In the code below, I specified that setLocale should receive a value of type Locale as a parameter via LocaleContextValue.

But why doesn’t the setLocale function throw an error if I don’t pass any value as a parameter?

Even if I make it return a string type like () => { return “hello” }, it doesn’t throw any error.

import { createContext, ReactNode, useContext, useState } from "react";

type Locale = "ko" | "en";

interface LocaleContextValue {
  locale: Locale;
  setLocale: (value: Locale) => void;
}

const LocaleContext = createContext<LocaleContextValue>({
  locale: "ko",
  setLocale: () => {},
  // setLocale: () => { return "hello"; },
  // No errors occurred.
});