feeles-ide/lib/File/babelFile.js

The hackable and serializable IDE to make learning material

import _extends from 'babel-runtime/helpers/extends';
import _Promise from 'babel-runtime/core-js/promise';
import _Map from 'babel-runtime/core-js/map';
import BabelWorker from '../workers/babel.worker';

// WebWorker instance
var worker = new BabelWorker();

// <string, { file, resolve, reject }> map
var pool = new _Map();

// Receive messages from Babel
worker.addEventListener('message', function (event) {
  // Result of transpiling
  var _event$data = event.data,
      id = _event$data.id,
      code = _event$data.code,
      error = _event$data.error;

  if (!pool.has(id)) {
    // Not Found Error
    console.warn('Error in Babel: Unknown id=' + id, '_File.js:babelFile');
  }

  var _pool$get = pool.get(id),
      file = _pool$get.file,
      resolve = _pool$get.resolve,
      reject = _pool$get.reject;

  pool.delete(id);

  if (error) {
    // Got a Babel Error!
    var loc = error.loc,
        message = error.message;

    var babelError = new Error(message, file.name, loc.line);
    reject(babelError);
  } else {
    resolve(file.set({
      text: code
    }));
  }
});

var babelFile = function () {
  var count = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;
  return function (file, babelrc) {
    return new _Promise(function (resolve, reject) {
      if (file.isScript && file.text.length < 100000) {
        var id = 'unique in babelFile.js:babelFile--' + count++;
        // Set into the pool
        pool.set(id, {
          file: file,
          resolve: resolve,
          reject: reject
        });
        // Send messages from Babel
        worker.postMessage({
          id: id,
          code: file.text,
          options: _extends({}, babelrc, {
            filename: file.name
          })
        });
      } else {
        resolve(file);
      }
    });
  };
}();

export default babelFile;