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babel-plugin-transform-async-generator-functions
Advanced tools
Turn async generator functions into ES2015 generators
The babel-plugin-transform-async-generator-functions package is a Babel plugin that transforms async generator functions to ES5. This allows developers to use async generator functions in environments that do not natively support them.
Transforming Async Generator Functions
This feature allows you to transform async generator functions into a format that is compatible with ES5. The code sample demonstrates how to use Babel to transform an async generator function using the plugin.
const babel = require('@babel/core');
const code = `
async function* asyncGenerator() {
yield 'Hello';
yield 'World';
}
`;
const output = babel.transformSync(code, {
plugins: ['babel-plugin-transform-async-generator-functions']
});
console.log(output.code);
This package transforms async functions to generator functions. While it does not handle async generator functions specifically, it is useful for transforming async functions to a format that is compatible with older JavaScript environments.
Regenerator is a tool to transform async functions and generators to ES5. It provides broader support for both async functions and generator functions, making it a more comprehensive solution compared to babel-plugin-transform-async-generator-functions.
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"]
});
FAQs
Turn async generator functions into ES2015 generators
We found that babel-plugin-transform-async-generator-functions demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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