refactor!: convert to TypeScript

.eslintrc.json

@@ -18,7 +18,7 @@
     "sourceType": "module"
   },
   "rules": {
-    "@typescript-eslint/no-explicit-any": "error",
+    "@typescript-eslint/no-explicit-any": "off",
     "@typescript-eslint/no-unused-expressions": "error"
   },
   "settings": {

.gitignore

@@ -60,4 +60,6 @@ typings/
 
 # Built TypeScript files
 lib/*.js
-webpack.config.js
+lib/*.js.map
+editor/**/*.js
+editor/**/*.js.map

.prettierignore

@@ -6,5 +6,5 @@ node_modules
 # This can be removed after https://github.com/googleapis/release-please/issues/1802 is fixed
 CHANGELOG.md
 # TSC output:
-webpack.config.js
 lib/*.js
+editor/js/**/*.js

editor/js/editable-css.js → editor/js/editable-css.ts

@@ -11,20 +11,29 @@ import "../css/editor-libs/common.css";
 import "../css/editable-css.css";
 
 (function () {
-  const exampleChoiceList = document.getElementById("example-choice-list");
-  const exampleChoices = exampleChoiceList.querySelectorAll(".example-choice");
+  const exampleChoiceList = document.getElementById(
+    "example-choice-list",
+  ) as HTMLElement;
+
+  const exampleChoices = exampleChoiceList.querySelectorAll(
+    ".example-choice",
+  ) as NodeListOf<HTMLElement>;
   const exampleDeclarations = Array.from(
     exampleChoices,
-    (choice) => choice.querySelector("code").textContent,
+    (choice) => choice.querySelector("code")?.textContent,
   );
-  const editorWrapper = document.getElementById("editor-wrapper");
-  const output = document.getElementById("output");
-  const warningNoSupport = document.getElementById("warning-no-support");
-
-  const originalChoices = [];
+  const editorWrapper = document.getElementById(
+    "editor-wrapper",
+  ) as HTMLElement;
+  const output = document.getElementById("output") as HTMLElement;
+  const warningNoSupport = document.getElementById(
+    "warning-no-support",
+  ) as HTMLElement;
+
+  const originalChoices: string[] = [];
   let initialChoice = 0;
 
-  function applyCodeMirror(target, code) {
+  function applyCodeMirror(target: HTMLElement, code: string) {
     return initCodeEditor(target, code, languageCSS(), {
       lineNumbers: false,
     });
@@ -42,14 +51,16 @@ import "../css/editable-css.css";
       const exampleChoice = exampleChoices[i];
       const choiceButton = document.createElement("button");
       const choiceButtonText = document.createElement("span");
-      const choiceCode = exampleChoice.querySelector("code");
-      const copyButton = exampleChoice.getElementsByClassName("copy")[0];
+      const choiceCode = exampleChoice.querySelector("code") as HTMLElement;
+      const copyButton = exampleChoice.getElementsByClassName(
+        "copy",
+      )[0] as HTMLButtonElement;
 
-      originalChoices.push(choiceCode.textContent);
+      originalChoices.push(choiceCode.textContent || "");
 
       const codeMirrorEditor = applyCodeMirror(
-        exampleChoice.querySelector("pre"),
-        choiceCode.textContent,
+        exampleChoice.querySelector("pre") as HTMLElement,
+        choiceCode.textContent || "",
       );
 
       choiceButton.setAttribute("type", "button");
@@ -82,11 +93,12 @@ import "../css/editable-css.css";
    * reset all the CSS examples to their original state
    */
   function handleResetEvents() {
-    const resetButton = document.getElementById("reset");
+    const resetButton = document.getElementById("reset") as HTMLElement;
 
     resetButton.addEventListener("click", () => {
       exampleChoices.forEach((e, i) => {
-        const preEl = e.querySelector("pre");
+        const preEl = e.querySelector("pre") as HTMLElement;
+
         // Remove original codemirror
         for (const e of preEl.children) {
           e.remove();
@@ -100,16 +112,16 @@ import "../css/editable-css.css";
 
       // if there is an initial choice set, set it as selected
       if (initialChoice) {
-        mceEvents.onChoose(exampleChoices[initialChoice]);
-        clippy.toggleClippy(exampleChoices[initialChoice]);
+        mceEvents.onChoose(exampleChoices[initialChoice] as HTMLElement);
+        clippy.toggleClippy(exampleChoices[initialChoice] as HTMLElement);
       } else {
-        mceEvents.onChoose(exampleChoices[0]);
-        clippy.toggleClippy(exampleChoices[0]);
+        mceEvents.onChoose(exampleChoices[0] as HTMLElement);
+        clippy.toggleClippy(exampleChoices[0] as HTMLElement);
       }
     });
   }
 
-  function indexOf(exampleChoices, choice) {
+  function indexOf(exampleChoices: NodeListOf<Element>, choice: Element) {
     for (let i = 0, l = exampleChoices.length; i < l; i++) {
       if (exampleChoices[i] === choice) {
         return i;
@@ -126,23 +138,24 @@ import "../css/editable-css.css";
   function handleChoiceHover() {
     for (let i = 0, l = exampleChoices.length; i < l; i++) {
       const choice = exampleChoices[i];
-      const copyBtn = choice.querySelector(".copy");
+      const copyBtn = choice.querySelector(".copy") as HTMLElement;
+
       copyBtn.setAttribute("aria-label", "Copy to clipboard");
 
       choice.addEventListener("mouseover", () => {
-        copyBtn.setAttribute("aria-hidden", false);
+        copyBtn.setAttribute("aria-hidden", "false");
       });
       choice.addEventListener("mouseout", () => {
-        copyBtn.setAttribute("aria-hidden", true);
+        copyBtn.setAttribute("aria-hidden", "true");
       });
     }
   }
 
   /* only show the live code view if JS is enabled and the property is supported. */
   if (cssEditorUtils.isAnyDeclarationSetSupported(exampleDeclarations)) {
     enableLiveEditor();
-    mceEvents.onChoose(exampleChoices[initialChoice]);
-    clippy.toggleClippy(exampleChoices[initialChoice]);
+    mceEvents.onChoose(exampleChoices[initialChoice] as HTMLElement);
+    clippy.toggleClippy(exampleChoices[initialChoice] as HTMLElement);
   } else {
     warningNoSupport.classList.remove("hidden");
   }

editor/js/editable-js.js → editor/js/editable-js.ts

@@ -1,3 +1,4 @@
+import type { EditorView } from "codemirror";
 import * as featureDetector from "./editor-libs/feature-detector.js";
 import mceConsole from "./editor-libs/console.js";
 import * as mceEvents from "./editor-libs/events.js";
@@ -12,35 +13,40 @@ import {
 } from "./editor-libs/codemirror-editor.js";
 
 (function () {
-  const codeBlock = document.getElementById("static-js");
+  const codeBlock = document.getElementById("static-js") as HTMLElement;
+
   const exampleFeature = codeBlock.dataset["feature"];
-  const execute = document.getElementById("execute");
-  const output = document.querySelector("#console code");
-  const reset = document.getElementById("reset");
+  const execute = document.getElementById("execute") as HTMLElement;
+  const output = document.querySelector("#console code") as HTMLElement;
+  const reset = document.getElementById("reset") as HTMLElement;
 
-  let codeMirror;
+  let codeMirror: EditorView | null;
   let staticContainer;
-  let liveContainer = "";
+  let liveContainer;
 
   /**
    * Reads the textContent from the interactiveCodeBlock, sends the
    * textContent to executeLiveExample, and logs the output to the
    * output container
    */
   function applyCode() {
-    const currentValue = getEditorContent(codeMirror);
+    if (!codeMirror) {
+      initCodeMirror();
+      // "as EditorView" on next line needed to trick TypeScript
+    }
+    const currentValue = getEditorContent(codeMirror as EditorView);
     updateOutput(currentValue);
   }
 
   /**
    * Initialize CodeMirror
    */
   function initCodeMirror() {
-    const editorContainer = document.getElementById("editor");
+    const editorContainer = document.getElementById("editor") as HTMLElement;
 
     codeMirror = initCodeEditor(
       editorContainer,
-      codeBlock.textContent,
+      codeBlock.textContent || "",
       languageJavaScript(),
     );
   }
@@ -51,15 +57,15 @@ import {
   function initInteractiveEditor() {
     /* If the `data-height` attribute is defined on the `codeBlock`, set
            the value of this attribute as a class on the editor element. */
-    if (codeBlock.dataset["height"]) {
-      const editor = document.getElementById("editor");
+    if (codeBlock?.dataset["height"]) {
+      const editor = document.getElementById("editor") as HTMLElement;
       editor.classList.add(codeBlock.dataset["height"]);
     }
 
-    staticContainer = document.getElementById("static");
+    staticContainer = document.getElementById("static") as HTMLElement;
     staticContainer.classList.add("hidden");
 
-    liveContainer = document.getElementById("live");
+    liveContainer = document.getElementById("live") as HTMLElement;
     liveContainer.classList.remove("hidden");
 
     mceConsole();
@@ -73,21 +79,22 @@ import {
    * to the output container.
    * @param {String} exampleCode - The code to execute
    */
-  function updateOutput(exampleCode) {
+  function updateOutput(exampleCode: string) {
     output.classList.add("fade-in");
 
     try {
       // Create a new Function from the code, and immediately execute it.
       new Function(exampleCode)();
-    } catch (event) {
-      output.textContent = "Error: " + event.message;
+    } catch (event: unknown) {
+      output.textContent = "Error: " + (event as Error)?.message;
     }
 
     output.addEventListener("animationend", () =>
       output.classList.remove("fade-in"),
     );
   }
 
+  /* only execute code in supported browsers */
   if (featureDetector.isDefined(exampleFeature)) {
     document.documentElement.classList.add("js");
 
@@ -99,5 +106,9 @@ import {
     });
 
     reset.addEventListener("click", () => window.location.reload());
+  } else {
+    console.warn(
+      `Feature ${exampleFeature} is not supported; code editor disabled.`,
+    );
   }
 })();