test: contenthash should not changed on different operating systems

package.json

@@ -80,6 +80,7 @@
     "jest-junit": "^10.0.0",
     "lint-staged": "^10.1.2",
     "memfs": "^3.1.2",
+    "mini-css-extract-plugin": "^0.9.0",
     "npm-run-all": "^4.1.5",
     "postcss-loader": "^3.0.0",
     "postcss-preset-env": "^6.7.0",

src/index.js

@@ -19,7 +19,6 @@ import {
   getImportCode,
   getModuleCode,
   getModulesPlugins,
-  normalizeSourceMap,
   shouldUseModulesPlugins,
 } from './utils';
 
@@ -83,11 +82,12 @@ export default function loader(content, map, meta) {
   postcss(plugins)
     .process(content, {
       from: this.remainingRequest.split('!').pop(),
-      to: this.currentRequest.split('!').pop(),
+      // eslint-disable-next-line no-undefined
+      to: undefined,
       map: options.sourceMap
         ? {
             // Some loaders (example `"postcss-loader": "1.x.x"`) always generates source map, we should remove it
-            prev: sourceMap && map ? normalizeSourceMap(map) : null,
+            prev: sourceMap && map ? map : null,
             inline: false,
             annotation: false,
           }
@@ -137,7 +137,8 @@ export default function loader(content, map, meta) {
         apiImports,
         urlReplacements,
         icssReplacements,
-        esModule
+        esModule,
+        this
       );
       const exportCode = getExportCode(
         exports,

src/utils.js

@@ -190,19 +190,13 @@ function getModulesPlugins(options, loaderContext) {
 }
 
 function normalizeSourceMap(map) {
-  let newMap = map;
-
-  // Some loader emit source map as string
-  // Strip any JSON XSSI avoidance prefix from the string (as documented in the source maps specification), and then parse the string as JSON.
-  if (typeof newMap === 'string') {
-    newMap = JSON.parse(newMap);
-  }
+  const newMap = map.toJSON();
 
   // Source maps should use forward slash because it is URLs (https://github.com/mozilla/source-map/issues/91)
   // We should normalize path because previous loaders like `sass-loader` using backslash when generate source map
 
   if (newMap.file) {
-    newMap.file = normalizePath(newMap.file);
+    delete newMap.file;
   }
 
   if (newMap.sourceRoot) {
@@ -274,14 +268,18 @@ function getModuleCode(
   apiImports,
   urlReplacements,
   icssReplacements,
-  esModule
+  esModule,
+  loaderContext
 ) {
   if (exportType !== 'full') {
     return '';
   }
 
   const { css, map } = result;
-  const sourceMapValue = sourceMap && map ? `,${map}` : '';
+  const sourceMapValue =
+    sourceMap && map
+      ? `,${JSON.stringify(normalizeSourceMap(map, loaderContext))}`
+      : '';
 
   let code = JSON.stringify(css);
   let beforeCode = '';