add node modules to repo

app/node_modules/array-find-index/index.js

@@ -0,0 +1,25 @@
+'use strict';
+module.exports = function (arr, predicate, ctx) {
+	if (typeof Array.prototype.findIndex === 'function') {
+		return arr.findIndex(predicate, ctx);
+	}
+
+	if (typeof predicate !== 'function') {
+		throw new TypeError('predicate must be a function');
+	}
+
+	var list = Object(arr);
+	var len = list.length;
+
+	if (len === 0) {
+		return -1;
+	}
+
+	for (var i = 0; i < len; i++) {
+		if (predicate.call(ctx, list[i], i, list)) {
+			return i;
+		}
+	}
+
+	return -1;
+};