‘compile-time’ way to get all property names defined interface

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This is possible by using custom transformers introduced by https://github.com/Microsoft/TypeScript/pull/13940, which is available in typescript >= 2.4.1.

My npm package, ts-transformer-keys, is a good example.

import { keys } from 'ts-transformer-keys';

interface Props {
  id: string;
  name: string;
  age: number;
}
const keysOfProps = keys<Props>();

console.log(keysOfProps); // ['id', 'name', 'age']

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