is not recognized as an internal or external command, operable program or batch file. code example

Example 1: 'source' is not recognized as an internal or external command, operable program or batch file.

env\Scripts\activate

Example 2: 'BROWSER' is not recognized as an internal or external command,

There are two fixes i found that works perfectly well first one : install cross-env (npm package)npm install cross-env then you change your dev script to

"electron-dev": "concurrently \"cross-env BROWSER=none yarn start\" \"wait-on http://localhost:3000 && electron .\"",

please note that you also have to install concurrently if not already installed

second one : install concurrently and run this (on windows though)

"electron-dev": "concurrently \"SET BROWSER=none&&npm run start\" \"wait-on http://localhost:3000 && electron .\""

Example 3: batch 'else' is not recognized as an internal or external command, operable program or batch file.

if exist "%userprofile%\.android\avd\%avdName%.avd" (
   msg %username% 'true'
) else (
   msg %username% 'false'
)

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Misc Example