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# Maintaining cjs-module-lexer
The [cjs-module-lexer](https://github.com/nodejs/node/tree/HEAD/deps/cjs-module-lexer)
dependency is used within the Node.js ESM implementation to detect the
named exports of a CommonJS module.
It is used within
[`node:internal/modules/esm/translators`](https://github.com/nodejs/node/blob/HEAD/lib/internal/modules/esm/translators.js)
in which both `internal/deps/cjs-module-lexer/lexer` and
`internal/deps/cjs-module-lexer/dist/lexer` are required and used.
`internal/deps/cjs-module-lexer/lexer`
is a regular JavaScript implementation that is
used when WebAssembly is not available on a platform.
`internal/deps/cjs-module-lexer/dist/lexer` is a faster
implementation using WebAssembly which is generated from a
C based implementation. These two paths
resolve to the files in `deps/cjs-module-lexer` due to their
inclusion in the `deps_files` entry in
[node.gyp](https://github.com/nodejs/node/blob/main/node.gyp).
The two different versions of lexer.js are maintained in the
[nodejs/cjs-module-lexer][] project.
In order to update the Node.js dependencies to use to a newer verion
of cjs-module-lexer, complete the following steps:
* Clone [nodejs/cjs-module-lexer][]
and check out the version that you want Node.js to use.
* Follow the WASM build steps outlined in
[wasm-build-steps](https://github.com/nodejs/cjs-module-lexer#wasm-build-steps).
This will generate the WASM based dist/lexer.js file.
* Preserving the same directory structure, copy the following files over
to `deps/cjs-module-lexer` directory where you have checked out Node.js.
```text
├── CHANGELOG.md
├── dist
│ ├── lexer.js
│ └── lexer.mjs
├── lexer.js
├── LICENSE
├── package.json
└── README.md
```
* Update the link to the cjs-module-lexer in the list at the end of
[doc/api/esm.md](../api/esm.md)
to point to the updated version.
* Create a PR, adding the files in the deps/cjs-module-lexer that
were modified.
If updates are needed to cjs-module-lexer for Node.js, first PR
those updates into
[nodejs/cjs-module-lexer][],
request a release and then pull in the updated version once available.
[nodejs/cjs-module-lexer]: https://github.com/nodejs/cjs-module-lexer
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