Keep import() of an ES module in the CommonJS output

The CJS build transpiled with module CommonJS and NodeNext resolution. On
TypeScript 5.5 that kept import() of an ES module; from 5.6 it becomes
require(), which an ES module cannot answer on Node before 22. CJS is now
emitted with module NodeNext, under which TypeScript must keep import() for
an ES module. Across this repository's output the only change is that line,
plus a strict-mode header on one file with no imports.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

packages/dev/scripts/pezkuwi-dev-build-ts.mjs

@@ -73,7 +73,12 @@ async function compileJs (compileType, type) {
 
         const source = fs.readFileSync(filename, 'utf-8');
 
-        // compile with the options aligning with our tsconfig
+        // compile with the options aligning with our tsconfig. CJS is emitted
+        // under Node's own rules (NodeNext; a lone file is taken as CommonJS):
+        // CommonJS with NodeNext resolution kept `import()` of an ES module on
+        // TypeScript 5.5 and turned it into require() from 5.6 on, which an ES
+        // module cannot answer on Node before 22 (rootEsm.spec "contains
+        // import(...) in cjs").
         const { outputText } = ts.transpileModule(source, {
           compilerOptions: {
             esModuleInterop: true,
@@ -82,11 +87,12 @@ async function compileJs (compileType, type) {
               ? ts.JsxEmit.ReactJSX
               : undefined,
             module: type === 'cjs'
-              ? ts.ModuleKind.CommonJS
+              ? ts.ModuleKind.NodeNext
               : ts.ModuleKind.ESNext,
             moduleResolution: ts.ModuleResolutionKind.NodeNext,
             target: TARGET_TSES
-          }
+          },
+          fileName: filename
         });
 
         mkdirpSync(path.dirname(outFile));
@@ -448,6 +454,7 @@ function relativePath (value) {
   if (!value || typeof value !== 'string') {
     return '';
   }
+
   return value.startsWith('.') ? value : `./${value}`;
 }