     }
     return JSON.parse(result.result) as PackageJson;
   }
 
   private async _fetchAndAddToOutputFiles(
-    location: NpmFileLocation
+    location: NpmFileLocation,
   ): Promise<Result<string, number>> {
     const importMapUrl = this._importMapResolver.resolve(
-      trimTrailingSlash(`${location.pkg}/${location.path}`)
+      trimTrailingSlash(`${location.pkg}/${location.path}`),
     );
     if (importMapUrl === null) {
       location = await this._cdn.canonicalize(location);
@@ -358,7 +357,7 @@ export class TypesFetcher {
    */
   private _addEdgeToDependencyGraph(
     from: {pkg: string; version: string} | typeof root,
-    to: {pkg: string; version: string}
+    to: {pkg: string; version: string},
   ) {
     if (from === root) {
       this._rootDependencies[to.pkg] = to.version;
@@ -402,7 +401,7 @@ export class TypesFetcher {
   private async _materializeNodeModulesTree(
     layout: NodeModulesDirectory,
     fileMap: Map<FilePath, FileContent>,
-    prefix: FilePath
+    prefix: FilePath,
   ): Promise<void> {
     for (const [pkg, entry] of Object.entries(layout)) {
       const files = this._filesByPackageVersion.get(pkg)?.get(entry.version);
@@ -419,7 +418,7 @@ export class TypesFetcher {
       await this._materializeNodeModulesTree(
         entry.nodeModules,
         fileMap,
-        `${prefix}${pkg}/node_modules/`
+        `${prefix}${pkg}/node_modules/`,
       );
     }
   }
diff --git a/src/typescript-worker/typescript-builder.ts b/src/typescript-worker/typescript-builder.ts
index 8041fb04..94989af0 100644
--- a/src/typescript-worker/typescript-builder.ts
+++ b/src/typescript-worker/typescript-builder.ts
@@ -12,7 +12,7 @@ import {WorkerContext} from './worker-context.js';
 
 export async function* processTypeScriptFiles(
   workerContext: WorkerContext,
-  results: AsyncIterable<BuildOutput> | Iterable<BuildOutput>
+  results: AsyncIterable<BuildOutput> | Iterable<BuildOutput>,
 ): AsyncIterable<BuildOutput> {
   // Instantiate langservice variables for ease of access
   const langService = workerContext.languageServiceContext.service;
@@ -66,11 +66,11 @@ export async function* processTypeScriptFiles(
     packageJson === undefined
       ? {type: 'module'}
       : packageJson.type === 'module'
-      ? packageJson
-      : {...packageJson, type: 'module'};
+        ? packageJson
+        : {...packageJson, type: 'module'};
   loadedFiles.set(
     new URL('package.json', self.origin).href,
-    JSON.stringify(defaultPackageJson)
+    JSON.stringify(defaultPackageJson),
   );
 
   // Sync the new loaded files with the servicehost.
@@ -113,7 +113,7 @@ export async function* processTypeScriptFiles(
     workerContext.importMapResolver,
     packageJson,
     inputFiles.map((file) => file.file.content),
-    workerContext.languageServiceContext.compilerOptions.lib
+    workerContext.languageServiceContext.compilerOptions.lib,
   );
   for (const [path, content] of typings.files) {
     // TypeScript is going to look for these files as paths relative to our
diff --git a/src/typescript-worker/util.ts b/src/typescript-worker/util.ts
index d1bc97e1..bac601c4 100644
--- a/src/typescript-worker/util.ts
+++ b/src/typescript-worker/util.ts
@@ -33,7 +33,7 @@ export class MergedAsyncIterables<T> {
   add(iterable: AsyncIterable<T>) {
     if (this._done) {
       throw new Error(
-        'Merged iterator is exhausted. Cannot add new source iterators.'
+        'Merged iterator is exhausted. Cannot add new source iterators.',
       );
     }
     this._numSources++;
@@ -88,7 +88,7 @@ export const resolveUrlPath = (a: string, b: string) =>
  * a fully qualified URL.
  */
 export const classifySpecifier = (
-  specifier: string
+  specifier: string,
 ): 'bare' | 'relative' | 'url' => {
   try {
     // Note a specifier like "te:st.js" would be classified as a URL. This is
@@ -121,7 +121,7 @@ export interface NpmFileLocation {
  * }
  */
 export const parseNpmStyleSpecifier = (
-  specifier: string
+  specifier: string,
 ): NpmFileLocation | undefined => {
   const match = specifier.match(/^((?:@[^/@]+\/)?[^/@]+)(?:@([^/]+))?\/?(.*)$/);
   if (match === null) {
@@ -131,7 +131,7 @@ export const parseNpmStyleSpecifier = (
     unknown,
     string,
     string | undefined,
-    string
+    string,
   ];
   return {pkg, version: version ?? '', path};
 };
@@ -168,7 +168,7 @@ export const changeFileExtension = (path: string, newExt: string): string => {
  */
 export const charToLineAndChar = (
   str: string,
-  char: number
+  char: number,
 ): {line: number; character: number} => {
   let line = 0;
   let character = 0;
@@ -250,7 +250,7 @@ export interface PackageJsonWithExports extends PackageJson {
 export const isExactSemverVersion = (s: string) =>
   s.match(
     // https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
-    /^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/
+    /^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$/,
   ) !== null;
 
 export const pkgVersion = ({pkg, version}: {pkg: string; version: string}) =>