flow — A static type checker for JavaScript. More information: <https://flow.org/en/docs/cli/>.

Run a flow check

flow

Check which files are being checked by flow

flow ls

Run a type coverage check on all files in a directory

flow batch-coverage --show-all --strip-root {{path/to/directory}}

Display line-by-line type coverage stats

flow coverage --color {{path/to/file.jsx}}