Assume you have some site deployed to Firebase Hosting and want to add a temporary redirect from your app.
You have to add a redirects array to your firebase.json to hosting property.
{
"hosting": {
"public": "dist",
"redirects": [
{
"source": "/",
"destination": "https://akhromieiev.com",
"type": 301
}
],
"ignore": ["firebase.json", "**/.*", "**/node_modules/**"]
}
}