rollup plugin async

.gitignore

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+.DS_Store
+npm-debug.log
+node_modules

.travis.yml

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+language: node_js
+node_js:
+  - "6"
+  - "4"
+  - "iojs"
+  - "0.12"

README.md

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+Rollup Async functions plugin
+=============================
+
+[![Build Status](https://travis-ci.org/leebyron/rollup-plugin-async.svg?branch=master)](https://travis-ci.org/leebyron/rollup-plugin-async)
+
+This [Rollup](http://rollupjs.org/) plugin will replace [async functions](https://tc39.github.io/ecmascript-asyncawait/) with generator functions that can run in
+modern browsers or in most versions of node.js during bundling using [`async-to-gen`](https://github.com/leebyron/async-to-gen).
+
+## Install
+
+```
+npm install --save rollup-plugin-async
+```
+
+```js
+var rollup = require('rollup').rollup;
+var async = require('rollup-plugin-async');
+
+rollup({
+  entry: 'main.js',
+  plugins: [ async() ]
+}).then(...);
+```

index.js

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+var asyncToGen = require('async-to-gen');
+var fs = require('fs');
+var os = require('os');
+var path = require('path');
+var createFilter = require('rollup-pluginutils').createFilter;
+
+module.exports = function(options) {
+  options = options || {};
+  var filter = createFilter(options.include, options.exclude);
+  const sourceMap = options.sourceMap !== false;
+
+  return {
+    name: 'async-to-gen',
+    transform: function(code, id) {
+      if (filter(id)) {
+        var result = asyncToGen(code, {
+          sourceMap: sourceMap,
+          includeHelper: false
+        });
+        if (result.isEdited) {
+          result.prepend('import { __async } from "' + getAsyncHelperFile() + '"\n');
+        }
+        return {
+          code: result.toString(),
+          map: sourceMap ? result.generateMap() : { mappings: '' }
+        };
+      }
+    }
+  };
+}
+
+var _asyncHelperFile;
+
+function getAsyncHelperFile() {
+  if (!_asyncHelperFile) {
+    _asyncHelperFile = path.join(os.tmpdir(), 'asyncHelper.' + Date.now() + '.js');
+    fs.writeFileSync(_asyncHelperFile, 'export ' + asyncToGen.asyncHelper);
+    process.on('exit', function () {
+      fs.unlinkSync(_asyncHelperFile)
+    })
+  }
+  return _asyncHelperFile;
+}

package.json

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+{
+  "name": "rollup-plugin-async",
+  "version": "1.0.1",
+  "description": "Transforms Async functions to generator functions before bundling.",
+  "author": "Lee Byron <lee@leebyron.com> (http://leebyron.com/)",
+  "license": "BSD-3-Clause",
+  "main": "index.js",
+  "homepage": "https://github.com/leebyron/rollup-plugin-async",
+  "bugs": {
+    "url": "https://github.com/leebyron/rollup-plugin-async/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/leebyron/rollup-plugin-async.git"
+  },
+  "scripts": {
+    "test": "DIFF=$(rollup -c test/rollup.config.js test/source.js | diff test/expected.js -); if [ -n \"$DIFF\" ]; then echo \"$DIFF\"; exit 1; fi;",
+    "test-update": "rollup -c test/rollup.config.js test/source.js > test/expected.js"
+  },
+  "keywords": [
+    "rollup-plugin",
+    "async",
+    "await",
+    "async-to-gen"
+  ],
+  "dependencies": {
+    "async-to-gen": "^1.0.1",
+    "rollup-pluginutils": "^1.5.1"
+  },
+  "devDependencies": {
+    "rollup": "^0.34.1"
+  }
+}

test/expected.js

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+'use strict';
+
+function __async(f){var g=f();return new Promise(function(s,j){function c(a,x){try{var r=g[x?"throw":"next"](a)}catch(e){return j(e)}return r.done?s(r.value):Promise.resolve(r.value).then(c,d)}function d(e){return c(e,1)}c()})}
+
+function mystery() {return __async(function*(){
+  return yield 'oOOoooOOOooo'
+})}
+
+// async function statement
+function foo() {return __async(function*(){
+  return yield mystery()
+})}
+
+foo().then(console.log)

test/rollup.config.js

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+var async = require('../');
+
+module.exports = {
+  plugins: [ async() ],
+  format: 'cjs'
+};

test/source.js

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+import { mystery } from './source2'
+
+// async function statement
+async function foo() {
+  return await mystery()
+}
+
+foo().then(console.log)

test/source2.js

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+export async function mystery() {
+  return await 'oOOoooOOOooo'
+}