fix: websocket and fetch typings

Signed-off-by: blu3beri <berend@animo.id>

src/utils/fetch.ts

@@ -1,20 +1,24 @@
 import { isNodeJS, isReactNative } from './environment'
 
-let fetch
+type Fetch = {
+  (input: RequestInfo, init?: RequestInit): Promise<Response>
+}
+
+let fetch: Fetch
 let Headers
 let Request
 let Response
 
 // NodeJS doesn't have fetch by default
-if (!fetch && isNodeJS()) {
+if (isNodeJS()) {
   // eslint-disable-next-line @typescript-eslint/no-var-requires
   const nodeFetch = require('node-fetch')
 
   fetch = nodeFetch.default
   Headers = nodeFetch.Headers
   Request = nodeFetch.Request
   Response = nodeFetch.Response
-} else if (!fetch && isReactNative()) {
+} else if (isReactNative()) {
   fetch = global.fetch
   Headers = global.Headers
   Request = global.Request

src/utils/ws.ts

@@ -1,14 +1,23 @@
 import { isNodeJS, isReactNative } from './environment'
 
-let WebSocket
+type WS = {
+  new (url: string, protocols?: string | string[] | undefined): WebSocket
+  prototype: WebSocket
+  readonly CLOSED: number
+  readonly CLOSING: number
+  readonly CONNECTING: number
+  readonly OPEN: number
+}
+
+let WebSocket: WS
 
 // NodeJS doesn't have WebSocket by default
-if (!WebSocket && isNodeJS()) {
+if (isNodeJS()) {
   // eslint-disable-next-line @typescript-eslint/no-var-requires
   const nodeWebSocket = require('ws')
 
   WebSocket = nodeWebSocket
-} else if (!WebSocket && isReactNative()) {
+} else if (isReactNative()) {
   WebSocket = global.WebSocket
 } else {
   WebSocket = window.WebSocket.bind(window)