Initial release!

Author: developit

.gitignore

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+/dist
+/node_modules
+/package-lock.json

README.md

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+# Greenlet
+
+> Move an async function into its own thread.
+>
+> A simplified single-function version of [workerize](https://github.com/developit/workerize).
+
+The name is somewhat of a poor choice, but it was [available on npm](https://npm.im/greenlet).
+
+## Installation & Usage
+
+```sh
+npm i -S greenlet
+```
+
+Accepts an async function with, produces a copy of it that runs within a Web Worker.
+
+```
+greenlet(Function) -> Function
+```
+
+
+## Example
+
+```js
+import greenlet from 'greenlet'
+
+let get = greenlet(async url => {
+	let res = await fetch(url)
+	return await res.json()
+})
+
+console.log(await get('/foo'))
+```
+
+
+## License
+
+[MIT](https://oss.ninja/mit/developit)

greenlet.js

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+/** Move an async function into its own thread.
+ *  @param {Function} fn	The (async) function to run in a Worker.
+ */
+export default function greenlet(fn) {
+	let w = new Worker(URL.createObjectURL(new Blob([
+			'onmessage='+(
+				f => ({ data }) => Promise.resolve().then(
+					() => f.apply(f, data[1])
+				).then(
+					d => { postMessage([data[0], null, d]); },
+					e => { postMessage([data[0], ''+e]); }
+				)
+			)+'('+fn+')'
+		]))),
+		c = 0,
+		p = {};
+	w.onmessage = ({ data: [c,e,d] }) => {
+		p[c][e?1:0](e||d);
+		delete p[c];
+	};
+	return (...a) => new Promise( (y, n) => {
+		p[++c] = [y, n];
+		w.postMessage([c, a]);
+	});
+}

greenlet.test.js

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+import greenlet from 'greenlet';
+
+describe('greenlet', () => {
+	it('should return an async function', () => {
+		let g = greenlet( () => 'one' );
+		expect(g).toEqual(jasmine.any(Function));
+		expect(g()).toEqual(jasmine.any(Promise));
+	});
+
+	it('should invoke sync funtions', async () => {
+		let foo = greenlet( a => 'foo: '+a );
+
+		let ret = await foo('test');
+		expect(ret).toEqual('foo: test');
+	});
+
+	it('should invoke async funtions', async () => {
+		let bar = greenlet( a => new Promise( resolve => {
+			resolve('bar: '+a);
+		}));
+
+		let ret = await bar('test');
+		expect(ret).toEqual('bar: test');
+	});
+});

package.json

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+{
+  "name": "greenlet",
+  "version": "0.1.0",
+  "description": "Move an async function into its own thread.",
+  "source": "greenlet.js",
+  "main": "dist/greenlet.js",
+  "module": "dist/greenlet.m.js",
+  "scripts": {
+    "build": "microbundle",
+    "test": "eslint *.js && karmatic"
+  },
+  "eslintConfig": {
+    "extends": "eslint-config-developit"
+  },
+  "files": [
+    "greenlet.js"
+  ],
+  "repository": "developit/greenlet",
+  "keywords": [
+    "greenlet",
+    "thread",
+    "async",
+    "worker",
+    "web worker"
+  ],
+  "author": "Jason Miller <[email protected]> (http://jasonformat.com)",
+  "license": "MIT",
+  "homepage": "https://github.com/developit/greenlet",
+  "devDependencies": {
+    "eslint": "^4.16.0",
+    "eslint-config-developit": "^1.1.1",
+    "karmatic": "^1.0.6",
+    "microbundle": "^0.4.2"
+  }
+}