[React Typescript] Well typed a React Context provider
import React from "react";
import { Equal, Expect } from "../helpers/type-utils";
const createRequiredContext = <T extends any>() => {
const context = React.createContext<T | null>(null);
const useContext = <T extends any>() => {
const contextValue = React.useContext(context);
if (contextValue === null) {
throw new Error("Context value is null");
}
return contextValue;
};
return [useContext, context.Provider] as const;
};
const [useUser, UserProvider] = createRequiredContext<{
name: string;
}>();
const [useTheme, ThemeProvider] = createRequiredContext<{
primaryColor: string;
}>();
const Child = () => {
const user = useUser();
type test = Expect<
Equal<
typeof user,
{
name: string;
}
>
>;
const theme = useTheme();
type test2 = Expect<
Equal<
typeof theme,
{
primaryColor: string;
}
>
>;
return null;
};
const Parent = () => {
return (
<>
<UserProvider value={{ name: "Matt" }}>
<ThemeProvider
value={{
primaryColor: "blue",
}}
>
<Child />
</ThemeProvider>
</UserProvider>
</>
);
};
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