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Support Node conditional exports

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@developit 已经在做这个了。

开始于 2020年12月18日。

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描述

enhancement :rocket: important

In node 13, there is a new option available: exports.

As this will be the new standard for defining packages available for node/browsers/etc, it could be nice to use it instead/addition of the module, unpkg etc. fields in the current package.json. Webpack also plans to support it in the v5: https://github.com/webpack/webpack/issues/9509

Current API:

{
  "source": "src/foo.js",           // Your source file (same as 1st arg to microbundle)
  "main": "dist/foo.js",            // output path for CommonJS/Node
  "module": "dist/foo.module.js",   // output path for JS Modules
  "unpkg": "dist/foo.umd.js",       // optional, for unpkg.com
  "scripts": {
    "build": "microbundle",         // uses "source" and "main" as input and output paths by default
    "dev": "microbundle watch"
  }
}

New API:

{
  "source": "src/foo.js",           // Your source file (same as 1st arg to microbundle)
  "main": "dist/foo.js",            // output path for CommonJS/Node
  "exports": { 
    "import": "dist/foo.module.js", // output path for JS Modules
    "browser": "dist/foo.umd.js",   // optional, for unpkg.com
  },
  "scripts": {
    "build": "microbundle",         // uses "source" and "main" as input and output paths by default
    "dev": "microbundle watch"
  }
}
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