https://github.com/developit/microbundle-2

https://github.com/developit/microbundle-2

Last synced: 9 months ago
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• Host: GitHub
• URL: https://github.com/developit/microbundle-2
• Owner: developit
• Created: 2024-07-19T17:48:38.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2025-03-14T15:57:54.000Z (10 months ago)
• Last Synced: 2025-04-14T03:14:42.227Z (9 months ago)
• Language: JavaScript
• Size: 38.1 KB
• Stars: 41
• Watchers: 1
• Forks: 2
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

          
# Microbundle 2

What if microbundle could figure out how to bundle your library based on the `"exports"` field you already have to define in your package.json?

And what if it was also absurdly fast, and one 500kb file with a single native dependency?

```sh

npm i -g microbundle-2

# or

npx microbundle-2

```

This is a reimplementation of [Microbundle](https://github.com/developit/microbundle)

built on [ESBuild](https://esbuild.github.io).



## Simple Example

You write a package.json that looks like this:

```jsonc

{

  "name": "simple",

  "type": "module",

  "exports": {

	"import": "./dist/lib.js",

	"default": "./dist/lib.cjs"

  }

}

```



## Multiple entries

Just define your package exports the way you already have to for Node/Vite/etc:

```jsonc

{

  "name": "multi-entry",

  "type": "module",

  "exports": {

    ".": {

      "types": "./dist/lib.d.ts",

      "import": "./dist/lib.js",

      "default": "./dist/lib.cjs"

    },

    "./a": {

      "types": "./dist/a.d.ts",

      "import": "./dist/a.js",

      "default": "./dist/a.cjs"

    },

    "./b": {

      "types": "./dist/b.d.ts",

      "import": "./dist/b.js",

      "default": "./dist/b.cjs"

    }

  }

}

```



This example has a dynamic import, which you can see produced a `./c` chunk. Both the ESM and CJS versions work the same way!

## Wildcards/patterns

Wildcard/pattern exports are also supported:

```jsonc

{

  "name": "patterns",

  "type": "module",

  "exports": {

    ".": {

      "types": "./build/index.d.ts",

      "import": "./build/index.js",

      "default": "./build/index.cjs"

    },

    "./lib/*": {

      "types": "./build/lib/*.d.ts",

      "import": "./build/lib/*.js",

      "default": "./build/lib/*.cjs"

    },

    "./components/*": {

      "source": "./lib/components/*.tsx",

      "types": "./build/components/*.d.ts",

      "import": "./build/components/*.js",

      "default": "./build/components/*.cjs"

    }

  }

}

```