fix(worker)!: remove dead highlight-load-lang code path

tests/spec/core/highlight-spec.js

@@ -11,12 +11,6 @@ import {
 describe("Core — Highlight", () => {
   afterAll(flushIframes);
 
-  it("highlights remote languages not bundled by default with ReSpec", async () => {
-    const doc = await makeRSDoc({}, "spec/core/highlight.html");
-    const span = doc.querySelector("code.testlang span[class*=hljs]");
-    expect(span.textContent).toBe("funkyFunction");
-  });
-
   it("shouldn't highlight idl blocks", async () => {
     const body = `
       <section><pre class=idl>

worker/respec-worker.js

@@ -1,4 +1,4 @@
-// ReSpec Worker v1.0.0
+// ReSpec Worker
 "use strict";
 // hljs is either inlined by core/worker.js (preferred) or loaded below via
 // importScripts as a fallback when the inline fetch was not possible.
@@ -10,44 +10,16 @@ if (typeof self.hljs === "undefined" && self.RESPEC_HIGHLIGHT_URL) {
   }
 }
 
-self.addEventListener("message", ({ data: originalData }) => {
-  const data = Object.assign({}, originalData);
-  switch (data.action) {
-    case "highlight-load-lang": {
-      const { langScript, propName, lang } = data;
-      try {
-        if (!langScript) {
-          throw new Error(`No script content provided for language "${lang}"`);
-        }
-        // importScripts() from blob workers is blocked for cross-origin URLs
-        // (blob worker origin is "null"). Create a same-origin blob URL from
-        // the pre-fetched script content to load the language safely.
-        const blob = new Blob([langScript], { type: "application/javascript" });
-        const objectURL = URL.createObjectURL(blob);
-        try {
-          importScripts(objectURL);
-        } finally {
-          URL.revokeObjectURL(objectURL);
-        }
-        self.hljs.registerLanguage(lang, self[propName]);
-      } catch (err) {
-        console.error("Failed to load or register language", lang, err);
-      }
-      break;
-    }
-    case "highlight": {
-      const { code } = data;
-      const langs = data.languages.length ? data.languages : undefined;
-      try {
-        const { value, language } = self.hljs.highlightAuto(code, langs);
-        Object.assign(data, { value, language });
-      } catch (err) {
-        console.error("Could not transform some code?", err);
-        // Post back the original code
-        Object.assign(data, { value: code, language: "" });
-      }
-      break;
-    }
+self.addEventListener("message", ({ data }) => {
+  if (data.action !== "highlight") return;
+  const { code } = data;
+  const langs = data.languages?.length ? data.languages : undefined;
+  try {
+    const { value, language } = self.hljs.highlightAuto(code, langs);
+    Object.assign(data, { value, language });
+  } catch (err) {
+    console.error("Could not transform some code?", err);
+    Object.assign(data, { value: code, language: "" });
   }
   self.postMessage(data);
 });