My interfaces.ts looks as follows:

export const types = ["foo", "bar"] as const;

export type CustomType = typeof types[number];

And I want to check whether a string is a CustomType. When I use includes it gives me an error telling me:

Argument of type 'string' is not assignable to parameter of type '"foo" | "bar"'.

I could use findIndex but is there no other way so I can use includes?

const a = types.includes(value);                       // error
const b = types.findIndex(type => type === value) < 0  // boolean