Issue with Typescript not properly augmenting the Window type

root/global.d.ts:

import {GGMessage} from "./GGMessage";
export {}

declare global {
    export interface Window {onWebsocketsMessageReceived: (data: ArrayBuffer) => GGMessage | null}
}

root/src/webSocketProxy.ts:

window.onWebsocketsMessageReceived

ISSUE - The mentioned line results in:

Error:(30, 36) TS2339: Property 'onWebsocketsMessageReceived' does not exist on type 'Window & typeof globalThis'.

Why is this happening? Although I remember it working perfectly before, pinpointing the exact changes that caused this error seems challenging. Nonetheless, all the provided code snippets appear to be correctly written.

tsconfig.json:

{
  "include": [
    "src/**/*"
  ],
  "compilerOptions": {
    "target": "es2016",
    "module": "commonjs",
     "sourceMap": true,
     "outDir": "./dist",
    "strict": true,
     "noImplicitAny": false,
    "strictNullChecks": false,
  }
}
typescript

Answer №1

To define the Window interface, simply add it to your root/global.d.ts file.

declare interface Window {
 onWebsocketsMessageReceived: (data: ArrayBuffer) => GGMessage | null
}

Once added, this declaration will automatically merge with the definition in the lib.dom.d.ts file.

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