Generate TypeScript types automatically based on an object

I'm working with a code snippet that looks like this:

import { ApolloClient } from '@apollo/client';

type F = typeof FeaturesManager.features.warrants

export class FeaturesManager {
  static features = {
    warrants: Symbol('WARRANTS'),
  };

  client: ApolloClient<{}>;

  constructor({ client }: { client: ApolloClient<{}> }) {
    this.client = client;
  }

  getFeatureAvailability(feature: F) {

  }
}

new FeaturesManager(new ApolloClient()).getFeatureAvailability(FeaturesManager.features.warrants)

Whenever I update FeaturesManager.features, I also have to change F. What's the best way to address this issue in the code?

UPDATE

Playgroung

Answer №1

If you want to include all the functionalities, one approach is utilizing the keyof method to extract all keys and utilize them for type indexing.

In your provided scenario, the code implementation would resemble:

type F = typeof FeaturesManager.features[keyof typeof FeaturesManager.features]

Alternatively, a more concise option could be:

type ValueOf<T> = T[keyof T];
type F = ValueOf<typeof FeaturesManager.features>

I also observed that symbols are used, which could create complications for TypeScript in distinguishing between them. It might be advantageous to employ enums or strings for features instead as it can lead to improved TypeScript compatibility.

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