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Status](https://travis-ci.org/shinnn/rollup-config-module.svg?branch=master)](https://travis-ci.org/shinnn/rollup-config-module)\n[![Coverage Status](https://img.shields.io/coveralls/shinnn/rollup-config-module.svg)](https://coveralls.io/github/shinnn/rollup-config-module)\n\n[Rollup](https://github.com/rollup/rollup) config to create npm modules that support both [ECMAScript module](http://www.2ality.com/2014/09/es6-modules-final.html) and [CommonJS](http://www.commonjs.org/)\n\n## Installation\n\n[Use](https://docs.npmjs.com/cli/install) [npm](https://docs.npmjs.com/getting-started/what-is-npm).\n\n```\nnpm install --save-dev rollup-config-module\n```\n\n## Usage\n\n### For module authors\n\n1. Include `rollup --config=node:module` to the build part of your module's [npm scripts](https://docs.npmjs.com/misc/scripts).\n\n  ```json\n  \"scripts\": {\n    \"build\": \"rollup --config=node:module\",\n    \"pretest\": \"npm run-script build\"\n  }\n  ```\n2. Write your module using ECMAScript [`import`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/import) / [`export`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/export) instead of [`require`](https://nodejs.org/api/globals.html#globals_require) / [`module.exports`](https://nodejs.org/api/modules.html#modules_module_exports), and save it as `index.mjs`.\n3. Add [`module` field](https://github.com/dherman/defense-of-dot-js/blob/master/proposal.md#typical-usage) to `package.json` and let it point to `index.mjs`.\n\n  ```json\n  \"module\": \"index.mjs\"\n  ```\n4. Run the build script and you'll see `index.js` is created.\n5. [Include](https://docs.npmjs.com/files/package.json#files) both `index.mjs` and `index.js` to the published npm package.\n\n  ```json\n  \"files\": [\n    \"index.js\",\n    \"index.mjs\"\n  ]\n  ```\n\n[A real world example](https://github.com/shinnn/array-to-sentence) would help understanding how to create a package with rollup-config-module.\n\n### For module users\n\nModules built with this configuration can be used in both ES2015+ projects and traditional `require`-based projects.\n\nUsers can load `index.mjs` with a build tool that supports `module` field, for example [rollup-plugin-node-resolve](https://github.com/rollup/rollup-plugin-node-resolve) and [Webpack](https://webpack.js.org/configuration/resolve/#resolve-mainfields).\n\n```javascript\nimport fn from 'awesome-npm-package';\n```\n\nUsers can also load `index.js` via Node's built-in `require`,\n\n```javascript\nconst fn = require('awesome-npm-package');\n```\n\nbecause `index.js` has been compiled from `index.mjs` with all `import` and `export` replaced with `require` and `module.exports`.\n\n```javascript\nimport {inspect} from 'util';\nimport isNaturalNumber from 'is-natural-number';\n\nexport default function(v) {\n  if (!isNaturalNumber(v)) {\n    console.log(inspect(v) + 'is not a natural number.');\n  }\n}\n```\n↓\n\n```javascript\n'use strict';\n\nvar util = require('util');\nvar isNaturalNumber = require('is-natural-number');\n\nmodule.exports = function(v) {\n  if (!isNaturalNumber(v)) {\n    console.log(util.inspect(v) + 'is not a natural number.');\n  }\n}\n```\n\n## License\n\n[ISC License](./LICENSE) © 2018 Shinnosuke Watanabe\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshinnn%2Frollup-config-module","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fshinnn%2Frollup-config-module","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshinnn%2Frollup-config-module/lists"}