Remove unneeded ts-expect-error

Author: wooorm

lib/state.js

@@ -249,7 +249,6 @@ function all(parent) {
  */
 function inherit(from, to) {
   /** @type {Record<string, unknown> | undefined} */
-  // @ts-expect-error: custom data.
   const left = from.data
   /** @type {Record<string, unknown> | undefined} */
   let right