diff --git a/packages/lwc-language-server/src/javascript/__tests__/compiler.test.ts b/packages/lwc-language-server/src/javascript/__tests__/compiler.test.ts
index 595cc1cf..eb1c1a3f 100644
--- a/packages/lwc-language-server/src/javascript/__tests__/compiler.test.ts
+++ b/packages/lwc-language-server/src/javascript/__tests__/compiler.test.ts
@@ -103,7 +103,7 @@ it('linter returns empty diagnostics on correct file', async () => {
     expect(diagnostics).toEqual([]);
 });
 
-it('transform returns javascript metadata', async () => {
+it('mapLwcMetadataToInternal returns expected javascript metadata', async () => {
     const filepath = path.join('src', 'javascript', '__tests__', 'fixtures', 'metadata.js');
     const content = fs.readFileSync(filepath, 'utf8');
 
@@ -120,8 +120,6 @@ it('transform returns javascript metadata', async () => {
 
     const modernMetadata = collectBundleMetadata(options);
     const metadata = mapLwcMetadataToInternal(modernMetadata.files[0] as ScriptFile);
-
-    // TODO: see if the rest of this works as expected
     const properties = getProperties(metadata);
 
     expect(metadata.doc).toBe('* Foo doc');
diff --git a/packages/lwc-language-server/src/javascript/__tests__/type-mapping.test.ts b/packages/lwc-language-server/src/javascript/__tests__/type-mapping.test.ts
index ac912b9e..36ab1452 100644
--- a/packages/lwc-language-server/src/javascript/__tests__/type-mapping.test.ts
+++ b/packages/lwc-language-server/src/javascript/__tests__/type-mapping.test.ts
@@ -10,7 +10,6 @@ it('can map new metadata to old metadata', async () => {
     const filepath = path.join('src', 'javascript', '__tests__', 'fixtures', 'metadata.js');
     const content = fs.readFileSync(filepath, 'utf8');
 
-    // Work with new metadata.
     const newMetadataOpts: BundleConfig = {
         type: 'internal',
         name: 'metadata',
diff --git a/packages/lwc-language-server/src/javascript/compiler.ts b/packages/lwc-language-server/src/javascript/compiler.ts
index 2a4ef3a4..de1e7dda 100644
--- a/packages/lwc-language-server/src/javascript/compiler.ts
+++ b/packages/lwc-language-server/src/javascript/compiler.ts
@@ -123,11 +123,6 @@ function toDiagnostic(err: any): Diagnostic {
     };
 }
 
-function externalToInternalDiagnostic(ext: CompilerDiagnostic[]): Diagnostic[] {
-    // TODO: do this for real
-    return ext as unknown as Diagnostic[];
-}
-
 export async function compileSource(source: string, fileName = 'foo.js'): Promise<CompilerResult> {
     const name = fileName.substring(0, fileName.lastIndexOf('.'));
 
@@ -142,7 +137,6 @@ export async function compileSource(source: string, fileName = 'foo.js'): Promis
             diagnostics: [toDiagnostic(err)],
         };
     }
-    // TODO: should we do something with transformSync(...).warnings?
 
     const options: BundleConfig = {
         type: 'platform',
@@ -158,7 +152,9 @@ export async function compileSource(source: string, fileName = 'foo.js'): Promis
     };
     const modernMetadata = collectBundleMetadata(options);
     if (modernMetadata?.diagnostics.length) {
-        return { diagnostics: externalToInternalDiagnostic(modernMetadata.diagnostics) };
+        return {
+            diagnostics: modernMetadata.diagnostics.map(toDiagnostic),
+        };
     }
 
     const metadata = mapLwcMetadataToInternal(modernMetadata.files[0] as ScriptFile);