@@ -26,7 +26,7 @@ export interface ClassDefinition {
    * Other methods on the class. Note that values should have type 'Function' but TS requires
    * all properties to have a narrower type than the index signature.
    */
-  [x: string]: Type | Function | any[];
+  [x: string]: Type | Function | any[] | undefined;
 }
 
 /**
Original file line number	Diff line number	Diff line change
`@@ -26,7 +26,7 @@ export interface ClassDefinition {`
`26`	`26`	`* Other methods on the class. Note that values should have type 'Function' but TS requires`
`27`	`27`	`* all properties to have a narrower type than the index signature.`
`28`	`28`	`*/`
`29`		`- [x: string]: Type \| Function \| any[];`
	`29`	`+ [x: string]: Type \| Function \| any[] \| undefined;`
`30`	`30`	`}`
`31`	`31`
`32`	`32`	`/**`