book-test/node_modules/concurrently/docs/cli/configuration.md

Configuration

You might want to configure concurrently to always have certain flags on. Any of concurrently's flags can be set via environment variables that are prefixed with CONCURRENTLY_.

$ export CONCURRENTLY_KILL_OTHERS=true
$ export CONCURRENTLY_HANDLE_INPUT=true
# Equivalent to passing --kill-others and --handle-input
$ concurrently nodemon "echo 'hey nodemon, you won't last long'"