Build modern CommonJS and support package.json exports

[enisdenjo]

Use node16 for building CJS

Warning

Unless moduleResolution is explicitly set to classic, node or node10 - then commonjs (Node <v12 style CJS) will be used.

Output leaves dynamic import() calls as-is, so CommonJS can asynchronously import ESM (Node can import ESM from CJS).

node16 and nodenext are the only correct module options for all apps and libraries that are intended to run in Node.js v12 or later, whether they use ES modules or not.

TypeScript documentation

Node.js v12 security support reached EOL in 2022 (and active support in 2020).

Use node16 or nodenext or es2022 for building ESM

If the nearest tsconfig.json's moduleResolution is either node16 or nodenext, the module will use that value. Otherwise, it'll use es2022.

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Aside from building to "modern" CJS, another benefit of using module: node16 is that it works with moduleResolution: node16 | nodenext (allowing the usage of exports field in package.json) whereas module: commonjs doesn't.

[changeset-bot]

🦋 Changeset detected

Latest commit: 1c6814b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
bob-the-bundler	Major

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
bob-the-bundler	8.0.0-alpha-20250116201822-1c6814b11c3fec160bbf4b301ed13402ff664183	npm ↗︎ unpkg ↗︎