tsconfig.json

{
  "compilerOptions": {
    "target": "es2017" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */ ,
    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */ ,
    "lib": [
      "es5",
      "es6",
      "es2017",
      "esnext",
      "dom"
    ],
    "declaration": true,
    "outDir": "dist",
    "rootDir": "src",
    "sourceMap": true,
    "strict": true /* Enable all strict type-checking options. */ ,
    "noImplicitAny": true /* Raise error on expressions and declarations with an implied 'any' type. */ ,
    "strictNullChecks": true /* Enable strict null checks. */ ,
    "strictFunctionTypes": true /* Enable strict checking of function types. */ ,
    "strictPropertyInitialization": false /* Enable strict checking of property initialization in classes. */ ,
    "noImplicitThis": true /* Raise error on 'this' expressions with an implied 'any' type. */ ,
    "alwaysStrict": true /* Parse in strict mode and emit "use strict" for each source file. */ ,
    "noUnusedLocals": true /* Report errors on unused locals. */ ,
    "noUnusedParameters": true /* Report errors on unused parameters. */ ,
    "noImplicitReturns": true /* Report error when not all code paths in function return a value. */ ,
    "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */ ,
    "moduleResolution": "node",
    "types": ["reflect-metadata", "node"],
    "esModuleInterop": false /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */ ,
    "experimentalDecorators": true /* Enables experimental support for ES7 decorators. */ ,
    "emitDecoratorMetadata": true /* Enables experimental support for emitting type metadata for decorators. */
  },
  "compileOnSave": true,
  "include": [
    "src"
  ],
  "exclude": [
    "node_modules",
    "src/mobile"
  ]
}