Function debounce

Delays a function until it has stopped being called for wait milliseconds.

With immediate, it fires on the leading edge instead — the first call runs at once and subsequent ones are swallowed until the window closes. Use it for search inputs and resize handlers; use throttle when you want a guaranteed cadence rather than a quiet period.

⚠️ The constraint is (...args: never[]) => unknown, NOT (...args: unknown[]) => unknown. The latter looks equivalent and is not: parameters are contravariant, so unknown[] demands a callback accepting unknown in every position, which rejects every concretely-typed callback — (query: string) => void included. That was the real signature until 31/07/2026, and it made the documented example of this very function fail to compile (TS2345, frozen three days in the typecheck-docs-examples baseline). never[] is the idiom for "any function": it accepts them all, and Parameters<T> still recovers the true argument types.