import type { Nullable } from './types.js';
import { NotNullExpected } from "./error.js";

export function must<T>(result: Nullable<T>): T {
    if (result === null || result === undefined) {
        throw new NotNullExpected();
    }
    return result;
}

export function must_any<T>(result: Nullable<unknown>): T {
    if (result === null || result === undefined) {
        throw new NotNullExpected();
    }
    return result as T;
}

type ErrType<T> = { new(msg?: string): T }

export function must_err<T, ErrT extends Error>(result: Nullable<T>, errType: ErrType<ErrT>, errMsg?: string): T {
    if (result === null || result === undefined) {
        throw new errType(errMsg);
    }
    return result;
}