fix: use right methods

Author: achipiga

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Launch Program",
+      "skipFiles": ["<node_internals>/**"],
+      "program": "${workspaceFolder}/node_modules/.bin/jasmine"
+    }
+  ]
+}

lib/optimizer.js

@@ -1,4 +1,3 @@
-const { ReplaceSource } = require('webpack-sources');
 const chalk = require('./chalk');
 const ClassGenerator = require('./classGenerator');
 
@@ -17,7 +16,7 @@ const validate = (opts, classGenerator) => {
   }
 };
 
-const optimize = ([file, originalSource], compilation, opts, classGenerator) => {
+const optimize = (compiler, [file, originalSource], compilation, opts, classGenerator) => {
   let classnameRegex;
   if (file.match(/.+\.css.*$/)) {
     classnameRegex = new RegExp(`\\\.(${opts.classNameRegExp})`, 'g');
@@ -37,6 +36,9 @@ const optimize = ([file, originalSource], compilation, opts, classGenerator) =>
 
   const rawSource = originalSource.source();
   let source;
+
+  const { ReplaceSource } = compiler.webpack.sources;
+
   while (match = classnameRegex.exec(rawSource)) {
     const originalName = match[1];
     let targetName = originalName
@@ -77,13 +79,13 @@ const optimize = ([file, originalSource], compilation, opts, classGenerator) =>
   if (!source) {
     return;
   }
-  compilation.assets[file] = source;
+  compilation.updateAsset(file, source, { minimized: true });
 };
 
 const optimizer = (compiler, compilation, opts) => (assets) => {
   if (!opts.classNameRegExp) throw new Error("'classNameRegExp' option is required. e.g. '[c]-[a-z][a-zA-Z0-9_]*'");
   const classGenerator = new ClassGenerator();
-  Object.entries(assets).forEach((asset) => optimize(asset, compilation, opts, classGenerator));
+  Object.entries(assets).forEach((asset) => optimize(compiler, asset, compilation, opts, classGenerator));
   validate(opts, classGenerator);
 }