Fix for windows

package.json

@@ -9,7 +9,7 @@
     "benchmark:browser": "pnpm --filter benchmark browser",
     "build": "lerna run build --ignore docs",
     "build:public": "lerna run --no-private build",
-    "build:ci": "lerna run build --ignore docs --concurrency 7 --skip-nx-cache",
+    "build:ci": "lerna run build --ignore docs --concurrency 8 --skip-nx-cache",
     "build:zero": "lerna run --scope \"@pigmentcss/*\" build",
     "clean:zero": "pnpm --filter \"@pigmentcss/*\" clean",
     "build:codesandbox": "NODE_OPTIONS=\"--max_old_space_size=4096\" lerna run --concurrency 8 --scope \"@mui/*\" --scope \"@mui-internal/*\" --no-private build",

packages/pigment-css-unplugin/src/utils.ts

@@ -1,4 +1,4 @@
-// import * as path from 'node:path';
+import * as path from 'node:path';
 
 export type AsyncResolver = (what: string, importer: string, stack: string[]) => Promise<string>;
 
@@ -39,9 +39,12 @@ export const handleUrlReplacement = async (
       if (!resolvedAbsolutePath) {
         newCss += `url(${mainItem})`;
       } else {
+        let pathFromRoot = resolvedAbsolutePath.replace(projectPath, '');
+        // Need to do this for Windows paths
+        pathFromRoot = pathFromRoot.split(path.sep).join('/');
         // const relativePathToProjectRoot = path.relative()
         // Next.js expects the path to be relative to the project root and starting with ~
-        newCss += `url(~${resolvedAbsolutePath.replace(projectPath, '')})`;
+        newCss += `url(~${pathFromRoot})`;
       }
     }
     lastIndex = match.index + match[0].length;