How to define type for replacement function in replace method in TypeScript?

I want to define types for replace method in TypeScript but I am getting this error:

No overload matches this call. The last overload gave the following
error.
Argument of type ‘(match: string, value: string) => string | undefined’ is not assignable to parameter of type ‘(substring: string,
…args: any[]) => string’.
Type ‘string | undefined’ is not assignable to type ‘string’.
Type ‘undefined’ is not assignable to type ‘string’.ts(2769)

Here is my code:

const newStr = str.replace(myRegExp, (match: string, value: string) => {
        if (!value) return match;
    }),
);

How can I do this in typescript?

>Solution :

To convert this JavaScript code to TypeScript, you can simply add type annotations for the function parameters and the return type. Here’s an example:

const newStr: string = str.replace(myRegExp, (match: string, value: string): string => {
    if (!value) return match;
});

In this example, the match and value parameters are annotated as string, and the return type of the function is also annotated as string.