How to register global TypeScript Enum in Node.js

I want to make my TypeScript Enums global so I don't need to import them across my application.

What I have so far:

read-state.enum.ts

export enum ReadState {
    Unread = 4000,
    Read = 4001
}

enums.ts

import { ReadState } from './read-state.enum';

const enums = {
    ReadState
}

global['Enums'] = enums;

declare var Enums: typeof enums;

Then in index.ts

import './enums'; // do this once to initialize enums

var _enums = Enums; // [ts] Cannot find name 'Enums'.

While at runtime this might work, I'm not able to reference the enums through the declare var Enums: typeof enums; because the file is a module.

How can I reference this type definition without importing the module while keeping future enum definitions in separate files?

UPDATE: I also need to set the return type of a function to be the ReadState enum.

Based on the current selected answer I have this:

import { ReadState } from './read-state.enum';

const enums = {
  ReadState: ReadState
}

declare global {
  const Enums: typeof enums;
}

In another file I would like to set the return type on these functions but TypeScript is unhappy:

function getState1(): Enums.ReadState {
  return Enums.ReadState.Unread;
}

function getState2(): typeof Enums.ReadState {
  return Enums.ReadState.Read;
}