chore: improve PathComponent type

Ensure it matches our nested format.

Author: nikku

intersect.d.ts

@@ -81,7 +81,7 @@ export function parsePath(path: Path): PathComponent[];
  * ]
  */
 declare type Path = string | PathComponent[];
-declare type PathComponent = any[];
+declare type PathComponent = [ string, ...number[] ];
 
 declare interface Intersection {
   /**