feat(loader): add baseUri option when using loaderContext.importModule

Author: vankop

src/index.js

@@ -13,6 +13,7 @@ const {
   SINGLE_DOT_PATH_SEGMENT,
   compareModulesByIdentifier,
   getUndoPath,
+  BASE_URI,
 } = require("./utils");
 
 /** @typedef {import("schema-utils/declarations/validate").Schema} Schema */
@@ -1372,13 +1373,22 @@ class MiniCssExtractPlugin {
 
         const undoPath = getUndoPath(filename, compiler.outputPath, false);
 
+        // replacements
         content = content.replace(new RegExp(ABSOLUTE_PUBLIC_PATH, "g"), "");
         content = content.replace(
           new RegExp(SINGLE_DOT_PATH_SEGMENT, "g"),
           "."
         );
         content = content.replace(new RegExp(AUTO_PUBLIC_PATH, "g"), undoPath);
 
+        const entryOptions = chunk.getEntryOptions();
+        const baseUriReplacement =
+          (entryOptions && entryOptions.baseUri) || undoPath;
+        content = content.replace(
+          new RegExp(BASE_URI, "g"),
+          baseUriReplacement
+        );
+
         if (module.sourceMap) {
           source.add(
             new SourceMapSource(

src/loader.js

@@ -5,6 +5,7 @@ const {
   evalModuleCode,
   AUTO_PUBLIC_PATH,
   ABSOLUTE_PUBLIC_PATH,
+  BASE_URI,
   SINGLE_DOT_PATH_SEGMENT,
   stringifyRequest,
 } = require("./utils");
@@ -300,6 +301,7 @@ function pitch(request) {
       {
         layer: options.layer,
         publicPath: /** @type {string} */ (publicPathForExtract),
+        baseUri: BASE_URI,
       },
       /**
        * @param {Error | null | undefined} error

src/utils.js

@@ -86,6 +86,7 @@ function compareModulesByIdentifier(a, b) {
 const MODULE_TYPE = "css/mini-extract";
 const AUTO_PUBLIC_PATH = "__mini_css_extract_plugin_public_path_auto__";
 const ABSOLUTE_PUBLIC_PATH = "webpack:///mini-css-extract-plugin/";
+const BASE_URI = "webpack:///mini-css-extract-plugin-base-uri";
 const SINGLE_DOT_PATH_SEGMENT =
   "__mini_css_extract_plugin_single_dot_path_segment__";
 
@@ -212,6 +213,7 @@ module.exports = {
   MODULE_TYPE,
   AUTO_PUBLIC_PATH,
   ABSOLUTE_PUBLIC_PATH,
+  BASE_URI,
   SINGLE_DOT_PATH_SEGMENT,
   stringifyRequest,
   getUndoPath,

test/cases/base-uri/expected/asset/roboto-v18-latin-300.ttf

@@ -0,0 +1,7 @@
+@font-face {
+  font-family: Roboto-plp;
+  font-style: normal;
+  font-weight: 400;
+  src: url(asset/roboto-v18-latin-300.ttf) format("truetype");
+}
+

test/cases/base-uri/expected/index.css

@@ -0,0 +1,3 @@
+var __webpack_exports__ = {};
+
+

test/cases/base-uri/expected/index.mjs

@@ -0,0 +1 @@
+import "./main.css";

test/cases/base-uri/fonts/roboto-v18-latin-300.ttf

@@ -0,0 +1,6 @@
+@font-face {
+  font-family: Roboto-plp;
+  font-style: normal;
+  font-weight: 400;
+  src: url("./fonts/roboto-v18-latin-300.ttf") format("truetype");
+}

test/cases/base-uri/index.js

@@ -0,0 +1,42 @@
+import Self from "../../../src";
+
+/**
+ * @type {import('webpack').Configuration}
+ */
+module.exports = {
+  mode: "production",
+  devtool: false,
+  entry: {
+    index: "./index.js",
+  },
+  optimization: {
+    minimize: false,
+  },
+  output: {
+    module: true,
+    assetModuleFilename: "asset/[name][ext]",
+    chunkFormat: "module",
+    chunkLoading: "import",
+  },
+  experiments: {
+    outputModule: true,
+  },
+  module: {
+    rules: [
+      {
+        test: /\.css$/i,
+        use: [
+          {
+            loader: Self.loader,
+          },
+          "css-loader",
+        ],
+      },
+      {
+        test: /\.ttf$/i,
+        type: "asset/resource",
+      },
+    ],
+  },
+  plugins: [new Self({ experimentalUseImportModule: true })],
+};