[now dev] Add logging of the builder package versions (#2125)

* [now dev] Add logging of the builder package versions

To aid in debugging errors reported by users.

* Remove bad

src/commands/dev/lib/builder-cache.ts

@@ -9,13 +9,17 @@ import cacheDirectory from 'cache-or-tmp-directory';
 import wait from '../../../util/output/wait';
 import { Output } from '../../../util/output';
 import { devDependencies as nowCliDeps } from '../../../../package.json';
-import { Builder } from './types';
+import { Builder, PACKAGE } from './types';
 import {
   NoBuilderCacheError,
   BuilderCacheCleanError
 } from '../../../util/errors-ts';
 
-import * as staticBuilder from './static-builder';
+import * as _staticBuilder from './static-builder';
+const staticBuilder: Builder = _staticBuilder;
+staticBuilder[PACKAGE] = {
+  version: 'built-in'
+};
 
 const localBuilders: { [key: string]: Builder } = {
   '@now/static': staticBuilder
@@ -143,6 +147,7 @@ export async function getBuilder(builderPkg: string): Promise<Builder> {
     const parsed = npa(builderPkg);
     const dest = join(cacheDir, 'node_modules', parsed.name || builderPkg);
     builder = require(dest);
+    builder[PACKAGE] = require(join(dest, 'package.json'));
   }
   return builder;
 }

src/commands/dev/lib/dev-builder.ts

@@ -14,6 +14,7 @@ import IGNORED from '../../../util/ignored';
 import { LambdaSizeExceededError } from '../../../util/errors-ts';
 import { installBuilders, getBuilder } from './builder-cache';
 import {
+  PACKAGE,
   NowConfig,
   BuildConfig,
   BuildSubscription,
@@ -104,16 +105,21 @@ export async function executeBuild(
   if (buildConfig.builderCachePromise) {
     devServer.output.debug('Restoring build cache from previous build');
     const builderCache = await buildConfig.builderCachePromise;
+    const startTime = Date.now();
     await download(builderCache, workPath);
+    const cacheRestoreTime = Date.now() - startTime;
+    devServer.output.debug(`Restoring build cache took ${cacheRestoreTime}ms`);
   }
 
-  devServer.output.debug(
-    `Building ${buildEntry.fsPath} (workPath = ${workPath})`
-  );
   const { builder } = buildConfig;
   if (!builder) {
     throw new Error('No builder');
   }
+  devServer.output.debug(
+    `Building ${buildEntry.fsPath} with "${buildConfig.use}" v${
+      builder[PACKAGE]!.version
+    } (workPath = ${workPath})`
+  );
   const builderConfig = builder.config || {};
   const files = await collectProjectFiles('**', cwd);
   const config = buildConfig.config || {};
@@ -267,7 +273,9 @@ async function executeBuilds(
             continue;
           } else {
             devServer.output.debug(
-              `Building ${entry.fsPath} (workPath = ${workPath})`
+              `Building ${entry.fsPath} with "${build.use}" v${
+                builder[PACKAGE]!.version
+              } (workPath = ${workPath})`
             );
             output = await builder.build({ ...buildConfig, workPath });
 

src/commands/dev/lib/types.ts

@@ -3,6 +3,8 @@ import { Output } from '../../../util/output';
 import { Lambda as FunLambda } from '@zeit/fun';
 import { FileBlob, FileFsRef, Lambda } from '@now/build-utils';
 
+export const PACKAGE = Symbol('package.json');
+
 export enum DevServerStatus {
   busy,
   idle,
@@ -109,6 +111,9 @@ export interface Builder {
   prepareCache?(
     params: PrepareCacheParams
   ): CacheOutputs | Promise<CacheOutputs>;
+  [PACKAGE]?: {
+    version: string;
+  };
 }
 
 export interface HttpHeadersConfig {