Merge pull request #7768 from telamonian/no-dup-check-in-watch

watch mode: reduces noise in console output by disabling pkg duplicate checker

buildutils/package.json

@@ -44,6 +44,7 @@
     "commander": "~4.0.1",
     "crypto": "~1.0.1",
     "dependency-graph": "^0.8.1",
+    "duplicate-package-checker-webpack-plugin": "^3.0.0",
     "fs-extra": "^8.1.0",
     "glob": "~7.1.6",
     "inquirer": "^7.0.0",
@@ -57,6 +58,7 @@
     "webpack": "^4.41.2"
   },
   "devDependencies": {
+    "@types/duplicate-package-checker-webpack-plugin": "^2.1.0",
     "@types/fs-extra": "^8.0.1",
     "@types/glob": "^7.1.1",
     "@types/inquirer": "^6.5.0",

buildutils/src/webpack-plugins.ts

@@ -3,8 +3,9 @@
 | Distributed under the terms of the Modified BSD License.
 |----------------------------------------------------------------------------*/
 
-import * as webpack from 'webpack';
+import DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin');
 import * as fs from 'fs-extra';
+import * as webpack from 'webpack';
 
 export namespace WPPlugin {
   /**
@@ -171,4 +172,20 @@ export namespace WPPlugin {
 
     ignored: (path: string) => boolean;
   }
+
+  export class NowatchDuplicatePackageCheckerPlugin extends DuplicatePackageCheckerPlugin {
+    apply(compiler: any) {
+      const options = this.options;
+
+      compiler.hooks.run.tap(
+        'NowatchDuplicatePackageCheckerPlugin',
+        (compiler: any) => {
+          const p = new DuplicatePackageCheckerPlugin(options);
+          p.apply(compiler);
+        }
+      );
+    }
+
+    options: DuplicatePackageCheckerPlugin.Options;
+  }
 }

dev_mode/webpack.config.js

@@ -8,7 +8,6 @@ var fs = require('fs-extra');
 var Handlebars = require('handlebars');
 var HtmlWebpackPlugin = require('html-webpack-plugin');
 var webpack = require('webpack');
-var DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin');
 var BundleAnalyzerPlugin = require('webpack-bundle-analyzer')
   .BundleAnalyzerPlugin;
 
@@ -122,7 +121,7 @@ function ignored(path) {
 }
 
 const plugins = [
-  new DuplicatePackageCheckerPlugin({
+  new WPPlugin.NowatchDuplicatePackageCheckerPlugin({
     verbose: true,
     exclude(instance) {
       // ignore known duplicates
@@ -137,7 +136,6 @@ const plugins = [
     title: jlab.name || 'JupyterLab'
   }),
   new webpack.HashedModuleIdsPlugin(),
-
   // custom plugin for ignoring files during a `--watch` build
   new WPPlugin.FilterWatchIgnorePlugin(ignored),
   // custom plugin that copies the assets to the static directory
@@ -223,9 +221,6 @@ module.exports = [
     bail: true,
     devtool: 'inline-source-map',
     externals: ['node-fetch', 'ws'],
-    plugins,
-    stats: {
-      chunkModules: true
-    }
+    plugins
   }
 ].concat(extraConfig);

yarn.lock

@@ -2719,6 +2719,13 @@
   dependencies:
     "@types/domhandler" "*"
 
+"@types/duplicate-package-checker-webpack-plugin@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@types/duplicate-package-checker-webpack-plugin/-/duplicate-package-checker-webpack-plugin-2.1.0.tgz#02f030a6432274b16529e434d5ea696024f363b2"
+  integrity sha512-lS1AUw32mjdqhObsY2lxzo5qWeFnMZmhAVmh+rHbXdsxIE8cFMIA37NtIDXxkLhFLvF1ua/C5rcMsGumhpGFuA==
+  dependencies:
+    "@types/webpack" "*"
+
 "@types/estree@*":
   version "0.0.41"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.41.tgz#fd90754150b57432b72bf560530500597ff04421"