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A loader determines how to map imports & file extensions to transforms and output.
Currently, Bun implements the following loaders:
| Input | Loader | Output |
| ----- | ----------------------------- | ------ |
| .js | JSX + JavaScript | .js |
| .jsx | JSX + JavaScript | .js |
| .ts | TypeScript + JavaScript | .js |
| .tsx | TypeScript + JSX + JavaScript | .js |
| .mjs | JavaScript | .js |
| .cjs | JavaScript | .js |
| .mts | TypeScript | .js |
| .cts | TypeScript | .js |
| .toml | TOML | .js |
| .css | CSS | .css |
| .env | Env | N/A |
| .\* | file | string |
Everything else is treated as `file`. `file` replaces the import with a URL (or a path).
You can configure which loaders map to which extensions by passing `--loaders` to `bun`. For example:
```sh
$ bun --loader=.js:js
```
This will disable JSX transforms for `.js` files.
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