flow like the river

BACK_BACK/node_modules/@parcel/workers/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017-present Devon Govett
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

BACK_BACK/node_modules/@parcel/workers/index.js

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+// Node 8 supports native async functions - no need to use compiled code!
+module.exports =
+  parseInt(process.versions.node, 10) < 8
+    ? require('./lib/WorkerFarm')
+    : require('./src/WorkerFarm');

BACK_BACK/node_modules/@parcel/workers/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@parcel/workers",
+  "version": "1.11.0",
+  "description": "Blazing fast, zero configuration web application bundler",
+  "main": "index.js",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/parcel-bundler/parcel.git"
+  },
+  "engines": {
+    "node": ">= 6.0.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "test": "cross-env NODE_ENV=test mocha",
+    "test-ci": "yarn build && yarn test",
+    "format": "prettier --write \"./{src,bin,test}/**/*.{js,json,md}\"",
+    "lint": "eslint . && prettier \"./{src,bin,test}/**/*.{js,json,md}\" --list-different",
+    "build": "babel src -d lib",
+    "prepublish": "yarn build"
+  },
+  "devDependencies": {
+    "mocha": "^5.2.0"
+  },
+  "dependencies": {
+    "@parcel/utils": "^1.11.0",
+    "physical-cpu-count": "^2.0.0"
+  },
+  "gitHead": "34eb91e8e6991073e594bff731c333d09b0403b5"
+}

BACK_BACK/node_modules/@parcel/workers/src/.babelrc

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+{
+  "presets": [["@babel/preset-env", {
+    "targets": {
+      "node": "6"
+    }
+  }]],
+  "plugins": ["@babel/plugin-transform-runtime"]
+}

BACK_BACK/node_modules/@parcel/workers/src/.eslintrc.json

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+{
+  "extends": "../../../../.eslintrc.json"
+}

BACK_BACK/node_modules/@parcel/workers/src/Worker.js

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+const childProcess = require('child_process');
+const {EventEmitter} = require('events');
+const {errorUtils} = require('@parcel/utils');
+
+const childModule = require.resolve('./child');
+
+let WORKER_ID = 0;
+class Worker extends EventEmitter {
+  constructor(options) {
+    super();
+
+    this.options = options;
+    this.id = WORKER_ID++;
+
+    this.sendQueue = [];
+    this.processQueue = true;
+
+    this.calls = new Map();
+    this.exitCode = null;
+    this.callId = 0;
+
+    this.ready = false;
+    this.stopped = false;
+    this.isStopping = false;
+  }
+
+  async fork(forkModule, bundlerOptions) {
+    let filteredArgs = process.execArgv.filter(
+      v => !/^--(debug|inspect)/.test(v)
+    );
+
+    let options = {
+      execArgv: filteredArgs,
+      env: process.env,
+      cwd: process.cwd()
+    };
+
+    this.child = childProcess.fork(childModule, process.argv, options);
+
+    this.child.on('message', data => this.receive(data));
+
+    this.child.once('exit', code => {
+      this.exitCode = code;
+      this.emit('exit', code);
+    });
+
+    this.child.on('error', err => {
+      this.emit('error', err);
+    });
+
+    await new Promise((resolve, reject) => {
+      this.call({
+        method: 'childInit',
+        args: [forkModule],
+        retries: 0,
+        resolve,
+        reject
+      });
+    });
+
+    await this.init(bundlerOptions);
+  }
+
+  async init(bundlerOptions) {
+    this.ready = false;
+
+    return new Promise((resolve, reject) => {
+      this.call({
+        method: 'init',
+        args: [bundlerOptions],
+        retries: 0,
+        resolve: (...args) => {
+          this.ready = true;
+          this.emit('ready');
+          resolve(...args);
+        },
+        reject
+      });
+    });
+  }
+
+  send(data) {
+    if (!this.processQueue) {
+      return this.sendQueue.push(data);
+    }
+
+    let result = this.child.send(data, error => {
+      if (error && error instanceof Error) {
+        // Ignore this, the workerfarm handles child errors
+        return;
+      }
+
+      this.processQueue = true;
+
+      if (this.sendQueue.length > 0) {
+        let queueCopy = this.sendQueue.slice(0);
+        this.sendQueue = [];
+        queueCopy.forEach(entry => this.send(entry));
+      }
+    });
+
+    if (!result || /^win/.test(process.platform)) {
+      // Queue is handling too much messages throttle it
+      this.processQueue = false;
+    }
+  }
+
+  call(call) {
+    if (this.stopped || this.isStopping) {
+      return;
+    }
+
+    let idx = this.callId++;
+    this.calls.set(idx, call);
+
+    this.send({
+      type: 'request',
+      idx: idx,
+      child: this.id,
+      method: call.method,
+      args: call.args
+    });
+  }
+
+  receive(data) {
+    if (this.stopped || this.isStopping) {
+      return;
+    }
+
+    let idx = data.idx;
+    let type = data.type;
+    let content = data.content;
+    let contentType = data.contentType;
+
+    if (type === 'request') {
+      this.emit('request', data);
+    } else if (type === 'response') {
+      let call = this.calls.get(idx);
+      if (!call) {
+        // Return for unknown calls, these might accur if a third party process uses workers
+        return;
+      }
+
+      if (contentType === 'error') {
+        call.reject(errorUtils.jsonToError(content));
+      } else {
+        call.resolve(content);
+      }
+
+      this.calls.delete(idx);
+      this.emit('response', data);
+    }
+  }
+
+  async stop() {
+    if (!this.stopped) {
+      this.stopped = true;
+
+      if (this.child) {
+        this.child.send('die');
+
+        let forceKill = setTimeout(
+          () => this.child.kill('SIGINT'),
+          this.options.forcedKillTime
+        );
+        await new Promise(resolve => {
+          this.child.once('exit', resolve);
+        });
+
+        clearTimeout(forceKill);
+      }
+    }
+  }
+}
+
+module.exports = Worker;

BACK_BACK/node_modules/@parcel/workers/src/WorkerFarm.js

@@ -0,0 +1,300 @@
+const {EventEmitter} = require('events');
+const {errorUtils} = require('@parcel/utils');
+const Worker = require('./Worker');
+const cpuCount = require('./cpuCount');
+
+let shared = null;
+
+/**
+ * workerPath should always be defined inside farmOptions
+ */
+
+class WorkerFarm extends EventEmitter {
+  constructor(options, farmOptions = {}) {
+    super();
+    this.options = {
+      maxConcurrentWorkers: WorkerFarm.getNumWorkers(),
+      maxConcurrentCallsPerWorker: WorkerFarm.getConcurrentCallsPerWorker(),
+      forcedKillTime: 500,
+      warmWorkers: true,
+      useLocalWorker: true
+    };
+
+    if (farmOptions) {
+      this.options = Object.assign(this.options, farmOptions);
+    }
+
+    this.warmWorkers = 0;
+    this.workers = new Map();
+    this.callQueue = [];
+
+    if (!this.options.workerPath) {
+      throw new Error('Please provide a worker path!');
+    }
+
+    this.localWorker = require(this.options.workerPath);
+    this.run = this.mkhandle('run');
+
+    this.init(options);
+  }
+
+  warmupWorker(method, args) {
+    // Workers are already stopping
+    if (this.ending) {
+      return;
+    }
+
+    // Workers are not warmed up yet.
+    // Send the job to a remote worker in the background,
+    // but use the result from the local worker - it will be faster.
+    let promise = this.addCall(method, [...args, true]);
+    if (promise) {
+      promise
+        .then(() => {
+          this.warmWorkers++;
+          if (this.warmWorkers >= this.workers.size) {
+            this.emit('warmedup');
+          }
+        })
+        .catch(() => {});
+    }
+  }
+
+  shouldStartRemoteWorkers() {
+    return (
+      this.options.maxConcurrentWorkers > 1 ||
+      process.env.NODE_ENV === 'test' ||
+      !this.options.useLocalWorker
+    );
+  }
+
+  mkhandle(method) {
+    return (...args) => {
+      // Child process workers are slow to start (~600ms).
+      // While we're waiting, just run on the main thread.
+      // This significantly speeds up startup time.
+      if (this.shouldUseRemoteWorkers()) {
+        return this.addCall(method, [...args, false]);
+      } else {
+        if (this.options.warmWorkers && this.shouldStartRemoteWorkers()) {
+          this.warmupWorker(method, args);
+        }
+
+        return this.localWorker[method](...args, false);
+      }
+    };
+  }
+
+  onError(error, worker) {
+    // Handle ipc errors
+    if (error.code === 'ERR_IPC_CHANNEL_CLOSED') {
+      return this.stopWorker(worker);
+    }
+  }
+
+  startChild() {
+    let worker = new Worker(this.options);
+
+    worker.fork(this.options.workerPath, this.bundlerOptions);
+
+    worker.on('request', data => this.processRequest(data, worker));
+
+    worker.on('ready', () => this.processQueue());
+    worker.on('response', () => this.processQueue());
+
+    worker.on('error', err => this.onError(err, worker));
+    worker.once('exit', () => this.stopWorker(worker));
+
+    this.workers.set(worker.id, worker);
+  }
+
+  async stopWorker(worker) {
+    if (!worker.stopped) {
+      this.workers.delete(worker.id);
+
+      worker.isStopping = true;
+
+      if (worker.calls.size) {
+        for (let call of worker.calls.values()) {
+          call.retries++;
+          this.callQueue.unshift(call);
+        }
+      }
+
+      worker.calls = null;
+
+      await worker.stop();
+
+      // Process any requests that failed and start a new worker
+      this.processQueue();
+    }
+  }
+
+  async processQueue() {
+    if (this.ending || !this.callQueue.length) return;
+
+    if (this.workers.size < this.options.maxConcurrentWorkers) {
+      this.startChild();
+    }
+
+    for (let worker of this.workers.values()) {
+      if (!this.callQueue.length) {
+        break;
+      }
+
+      if (!worker.ready || worker.stopped || worker.isStopping) {
+        continue;
+      }
+
+      if (worker.calls.size < this.options.maxConcurrentCallsPerWorker) {
+        worker.call(this.callQueue.shift());
+      }
+    }
+  }
+
+  async processRequest(data, worker = false) {
+    let result = {
+      idx: data.idx,
+      type: 'response'
+    };
+
+    let method = data.method;
+    let args = data.args;
+    let location = data.location;
+    let awaitResponse = data.awaitResponse;
+
+    if (!location) {
+      throw new Error('Unknown request');
+    }
+
+    const mod = require(location);
+    try {
+      result.contentType = 'data';
+      if (method) {
+        result.content = await mod[method](...args);
+      } else {
+        result.content = await mod(...args);
+      }
+    } catch (e) {
+      result.contentType = 'error';
+      result.content = errorUtils.errorToJson(e);
+    }
+
+    if (awaitResponse) {
+      if (worker) {
+        worker.send(result);
+      } else {
+        return result;
+      }
+    }
+  }
+
+  addCall(method, args) {
+    if (this.ending) {
+      throw new Error('Cannot add a worker call if workerfarm is ending.');
+    }
+
+    return new Promise((resolve, reject) => {
+      this.callQueue.push({
+        method,
+        args: args,
+        retries: 0,
+        resolve,
+        reject
+      });
+      this.processQueue();
+    });
+  }
+
+  async end() {
+    this.ending = true;
+    await Promise.all(
+      Array.from(this.workers.values()).map(worker => this.stopWorker(worker))
+    );
+    this.ending = false;
+    shared = null;
+  }
+
+  init(bundlerOptions) {
+    this.bundlerOptions = bundlerOptions;
+
+    if (this.shouldStartRemoteWorkers()) {
+      this.persistBundlerOptions();
+    }
+
+    this.localWorker.init(bundlerOptions);
+    this.startMaxWorkers();
+  }
+
+  persistBundlerOptions() {
+    for (let worker of this.workers.values()) {
+      worker.init(this.bundlerOptions);
+    }
+  }
+
+  startMaxWorkers() {
+    // Starts workers untill the maximum is reached
+    if (this.workers.size < this.options.maxConcurrentWorkers) {
+      for (
+        let i = 0;
+        i < this.options.maxConcurrentWorkers - this.workers.size;
+        i++
+      ) {
+        this.startChild();
+      }
+    }
+  }
+
+  shouldUseRemoteWorkers() {
+    return (
+      !this.options.useLocalWorker ||
+      (this.warmWorkers >= this.workers.size || !this.options.warmWorkers)
+    );
+  }
+
+  static async getShared(options, farmOptions) {
+    // Farm options shouldn't be considered safe to overwrite
+    // and require an entire new instance to be created
+    if (shared && farmOptions) {
+      await shared.end();
+      shared = null;
+    }
+
+    if (!shared) {
+      shared = new WorkerFarm(options, farmOptions);
+    } else if (options) {
+      shared.init(options);
+    }
+
+    if (!shared && !options) {
+      throw new Error('Workerfarm should be initialised using options');
+    }
+
+    return shared;
+  }
+
+  static getNumWorkers() {
+    return process.env.PARCEL_WORKERS
+      ? parseInt(process.env.PARCEL_WORKERS, 10)
+      : cpuCount();
+  }
+
+  static async callMaster(request, awaitResponse = true) {
+    if (WorkerFarm.isWorker()) {
+      const child = require('./child');
+      return child.addCall(request, awaitResponse);
+    } else {
+      return (await WorkerFarm.getShared()).processRequest(request);
+    }
+  }
+
+  static isWorker() {
+    return process.send && require.main.filename === require.resolve('./child');
+  }
+
+  static getConcurrentCallsPerWorker() {
+    return parseInt(process.env.PARCEL_MAX_CONCURRENT_CALLS, 10) || 5;
+  }
+}
+
+module.exports = WorkerFarm;

BACK_BACK/node_modules/@parcel/workers/src/child.js

@@ -0,0 +1,144 @@
+const {errorUtils} = require('@parcel/utils');
+
+class Child {
+  constructor() {
+    if (!process.send) {
+      throw new Error('Only create Child instances in a worker!');
+    }
+
+    this.module = undefined;
+    this.childId = undefined;
+
+    this.callQueue = [];
+    this.responseQueue = new Map();
+    this.responseId = 0;
+    this.maxConcurrentCalls = 10;
+  }
+
+  messageListener(data) {
+    if (data === 'die') {
+      return this.end();
+    }
+
+    let type = data.type;
+    if (type === 'response') {
+      return this.handleResponse(data);
+    } else if (type === 'request') {
+      return this.handleRequest(data);
+    }
+  }
+
+  async send(data) {
+    process.send(data, err => {
+      if (err && err instanceof Error) {
+        if (err.code === 'ERR_IPC_CHANNEL_CLOSED') {
+          // IPC connection closed
+          // no need to keep the worker running if it can't send or receive data
+          return this.end();
+        }
+      }
+    });
+  }
+
+  childInit(module, childId) {
+    this.module = require(module);
+    this.childId = childId;
+  }
+
+  async handleRequest(data) {
+    let idx = data.idx;
+    let child = data.child;
+    let method = data.method;
+    let args = data.args;
+
+    let result = {idx, child, type: 'response'};
+    try {
+      result.contentType = 'data';
+      if (method === 'childInit') {
+        result.content = this.childInit(...args, child);
+      } else {
+        result.content = await this.module[method](...args);
+      }
+    } catch (e) {
+      result.contentType = 'error';
+      result.content = errorUtils.errorToJson(e);
+    }
+
+    this.send(result);
+  }
+
+  async handleResponse(data) {
+    let idx = data.idx;
+    let contentType = data.contentType;
+    let content = data.content;
+    let call = this.responseQueue.get(idx);
+
+    if (contentType === 'error') {
+      call.reject(errorUtils.jsonToError(content));
+    } else {
+      call.resolve(content);
+    }
+
+    this.responseQueue.delete(idx);
+
+    // Process the next call
+    this.processQueue();
+  }
+
+  // Keep in mind to make sure responses to these calls are JSON.Stringify safe
+  async addCall(request, awaitResponse = true) {
+    let call = request;
+    call.type = 'request';
+    call.child = this.childId;
+    call.awaitResponse = awaitResponse;
+
+    let promise;
+    if (awaitResponse) {
+      promise = new Promise((resolve, reject) => {
+        call.resolve = resolve;
+        call.reject = reject;
+      });
+    }
+
+    this.callQueue.push(call);
+    this.processQueue();
+
+    return promise;
+  }
+
+  async sendRequest(call) {
+    let idx;
+    if (call.awaitResponse) {
+      idx = this.responseId++;
+      this.responseQueue.set(idx, call);
+    }
+    this.send({
+      idx: idx,
+      child: call.child,
+      type: call.type,
+      location: call.location,
+      method: call.method,
+      args: call.args,
+      awaitResponse: call.awaitResponse
+    });
+  }
+
+  async processQueue() {
+    if (!this.callQueue.length) {
+      return;
+    }
+
+    if (this.responseQueue.size < this.maxConcurrentCalls) {
+      this.sendRequest(this.callQueue.shift());
+    }
+  }
+
+  end() {
+    process.exit();
+  }
+}
+
+let child = new Child();
+process.on('message', child.messageListener.bind(child));
+
+module.exports = child;

BACK_BACK/node_modules/@parcel/workers/src/cpuCount.js

@@ -0,0 +1,11 @@
+const os = require('os');
+
+module.exports = function() {
+  let cores;
+  try {
+    cores = require('physical-cpu-count');
+  } catch (err) {
+    cores = os.cpus().length;
+  }
+  return cores || 1;
+};

BACK_BACK/node_modules/@parcel/workers/test/.babelrc

@@ -0,0 +1,9 @@
+{
+  "presets": [["@babel/preset-env", {
+    "targets": {
+      "node": "current"
+    }
+  }]],
+  "plugins": ["@babel/plugin-transform-runtime"],
+  "ignore": ["integration"]
+}

BACK_BACK/node_modules/@parcel/workers/test/.eslintrc.json

@@ -0,0 +1,6 @@
+{
+  "extends": "../../../../.eslintrc.json",
+  "env": {
+    "mocha": true
+  }
+}

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/echo.js

@@ -0,0 +1,10 @@
+function run(data) {
+  return data;
+}
+
+function init() {
+  // do nothing
+}
+
+exports.run = run;
+exports.init = init;

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/init.js

@@ -0,0 +1,12 @@
+let options = {};
+
+function run() {
+  return options;
+}
+
+function init(opt) {
+  options = opt;
+}
+
+exports.run = run;
+exports.init = init;

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/ipc-pid.js

@@ -0,0 +1,25 @@
+const WorkerFarm = require(`../../../${
+  parseInt(process.versions.node, 10) < 8 ? 'lib' : 'src'
+}/WorkerFarm`);
+
+function run() {
+  let result = [process.pid];
+  return new Promise((resolve, reject) => {
+    WorkerFarm.callMaster({
+      location: require.resolve('./master-process-id.js'),
+      args: []
+    })
+      .then(pid => {
+        result.push(pid);
+        resolve(result);
+      })
+      .catch(reject);
+  });
+}
+
+function init() {
+  // Do nothing
+}
+
+exports.run = run;
+exports.init = init;

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/ipc.js

@@ -0,0 +1,17 @@
+const WorkerFarm = require(`../../../${
+  parseInt(process.versions.node, 10) < 8 ? 'lib' : 'src'
+}/WorkerFarm`);
+
+function run(a, b) {
+  return WorkerFarm.callMaster({
+    location: require.resolve('./master-sum.js'),
+    args: [a, b]
+  });
+}
+
+function init() {
+  // Do nothing
+}
+
+exports.run = run;
+exports.init = init;

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/master-process-id.js

@@ -0,0 +1,3 @@
+module.exports = function() {
+  return process.pid;
+};

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/master-sum.js

@@ -0,0 +1,3 @@
+module.exports = function(a, b) {
+  return a + b;
+};

BACK_BACK/node_modules/@parcel/workers/test/integration/workerfarm/ping.js

@@ -0,0 +1,10 @@
+function run() {
+  return 'pong';
+}
+
+function init() {
+  // do nothing
+}
+
+exports.run = run;
+exports.init = init;

BACK_BACK/node_modules/@parcel/workers/test/mocha.opts

@@ -0,0 +1,3 @@
+--require @parcel/babel-register
+--exit
+--timeout 20s

BACK_BACK/node_modules/@parcel/workers/test/workerfarm.js

@@ -0,0 +1,178 @@
+const assert = require('assert');
+const WorkerFarm = require('../index');
+
+describe('WorkerFarm', () => {
+  it('Should start up workers', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: false,
+        useLocalWorker: false,
+        workerPath: require.resolve('./integration/workerfarm/ping.js')
+      }
+    );
+
+    assert.equal(await workerfarm.run(), 'pong');
+
+    await workerfarm.end();
+  });
+
+  it('Should handle 1000 requests without any issue', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: false,
+        useLocalWorker: false,
+        workerPath: require.resolve('./integration/workerfarm/echo.js')
+      }
+    );
+
+    let promises = [];
+    for (let i = 0; i < 1000; i++) {
+      promises.push(workerfarm.run(i));
+    }
+    await Promise.all(promises);
+
+    await workerfarm.end();
+  });
+
+  it('Should consistently initialise workers, even after 100 re-inits', async () => {
+    let options = {
+      key: 0
+    };
+
+    let workerfarm = new WorkerFarm(options, {
+      warmWorkers: false,
+      useLocalWorker: false,
+      workerPath: require.resolve('./integration/workerfarm/init.js')
+    });
+
+    for (let i = 0; i < 100; i++) {
+      options.key = i;
+      workerfarm.init(options);
+
+      for (let i = 0; i < workerfarm.workers.size; i++) {
+        assert.equal((await workerfarm.run()).key, options.key);
+      }
+      assert.equal(workerfarm.shouldUseRemoteWorkers(), true);
+    }
+
+    await workerfarm.end();
+  });
+
+  it('Should warm up workers', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: true,
+        useLocalWorker: true,
+        workerPath: require.resolve('./integration/workerfarm/echo.js')
+      }
+    );
+
+    for (let i = 0; i < 100; i++) {
+      assert.equal(await workerfarm.run(i), i);
+    }
+
+    await new Promise(resolve => workerfarm.once('warmedup', resolve));
+
+    assert(workerfarm.workers.size > 0, 'Should have spawned workers.');
+    assert(
+      workerfarm.warmWorkers >= workerfarm.workers.size,
+      'Should have warmed up workers.'
+    );
+
+    await workerfarm.end();
+  });
+
+  it('Should use the local worker', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: true,
+        useLocalWorker: true,
+        workerPath: require.resolve('./integration/workerfarm/echo.js')
+      }
+    );
+
+    assert.equal(await workerfarm.run('hello world'), 'hello world');
+    assert.equal(workerfarm.shouldUseRemoteWorkers(), false);
+
+    await workerfarm.end();
+  });
+
+  it('Should be able to use bi-directional communication', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: false,
+        useLocalWorker: false,
+        workerPath: require.resolve('./integration/workerfarm/ipc.js')
+      }
+    );
+
+    assert.equal(await workerfarm.run(1, 2), 3);
+
+    await workerfarm.end();
+  });
+
+  it('Should be able to handle 1000 bi-directional calls', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: false,
+        useLocalWorker: false,
+        workerPath: require.resolve('./integration/workerfarm/ipc.js')
+      }
+    );
+
+    for (let i = 0; i < 1000; i++) {
+      assert.equal(await workerfarm.run(1 + i, 2), 3 + i);
+    }
+
+    await workerfarm.end();
+  });
+
+  it('Bi-directional call should return masters pid', async () => {
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: false,
+        useLocalWorker: false,
+        workerPath: require.resolve('./integration/workerfarm/ipc-pid.js')
+      }
+    );
+
+    let result = await workerfarm.run();
+    assert.equal(result.length, 2);
+    assert.equal(result[1], process.pid);
+    assert.notEqual(result[0], process.pid);
+
+    await workerfarm.end();
+  });
+
+  it('Should handle 10 big concurrent requests without any issue', async () => {
+    // This emulates the node.js ipc bug for win32
+    let workerfarm = new WorkerFarm(
+      {},
+      {
+        warmWorkers: false,
+        useLocalWorker: false,
+        workerPath: require.resolve('./integration/workerfarm/echo.js')
+      }
+    );
+
+    let bigData = [];
+    for (let i = 0; i < 10000; i++) {
+      bigData.push('This is some big data');
+    }
+
+    let promises = [];
+    for (let i = 0; i < 10; i++) {
+      promises.push(workerfarm.run(bigData));
+    }
+    await Promise.all(promises);
+
+    await workerfarm.end();
+  });
+});