define([
    'dojo/_base/declare',
    'JBrowse/Plugin'
],
function (
    declare,
    JBrowsePlugin
) {
    return declare(JBrowsePlugin, {
        constructor: function (/* args */) {
            if (!Array.prototype.find) {
                Object.defineProperty(Array.prototype, 'find', {
                    value: function (predicate) {
                        // 1. Let O be ? ToObject(this value).
                        if (this == null) {
                            throw new TypeError('"this" is null or not defined');
                        }

                        var o = Object(this);

                        // 2. Let len be ? ToLength(? Get(O, "length")).
                        var len = o.length >>> 0;

                        // 3. If IsCallable(predicate) is false, throw a TypeError exception.
                        if (typeof predicate !== 'function') {
                            throw new TypeError('predicate must be a function');
                        }

                        // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
                        var thisArg = arguments[1];

                        // 5. Let k be 0.
                        var k = 0;

                        // 6. Repeat, while k < len
                        while (k < len) {
                            // a. Let Pk be ! ToString(k).
                            // b. Let kValue be ? Get(O, Pk).
                            // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
                            // d. If testResult is true, return kValue.
                            var kValue = o[k];
                            if (predicate.call(thisArg, kValue, k, o)) {
                                return kValue;
                            }
                            // e. Increase k by 1.
                            k++;
                        }

                        // 7. Return undefined.
                        return undefined;
                    }
                });
            }
            console.log('MultiBigWig plugin starting');
        }
    });
});
