add some babel stuff

node_modules/es-abstract/helpers/assign.js

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+var has = Object.prototype.hasOwnProperty;
+module.exports = function assign(target, source) {
+	if (Object.assign) {
+		return Object.assign(target, source);
+	}
+	for (var key in source) {
+		if (has.call(source, key)) {
+			target[key] = source[key];
+		}
+	}
+	return target;
+};

node_modules/es-abstract/helpers/isFinite.js

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+var $isNaN = Number.isNaN || function (a) { return a !== a; };
+
+module.exports = Number.isFinite || function (x) { return typeof x === 'number' && !$isNaN(x) && x !== Infinity && x !== -Infinity; };

node_modules/es-abstract/helpers/isNaN.js

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+module.exports = Number.isNaN || function isNaN(a) {
+	return a !== a;
+};

node_modules/es-abstract/helpers/isPrimitive.js

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+module.exports = function isPrimitive(value) {
+	return value === null || (typeof value !== 'function' && typeof value !== 'object');
+};

node_modules/es-abstract/helpers/mod.js

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+module.exports = function mod(number, modulo) {
+	var remain = number % modulo;
+	return Math.floor(remain >= 0 ? remain : remain + modulo);
+};

node_modules/es-abstract/helpers/sign.js

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+module.exports = function sign(number) {
+	return number >= 0 ? 1 : -1;
+};