No overload matches this call. Type ‘string’ is not assignable to type ‘Signals’

This sometimes happens when you have passed an incorrect number of arguments to an anonymous function:

    Object.keys(data).reduce((key: string) => {

    }, {}); 

will raise error:

No overload matches this call. Overload 1 of 3

Pass it the correct number of arguments:

    Object.keys(data).reduce((acc: any, key: string) => {
    }, {});