Blog · Exclude

Exclude

Exclude creates a new type by removing certain types from a union.
It’s useful when you want to restrict the types that can be used in a specific context.

type Event = 'click' | 'scroll' | 'mousemove';
type NonScrollEvent = Exclude<Event, 'scroll'>; // 'click' | 'mousemove'

const handleEvent = (event: NonScrollEvent) => {
  console.log(`Handling event: ${event}`);
};

handleEvent('click'); // OK
// handleEvent('scroll'); // Error: Argument of type '"scroll"' is not assignable to parameter of type 'NonScrollEvent'.