feat: allow to modify the interpolation options in webpack config

jantimon · jantimon · commit d654f5b90022 · 2021-03-07T17:49:09.000+01:00
diff --git a/lib/loader.js b/lib/loader.js
@@ -8,21 +8,28 @@ module.exports = function (source) {
   const options = this.getOptions();
   const force = options.force || false;
 
-  const allLoadersButThisOne = this.loaders.filter(function (loader) {
-    return loader.normal !== module.exports;
-  });
+  const allLoadersButThisOne = this.loaders.filter((loader) => loader.normal !== module.exports);
+
   // This loader shouldn't kick in if there is any other loader (unless it's explicitly enforced)
   if (allLoadersButThisOne.length > 0 && !force) {
     return source;
   }
+
+  // Allow only one html-webpack-plugin loader to allow loader options in the webpack config
+  const htmlWebpackPluginLoaders = this.loaders.filter((loader) => loader.normal === module.exports);
+  const lastHtmlWebpackPluginLoader = htmlWebpackPluginLoaders[htmlWebpackPluginLoaders.length - 1];
+  if (this.loaders[this.loaderIndex] !== lastHtmlWebpackPluginLoader) {
+    return source;
+  }
+
   // Skip .js files (unless it's explicitly enforced)
   if (/\.js$/.test(this.resourcePath) && !force) {
     return source;
   }
 
   // The following part renders the template with lodash as a minimalistic loader
   //
-  const template = _.template(source, _.defaults(options, { interpolate: /<%=([\s\S]+?)%>/g, variable: 'data' }));
+  const template = _.template(source, { interpolate: /<%=([\s\S]+?)%>/g, variable: 'data', ...options });
   // Use __non_webpack_require__ to enforce using the native nodejs require
   // during template execution
   return 'var _ = __non_webpack_require__(' + JSON.stringify(require.resolve('lodash')) + ');' +
diff --git a/spec/basic.spec.js b/spec/basic.spec.js
@@ -2750,4 +2750,36 @@ describe('HtmlWebpackPlugin', () => {
       ]
     }, ['<body>'], null, done);
   });
+
+  it('allows to set custom loader interpolation settings', done => {
+    testHtmlPlugin({
+      mode: 'production',
+      entry: {
+        app: path.join(__dirname, 'fixtures/index.js')
+      },
+      output: {
+        path: OUTPUT_DIR,
+        filename: '[name]_bundle.js'
+      },
+      module: {
+        rules: [
+          {
+            test: /\.html$/,
+            loader: require.resolve('../lib/loader.js'),
+            options: {
+              interpolate: /\{%=([\s\S]+?)%\}/g
+            }
+          }
+        ]
+      },
+      plugins: [
+        new HtmlWebpackPlugin({
+          title: 'Interpolation Demo',
+          template: path.join(__dirname, 'fixtures/interpolation.html')
+        })
+      ]
+    }, ['Interpolation Demo'], null, () => {
+      done();
+    });
+  });
 });
diff --git a/spec/fixtures/interpolation.html b/spec/fixtures/interpolation.html
@@ -2,10 +2,9 @@
 <html>
   <head>
     <meta charset="utf-8"/>
-    <title>Test</title>
+    <title>{%= htmlWebpackPlugin.options.title %}</title>
   </head>
   <body>
     <p>Some unique text</p>
-    <script src="{%=o.htmlWebpackPlugin.assets.app%}"></script>
   </body>
 </html>
