Files
node/lib/internal
Paul Bouchon 1b2de5e052 module: fix --check on ambiguous ESM files
A `.js` file with no `"type"` in the nearest package.json has no format
of its own, and `defaultGetFormat()` reports it as null. `--check`
passed that null straight to `wrapSafe()`, which parses as CommonJS.
Module syntax makes that parse bail out early, so the file was reported
as valid and `--check` exited 0 even though it is not valid JavaScript
under either goal.

At load time the goal for such a file is decided by looking for module
syntax in the source. Decide it the same way here, so the file is
parsed as a module and its real syntax error is reported. Files whose
format is known are unaffected, as are ambiguous files without module
syntax, which are still parsed as CommonJS.

Fixes: https://github.com/nodejs/node/issues/65202
Signed-off-by: Paul Bouchon <mail@bitpshr.net>
PR-URL: https://github.com/nodejs/node/pull/65203
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Aviv Keller <me@aviv.sh>
2026-08-12 21:47:11 +00:00
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Internal Modules

The modules located in lib/internal directory are exclusively meant for internal usage within the Node.js core. They are not intended to be accessed via user modules require(). These modules may change at any point in time. Relying on these internal modules outside the core is not supported and can lead to unpredictable behavior.

In certain scenarios, accessing these internal modules for debugging or experimental purposes might be necessary. Node.js provides the --expose-internals flag to expose these modules to userland code. This flag only exists to assist Node.js maintainers with debugging internals. It is not meant for use outside the project.