Index: node_modules/aggregate-error/index.js
===================================================================
--- node_modules/aggregate-error/index.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/aggregate-error/index.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,47 @@
+'use strict';
+const indentString = require('indent-string');
+const cleanStack = require('clean-stack');
+
+const cleanInternalStack = stack => stack.replace(/\s+at .*aggregate-error\/index.js:\d+:\d+\)?/g, '');
+
+class AggregateError extends Error {
+	constructor(errors) {
+		if (!Array.isArray(errors)) {
+			throw new TypeError(`Expected input to be an Array, got ${typeof errors}`);
+		}
+
+		errors = [...errors].map(error => {
+			if (error instanceof Error) {
+				return error;
+			}
+
+			if (error !== null && typeof error === 'object') {
+				// Handle plain error objects with message property and/or possibly other metadata
+				return Object.assign(new Error(error.message), error);
+			}
+
+			return new Error(error);
+		});
+
+		let message = errors
+			.map(error => {
+				// The `stack` property is not standardized, so we can't assume it exists
+				return typeof error.stack === 'string' ? cleanInternalStack(cleanStack(error.stack)) : String(error);
+			})
+			.join('\n');
+		message = '\n' + indentString(message, 4);
+		super(message);
+
+		this.name = 'AggregateError';
+
+		Object.defineProperty(this, '_errors', {value: errors});
+	}
+
+	* [Symbol.iterator]() {
+		for (const error of this._errors) {
+			yield error;
+		}
+	}
+}
+
+module.exports = AggregateError;