TS1056 - Accessors only available ... tsc not picking up tsconfig.json

Question

For code examples, scroll below. First section contains the TypeScript, second one the tsconfig.json and package.json. Using tsc (v2.1.6).

The question I have is how can I detect if typescript is picking up my tsconfig.json, see github repo where I'm runningot the issue: https://github.com/pluralsight-courses/typescript-fundamentals/tree/master/003-ClassesAndInterface.

When compiling commandline on with tsc - I get the error src/index.ts(17,9): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. - but in tsconfig I made sure it is targetting ES5 or up... I don't see what's going wrong/or what I am overlooking here.

TypeScript index.ts

class Engine {
    constructor(public horsePower: number,
        public engineType: string) {
    }
}
class Car {
    // Fields
    private _engine: Engine;
    // Constructor(s)
    constructor(engine: Engine) {
        this.engine = engine;
    }
    // Properties
    get engine(): Engine { return this._engine; }
    set engine(value: Engine) {
        if (value == undefined) throw 'Supply an Engine!';
        this._engine = value;
    }
    // Functions
    start() { return `Started ${this.engine}.`; }
    stop() { return `Stopped ${this.engine}.`; }
}

tsconfig.json

{
    "compileOnSave": true,
    "compilerOptions": {
        "module": "commonjs",
        "noImplicitAny": true,
        "sourceMap": true,
        "outDir": "app"
    },
    "include": [
        "src/**/*.ts"
    ],
    "exclude": [
        "node_modules"
    ]
}

package.json

{
  "name": "classesandinterfaces",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "npm run tsc && node app/index.js",
    "tsc": "tsc --project ./tsconfig.json",
    "tscver": "tsc --version"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "typescript": "2.1.6"
  }
}