fix(dashboard): repair monaco deep import broken by 0.56 exports map (#7897) (#7922)

monaco-editor 0.56.0 (bumped in #7897) ships a restrictive `exports` map
("./*.js" -> "./esm/vs/*.js", "./*" -> "./esm/vs/*.js") that rewrites every
subpath by prepending esm/vs/. The pre-0.56 deep import
`monaco-editor/esm/vs/editor/editor.api` therefore resolved to the doubled,
non-existent `esm/vs/esm/vs/editor/editor.api.js` and broke the production
Turbopack build (Module not found in MonacoEditor.tsx).

Switch to the 0.56-compatible specifier `monaco-editor/editor/editor.api.js`,
which resolves to the same file (esm/vs/editor/editor.api.js) as before.

Adds tests/unit/monaco-editor-import-path.test.ts as a regression guard:
asserts the specifier has no esm/vs/ prefix and resolves to editor.api.js
against the installed monaco 0.56.

src/shared/components/MonacoEditor.tsx

@@ -11,7 +11,7 @@ const MonacoEditor = dynamic<EditorProps>(
   async () => {
     const [{ default: Editor, loader }, monaco] = await Promise.all([
       import("@monaco-editor/react"),
-      import("monaco-editor/esm/vs/editor/editor.api"),
+      import("monaco-editor/editor/editor.api.js"),
     ]);
     loader.config({ monaco });
     return Editor;

tests/unit/monaco-editor-import-path.test.ts

@@ -0,0 +1,35 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { createRequire } from "node:module";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import path from "node:path";
+
+const require = createRequire(import.meta.url);
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
+const monacoComponent = path.join(repoRoot, "src/shared/components/MonacoEditor.tsx");
+
+// Regression guard for #7897 (monaco-editor 0.55.1 -> 0.56.0). Monaco 0.56 shipped a
+// restrictive `exports` map (`"./*.js": "./esm/vs/*.js"`, `"./*": "./esm/vs/*.js"`) that
+// rewrites every subpath by prepending `esm/vs/`. The pre-0.56 deep import
+// `monaco-editor/esm/vs/editor/editor.api` therefore resolves to the doubled, non-existent
+// `esm/vs/esm/vs/editor/editor.api.js` and breaks the production (Turbopack) build. The
+// 0.56-compatible specifier drops the `esm/vs/` prefix: `monaco-editor/editor/editor.api.js`.
+
+test("MonacoEditor.tsx uses the 0.56-compatible monaco specifier (no esm/vs prefix)", () => {
+  const src = readFileSync(monacoComponent, "utf8");
+  const match = src.match(/import\(\s*["'](monaco-editor\/[^"']+)["']\s*\)/);
+  assert.ok(match, "expected a dynamic import of a monaco-editor subpath in MonacoEditor.tsx");
+  const specifier = match[1];
+  assert.ok(
+    !specifier.includes("esm/vs/"),
+    `monaco deep import must not include the esm/vs/ prefix under monaco 0.56 exports (got "${specifier}")`
+  );
+});
+
+test("the monaco specifier resolves to a real file under the installed monaco-editor", () => {
+  const src = readFileSync(monacoComponent, "utf8");
+  const specifier = src.match(/import\(\s*["'](monaco-editor\/[^"']+)["']\s*\)/)![1];
+  const resolved = require.resolve(specifier);
+  assert.ok(resolved.endsWith("editor.api.js"), `expected to resolve editor.api.js, got ${resolved}`);
+});