systemjs-example/src/commonjs/module1.ts

import { ICounter } from "../common/interfaces";

export class CommonJsCounter implements ICounter {
    constructor(private _value:number = 0) {
    }

    public get value(): string {
        return `commonjs ${this._value}`;
    }

    public incr(): void {
        ++this._value;
    }

    public decr(): void {
        --this._value;
    }
}