module: reduce circular dependency of internal/modules/cjs/loader

Previously `internal/bootstrap/pre_execution.js` requires
`internal/modules/cjs/loader.js` which in turn requires
`internal/bootstrap/pre_execution.js`. This patch moves the
entry point execution logic out of `pre_execution.js` and
puts it into `internal/modules/run_main.js`. It also tests
that `Module.runMain` can be monkey-patched before further
deprecation/refactoring can be done.

Also added an internal assertion `hasLoadedAnyUserCJSModule`
for documentation purposes.

PR-URL: https://github.com/nodejs/node/pull/30349
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/test/parallel/test-module-run-main-monkey-patch.js b/test/parallel/test-module-run-main-monkey-patch.js
new file mode 100644
index 0000000000..c9f189abb6
--- /dev/null
+++ b/test/parallel/test-module-run-main-monkey-patch.js
@@ -0,0 +1,18 @@
+'use strict';
+
+// This tests that module.runMain can be monkey patched using --require.
+// TODO(joyeecheung): This probably should be deprecated.
+
+require('../common');
+const { path } = require('../common/fixtures');
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+
+const child = spawnSync(process.execPath, [
+  '--require',
+  path('monkey-patch-run-main.js'),
+  path('semicolon.js'),
+]);
+
+assert.strictEqual(child.status, 0);
+assert(child.stdout.toString().includes('runMain is monkey patched!'));