perf: use polymophism instead duck test

src/util/assert.ts

@@ -1,6 +1,6 @@
 import { AssertionError } from './error'
 
-export default function (predicate: any, message?: string) {
+export default function<T> (predicate: T | null | undefined, message?: string) {
   if (!predicate) {
     message = message || `expect ${predicate} to be true`
     throw new AssertionError(message)