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// Defaults
var defaultOptions = {
	format: 'image/png',
	quality: 0.92,
	width: undefined,
	height: undefined,
	Canvas: undefined,
	crossOrigin: undefined
};

// Return Promise
var mergeImages = function (sources, options) {
	if ( sources === void 0 ) sources = [];
	if ( options === void 0 ) options = {};

	return new Promise(function (resolve) {
	options = Object.assign({}, defaultOptions, options);

	// Setup browser/Node.js specific variables
	var canvas = options.Canvas ? new options.Canvas() : window.document.createElement('canvas');
	var Image = options.Canvas ? options.Canvas.Image : window.Image;
	if (options.Canvas) {
		options.quality *= 100;
	}

	// Load sources
	var images = sources.map(function (source) { return new Promise(function (resolve, reject) {
		// Convert sources to objects
		if (source.constructor.name !== 'Object') {
			source = { src: source };
		}

		// Resolve source and img when loaded
		var img = new Image();
		img.crossOrigin = options.crossOrigin;
		img.onerror = function () { return reject(new Error('Couldn\'t load image')); };
		img.onload = function () { return resolve(Object.assign({}, source, { img: img })); };
		img.src = source.src;
	}); });

	// Get canvas context
	var ctx = canvas.getContext('2d');

	// When sources have loaded
	resolve(Promise.all(images)
		.then(function (images) {
			// Set canvas dimensions
			var getSize = function (dim) { return options[dim] || Math.max.apply(Math, images.map(function (image) { return image.img[dim]; })); };
			canvas.width = getSize('width');
			canvas.height = getSize('height');

			// Draw images to canvas
			images.forEach(function (image) {
				ctx.globalAlpha = image.opacity ? image.opacity : 1;
				return ctx.drawImage(image.img, image.x || 0, image.y || 0);
			});

			if (options.Canvas && options.format === 'image/jpeg') {
				// Resolve data URI for node-canvas jpeg async
				return new Promise(function (resolve) {
					canvas.toDataURL(options.format, {
						quality: options.quality,
						progressive: false
					}, function (err, jpeg) {
						if (err) {
							throw err;
						}
						resolve(jpeg);
					});
				});
			}

			// Resolve all other data URIs sync
			return canvas.toDataURL(options.format, options.quality);
		}));
});
};

export default mergeImages;
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