banner_studio/apps/web/lib/engine.ts

'use client';
// Promise-singleton init for the browser layout engine. The first caller
// kicks off the wasm fetch + font registration; subsequent callers get
// the same in-flight promise. Survives App Router client navigations.

import { initLayoutEngine } from '@banner-studio/layout-engine/browser';

let promise: Promise<void> | null = null;

export function ensureBrowserEngine(): Promise<void> {
  if (!promise) {
    promise = initLayoutEngine({
      fonts: [
        { family: 'Inter', weight: 400, path: '/fonts/Inter-Regular.ttf' },
        { family: 'Inter', weight: 700, path: '/fonts/Inter-Bold.ttf' }
      ]
    });
  }
  return promise;
}