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Viewing file:     getMaxWorkers.js (1.6 KB)      -rw-r--r--

'use strict';

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

function _os() {
  const data = require('os');

  _os = function () {
    return data;
  };

  return data;
}

/**
 * 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.
 */
function getMaxWorkers(argv, defaultOptions) {
  if (argv.runInBand) {
    return 1;
  } else if (argv.maxWorkers) {
    return parseWorkers(argv.maxWorkers);
  } else if (defaultOptions && defaultOptions.maxWorkers) {
    return parseWorkers(defaultOptions.maxWorkers);
  } else {
    var _cpusInfo$length;

    // In watch mode, Jest should be unobtrusive and not use all available CPUs.
    const cpusInfo = (0, _os().cpus)();
    const numCpus =
      (_cpusInfo$length =
        cpusInfo === null || cpusInfo === void 0 ? void 0 : cpusInfo.length) !==
        null && _cpusInfo$length !== void 0
        ? _cpusInfo$length
        : 1;
    const isWatchModeEnabled = argv.watch || argv.watchAll;
    return Math.max(
      isWatchModeEnabled ? Math.floor(numCpus / 2) : numCpus - 1,
      1
    );
  }
}

const parseWorkers = maxWorkers => {
  const parsed = parseInt(maxWorkers.toString(), 10);

  if (
    typeof maxWorkers === 'string' &&
    maxWorkers.trim().endsWith('%') &&
    parsed > 0 &&
    parsed <= 100
  ) {
    const numCpus = (0, _os().cpus)().length;
    const workers = Math.floor((parsed / 100) * numCpus);
    return Math.max(workers, 1);
  }

  return parsed > 0 ? parsed : 1;
};