The three fields launch actually reads. Narrower than Config on purpose: qunitx run
has a config of its own with no test files in it, and asking it to fake thirty unrelated fields
to borrow the CDP pre-launch fast path would be a cast pretending to be a type.
const target: LaunchTarget = { browser: 'chromium', open: false, watch: false }; target.browser; // 'chromium'