tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "strictNullChecks": true,
    "baseUrl": "./src",
    "importHelpers": true,
    "paths": {
      "@app/*": ["app/*"],
      "@env/*": ["environments/*"]
    },
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "module": "es2015",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types",
      "./src/app/shared/operators/type.definitions.d.ts"
    ],
    "lib": ["es2017", "dom"]
  }
}