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Add IIFE external notice #1257

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Add IIFE external notice #1257

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4 changes: 3 additions & 1 deletion docs/README.md
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Expand Up @@ -56,6 +56,8 @@ This will output `dist/index.js` and `dist/cli.js`.

By default tsup bundles all `import`-ed modules but `dependencies` and `peerDependencies` in your `package.json` are always excluded, you can also use `--external <module|pkgJson>` flag to mark other packages or other special `package.json`'s `dependencies` and `peerDependencies` as external.

**IMPORTANT**: IIFE output is not supported with `--external` option.

### Excluding all packages

If you are using **tsup** to build for **Node.js** applications/APIs, usually bundling dependencies is not needed, and it can even break things, for instance, while outputting to [ESM](https://nodejs.org/api/esm.html).
Expand Down Expand Up @@ -617,4 +619,4 @@ This usually happens when you have `emitDecoratorMetadata` enabled in your tscon

## License

MIT &copy; [EGOIST](https://github.com/sponsors/egoist)
MIT &copy; [EGOIST](https://github.com/sponsors/egoist)