firebase.json

{
  "hosting":[
    {
      "target": "app1",
    "public": "dist/app1-home",
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ],
      "rewrites": [{
        "source": "/public/**",
        "destination": "/public.html"
      },
        {
          "source": "**",
          "destination": "/index.html"
        }]
    },
    {
      "target": "app2",
      "public": "dist/app2-restaurant",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "rewrites": [{
        "source": "/public/**",
        "destination": "/public.html"
      },
        {
          "source": "**",
          "destination": "/index.html"
        }]
    },
    {
      "target": "app3",
      "public": "dist/app3-orders",
      "ignore": [
        "firebase.json",
        "**/.*",
        "**/node_modules/**"
      ],
      "rewrites": [{
        "source": "/public/**",
        "destination": "/public.html"
      },
        {
          "source": "**",
          "destination": "/index.html"
        }]
    }
  ]
}