createProcessObject.js

'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
exports.default = _default;

var _deepCyclicCopy = _interopRequireDefault(require('./deepCyclicCopy'));

function _interopRequireDefault(obj) {
  return obj && obj.__esModule ? obj : {default: obj};
}

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
const BLACKLIST = new Set(['env', 'mainModule', '_events']);
const isWin32 = process.platform === 'win32';
const proto = Object.getPrototypeOf(process.env); // The "process.env" object has a bunch of particularities: first, it does not
// directly extend from Object; second, it converts any assigned value to a
// string; and third, it is case-insensitive in Windows. We use a proxy here to
// mimic it (see https://nodejs.org/api/process.html#process_process_env).

function createProcessEnv() {
  const real = Object.create(proto);
  const lookup = {};

  function deletePropertyWin32(_target, key) {
    for (const name in real) {
      if (real.hasOwnProperty(name)) {
        if (typeof key === 'string') {
          if (name.toLowerCase() === key.toLowerCase()) {
            delete real[name];
            delete lookup[name.toLowerCase()];
          }
        } else {
          if (key === name) {
            delete real[name];
            delete lookup[name];
          }
        }
      }
    }

    return true;
  }

  function deleteProperty(_target, key) {
    delete real[key];
    delete lookup[key];
    return true;
  }

  function getProperty(_target, key) {
    return real[key];
  }

  function getPropertyWin32(_target, key) {
    if (typeof key === 'string') {
      return lookup[key in proto ? key : key.toLowerCase()];
    } else {
      return real[key];
    }
  }

  const proxy = new Proxy(real, {
    deleteProperty: isWin32 ? deletePropertyWin32 : deleteProperty,
    get: isWin32 ? getPropertyWin32 : getProperty,

    set(_target, key, value) {
      const strValue = '' + value;

      if (typeof key === 'string') {
        lookup[key.toLowerCase()] = strValue;
      }

      real[key] = strValue;
      return true;
    }
  });
  return Object.assign(proxy, process.env);
}

function _default() {
  const process = require('process');

  const newProcess = (0, _deepCyclicCopy.default)(process, {
    blacklist: BLACKLIST,
    keepPrototype: true
  });

  try {
    // This fails on Node 12, but it's already set to 'process'
    newProcess[Symbol.toStringTag] = 'process';
  } catch (e) {
    // Make sure it's actually set instead of potentially ignoring errors
    if (newProcess[Symbol.toStringTag] !== 'process') {
      e.message =
        'Unable to set toStringTag on process. Please open up an issue at https://github.com/facebook/jest\n\n' +
        e.message;
      throw e;
    }
  } // Sequentially execute all constructors over the object.

  let proto = process;

  while ((proto = Object.getPrototypeOf(proto))) {
    if (typeof proto.constructor === 'function') {
      proto.constructor.call(newProcess);
    }
  }

  newProcess.env = createProcessEnv();

  newProcess.send = () => {};

  const domainPropertyDescriptor = Object.getOwnPropertyDescriptor(
    newProcess,
    'domain'
  );

  if (domainPropertyDescriptor && !domainPropertyDescriptor.enumerable) {
    Object.defineProperty(newProcess, 'domain', {
      get() {
        return process.domain;
      }
    });
  }

  return newProcess;
}