Add Windows batch support

.gitattributes

@@ -0,0 +1,5 @@
+.gitattributes text eol=lf
+README.md text eol=lf
+.github/workflows/*.yml text eol=lf
+node-reinstall.bat text eol=crlf
+test/*.bat text eol=crlf

.github/workflows/windows-test.yml

@@ -0,0 +1,19 @@
+name: Windows test
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  batch-smoke:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Run Windows smoke checks
+        shell: cmd
+        run: call test\windows-smoke.bat

README.md

@@ -28,6 +28,56 @@ This script assumes you are comfortable enough with UNIX to perform these action
 
 ![](img/pay-attention.gif)
 
+## Windows
+
+Windows support is provided by `node-reinstall.bat`. It is intentionally narrower
+than the OSX/Linux script: it removes the user-level npm paths that commonly hold
+global npm shims, modules, caches, and native build artifacts, then reinstalls
+Node.js through nvm-windows when `nvm` is available on `PATH`.
+
+The Windows script may delete:
+
+```
+%APPDATA%\npm\npm
+%APPDATA%\npm\npm.cmd
+%APPDATA%\npm\npx
+%APPDATA%\npm\npx.cmd
+%APPDATA%\npm\node_modules
+%APPDATA%\npm-cache
+%USERPROFILE%\.npm
+%USERPROFILE%\.npm-cache
+%USERPROFILE%\.node-gyp
+```
+
+Preview the cleanup before deleting anything:
+
+```
+node-reinstall.bat --dry-run
+```
+
+Run the non-destructive Windows smoke checks:
+
+```
+test\windows-smoke.bat
+```
+
+Run the Windows re-installer:
+
+```
+node-reinstall.bat
+```
+
+Or specify a Node.js version for nvm-windows:
+
+```
+node-reinstall.bat 20.11.1
+```
+
+If nvm-windows is not installed, the script still performs the npm cleanup and
+prints the next manual install step instead of downloading or running an
+installer for you. The repository pins `node-reinstall.bat` to CRLF line endings
+so Windows `cmd.exe` can resolve its internal labels reliably.
+
 ## Summary
 This is a complete (and very destructive) tool for re-installing Node.js on OSX and Linux. See the [SO article](http://stackoverflow.com/a/11178106/2083544) for reference and the related [gist that spawned this repo](https://gist.github.com/brock/5b1b70590e1171c4ab54). This deletes ~~everything, yes everything,~~ **a lot of stuff you might want** and completely removes Node.js and NPM and replaces it with the Node Version Manager called [NVM](https://github.com/creationix/nvm). It will attempt to re-install any global NPM modules already installed, and you can opt for Nave instead of NVM if you prefer.
 

node-reinstall.bat

@@ -0,0 +1,209 @@
+@echo off
+setlocal EnableExtensions EnableDelayedExpansion
+
+set "VERSION=0.0.17"
+set "DEFAULT_NODE_VERSION=5"
+set "FORCE=0"
+set "DRY_RUN=0"
+set "DESIRED_NODE_VERSION="
+set "GLOBAL_MODULES_FILE=%TEMP%\node-reinstall-global-modules-%RANDOM%.txt"
+
+:parse_args
+if "%~1"=="" goto after_args
+set "ARG=%~1"
+if /I "%ARG%"=="--help" goto usage
+if /I "%ARG%"=="-h" goto usage
+if /I "%ARG%"=="--version" goto version
+if /I "%ARG%"=="-v" goto version
+if /I "%ARG%"=="--force" (
+  set "FORCE=1"
+  shift
+  goto parse_args
+)
+if /I "%ARG%"=="-f" (
+  set "FORCE=1"
+  shift
+  goto parse_args
+)
+if /I "%ARG%"=="--dry-run" (
+  set "DRY_RUN=1"
+  shift
+  goto parse_args
+)
+if "%ARG:~0,1%"=="-" (
+  echo error: Unknown option `%ARG%` 1>&2
+  call :usage_text 1>&2
+  exit /b 1
+)
+if defined DESIRED_NODE_VERSION (
+  echo error: Only one NODE_VERSION argument is supported. 1>&2
+  call :usage_text 1>&2
+  exit /b 1
+)
+set "DESIRED_NODE_VERSION=%ARG%"
+shift
+goto parse_args
+
+:after_args
+call :detect_node_version
+
+if defined DESIRED_NODE_VERSION (
+  set "NODE_VERSION=%DESIRED_NODE_VERSION%"
+) else if defined INSTALLED_NODE_VERSION (
+  set "NODE_VERSION=%INSTALLED_NODE_VERSION%"
+) else (
+  set "NODE_VERSION=%DEFAULT_NODE_VERSION%"
+)
+
+if /I "%NODE_VERSION:~0,1%"=="v" set "NODE_VERSION=%NODE_VERSION:~1%"
+
+echo node-reinstall.bat will delete user-level Windows Node/npm paths.
+echo Read this script before continuing. The deleted files cannot be recovered.
+echo.
+
+if defined INSTALLED_NODE_VERSION (
+  echo Found Node.js version %INSTALLED_NODE_VERSION% already installed.
+  echo If you continue now, this script will clean npm paths and reinstall Node.js version %NODE_VERSION% when nvm-windows is available.
+  call :confirm || exit /b 1
+)
+
+call :collect_global_modules
+
+if exist "%GLOBAL_MODULES_FILE%" (
+  echo Will reinstall these global npm modules after Node is available:
+  for /f "usebackq delims=" %%M in ("%GLOBAL_MODULES_FILE%") do echo   %%M
+) else (
+  echo No global npm modules were detected before cleanup.
+)
+
+call :confirm || exit /b 1
+
+call :remove_file "%APPDATA%\npm\npm"
+call :remove_file "%APPDATA%\npm\npm.cmd"
+call :remove_file "%APPDATA%\npm\npx"
+call :remove_file "%APPDATA%\npm\npx.cmd"
+call :remove_dir "%APPDATA%\npm\node_modules"
+call :remove_dir "%APPDATA%\npm-cache"
+call :remove_dir "%USERPROFILE%\.npm"
+call :remove_dir "%USERPROFILE%\.npm-cache"
+call :remove_dir "%USERPROFILE%\.node-gyp"
+
+call :reinstall_with_nvm
+call :reinstall_global_modules
+
+if exist "%GLOBAL_MODULES_FILE%" del /f /q "%GLOBAL_MODULES_FILE%" >nul 2>nul
+
+echo node-reinstall.bat is done.
+echo You must restart your terminal for changes to take effect.
+exit /b 0
+
+:usage
+call :usage_text
+exit /b 0
+
+:usage_text
+echo node-reinstall.bat
+echo   completely cleans Windows Node/npm user paths and reinstalls with nvm-windows when available.
+echo.
+echo Usage: node-reinstall.bat [-h^|--help] [-v^|--version] [-f^|--force] [--dry-run] [NODE_VERSION]
+echo.
+echo Commands:
+echo   node-reinstall.bat             clean npm paths and reinstall current/default Node version with nvm-windows
+echo   node-reinstall.bat --dry-run   show what would be deleted or run without changing anything
+echo   node-reinstall.bat -f          skip confirmation prompts
+echo   node-reinstall.bat 20.11.1     reinstall a specific Node.js version with nvm-windows
+exit /b 0
+
+:version
+echo %VERSION%
+exit /b 0
+
+:confirm
+if "%FORCE%"=="1" exit /b 0
+choice /C YN /N /M "Continue? [Y/N] "
+if errorlevel 2 exit /b 1
+exit /b 0
+
+:detect_node_version
+set "INSTALLED_NODE_VERSION="
+for /f "usebackq delims=" %%V in (`node --version 2^>nul`) do (
+  set "INSTALLED_NODE_VERSION=%%V"
+)
+exit /b 0
+
+:collect_global_modules
+if exist "%GLOBAL_MODULES_FILE%" del /f /q "%GLOBAL_MODULES_FILE%" >nul 2>nul
+where npm >nul 2>nul
+if errorlevel 1 exit /b 0
+
+for /f "usebackq delims=" %%G in (`npm -g list --depth 0 --parseable 2^>nul`) do (
+  for %%M in ("%%G") do set "MODULE_NAME=%%~nxM"
+  if /I not "!MODULE_NAME!"=="node_modules" if /I not "!MODULE_NAME!"=="npm" if not "!MODULE_NAME!"=="" (
+    echo !MODULE_NAME!>>"%GLOBAL_MODULES_FILE%"
+  )
+)
+
+for %%F in ("%GLOBAL_MODULES_FILE%") do if %%~zF EQU 0 del /f /q "%GLOBAL_MODULES_FILE%" >nul 2>nul
+exit /b 0
+
+:remove_file
+set "TARGET=%~1"
+if not exist "%TARGET%" exit /b 0
+if "%DRY_RUN%"=="1" (
+  echo Would delete file: "%TARGET%"
+  exit /b 0
+)
+echo Deleting file: "%TARGET%"
+del /f /q "%TARGET%"
+exit /b %ERRORLEVEL%
+
+:remove_dir
+set "TARGET=%~1"
+if not exist "%TARGET%\" exit /b 0
+if "%DRY_RUN%"=="1" (
+  echo Would delete directory: "%TARGET%"
+  exit /b 0
+)
+echo Deleting directory: "%TARGET%"
+rmdir /s /q "%TARGET%"
+exit /b %ERRORLEVEL%
+
+:reinstall_with_nvm
+where nvm >nul 2>nul
+if errorlevel 1 (
+  echo nvm-windows was not found on PATH.
+  echo Install Node manually from https://nodejs.org/ or install nvm-windows, then rerun this script.
+  exit /b 0
+)
+
+if "%DRY_RUN%"=="1" (
+  echo Would run: nvm install %NODE_VERSION%
+  echo Would run: nvm use %NODE_VERSION%
+  exit /b 0
+)
+
+echo Installing Node.js %NODE_VERSION% with nvm-windows.
+nvm install %NODE_VERSION%
+if errorlevel 1 exit /b %ERRORLEVEL%
+nvm use %NODE_VERSION%
+exit /b %ERRORLEVEL%
+
+:reinstall_global_modules
+if not exist "%GLOBAL_MODULES_FILE%" exit /b 0
+where npm >nul 2>nul
+if errorlevel 1 (
+  echo npm was not found after cleanup, so global modules were not reinstalled.
+  exit /b 0
+)
+
+if "%DRY_RUN%"=="1" (
+  for /f "usebackq delims=" %%M in ("%GLOBAL_MODULES_FILE%") do echo Would run: npm install --global %%M
+  exit /b 0
+)
+
+for /f "usebackq delims=" %%M in ("%GLOBAL_MODULES_FILE%") do (
+  echo Reinstalling global module: %%M
+  npm install --global %%M
+  if errorlevel 1 exit /b %ERRORLEVEL%
+)
+exit /b 0

test/windows-smoke.bat

@@ -0,0 +1,22 @@
+@echo off
+setlocal EnableExtensions
+
+set "SCRIPT=%~dp0..\node-reinstall.bat"
+
+call "%SCRIPT%" --help
+if errorlevel 1 exit /b %ERRORLEVEL%
+
+call "%SCRIPT%" --version
+if errorlevel 1 exit /b %ERRORLEVEL%
+
+call "%SCRIPT%" --dry-run --force 20.11.1
+if errorlevel 1 exit /b %ERRORLEVEL%
+
+call "%SCRIPT%" --not-a-real-option
+if not errorlevel 1 (
+  echo Expected unknown option to fail.
+  exit /b 1
+)
+
+echo Windows smoke checks passed.
+exit /b 0