watch-of-a-prop-that-is-not-there

This fails the run. Where it is wrong about your code, // ramonda-check-ignore <reason> on the line says so, and the reason is printed on every run.

Reported when a @watchProp selector names something the component's props type does not declare, so the method never runs.

The selector IS the declaration: @watchProp((p) => p.userId) says to run the method when userId changes. Naming something that is not a prop makes the selector read undefined on every render, which never differs from the undefined before it — so the method never runs, for the whole life of the component. Nothing throws. The reaction is simply absent, and whatever it kept in step drifts.

Usually it is a rename that reached the props type and not the selector, or a typo. Check the spelling against the props the report lists.

tsc refuses this too — until somebody writes (p: any) => …, a @ts-ignore, or widens the props type for an unrelated reason. That is why it is checked here as well.

Next

• All rules — the other checks this one runs beside.
• Checking your app — how to run it, and what it proves.