yarn run v1.22.10 $ cross-env UMI_ENV=dev umi dev 'cross-env' is not recognized as an internal or external command, code example

Example 1: 'cross-env' is not recognized as an internal or external command,

You need to make cross-env working globally instead of having it in the project.

1) remove node_modules folder

2) run npm install --global cross-env

3) remove "cross-env": "^5.0.1", from package.json file devDependencies section.
Actually, you can skip this step and keep package.json intact. If you prefer.

4) run npm install --no-bin-links

5) run npm run dev

Example 2: 'cross-env' is not recognized as an internal or external command, laravel

npm install -global cross-env
npm install --no-bin-links