re-add the hasteImpl

Author: kelset

jest/hasteImpl.js

@@ -0,0 +1,97 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow
+ */
+
+'use strict';
+
+const path = require('path');
+const cli = require('@react-native-community/cli');
+
+// Use duck-typing because of Facebook-internal infra that doesn't have the cli package.
+const {haste} = (cli.loadConfig && cli.loadConfig()) || {
+  haste: {
+    providesModuleNodeModules: [],
+    platforms: ['ios', 'android'],
+  },
+};
+
+// Detect out-of-tree platforms and add them to the whitelists
+const pluginRoots /*: Array<string> */ = haste.providesModuleNodeModules.map(
+  name => path.resolve(__dirname, '../../', name) + path.sep,
+);
+
+const pluginNameReducers /*: Array<[RegExp, string]> */ = haste.platforms.map(
+  name => [new RegExp(`^(.*)\\.(${name})$`), '$1'],
+);
+
+const ROOTS = [path.resolve(__dirname, '..') + path.sep, ...pluginRoots];
+
+const BLACKLISTED_PATTERNS /*: Array<RegExp> */ = [
+  /.*[\\\/]__(mocks|tests)__[\\\/].*/,
+  /^Libraries[\\\/]Animated[\\\/]src[\\\/]polyfills[\\\/].*/,
+  /^Libraries[\\\/]Renderer[\\\/]fb[\\\/].*/,
+  /DerivedData[\\\/].*/,
+];
+
+const WHITELISTED_PREFIXES /*: Array<string> */ = [
+  'IntegrationTests',
+  'Libraries',
+  'ReactAndroid',
+  'RNTester',
+];
+
+const NAME_REDUCERS /*: Array<[RegExp, string]> */ = [
+  // extract basename
+  [/^(?:.*[\\\/])?([a-zA-Z0-9$_.-]+)$/, '$1'],
+  // strip .js/.js.flow suffix
+  [/^(.*)\.js(\.flow)?$/, '$1'],
+  // strip native suffix
+  [/^(.*)\.(native)$/, '$1'],
+  // strip plugin platform suffixes
+  ...pluginNameReducers,
+];
+
+function isHastePath(filePath /*: string */) /*: boolean */ {
+  if (!filePath.endsWith('.js') && !filePath.endsWith('.js.flow')) {
+    return false;
+  }
+
+  const root = ROOTS.find(r => filePath.startsWith(r));
+  if (!root) {
+    return false;
+  }
+
+  filePath = filePath.substr(root.length);
+  if (BLACKLISTED_PATTERNS.some(pattern => pattern.test(filePath))) {
+    return false;
+  }
+  return WHITELISTED_PREFIXES.some(prefix => filePath.startsWith(prefix));
+}
+
+module.exports = {
+  /*
+   * @return {string|void} hasteName for module at filePath; or undefined if
+   *                       filePath is not a haste module
+   */
+  getHasteName(
+    filePath /*: string */,
+    sourceCode /*: ?string */,
+  ) /*: string | void */ {
+    if (!isHastePath(filePath)) {
+      return undefined;
+    }
+
+    const hasteName = NAME_REDUCERS.reduce(
+      (name, [pattern, replacement]) => name.replace(pattern, replacement),
+      filePath,
+    );
+
+    return hasteName;
+  },
+};