pass custom customTransformOptions and customResolverOptions to bundl…

…e_build_started log event (facebook#1061)

Summary:
We use `customTransformOptions` in Expo CLI to inform Metro that we're bundling for a Node.js environment (in addition to the `platform=web`), but the logger has no way of indicating to the user that a bundle is Server-specific. This change would enable us to refine the bundling message based on the additional criteria. We can do this if we skip over the server (exports/builds) but it'd be good to have parity. [Example usage](https://github.com/expo/expo/blob/e4eba8a7c9d8134c10578a47d39ddf5294aca9e4/packages/%40expo/cli/src/start/server/metro/MetroTerminalReporter.ts#L227), [corresponding output](https://github.com/expo/expo/blob/e4eba8a7c9d8134c10578a47d39ddf5294aca9e4/packages/%40expo/cli/src/start/server/metro/__tests__/MetroTerminalReporter-test.ts#L61).

Pull Request resolved: facebook#1061

Reviewed By: huntie

Differential Revision: D48454083

Pulled By: robhogan

fbshipit-source-id: 08954b89c9747adfb4db3899ce3f628edbf8e790

packages/metro/src/Server.js

@@ -698,6 +698,8 @@ class Server {
         buildID: getBuildID(buildNumber),
         bundleDetails: {
           bundleType: bundleOptions.bundleType,
+          customResolverOptions: bundleOptions.customResolverOptions,
+          customTransformOptions: bundleOptions.customTransformOptions,
           dev: transformOptions.dev,
           entryFile: resolvedEntryFilePath,
           minify: transformOptions.minify,

packages/metro/src/commands/build.js

@@ -119,6 +119,8 @@ module.exports = (): {
           type: 'bundle_build_started',
           bundleDetails: {
             bundleType: 'Bundle',
+            customResolverOptions: options.customResolverOptions ?? {},
+            customTransformOptions: options.customTransformOptions ?? {},
             dev: !!options.dev,
             entryFile: options.entry,
             minify: !!options.minify,

packages/metro/src/lib/reporting.js

@@ -11,6 +11,8 @@
 
 'use strict';
 
+import type {CustomResolverOptions} from 'metro-resolver';
+import type {CustomTransformOptions} from 'metro-transform-worker';
 import type {HealthCheckResult, WatcherStatus} from 'metro-file-map';
 import type {Terminal} from 'metro-core';
 
@@ -22,6 +24,8 @@ export type GlobalCacheDisabledReason = 'too_many_errors' | 'too_many_misses';
 
 export type BundleDetails = {
   bundleType: string,
+  customResolverOptions: CustomResolverOptions,
+  customTransformOptions: CustomTransformOptions,
   dev: boolean,
   entryFile: string,
   minify: boolean,