Sample Service worker config Angular5

ngsw-config.json

{
  "index": "/index.html",
  "assetGroups": [
    {
      "name": "app",
      "installMode": "prefetch",
      "resources": {
        "files": [
          "/favicon.ico",
          "/index.html",
          "/siteconfig.json"
        ],
        "versionedFiles": [
          "/*.bundle.css",
          "/*.bundle.js",
          "/*.chunk.js"
        ]
      }
   },
    {
      "name": "assets",
      "installMode": "lazy",
      "updateMode": "prefetch",
      "resources": {
        "files": [
          "/assets/**"
        ],
        "urls":[
          "https://fonts.googleapis.com/**"
        ]
      }
    }
  ],
  "dataGroups": [
    {
      "name": "api-performance",
      "urls": [
        "siteconfig.json",
        "/assets/languages/en.json"
      ],
      "cacheConfig": {
        "maxSize": 100,
        "maxAge": "1d",
        "strategy": "performance"
      }
    },
    {
      "name": "api-freshness",
      "urls": [
        "/tenants",
        "/resourceGroups",
        "/roles"
      ],
      "cacheConfig": {
        "maxSize": 100,
        "maxAge": "1h",
        "timeout": "5s",
        "strategy": "freshness"
      }
    }
  ]
}