Array.filter(Boolean)

array.d.ts

declare global {
  interface Array<T> {
    filter(predicate: typeof Boolean): Exclude<T, undefined | null | false | 0 | ''>[]
  }
}

export default global

index.ts

type Person = {
  name: string;
}

const people = [{ name: 'alice' }, null, { name: 'bob' }];

people.filter(() => 1).forEach(person => console.log(person.name)); // With StrictNullChecks enabled, compiler rightfully errors, knowing person can be null
people.filter(Boolean).forEach(person => console.log(person.name)); // Even with StrictNullChecks enabled, compiler is now cool, knowing person cannot be null