gridstack 13 changed `GridStack.init` to return `GridStack | null` where
11 always handed one back. The dashboard held the result in a
`GridStack | undefined` and called `.on('change')` on it straight after,
so svelte-check stopped on two errors: null is not undefined, and the
value is possibly neither.
Coalesced to undefined so the declared type stays as it was, then
guarded before the listener is attached. `gridEl` is already checked at
the top of the function, so a null here should not occur -- but the type
allows it, and a dashboard that quietly stops persisting drags beats one
that throws inside an effect.
Nothing else in the repository touches gridstack: one import of
`GridStack` and its stylesheet, in this file.
Worth noting `vite build` passes either way. Only `npm run check` sees
this, and no CI job runs it -- the two majors would have gone in
looking clean.
jcoffey-dev
efc8886bd8