How to add types checker for the Jest in the TypeScript app?

I need to add some type checker to the Jest. It must look somehow like expect(someVar).toBeType('string') and expect(someVar).toBeType(['string', 'object']).

I tried to add some checker-helper, but it looks a little bit ugly.

const toBeType = (arg:any, type:string) => {
    const argType = typeof arg;

    if (argType !== type)
        throw new Error(`Expected '${type}' but got '${argType}' for 'arg'.`);
};

I want to add similar functionality to the jest namespace to have ability to call type checker like expect(someVar).toBeType('boolean').