Next.js route handler for better method safety

route-handler.ts

import type { NextApiRequest, NextApiResponse } from "next";

type HttpMethod = "GET" | "POST" | "PUT" | "DELETE";
type HttpHandler = (request: NextApiRequest, response: NextApiResponse) => void;

interface RouteHandlerParams {
  GET?: HttpHandler;
  POST?: HttpHandler;
  PUT?: HttpHandler;
  DELETE?: HttpHandler;
}

const RouteHandler = (handlers: RouteHandlerParams) => {
  return async (request: NextApiRequest, response: NextApiResponse) => {
    const method = request.method as HttpMethod;
    const handler = handlers[method];

    if (!handler) {
      return response.status(405).send("Method not allowed");
    }

    return await handler!(request, response);
  };
}

export default RouteHandler;