packager worker: enable possibility to add Flow annotations

Reviewed By: matryoshcow

Differential Revision: D4160456

fbshipit-source-id: bbc2420126d8e8b725c0b7b359b35f09dfe8c8d6

react-packager/src/JSTransformer/worker/index.js

@@ -6,99 +6,11 @@
  * LICENSE file in the root directory of this source tree. An additional grant
  * of patent rights can be found in the PATENTS file in the same directory.
  */
+
 'use strict';
 
-const constantFolding = require('./constant-folding');
-const extractDependencies = require('./extract-dependencies');
-const inline = require('./inline');
-const minify = require('./minify');
-
-function makeTransformParams(filename, sourceCode, options) {
-  if (filename.endsWith('.json')) {
-    sourceCode = 'module.exports=' + sourceCode;
-  }
-  return {filename, sourceCode, options};
-}
-
-function transformCode(transform, filename, sourceCode, options, callback) {
-  const params = makeTransformParams(filename, sourceCode, options.transform);
-  const isJson = filename.endsWith('.json');
-
-  const transformFileStartLogEntry = {
-    action_name: 'Transforming file',
-    action_phase: 'start',
-    file_name: filename,
-    log_entry_label: 'Transforming file',
-    start_timestamp: process.hrtime(),
-  };
-
-  transform(params, (error, transformed) => {
-    if (error) {
-      callback(error);
-      return;
-    }
-
-    var code, map;
-    if (options.minify) {
-      const optimized =
-        constantFolding(filename, inline(filename, transformed, options));
-      code = optimized.code;
-      map = optimized.map;
-    } else {
-      code = transformed.code;
-      map = transformed.map;
-    }
-
-    if (isJson) {
-      code = code.replace(/^\w+\.exports=/, '');
-    } else {
-      // Remove shebang
-      code = code.replace(/^#!.*/, '');
-    }
-
-    const result = isJson || options.extern
-      ? {dependencies: [], dependencyOffsets: []}
-      : extractDependencies(code);
-
-    const timeDelta = process.hrtime(transformFileStartLogEntry.start_timestamp);
-    const duration_ms = Math.round((timeDelta[0] * 1e9 + timeDelta[1]) / 1e6);
-    const transformFileEndLogEntry = {
-      action_name: 'Transforming file',
-      action_phase: 'end',
-      file_name: filename,
-      duration_ms: duration_ms,
-      log_entry_label: 'Transforming file',
-    };
-
-    result.code = code;
-    result.map = map;
-
-    return callback(null, {
-      result,
-      transformFileStartLogEntry,
-      transformFileEndLogEntry,
-    });
-  });
-}
-
-exports.transformAndExtractDependencies = (
-  transform,
-  filename,
-  sourceCode,
-  options,
-  callback
-) => {
-  transformCode(require(transform), filename, sourceCode, options || {}, callback);
-};
-
-exports.minify = (filename, code, sourceMap, callback) => {
-  var result;
-  try {
-    result = minify(filename, code, sourceMap);
-  } catch (error) {
-    callback(error);
-  }
-  callback(null, result);
-};
-
-exports.transformCode = transformCode; // for easier testing
+const path = require('path');
+require('../../../../babelRegisterOnly')([
+  path.resolve(path.join(__dirname, '../../**/*')),
+]);
+module.exports = require('./worker');

react-packager/src/JSTransformer/worker/worker.js

@@ -0,0 +1,141 @@
+/**
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @flow
+ */
+
+'use strict';
+
+const constantFolding = require('./constant-folding');
+const extractDependencies = require('./extract-dependencies');
+const inline = require('./inline');
+const minify = require('./minify');
+
+function makeTransformParams(filename, sourceCode, options) {
+  if (filename.endsWith('.json')) {
+    sourceCode = 'module.exports=' + sourceCode;
+  }
+  return {filename, sourceCode, options};
+}
+
+export type TransformedCode = {
+  code: string,
+  dependencies: Array<string>,
+  dependencyOffsets: Array<number>,
+  map?: ?{},
+};
+
+type Transform = (params: {
+  filename: string,
+  sourceCode: string,
+  options: ?{},
+}) => mixed;
+
+type Options = {transform?: {}};
+
+type Callback = (
+  error: ?Error,
+  data: ?{
+    result: TransformedCode,
+    transformFileStartLogEntry: {},
+    transformFileEndLogEntry: {},
+  },
+) => mixed;
+
+function transformCode(
+  transform: Transform,
+  filename: string,
+  sourceCode: string,
+  options: Options,
+  callback: Callback,
+) {
+  const params = makeTransformParams(filename, sourceCode, options.transform);
+  const isJson = filename.endsWith('.json');
+
+  const transformFileStartLogEntry = {
+    action_name: 'Transforming file',
+    action_phase: 'start',
+    file_name: filename,
+    log_entry_label: 'Transforming file',
+    start_timestamp: process.hrtime(),
+  };
+
+  transform(params, (error, transformed) => {
+    if (error) {
+      callback(error);
+      return;
+    }
+
+    var code, map;
+    if (options.minify) {
+      const optimized =
+        constantFolding(filename, inline(filename, transformed, options));
+      code = optimized.code;
+      map = optimized.map;
+    } else {
+      code = transformed.code;
+      map = transformed.map;
+    }
+
+    if (isJson) {
+      code = code.replace(/^\w+\.exports=/, '');
+    } else {
+      // Remove shebang
+      code = code.replace(/^#!.*/, '');
+    }
+
+    const depsResult = isJson || options.extern
+      ? {dependencies: [], dependencyOffsets: []}
+      : extractDependencies(code);
+
+    const timeDelta = process.hrtime(transformFileStartLogEntry.start_timestamp);
+    const duration_ms = Math.round((timeDelta[0] * 1e9 + timeDelta[1]) / 1e6);
+    const transformFileEndLogEntry = {
+      action_name: 'Transforming file',
+      action_phase: 'end',
+      file_name: filename,
+      duration_ms: duration_ms,
+      log_entry_label: 'Transforming file',
+    };
+
+    return callback(null, {
+      result: {...depsResult, code, map},
+      transformFileStartLogEntry,
+      transformFileEndLogEntry,
+    });
+  });
+}
+
+exports.transformAndExtractDependencies = (
+  transform: string,
+  filename: string,
+  sourceCode: string,
+  options: ?Options,
+  callback: Callback,
+) => {
+  /* $FlowFixMe: impossible to type a dynamic require */
+  const transformModule = require(transform);
+  transformCode(transformModule, filename, sourceCode, options || {}, callback);
+};
+
+exports.minify = (
+  filename: string,
+  code: string,
+  sourceMap: string,
+  callback: (error: ?Error, result: mixed) => mixed,
+) => {
+  var result;
+  try {
+    result = minify(filename, code, sourceMap);
+  } catch (error) {
+    callback(error);
+  }
+  callback(null, result);
+};
+
+exports.transformCode = transformCode; // for easier testing

react-packager/src/node-haste/Module.js

@@ -21,17 +21,11 @@ const jsonStableStringify = require('json-stable-stringify');
 
 const {join: joinPath, relative: relativePath, extname} = require('path');
 
+import type {TransformedCode} from '../JSTransformer/worker/worker';
 import type Cache from './Cache';
 import type ModuleCache from './ModuleCache';
 import type FastFs from './fastfs';
 
-type TransformedCode = {
-  code: string,
-  dependencies: Array<string>,
-  dependencyOffsets: Array<number>,
-  map?: ?{},
-};
-
 type ReadResult = {
   code?: string,
   dependencies?: ?Array<string>,