How to extend package types?-CodePudding

Trying to extend Electron app.

import { app } from "electron"

app.foo = "bar" // Property 'foo' does not exist on type 'App'.ts(2339)

Above works if I use //@ts-ignore.

Trying to setup a .d.ts override but what I came up with doesn’t work (just getting started with overrides).

electron.d.ts

import { App as ElectronApp } from "electron"

declare module Electron {
  export interface App extends ElectronApp {
    inspect: boolean
  }
}

CodePudding user response：

Declaration merging is what I was looking for.

electron.d.ts

declare namespace Electron {
  export interface App {
    inspect: boolean
  }
}

CodePudding user response：

You can import app under a private name and then typecast it internally to be whatever you like.

import { app as _app } from "electron"

interface MyCustomProperties {
  foo: string;
}

const app = _app as (typeof _app & MyCustomProperties);
app.foo = "bar";