Add minifier-path option to Metro

Summary:
This exposes the `minifierPath` externally and allows it to be adjusted through the `--minifier-path` argument.

This works for both the server (when starting the server) and running a single build through the CLI.

In server mode, this can not be used per file request yet, though that should also be doable if need be.

Reviewed By: rafeca

Differential Revision: D6998562

fbshipit-source-id: 669b876c24fe117ec88b2200d48aa82658f568b4

packages/metro/src/Bundler/index.js

@@ -89,6 +89,7 @@ export type Options = {|
   +globalTransformCache: ?GlobalTransformCache,
   +hasteImplModulePath?: string,
   +maxWorkers: number,
+  +minifierPath: string,
   +platforms: Array<string>,
   +polyfillModuleNames: Array<string>,
   +postMinifyProcess: PostMinifyProcess,
@@ -120,8 +121,7 @@ class Bundler {
     this._transformer = new Transformer({
       asyncRequireModulePath: opts.asyncRequireModulePath,
       maxWorkers: opts.maxWorkers,
-      // TODO t26063242 make this an option
-      minifierPath: defaults.DEFAULT_METRO_MINIFIER_PATH,
+      minifierPath: opts.minifierPath,
       reporters: {
         stdoutChunk: chunk =>
           opts.reporter.update({type: 'worker_stdout_chunk', chunk}),

packages/metro/src/DeltaBundler/__tests__/DeltaTransformer-test.js

@@ -33,6 +33,7 @@ const bundlerOptions = {
   cacheVersion: 'smth',
   enableBabelRCLookup: true,
   extraNodeModules: {},
+  minifierPath: defaults.DEFAULT_METRO_MINIFIER_PATH,
   platforms: defaults.platforms,
   resetCache: false,
   sourceExts: defaults.sourceExts,

packages/metro/src/Server/index.js

@@ -28,6 +28,7 @@ const symbolicate = require('./symbolicate');
 const url = require('url');
 
 const {getAsset} = require('../Assets');
+const resolveSync: ResolveSync = require('resolve').sync;
 
 import type {CustomError} from '../lib/formatBundlingError';
 import type {IncomingMessage, ServerResponse} from 'http';
@@ -49,6 +50,8 @@ const {
   Logger: {createActionStartEntry, createActionEndEntry, log},
 } = require('metro-core');
 
+type ResolveSync = (path: string, opts: ?{baseDir?: string}) => string;
+
 function debounceAndBatch(fn, delay) {
   let timeout;
   return () => {
@@ -71,6 +74,7 @@ class Server {
     getTransformOptions?: GetTransformOptions,
     hasteImplModulePath?: string,
     maxWorkers: number,
+    minifierPath: string,
     moduleFormat: string,
     platforms: Array<string>,
     polyfillModuleNames: Array<string>,
@@ -127,6 +131,10 @@ class Server {
       globalTransformCache: options.globalTransformCache,
       hasteImplModulePath: options.hasteImplModulePath,
       maxWorkers,
+      minifierPath:
+        options.minifierPath == null
+          ? defaults.DEFAULT_METRO_MINIFIER_PATH
+          : resolveSync(options.minifierPath, {basedir: process.cwd()}),
       moduleFormat:
         options.moduleFormat != null ? options.moduleFormat : 'haste',
       platforms: options.platforms || defaults.platforms,

packages/metro/src/index.js

@@ -49,6 +49,7 @@ type PublicMetroOptions = {|
   config?: ConfigT,
   globalTransformCache?: ?GlobalTransformCache,
   maxWorkers?: number,
+  minifierPath?: string,
   port?: ?number,
   reporter?: Reporter,
   transformCache?: TransformCache,
@@ -86,6 +87,7 @@ async function runMetro({
   globalTransformCache,
   resetCache = false,
   maxWorkers = getMaxWorkers(),
+  minifierPath,
   // $FlowFixMe TODO t0 https://github.com/facebook/flow/issues/183
   port = null,
   reporter = new TerminalReporter(new Terminal(process.stdout)),
@@ -133,6 +135,7 @@ async function runMetro({
     globalTransformCache,
     hasteImplModulePath: normalizedConfig.hasteImplModulePath,
     maxWorkers,
+    minifierPath,
     platforms: defaults.platforms.concat(platforms),
     postMinifyProcess: normalizedConfig.postMinifyProcess,
     postProcessModules: normalizedConfig.postProcessModules,
@@ -208,6 +211,7 @@ type RunServerOptions = {|
 exports.runServer = async ({
   host,
   onReady,
+  minifierPath,
   // $FlowFixMe Flow messes up when using "destructuring"+"default value"+"spread typing"+"stricter field typing" together
   port = 8080,
   reporter = new TerminalReporter(new Terminal(process.stdout)),
@@ -231,6 +235,7 @@ exports.runServer = async ({
     ...rest,
     port,
     reporter,
+    minifierPath,
   });
 
   serverApp.use(middleware);

packages/metro/src/legacy.js

@@ -183,6 +183,7 @@ function toServerOptions(options: Options): ServerOptions {
     globalTransformCache: options.globalTransformCache,
     hasteImplModulePath: options.hasteImplModulePath,
     maxWorkers: options.maxWorkers,
+    minifierPath: options.minifierPath,
     moduleFormat: options.moduleFormat,
     platforms: options.platforms,
     polyfillModuleNames: options.polyfillModuleNames,

packages/metro/src/shared/types.flow.js

@@ -83,6 +83,7 @@ export type Options = {|
   globalTransformCache: ?GlobalTransformCache,
   hasteImplModulePath?: string,
   maxWorkers?: number,
+  minifierPath?: string,
   moduleFormat?: string,
   platforms?: Array<string>,
   polyfillModuleNames?: Array<string>,