compilation error at overload when using replacerFunction callback-CodePudding

I have a function that generates random word:

const randomWord = () => {
    return "obbooobb".replace(/([ob])/g, (match: string) => {
        if (match === "o") {
            // something
        }
        if (match === "b") {
            // something
        }
    });
};

Anytime deno launches check before starting runtime it throws following error:

Check file:///root/index.ts
error: TS2769 [ERROR]: No overload matches this call.
    The last overload gave the following error.
        Argument of type '(match: 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'.
    return "obbooobb".replace(/([ob])/g, (match: string) => {
                                                                                                                     ~~~~~~~~~~~~~~~~~~~~
        at file:///root/controllers/data.ts:66:60

TS2771 [ERROR]:     The last overload is declared here.
                replace(searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string;
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                at asset:///lib.es5.d.ts:456:5

deno 1.21.2 (release, x86_64-unknown-linux-gnu)
v8 10.0.139.17
typescript 4.6.2

From initial search i am more or less aware that this has been issue. I seen other stackoverflow and git issues topics related to this problem, but i didnt find most simple way to solve this issue that would help me, maybe someone already encountered similar problem and solved it in simple way.

CodePudding user response：

You haven't specified a return type on the callback passed to replace, and as written it doesn't provide a return value so is inferred to be undefined. Either specify the return type, or make sure all code paths return a value of the expected type (string)