refactor: source map code

BREAKING CHANGE: `sources` in source maps are absolute

Author: evilebottnawi

package-lock.json

@@ -44,7 +44,6 @@
   "dependencies": {
     "cosmiconfig": "^7.0.0",
     "loader-utils": "^2.0.0",
-    "normalize-path": "^3.0.0",
     "postcss": "^7.0.0",
     "schema-utils": "^2.7.0"
   },
@@ -80,7 +79,7 @@
     "postcss-short": "^5.0.0",
     "prettier": "^2.0.5",
     "sass": "^1.26.10",
-    "sass-loader": "^9.0.3",
+    "sass-loader": "^10.0.1",
     "standard": "^14.3.4",
     "standard-version": "^8.0.2",
     "strip-ansi": "^6.0.0",

package.json

@@ -12,9 +12,8 @@ import {
   loadConfig,
   getPostcssOptions,
   exec,
-  getSourceMapAbsolutePath,
-  getSourceMapRelativePath,
   normalizeSourceMap,
+  normalizeSourceMapAfterPostcss,
 } from './utils';
 
 /**
@@ -38,43 +37,40 @@ export default async function loader(content, sourceMap, meta = {}) {
     baseDataPath: 'options',
   });
 
-  const file = this.resourcePath;
-  const configOptions =
+  const callback = this.async();
+  const configOption =
     typeof options.postcssOptions === 'undefined' ||
     typeof options.postcssOptions.config === 'undefined'
       ? true
       : options.postcssOptions.config;
-
   let loadedConfig = {};
 
-  const callback = this.async();
-
-  if (configOptions) {
+  if (configOption) {
     const dataForLoadConfig = {
-      path: path.dirname(file),
+      path: path.dirname(this.resourcePath),
       ctx: {
         file: {
-          extname: path.extname(file),
-          dirname: path.dirname(file),
-          basename: path.basename(file),
+          extname: path.extname(this.resourcePath),
+          dirname: path.dirname(this.resourcePath),
+          basename: path.basename(this.resourcePath),
         },
         options: {},
       },
     };
 
-    if (typeof configOptions.path !== 'undefined') {
-      dataForLoadConfig.path = path.resolve(configOptions.path);
+    if (typeof configOption.path !== 'undefined') {
+      dataForLoadConfig.path = path.resolve(configOption.path);
     }
 
-    if (typeof configOptions.ctx !== 'undefined') {
-      dataForLoadConfig.ctx.options = configOptions.ctx;
+    if (typeof configOption.ctx !== 'undefined') {
+      dataForLoadConfig.ctx.options = configOption.ctx;
     }
 
     dataForLoadConfig.ctx.webpack = this;
 
     try {
       loadedConfig = await loadConfig(
-        configOptions,
+        configOption,
         dataForLoadConfig.ctx,
         dataForLoadConfig.path,
         this
@@ -104,18 +100,12 @@ export default async function loader(content, sourceMap, meta = {}) {
 
   if (useSourceMap) {
     processOptions.map = { inline: false, annotation: false };
-    // options.sourceMap === 'inline'
-    //   ? { inline: true, annotation: false }
-    //   : { inline: false, annotation: false };
 
     if (sourceMap) {
-      const sourceMapNormalized = normalizeSourceMap(sourceMap);
-
-      sourceMapNormalized.sources = sourceMapNormalized.sources.map((src) =>
-        getSourceMapRelativePath(src, path.dirname(file))
+      processOptions.map.prev = normalizeSourceMap(
+        sourceMap,
+        this.resourcePath
       );
-
-      processOptions.map.prev = sourceMapNormalized;
     }
   }
 
@@ -137,11 +127,11 @@ export default async function loader(content, sourceMap, meta = {}) {
     return;
   }
 
-  result.warnings().forEach((warning) => {
+  for (const warning of result.warnings()) {
     this.emitWarning(new Warning(warning));
-  });
+  }
 
-  result.messages.forEach((message) => {
+  for (const message of result.messages) {
     if (message.type === 'dependency') {
       this.addDependency(message.file);
     }
@@ -154,16 +144,13 @@ export default async function loader(content, sourceMap, meta = {}) {
         message.info
       );
     }
-  });
+  }
 
-  const map = result.map ? result.map.toJSON() : null;
+  // eslint-disable-next-line no-undefined
+  let map = result.map ? result.map.toJSON() : undefined;
 
   if (map && useSourceMap) {
-    if (typeof map.file !== 'undefined') {
-      delete map.file;
-    }
-
-    map.sources = map.sources.map((src) => getSourceMapAbsolutePath(src, file));
+    map = normalizeSourceMapAfterPostcss(map, this.resourcePath);
   }
 
   const ast = {

src/index.js

@@ -75,12 +75,8 @@
               ]
             },
             "plugins": {
-              "description": "Set PostCSS Plugins (https://github.com/postcss/postcss-loader#plugins)",
-              "anyOf": [
-                { "type": "array" },
-                { "type": "object" },
-                { "instanceof": "Function" }
-              ]
+              "description": "Sets PostCSS Plugins (https://github.com/postcss/postcss-loader#plugins)",
+              "anyOf": [{ "type": "array" }, { "type": "object" }]
             }
           }
         },
@@ -90,13 +86,13 @@
       ]
     },
     "exec": {
-      "description": "Enable PostCSS Parser support in 'CSS-in-JS' (https://github.com/postcss/postcss-loader#exec)",
+      "description": "Enables/Disables PostCSS Parser support in 'CSS-in-JS' (https://github.com/postcss/postcss-loader#exec)",
       "type": "boolean"
     },
     "sourceMap": {
       "description": "Enables/Disables generation of source maps (https://github.com/postcss/postcss-loader#sourcemap)",
       "type": "boolean"
     }
   },
-  "additionalProperties": true
+  "additionalProperties": false
 }