ngsw-config.json

{
  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
  "index": "/index.html",
  "dataGroups":
  [
    {
      "name": "api",
      "urls": ["/api"],
      "cacheConfig": {
        "maxSize": 0,
        "maxAge": "0u",
        "strategy": "freshness"
      }
    }
  ],
  "assetGroups": [
    {
      "name": "app",
      "installMode": "prefetch",
      "resources": {
        "files": [
          "/favicon.ico",
          "/index.html",
          "/manifest.webmanifest",
          "/*.css",
          "/*.js"
        ]
      }
    }, {
      "name": "assets",
      "installMode": "lazy",
      "updateMode": "prefetch",
      "resources": {
        "files": [
          "/assets/**",
          "/*.(eot|svg|cur|jpg|png|png?default=blank&size=25webp|gif|otf|ttf|woff|woff2|ani)"
        ]
      }
    }, {
      "name": "external_assets",
      "resources": {
        "urls": [
          "https://maxcdn.bootstrapcdn.com/bootstrap/**",
          "https://fonts.googleapis.com/**",
          "https://www.gravatar.com/avatar/**"
        ]
      }
    }
  ]
}