Scratch for the Tessel 2

helloworld.json

{
	"objName": "Stage",
	"sounds": [],
	"costumes": [],
	"children": [{
		"objName": "Sprite1",
		"scripts": [
			[
				0,
				0,
				[
					["whenGreenFlag"],
					["doForever",
						[
							["broadcast:", "LED_ON"],
							["wait:elapsed:from:", 0.1],
							["broadcast:", "LED_OFF"],
							["wait:elapsed:from:", 0.1]
						]
					]
				]
			]
		],
		"sounds": [],
		"costumes": [],
		"currentCostumeIndex": 0,
		"scratchX": 0,
		"scratchY": 0,
		"scale": 1,
		"direction": 180,
		"rotationStyle": "normal",
		"isDraggable": false,
		"indexInLibrary": 1,
		"visible": true,
		"spriteInfo": {}
	}],
	"info": {
		"spriteCount": 1,
		"flashVersion": "MAC 21,0,0,174",
		"swfVersion": "v445.1",
		"videoOn": false,
		"userAgent": "Scratch 2.0 Offline Editor",
		"scriptCount": 4
	}
}

index.js

const tessel = require('tessel');
const VirtualMachine = require('scratch-vm');

// Create VM instance and load project JSON
const vm = new VirtualMachine();
const project = require('./test/fixtures/helloworld.json');

// (Gross hack) inject opcode override for "broadcast" block
// @todo Replace with proper extensions system
vm.runtime._primitives['event_broadcast'] = function (args, util) {
    console.log(args.BROADCAST_OPTION);
    if (typeof tessel.led === 'undefined') return;
    if (args.BROADCAST_OPTION === 'LED_ON') {
        tessel.led[2].on();
    }
    if (args.BROADCAST_OPTION === 'LED_OFF') {
        tessel.led[2].off();
    }
};

// Start VM
vm.start();
vm.clear();
vm.setCompatibilityMode(false);
vm.setTurboMode(false);

// Load project and simulate "green flag" event
vm.loadProject(JSON.stringify(project)).then(function () {
    vm.greenFlag();
});