Remove dynamicImport and setDynamicImport

It turns out that the import expression won't actally be rewritten by
esbuild, so we can just write it directly.

While this won't help CJS emit, that already didn't work anyway, and
it's likely that this code is going to be moved outside of the codebase
into VS Code or a shared package elsewhere anyway.

Herebyfile.mjs

@@ -190,7 +190,6 @@ async function runDtsBundler(entrypoint, output) {
  * @typedef BundlerTaskOptions
  * @property {string[]} [external]
  * @property {boolean} [exportIsTsObject]
- * @property {boolean} [setDynamicImport]
  * @property {boolean} [treeShaking]
  */
 function createBundler(entrypoint, outfile, taskOptions = {}) {
@@ -257,22 +256,12 @@ function createBundler(entrypoint, outfile, taskOptions = {}) {
         };
 
         if (taskOptions.exportIsTsObject) {
-            // These snippets cannot appear in the actual source files, otherwise they will be rewritten
-            // to things like exports or requires.
-
+            // We use an IIFE so we can inject the footer, and so that "ts" is global if not loaded as a module.
+            options.format = "iife";
+            // Name the variable ts, matching our old big bundle and so we can use the code below.
+            options.globalName = "ts";
             // If we are in a CJS context, export the ts namespace.
-            let footer = `\nif (typeof module !== "undefined" && module.exports) { module.exports = ts; }`;
-
-            if (taskOptions.setDynamicImport) {
-                // If we are in a server bundle, inject the dynamicImport function.
-                // This only works because the web server's "start" function returns;
-                // the node server does not, but we don't use this there.
-                footer += `\nif (ts.server && ts.server.setDynamicImport) { ts.server.setDynamicImport(id => import(id)); }`;
-            }
-
-            options.format = "iife"; // We use an IIFE so we can inject the footer, and so that "ts" is global if not loaded as a module.
-            options.globalName = "ts"; // Name the variable ts, matching our old big bundle and so we can use the code below.
-            options.footer = { js: footer };
+            options.footer = { js: `\nif (typeof module !== "undefined" && module.exports) { module.exports = ts; }` };
         }
 
         return options;
@@ -416,7 +405,7 @@ const { main: tsserver, watch: watchTsserver } = entrypointBuildTask({
     // this is used in the browser too. Do the same thing that we do for our
     // libraries and generate an IIFE with name `ts`, as to not pollute the global
     // scope.
-    bundlerOptions: { exportIsTsObject: true, setDynamicImport: true },
+    bundlerOptions: { exportIsTsObject: true },
 });
 export { tsserver, watchTsserver };
 

src/webServer/webServer.ts

@@ -125,15 +125,6 @@ export class MainProcessLogger extends BaseLogger {
     }
 }
 
-let dynamicImport = async (_id: string): Promise<any> => {
-    throw new Error("Dynamic import not implemented");
-};
-
-/** @internal */
-export function setDynamicImport(fn: (id: string) => Promise<any>) {
-    dynamicImport = fn;
-}
-
 /** @internal */
 export function createWebSystem(host: WebHost, args: string[], getExecutingFilePath: () => string): ServerHost {
     const returnEmptyString = () => "";
@@ -182,7 +173,7 @@ export function createWebSystem(host: WebHost, args: string[], getExecutingFileP
 
             const scriptPath = combinePaths(packageRoot, browser);
             try {
-                const { default: module } = await dynamicImport(scriptPath);
+                const { default: module } = await import(scriptPath);
                 return { module, error: undefined };
             }
             catch (e) {