CODEWITHSUNDEEP
javascripttypescriptimport
Sebastiaan
Sebastiaan

Reputation: 375

How to use Typescript typing for a dynamically generated class?

I am implementing a class like the following:

import * as User from './user';

export class Database {
  constructor() {
    for (const method in User) {
      this[method] = User[method];
    }
  }
}

Where the ./user file contains:

export async function findById(id: number): Promise<User | null> {
  return //
}

export async function findByName(name: string): Promise<User | null> {
  return //
}

I can now use the Database class to perform operations, however there are no TypeScript hints since these are lost by dynamically reassigning the methods. I also have to include a @ts-nocheck in the Database file as I am otherwise getting the error:

Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'typeof import

Implementing a predefined interface also will not work due to it not registering the dynamic types (which is logical as these are loaded in at runtime). How do I implement a dynamic interface for this?

Big thanks

Upvotes: 2

Views: 284

Answers (1)

Sebastiaan
Sebastiaan

Reputation: 375

With suggestions from Keith I changed it to:

import * as User from './user';

export const Database = class _Database {
  constructor() {
    Object.assign(this, User);
  }
} as { new (): typeof User };

This solved the TypeScript errors (yay)

Upvotes: 1

Related Questions