no-any-union.md

no-any-union

Forbids to include any in a union. When any is used in a union type, the resulting type is still any.

Bad:

function f(x: string | any): void;

Good:

function f(x: string): void;

Or:

function f(x: any): void;

Or:

function f(x: string | object): void;

While the string portion of this type annotation may look useful, it in fact offers no additional typechecking over simply using any.