TypeScript – use correct version of setTimeout (node vs window)

by 
let timer: ReturnType<typeof setTimeout> = setTimeout(() => { ... });

clearTimeout(timer);

By using ReturnType<fn> you are getting independence from platform. You won’t be forced to use neither any nor window.setTimeout which will break if you run the code on nodeJS server (eg. server-side rendered page).

Good news, this is also compatible with Deno!

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