feat: generate higher quality SourceMaps (#109)

Author: sokra

package.json

@@ -44,7 +44,7 @@
     "schema-utils": "^1.0.0",
     "serialize-javascript": "^1.7.0",
     "source-map": "^0.6.1",
-    "terser": "^4.1.2",
+    "terser": "^4.0.0",
     "webpack-sources": "^1.4.0",
     "worker-farm": "^1.7.0"
   },

src/index.js

@@ -299,7 +299,8 @@ class TerserPlugin {
               file,
               JSON.parse(map),
               input,
-              inputSourceMap
+              inputSourceMap,
+              true
             );
           } else {
             outputSource = new RawSource(code);

src/minify.js

@@ -158,11 +158,9 @@ const minify = (options) => {
   // Copy terser options
   const terserOptions = buildTerserOptions(options.terserOptions);
 
-  // Add source map data
+  // Let terser generate a SourceMap
   if (inputSourceMap) {
-    terserOptions.sourceMap = {
-      content: inputSourceMap,
-    };
+    terserOptions.sourceMap = true;
   }
 
   const extractedComments = [];