Batch script - "smart" package manager command for JS projects

pm.bat

@echo off
setlocal EnableDelayedExpansion

set "DIR=%CD%"
:FIND_ROOT
if exist "!DIR!\package-lock.json" (
    set PM=npm
) else if exist "!DIR!\yarn.lock" (
    set PM=yarn
) else if exist "!DIR!\pnpm-lock.yaml" (
    set PM=pnpm
) else if exist "!DIR!\bun.lockb" (
    set PM=bun
) else (
    if "!DIR!" == "!DIR:~0,3!" (
        echo No recognized lockfile found in hierarchy. Exiting...
        exit /b 1
    )
    for %%I in ("!DIR!") do set "DIR=%%~dpI"
    set "DIR=!DIR:~0,-1!"
    goto FIND_ROOT
)

call %PM% %*
endlocal