Typescript interface default values

Question

I have the following interface in TypeScript:

interface IX {
    a: string,
    b: any,
    c: AnotherType
}

I declare a variable of that t

Answer 1

My solution:

I have created wrapper over Object.assign to fix typing issues.

export function assign(...args: T[] | Partial[]): T {
  return Object.assign.apply(Object, [{}, ...args]);
}

Usage:

env.base.ts

export interface EnvironmentValues {
export interface EnvironmentValues {
  isBrowser: boolean;
  apiURL: string;
}

export const enviromentBaseValues: Partial = {
  isBrowser: typeof window !== 'undefined',
};

export default enviromentBaseValues;

env.dev.ts

import { EnvironmentValues, enviromentBaseValues } from './env.base';
import { assign } from '../utilities';

export const enviromentDevValues: EnvironmentValues = assign(
  {
    apiURL: '/api',
  },
  enviromentBaseValues
);

export default enviromentDevValues;