Most comment directives in the JS/TS ecosystem fall into a handful of syntactic families. Here are the major ones with real examples, grouped by shape:
1. // @tool-action — at-prefixed keyword, mostly flags
// @ts-ignore
// @ts-expect-error
// @ts-nocheck // file-level
// @ts-check // file-level opt-in (in .js)
// @flow // Flow