@shopify/shopify-app-remix/src/server/authenticate/helpers/app-bridge-url.ts

Shopify Remix - to simplify the building of Shopify Apps with Remix

import {APP_BRIDGE_URL} from '../const';

let appBridgeUrlOverride: string | undefined;
export function setAppBridgeUrlOverride(url: string) {
  appBridgeUrlOverride = url;
}

export function appBridgeUrl() {
  return appBridgeUrlOverride || APP_BRIDGE_URL;
}