tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    
    "strict": true, /* Enable all strict type-checking options. */
    "noImplicitReturns": true,/* Firebase's default lint options make these pretty required */
    "noUnusedLocals": true,/* Firebase's default lint options make these pretty required */

    "module": "esnext",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "lib": [
      "es2018",
      "dom"
    ],
    "paths": {
      "@app/*": ["src/app/*"],
      "environments/*": ["src/environments/*"
    ],
  },
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }
}