tsconfig.json

{
    "include": ["src/**/*.ts"],
    "compilerOptions": {
      "target": "ES6",
      "module": "ESNext",

      /* Strict Type-Checking Options */
      "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. */
      // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
      // "strictPropertyInitialization": true,  /* 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. */

      /* Additional Checks */
      "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. */,

    }
  }