@babel/plugin-transform-async-to-generator/lib/index.js

Turn async functions into ES2015 generators

import { declare } from '@babel/helper-plugin-utils';
import remapAsyncToGenerator from '@babel/helper-remap-async-to-generator';
import { addNamed } from '@babel/helper-module-imports';
import { types } from '@babel/core';

const index = declare((api, options) => {
  api.assertVersion("^7.0.0-0 || ^8.0.0");
  const {
    method,
    module
  } = options;
  const noNewArrows = api.assumption("noNewArrows") ?? true;
  const ignoreFunctionLength = api.assumption("ignoreFunctionLength") ?? false;
  if (method && module) {
    return {
      name: "transform-async-to-generator",
      visitor: {
        Function(path, state) {
          if (!path.node.async || path.node.generator) return;
          let wrapAsync = state.methodWrapper;
          if (wrapAsync) {
            wrapAsync = types.cloneNode(wrapAsync);
          } else {
            wrapAsync = state.methodWrapper = addNamed(path, method, module);
          }
          remapAsyncToGenerator(path, {
            wrapAsync
          }, noNewArrows, ignoreFunctionLength);
        }
      }
    };
  }
  return {
    name: "transform-async-to-generator",
    visitor: {
      Function(path, state) {
        if (!path.node.async || path.node.generator) return;
        remapAsyncToGenerator(path, {
          wrapAsync: state.addHelper("asyncToGenerator")
        }, noNewArrows, ignoreFunctionLength);
      }
    }
  };
});

export { index as default };
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