Retrieve the tuple containing parameter types in a constructor

Here is the code snippet I am currently working with:

class Route {
  constructor(
    public method: 'get' | 'post' | 'update' | 'delete',
    public path: string,
    public handler: () => string,
  ) {}
}

class Router {
  constructor(private routes: (Route | Parameters<typeof Route.constructor>)[] = []) {}
}

My goal is to make the Router class capable of accepting an array that includes either a Route object or just an array of arguments for constructing new Route instances. Here's how it should work:

const router = new Router([
  new Route('get', '/', () => 'Hello, world!'),

  // or
  ['get', '/', () => 'Hello, world!'],
]);

I have tried using the Parameters feature to retrieve function parameters as tuples. However, when attempting to apply this to constructors, I encounter the following error message:

Type 'Function' does not satisfy the constraint '(...args: any) => any'.

Despite searching online extensively, I have not found a solution that addresses my specific scenario.

Therefore, I am seeking advice on whether there is a way to accomplish this task successfully.

Answer №1

It is important to utilize ConstructorParameters directly with typeof Route

class Route {
    constructor(
        public method: 'get' | 'post' | 'update' | 'delete',
        public path: string,
        public handler: () => string,
    ) { }
}

class Router {
    constructor(private routes: (Route | ConstructorParameters<typeof Route>)[] = []) { }
}

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