Support plain objects (#3)

Author: felixfbecker

index.js

@@ -11,7 +11,16 @@ class AggregateError extends Error {
 			throw new TypeError(`Expected input to be iterable, got ${typeof errors}`);
 		}
 
-		errors = Array.from(errors).map(err => err instanceof Error ? err : new Error(err));
+		errors = Array.from(errors).map(err => {
+			if (err instanceof Error) {
+				return err;
+			}
+			if (err && typeof err === 'object') {
+				// Handle plain error objects with message property and/or possibly other metadata
+				return Object.assign(new Error(err.message), err);
+			}
+			return new Error(err);
+		});
 
 		let message = errors.map(err => cleanInternalStack(cleanStack(err.stack))).join('\n');
 		message = '\n' + indentString(message, 4);

readme.md

@@ -15,7 +15,7 @@ $ npm install --save aggregate-error
 ```js
 const AggregateError = require('aggregate-error');
 
-const err = new AggregateError([new Error('foo'), 'bar']);
+const err = new AggregateError([new Error('foo'), 'bar', {message: 'baz'}]);
 
 throw err;
 /*
@@ -24,6 +24,8 @@ AggregateError:
         at Object.<anonymous> (/Users/sindresorhus/dev/aggregate-error/example.js:3:33)
     Error: bar
         at Object.<anonymous> (/Users/sindresorhus/dev/aggregate-error/example.js:3:13)
+    Error: baz
+        at Object.<anonymous> (/Users/sindresorhus/dev/aggregate-error/example.js:3:13)
     at AggregateError (/Users/sindresorhus/dev/aggregate-error/index.js:19:3)
     at Object.<anonymous> (/Users/sindresorhus/dev/aggregate-error/example.js:3:13)
     at Module._compile (module.js:556:32)
@@ -41,18 +43,22 @@ for (const el of err) {
 }
 //=> [Error: foo]
 //=> [Error: bar]
+//=> [Error: baz]
 ```
 
 
 ## API
 
 ### AggregateError(errors)
 
-Returns an `Error` that is also an [`iterator`](https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Iterators_and_Generators) for the individual errors.
+Returns an `Error` that is also an [`Iterable`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators#Iterables) for the individual errors.
 
 #### errors
 
-Type: `Iterable<Error|string>`
+Type: `Iterable<Error|Object|string>`
+
+If a string, a new `Error` is created with the string as the error message.<br>
+If a non-Error object, a new `Error` is created with all properties from the object copied over.
 
 
 ## License

test.js

@@ -2,9 +2,19 @@ import test from 'ava';
 import AggregateError from './';
 
 test(t => {
-	const err = new AggregateError([new Error('foo'), 'bar']);
+	const err = new AggregateError([
+		new Error('foo'),
+		'bar',
+		{message: 'baz', code: 'EBAZ'},
+		{code: 'EQUX'}
+	]);
 	console.log(err);
 	t.regex(err.message, /Error: foo\n {8}at /);
 	t.regex(err.message, /Error: bar\n {8}at /);
-	t.deepEqual(Array.from(err), [new Error('foo'), new Error('bar')]);
+	t.deepEqual(Array.from(err), [
+		new Error('foo'),
+		new Error('bar'),
+		Object.assign(new Error('baz'), {code: 'EBAZ'}),
+		Object.assign(new Error(), {code: 'EQUX'})
+	]);
 });