Fix escape backslashes in file paths on Windows

.github/workflows/ci.yml

@@ -3,12 +3,13 @@ name: CI
 on: [push, pull_request]
 jobs:
   build:
-    runs-on: ubuntu-latest
     permissions:
       contents: read
     strategy:
       matrix:
         node-version: [14.x, 16.x, 18.x]
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -20,7 +21,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: node_modules
-          key: node-modules-${{ hashFiles('package.json') }}
+          key: node-modules-${{ matrix.os }}-${{ hashFiles('package.json') }}
       - name: Install dependencies
         run: npm install
       - name: Run Tests

src/index.js

@@ -1,7 +1,7 @@
 const webpack = require('webpack')
 const CommonJsRequireDependency = require('webpack/lib/dependencies/CommonJsRequireDependency')
 const { createFsFromVolume, Volume } = require('memfs')
-const { sep, dirname, relative } = require('path')
+const { dirname, relative } = require('path')
 // const { cache } = require('webpack') // Cache handling missing
 
 const fileBanner = `/* Start of pino-webpack-plugin additions */
@@ -157,6 +157,8 @@ class PinoWebpackPlugin {
           compilation.entrypoints.forEach((ep, k) => {
             for (const entrypointFile of ep.getFiles()) {
               const relativePath = relative(dirname(entrypointFile), '.') || '.'
+              // Fix escape character in file path separator.
+              const sep = '/'
 
               compilation.updateAsset(
                 entrypointFile,