How did I fix «'NODE_ENV' is not recognized as an internal or external command, operable program or batch file» on running `npm run build-prod` for Hyva in Cygwin?

Method 1 (recommended)

3.1.

Run it once:

npm install -g win-node-env

3.2.

(
	cd app/design/frontend/Hyva/child/web/tailwind
	npm run build-prod	
)

Method 2

2.1.

Run it once:

npm config set script-shell "$(cygpath -w /usr/bin/bash)"

2.2.

(
	cd app/design/frontend/Hyva/child/web/tailwind
	export NODE_ENV=production
	npm run build-prod	
)

Method 3

(
	cd app/design/frontend/Hyva/child/web/tailwind
	export NODE_ENV=production
	export npm_config_script_shell="$(cygpath -w /usr/bin/bash)"
	npm run build-prod	
)