emitter.txt

const heartPath = document.createElementNS("http://www.w3.org/2000/svg", "path");
heartPath.setAttribute(
	"d",
	"M316.722,29.761c66.852,0,121.053,54.202,121.053,121.041c0,110.478-218.893,257.212-218.893,257.212S0,266.569,0,150.801 C0,67.584,54.202,29.761,121.041,29.761c40.262,0,75.827,19.745,97.841,49.976C240.899,49.506,276.47,29.761,316.722,29.761z"
);


const heartShape = document.createElementNS("http://www.w3.org/2000/svg", "svg");
heartShape.setAttribute("viewBox", "0 0 512 512");
heartShape.setAttribute("height", "20");
heartShape.setAttribute("width", "20");
heartShape.appendChild(heartPath);


party.scene.current.createEmitter({
	emitterOptions: {
		loops: 1,
		lifetime: 0.01,
		useGravity: false,
		modules: [
			new party.ModuleBuilder()
				.drive("size")
				.by((t) =>  0.1 + 0.2 * (Math.sin(t *2) + 1))
				.build(),
			new party.ModuleBuilder()
				.drive("opacity")
				.by((t) => 1-t)
				.through("lifetime")
				.build(),
		],
	},
	emissionOptions: {
		rate: 0,
		bursts: [{ time: 0, count: 6}],
		sourceSampler: party.sources.dynamicSource(runButton),
		angle: party.variation.range(0, 360),
		initialSpeed: 60,
		initialLifetime: 1,
		initialColor: party.variation.gradientSample(
			party.Gradient.simple(party.Color.fromHex("#ffa68d"), party.Color.fromHex("#fd3a84"))
		),
	},
	rendererOptions: {
		shapeFactory: heartShape,
		applyLighting: undefined,
	},
});