Use async generators via babel

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*.out.js

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README.md

Use async generators via babel

While Syntax async generators · Babel says

If you want to transform it then see transform-regenerator, transform-async-to-generator, or transform-async-to-module-method.

it seems only transform-regenerator supports async generators.

babel.js

var babel = require('babel-core');
var fs = require('fs');

var code = fs.readFileSync(process.argv[2]);
var plugins = {
  'transform-async-to-generator': [
    'syntax-async-functions',
    'syntax-async-generators',
    'transform-async-to-generator'
  ],

  'transform-async-to-module-method': [
    'syntax-async-functions',
    'syntax-async-generators',
    ['transform-async-to-module-method', {
      // Without these options transforming fails.
      module: 'bluebird',
      method: 'coroutine'
    }]
  ],

  'transform-regenerator': [
    'syntax-async-functions',
    'syntax-async-generators',
    ['transform-regenerator', {
      asyncGenerators: true,
      generators: true,
      async: true
    }]
  ]
};

for (var key of Object.keys(plugins)) {
  console.log(key);
  var result = babel.transform(code, { plugins: plugins[key] });
  var path = `out/${key}.out.js`;
  fs.writeFileSync(path, result.code);
}

package.json

{
  "dependencies": {
    "babel-core": "^6.7.2",
    "babel-plugin-syntax-async-functions": "^6.5.0",
    "babel-plugin-syntax-async-generators": "^6.5.0",
    "babel-plugin-transform-async-to-generator": "^6.7.0",
    "babel-plugin-transform-async-to-module-method": "^6.7.0",
    "babel-plugin-transform-regenerator": "^6.6.5"
  },
  "license": "CC0-1.0"
}

sample.js

async function * asyncGenerator () {
  await Promise.resolve(1);
  yield Promise.resolve(1);
}

async function asyncFunction () {
  await Promise.resolve(1);
}

function * generator () {
  yield 1;
}