app.ts

#!/usr/bin/env node
import 'source-map-support/register';
import cdk = require('@aws-cdk/core');
import ecs = require("@aws-cdk/aws-ecs");
import ecsPatterns = require("@aws-cdk/aws-ecs-patterns");

export class WebStack extends cdk.Stack {
    constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
        super(scope, id, props);
        this.createECSCluster();
    }

    createECSCluster() {
        const ecsCluster = new ecs.Cluster(this, 'ecsCluster');
        new ecsPatterns.ApplicationLoadBalancedFargateService(this, 'Service', {
            cluster: ecsCluster,
            taskImageOptions: {
                image: ecs.ContainerImage.fromAsset('.')
            },
        });
    }
}

const app = new cdk.App();
new WebStack(app, 'WebStack');

app.synth();