index.js

'use strict';
var Filter = require('broccoli-filter');
var RSVP = require('rsvp');
var SVGO = require('svgo');

function SvgoFilter(inputTree, options) {
	if (!(this instanceof SvgoFilter)) {
		return new SvgoFilter(inputTree, options);
	}

	Filter.call(this, inputTree);

	this.inputTree = inputTree;
	this.svgo = new SVGO(options);
}

SvgoFilter.prototype = Object.create(Filter.prototype);
SvgoFilter.prototype.constructor = SvgoFilter;

SvgoFilter.prototype.extensions = ['svg'];
SvgoFilter.prototype.targetExtension = 'svg';

SvgoFilter.prototype.processString = function (str) {
	return new RSVP.Promise(function(resolve, reject) {
		this.svgo.optimize(str, function (result) {
			resolve(result.data);
		});
	}.bind(this));
};

module.exports = SvgoFilter;