Turn async generator functions and for-await statements to ES2015 generators
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Turn async generator functions and for-await statements to ES2015 generators
In
async function* agf() {
await 1;
yield 2;
}
Out
var _asyncGenerator = ...
let agf = (() => {
var _ref = _asyncGenerator.wrap(function* () {
yield _asyncGenerator.await(1);
yield 2;
});
return function agf() {
return _ref.apply(this, arguments);
};
})();
For await example
async function f() {
for await (let x of y) {
g(x);
}
}
Example Usage
async function* genAnswers() {
var stream = [ Promise.resolve(4), Promise.resolve(9), Promise.resolve(12) ];
var total = 0;
for await (let val of stream) {
total += await val;
yield total;
}
}
function forEach(ai, fn) {
return ai.next().then(function (r) {
if (!r.done) {
fn(r);
return forEach(ai, fn);
}
});
}
var output = 0;
forEach(genAnswers(), function(val) { output += val.value })
.then(function () {
console.log(output); // 42
});
npm install --save-dev babel-plugin-transform-async-generator-functions
.babelrc (Recommended).babelrc
{
"plugins": ["transform-async-generator-functions"]
}
babel --plugins transform-async-generator-functions script.js
require("babel-core").transform("code", {
plugins: ["transform-async-generator-functions"]
});