fix: handling urls in @import

src/plugins/postcss-import-parser.js

@@ -1,22 +1,24 @@
 import postcss from 'postcss';
 import valueParser from 'postcss-value-parser';
-import { isUrlRequest, urlToRequest } from 'loader-utils';
+import { isUrlRequest } from 'loader-utils';
 
-const pluginName = 'postcss-import-parser';
+import { normalizeUrl } from '../utils';
 
-function getArg(nodes) {
-  return nodes.length !== 0 && nodes[0].type === 'string'
-    ? nodes[0].value
-    : valueParser.stringify(nodes);
-}
+const pluginName = 'postcss-import-parser';
 
-function getUrl(node) {
+function getParsedValue(node) {
   if (node.type === 'function' && node.value.toLowerCase() === 'url') {
-    return getArg(node.nodes);
+    const { nodes } = node;
+    const isStringValue = nodes.length !== 0 && nodes[0].type === 'string';
+    const url = isStringValue ? nodes[0].value : valueParser.stringify(nodes);
+
+    return { url, isStringValue };
   }
 
   if (node.type === 'string') {
-    return node.value;
+    const url = node.value;
+
+    return { url, isStringValue: true };
   }
 
   return null;
@@ -29,14 +31,22 @@ function parseImport(params) {
     return null;
   }
 
-  let url = getUrl(nodes[0]);
+  const value = getParsedValue(nodes[0]);
 
-  if (!url || url.trim().length === 0) {
+  if (!value) {
+    return null;
+  }
+
+  let { url } = value;
+
+  if (url.trim().length === 0) {
     return null;
   }
 
   if (isUrlRequest(url)) {
-    url = urlToRequest(url);
+    const { isStringValue } = value;
+
+    url = normalizeUrl(url, isStringValue);
   }
 
   return {

src/plugins/postcss-url-parser.js

@@ -1,8 +1,7 @@
 import postcss from 'postcss';
 import valueParser from 'postcss-value-parser';
-import { urlToRequest } from 'loader-utils';
 
-import { unescape } from '../utils';
+import { normalizeUrl } from '../utils';
 
 const pluginName = 'postcss-url-parser';
 
@@ -21,13 +20,11 @@ function walkUrls(parsed, callback) {
     }
 
     if (isUrlFunc.test(node.value)) {
-      const isStringNode =
-        node.nodes.length !== 0 && node.nodes[0].type === 'string';
-      const url = isStringNode
-        ? node.nodes[0].value
-        : valueParser.stringify(node.nodes);
+      const { nodes } = node;
+      const isStringValue = nodes.length !== 0 && nodes[0].type === 'string';
+      const url = isStringValue ? nodes[0].value : valueParser.stringify(nodes);
 
-      callback(getNodeFromUrlFunc(node), url, false, isStringNode);
+      callback(getNodeFromUrlFunc(node), url, false, isStringValue);
 
       // Do not traverse inside `url`
       // eslint-disable-next-line consistent-return
@@ -36,18 +33,22 @@ function walkUrls(parsed, callback) {
 
     if (isImageSetFunc.test(node.value)) {
       node.nodes.forEach((nNode) => {
-        if (nNode.type === 'function' && isUrlFunc.test(nNode.value)) {
-          const isStringNode =
-            nNode.nodes.length !== 0 && nNode.nodes[0].type === 'string';
-          const url = isStringNode
-            ? nNode.nodes[0].value
-            : valueParser.stringify(nNode.nodes);
-
-          callback(getNodeFromUrlFunc(nNode), url, false, isStringNode);
+        const { type, value } = nNode;
+
+        if (type === 'function' && isUrlFunc.test(value)) {
+          const { nodes } = nNode;
+
+          const isStringValue =
+            nodes.length !== 0 && nodes[0].type === 'string';
+          const url = isStringValue
+            ? nodes[0].value
+            : valueParser.stringify(nodes);
+
+          callback(getNodeFromUrlFunc(nNode), url, false, isStringValue);
         }
 
-        if (nNode.type === 'string') {
-          callback(nNode, nNode.value, true, true);
+        if (type === 'string') {
+          callback(nNode, value, true, true);
         }
       });
 
@@ -66,7 +67,7 @@ function getUrlsFromValue(value, result, filter, decl) {
   const parsed = valueParser(value);
   const urls = [];
 
-  walkUrls(parsed, (node, url, needQuotes, isStringNode) => {
+  walkUrls(parsed, (node, url, needQuotes, isStringValue) => {
     if (url.trim().replace(/\\[\r\n]/g, '').length === 0) {
       result.warn(`Unable to find uri in '${decl ? decl.toString() : value}'`, {
         node: decl,
@@ -80,19 +81,13 @@ function getUrlsFromValue(value, result, filter, decl) {
     }
 
     const splittedUrl = url.split(/(\?)?#/);
-    let [normalizedUrl] = splittedUrl;
-    const [, singleQuery, hashValue] = splittedUrl;
+    const [urlWithoutHash, singleQuery, hashValue] = splittedUrl;
     const hash =
       singleQuery || hashValue
         ? `${singleQuery ? '?' : ''}${hashValue ? `#${hashValue}` : ''}`
         : '';
 
-    // See https://drafts.csswg.org/css-values-4/#strings
-    if (isStringNode && /\\[\n]/.test(normalizedUrl)) {
-      normalizedUrl = normalizedUrl.replace(/\\[\n]/g, '');
-    }
-
-    normalizedUrl = urlToRequest(decodeURIComponent(unescape(normalizedUrl)));
+    const normalizedUrl = normalizeUrl(urlWithoutHash, isStringValue);
 
     urls.push({ node, url: normalizedUrl, hash, needQuotes });
   });

src/utils.js

@@ -4,7 +4,11 @@
 */
 import path from 'path';
 
-import loaderUtils, { isUrlRequest, stringifyRequest } from 'loader-utils';
+import loaderUtils, {
+  isUrlRequest,
+  stringifyRequest,
+  urlToRequest,
+} from 'loader-utils';
 import normalizePath from 'normalize-path';
 import cssesc from 'cssesc';
 import modulesValues from 'postcss-modules-values';
@@ -13,23 +17,6 @@ import extractImports from 'postcss-modules-extract-imports';
 import modulesScope from 'postcss-modules-scope';
 import camelCase from 'camelcase';
 
-function getImportPrefix(loaderContext, importLoaders) {
-  if (importLoaders === false) {
-    return '';
-  }
-
-  const numberImportedLoaders = parseInt(importLoaders, 10) || 0;
-  const loadersRequest = loaderContext.loaders
-    .slice(
-      loaderContext.loaderIndex,
-      loaderContext.loaderIndex + 1 + numberImportedLoaders
-    )
-    .map((x) => x.request)
-    .join('!');
-
-  return `-!${loadersRequest}!`;
-}
-
 const whitespace = '[\\x20\\t\\r\\n\\f]';
 const unescapeRegExp = new RegExp(
   `\\\\([\\da-f]{1,6}${whitespace}?|(${whitespace})|.)`,
@@ -90,6 +77,16 @@ function getLocalIdent(loaderContext, localIdentName, localName, options) {
   ).replace(/\\\[local\\\]/gi, localName);
 }
 
+function normalizeUrl(url, isStringValue) {
+  let normalizedUrl = url;
+
+  if (isStringValue && /\\[\n]/.test(normalizedUrl)) {
+    normalizedUrl = normalizedUrl.replace(/\\[\n]/g, '');
+  }
+
+  return urlToRequest(decodeURIComponent(unescape(normalizedUrl)));
+}
+
 function getFilter(filter, resourcePath, defaultFilter = null) {
   return (item) => {
     if (defaultFilter && !defaultFilter(item)) {
@@ -186,6 +183,23 @@ function normalizeSourceMap(map) {
   return newMap;
 }
 
+function getImportPrefix(loaderContext, importLoaders) {
+  if (importLoaders === false) {
+    return '';
+  }
+
+  const numberImportedLoaders = parseInt(importLoaders, 10) || 0;
+  const loadersRequest = loaderContext.loaders
+    .slice(
+      loaderContext.loaderIndex,
+      loaderContext.loaderIndex + 1 + numberImportedLoaders
+    )
+    .map((x) => x.request)
+    .join('!');
+
+  return `-!${loadersRequest}!`;
+}
+
 function getImportCode(
   loaderContext,
   imports,
@@ -395,7 +409,7 @@ function getExportCode(
 }
 
 export {
-  unescape,
+  normalizeUrl,
   getFilter,
   getModulesPlugins,
   normalizeSourceMap,