esm: handle globalPreload hook returning a nullish value

PR-URL: #48249 Fixes: #48240 Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> Reviewed-By: Jacob Smith <jacob@frende.me>

Author: aduh95

lib/internal/modules/esm/hooks.js

@@ -169,7 +169,7 @@ class Hooks {
  port: insideLoader,
  });
 
- if (preloaded == null) { return; }
+ if (preloaded == null) { continue; }
 
  if (typeof preloaded !== 'string') { // [2]
  throw new ERR_INVALID_RETURN_VALUE(

test/es-module/test-esm-loader-hooks.mjs

@@ -400,6 +400,20 @@ describe('Loader hooks', { concurrency: true }, () => {
  });
  });
 
+ it('should handle globalPreload returning undefined', async () => {
+ const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
+ '--no-warnings',
+ '--experimental-loader',
+ 'data:text/javascript,export function globalPreload(){}',
+ fixtures.path('empty.js'),
+ ]);
+
+ assert.strictEqual(stderr, '');
+ assert.strictEqual(stdout, '');
+ assert.strictEqual(code, 0);
+ assert.strictEqual(signal, null);
+ });
+
  it('should be fine to call `process.removeAllListeners("beforeExit")` from the main thread', async () => {
  const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
  '--no-warnings',