Prevent invalid keys from being passed in options.

src/rollup.js

@@ -2,11 +2,33 @@ import Promise from 'es6-promise/lib/es6-promise/promise.js';
 import { basename } from './utils/path.js';
 import { writeFile } from './utils/fs.js';
 import { keys } from './utils/object.js';
+import validateKeys from './utils/validateKeys.js';
 import SOURCEMAPPING_URL from './utils/sourceMappingURL.js';
 import Bundle from './Bundle.js';
 
 export const VERSION = '<@VERSION@>';
 
+const ALLOWED_KEYS = [
+	'entry',
+	'dest',
+	'plugins',
+	'external',
+	'onwarn',
+	'indent',
+	'format',
+	'moduleName',
+	'sourceMap',
+	'intro',
+	'outro',
+	'banner',
+	'footer',
+	'globals',
+	'transform',
+	'load',
+	'resolveId',
+	'resolveExternal'
+];
+
 export function rollup ( options ) {
 	if ( !options || !options.entry ) {
 		return Promise.reject( new Error( 'You must supply options.entry to rollup' ) );
@@ -16,6 +38,8 @@ export function rollup ( options ) {
 		return Promise.reject( new Error( 'The `transform`, `load`, `resolveId` and `resolveExternal` options are deprecated in favour of a unified plugin API. See https://github.com/rollup/rollup/wiki/Plugins for details' ) );
 	}
 
+	validateKeys( options, ALLOWED_KEYS );
+
 	const bundle = new Bundle( options );
 
 	return bundle.build().then( () => {

src/utils/validateKeys.js

@@ -0,0 +1,11 @@
+import { keys } from './object.js';
+
+export default function validateKeys ( object, allowedKeys ) {
+	const actualKeys = keys( object );
+
+	actualKeys.forEach( key => {
+		if ( allowedKeys.indexOf( key ) < 0 ) {
+			throw new Error( `Unexpected key '${ key }' found, expected one of: ${ allowedKeys.join( ', ' ) }` );
+		}
+	});
+}