fix: resolve Windows ESM loader error (issue #3887)

esbuild.mjs

@@ -57,34 +57,18 @@ const browserAliasPlugin = {
 
 /**
  * Node extension configuration
- * Uses ESM format for native ES module support, following the pattern from
- * https://github.com/microsoft/vscode-github-issue-notebooks
  * @type {import('esbuild').BuildOptions}
  */
 const nodeConfig = {
   entryPoints: ["src/extension.ts"],
   bundle: true,
-  format: "esm",
+  format: "cjs",
   minify: production,
-  sourcemap: true,
-  platform: "neutral",
-  target: ["node22"],
+  sourcemap: !production,
+  sourcesContent: false,
+  platform: "node",
   outfile: "dist/extension.js",
-  // Keep vscode external - provided by the VS Code extension host
-  // Keep prettier external - loaded dynamically at runtime
-  // Keep Node.js built-ins external - available in the extension host runtime
-  external: [
-    "vscode",
-    "prettier",
-    "fs",
-    "fs/promises",
-    "path",
-    "os",
-    "url",
-    "util",
-    "module",
-    "child_process",
-  ],
+  external: ["vscode", "prettier"],
   define: {
     "process.env.EXTENSION_NAME": JSON.stringify(
       `${extensionPackage.publisher}.${extensionPackage.name}`,

package.json

@@ -18,7 +18,6 @@
     "url": "https://github.com/prettier/prettier-vscode.git"
   },
   "license": "MIT",
-  "type": "module",
   "bugs": {
     "url": "https://github.com/prettier/prettier-vscode/issues"
   },

src/utils/resolvers.ts

@@ -1,5 +1,6 @@
 import { createRequire } from "module";
 import * as path from "path";
+import { pathToFileURL } from "url";
 import { PrettierOptions } from "../types.js";
 
 /**
@@ -12,7 +13,8 @@ function resolveNodeModule(
 ): string | undefined {
   try {
     // Create a require function rooted at the parent directory
-    const require = createRequire(parent);
+    // On Windows, createRequire needs a file:// URL for ESM compatibility
+    const require = createRequire(pathToFileURL(parent).href);
     return require.resolve(moduleName);
   } catch {
     return undefined;