BodyBalanceEvaluation/frontend/src/renderer/main/preload.js

const { contextBridge } = require('electron');

contextBridge.exposeInMainWorld('electronAPI', {
  generateReportPdf: (payload) => {
    try {
      return window?.electron?.ipcRenderer?.invoke('generate-report-pdf', payload)
    } catch {}
  },
  getBackendUrl: () => process.env.BACKEND_URL || 'http://localhost:5000',
  getSocketTransports: () => {
    const allowPolling = process.env.ALLOW_POLLING === '1'
    return allowPolling ? ['websocket', 'polling'] : ['websocket']
  }
});