v6

node_modules/jest-worker/build/workers/threadChild.js

@@ -0,0 +1,176 @@
+'use strict';
+
+function _worker_threads() {
+  const data = require('worker_threads');
+
+  _worker_threads = function _worker_threads() {
+    return data;
+  };
+
+  return data;
+}
+
+var _types = require('../types');
+
+function _objectSpread(target) {
+  for (var i = 1; i < arguments.length; i++) {
+    var source = arguments[i] != null ? arguments[i] : {};
+    var ownKeys = Object.keys(source);
+    if (typeof Object.getOwnPropertySymbols === 'function') {
+      ownKeys = ownKeys.concat(
+        Object.getOwnPropertySymbols(source).filter(function(sym) {
+          return Object.getOwnPropertyDescriptor(source, sym).enumerable;
+        })
+      );
+    }
+    ownKeys.forEach(function(key) {
+      _defineProperty(target, key, source[key]);
+    });
+  }
+  return target;
+}
+
+function _defineProperty(obj, key, value) {
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+
+let file = null;
+let setupArgs = [];
+let initialized = false;
+/**
+ * This file is a small bootstrapper for workers. It sets up the communication
+ * between the worker and the parent process, interpreting parent messages and
+ * sending results back.
+ *
+ * The file loaded will be lazily initialized the first time any of the workers
+ * is called. This is done for optimal performance: if the farm is initialized,
+ * but no call is made to it, child Node processes will be consuming the least
+ * possible amount of memory.
+ *
+ * If an invalid message is detected, the child will exit (by throwing) with a
+ * non-zero exit code.
+ */
+
+_worker_threads().parentPort.on('message', request => {
+  switch (request[0]) {
+    case _types.CHILD_MESSAGE_INITIALIZE:
+      const init = request;
+      file = init[2];
+      setupArgs = request[3];
+      break;
+
+    case _types.CHILD_MESSAGE_CALL:
+      const call = request;
+      execMethod(call[2], call[3]);
+      break;
+
+    case _types.CHILD_MESSAGE_END:
+      end();
+      break;
+
+    default:
+      throw new TypeError(
+        'Unexpected request from parent process: ' + request[0]
+      );
+  }
+});
+
+function reportSuccess(result) {
+  if (_worker_threads().isMainThread) {
+    throw new Error('Child can only be used on a forked process');
+  }
+
+  _worker_threads().parentPort.postMessage([_types.PARENT_MESSAGE_OK, result]);
+}
+
+function reportClientError(error) {
+  return reportError(error, _types.PARENT_MESSAGE_CLIENT_ERROR);
+}
+
+function reportInitializeError(error) {
+  return reportError(error, _types.PARENT_MESSAGE_SETUP_ERROR);
+}
+
+function reportError(error, type) {
+  if (_worker_threads().isMainThread) {
+    throw new Error('Child can only be used on a forked process');
+  }
+
+  if (error == null) {
+    error = new Error('"null" or "undefined" thrown');
+  }
+
+  _worker_threads().parentPort.postMessage([
+    type,
+    error.constructor && error.constructor.name,
+    error.message,
+    error.stack,
+    typeof error === 'object' ? _objectSpread({}, error) : error
+  ]);
+}
+
+function end() {
+  const main = require(file);
+
+  if (!main.teardown) {
+    exitProcess();
+    return;
+  }
+
+  execFunction(main.teardown, main, [], exitProcess, exitProcess);
+}
+
+function exitProcess() {
+  process.exit(0);
+}
+
+function execMethod(method, args) {
+  const main = require(file);
+
+  let fn;
+
+  if (method === 'default') {
+    fn = main.__esModule ? main['default'] : main;
+  } else {
+    fn = main[method];
+  }
+
+  function execHelper() {
+    execFunction(fn, main, args, reportSuccess, reportClientError);
+  }
+
+  if (initialized || !main.setup) {
+    execHelper();
+    return;
+  }
+
+  initialized = true;
+  execFunction(main.setup, main, setupArgs, execHelper, reportInitializeError);
+}
+
+function execFunction(fn, ctx, args, onResult, onError) {
+  let result;
+
+  try {
+    result = fn.apply(ctx, args);
+  } catch (err) {
+    onError(err);
+    return;
+  }
+
+  if (result && typeof result.then === 'function') {
+    result.then(onResult, onError);
+  } else {
+    onResult(result);
+  }
+}