Webpack copies the NOTICE-js to the output folder and puts a header with url to the notice in every webpack file

NOTICE-js

@@ -12296,6 +12296,35 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
 
+------
+
+** object-hash; version 2.0.3 -- https://github.com/puleos/object-hash
+Copyright (c) 2014 object-hash contributors
+
+The MIT License (MIT)
+
+Copyright (c) 2014 object-hash contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+
+
 ------
 
 ** v8-compile-cache; version 2.0.3 -- https://github.com/zertosh/v8-compile-cache#readme

config/webpack/environment.js

@@ -1,7 +1,35 @@
-const { environment } = require('@rails/webpacker')
+const { environment, config } = require('@rails/webpacker')
 const ForkTsCheckerWebpackPlugin = require("fork-ts-checker-webpack-plugin");
+const webpack = require('webpack');
 const path = require("path");
 const erb = require('./loaders/erb')
+const fs = require('fs')
+const hash = require('object-hash')
+
+function getTerser() {
+  if(environment.config && 
+    environment.config.optimization && 
+    environment.config.optimization.minimizer && 
+    environment.config.optimization.minimizer instanceof Array &&
+    environment.config.optimization.minimizer.length === 1)
+    return environment.config.optimization.minimizer[0]
+  else 
+    return null;
+}
+
+function outputLicenseFile(file, outputDir) {
+	const contents = fs.readFileSync(file);
+	const name =  path.basename(file) + "-" + hash(contents) + ".txt";
+	if (!fs.existsSync(outputDir)) {
+		fs.mkdirSync(outputDir, {recursive: true});
+	}
+	fs.copyFileSync(file, path.join(outputDir, name));
+
+	return name;
+
+}
+
+
 
 environment.loaders.prepend('erb', erb)
 environment.plugins.append(
@@ -13,4 +41,21 @@ environment.plugins.append(
     async: false,
   })
 );
+
+environment.plugins.prepend("BannerPlugin", new webpack.BannerPlugin(
+  {banner: `@hlicense License information is available at ${config.publicPath}${outputLicenseFile('NOTICE-js', config.outputPath)}`,
+entryOnly: false}))
+
+
+const terser = getTerser()
+if (terser) {
+  terser.options.terserOptions = terser.options.terserOptions || {}
+  terser.options.terserOptions.output = terser.options.terserOptions.output || {} 
+  terser.options.terserOptions.output.comments = /@hlicense/i
+
+  // we don't want terser to print out license headers, we'll handle that ourselves
+  terser.options.extractComments = false;
+}
+
+
 module.exports = environment

config/webpack/production.js

@@ -1,7 +1,5 @@
 process.env.NODE_ENV = process.env.NODE_ENV || 'production'
-
 const environment = require('./environment')
-const modifyTerserPlugin = require('./plugins/modifyTerserPlugin');
 environment.splitChunks((config) => {
     const excludeDonateButtonFromSplit = {
         optimization:
@@ -21,7 +19,6 @@ environment.splitChunks((config) => {
     return Object.assign({}, config, excludeDonateButtonFromSplit)
 })
 
-// we don't want terser to print out license headers, we'll handle that ourselves
-environment.config.optimization.minimizer[0].options.extractComments = false;
+
 
 module.exports = environment.toWebpackConfig()

package.json

@@ -72,6 +72,7 @@
     "jsdom": "^11.10.0",
     "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.12.0",
+    "object-hash": "^2.0.3",
     "phantomjs-prebuilt": "^2.1.16",
     "react-test-renderer": "^16.13.1",
     "resolve-url-loader": "^2.3.0",

yarn.lock

@@ -11145,6 +11145,11 @@ object-copy@^0.1.0:
     define-property "^0.2.5"
     kind-of "^3.0.3"
 
+object-hash@^2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/object-hash/-/object-hash-2.0.3.tgz#d12db044e03cd2ca3d77c0570d87225b02e1e6ea"
+  integrity sha512-JPKn0GMu+Fa3zt3Bmr66JhokJU5BaNBIh4ZeTlaCBzrBsOeXzwcKKAK1tbLiPKgvwmPXsDvvLHoWh5Bm7ofIYg==
+
 object-inspect@^1.7.0:
   version "1.8.0"
   resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.8.0.tgz#df807e5ecf53a609cc6bfe93eac3cc7be5b3a9d0"