Fix typedoc build

Author: winterbe

package.json

@@ -15,7 +15,7 @@
     "docs-publish": "yarn run docs && touch docs/.nojekyll && gh-pages -d docs -t",
     "build": "rimraf lib && rimraf lib-umd && yarn run lint && tsc && yarn test && webpack && size-limit",
     "build-prod": "yarn run build && yarn run docs-publish",
-    "prepublishOnly": "yarn run build"
+    "prepublishOnly": "yarn run build-prod"
   },
   "author": "Benjamin Winterberg",
   "homepage": "http://winterbe.com",

src/createComparatorFactory.ts

@@ -58,7 +58,7 @@ function compareByDescending<T>(keyOrSelector: any): Comparator<T> {
 function asSelector<T>(keyOrSelector: (item: T) => any | string): (item: T) => any {
     return typeof keyOrSelector === "function"
         ? keyOrSelector
-        : (item: T) => (item as any)[keyOrSelector];
+        : (item: T) => (item as any)[keyOrSelector as string];
 }
 
 function naturalCompare<T>(a: T, b: T): number {