refactor: make isPlainObject logic more readable

Author: pi0

src/_utils.ts

@@ -1,16 +1,22 @@
-// From sindresorhus/is-plain-obj
-// MIT License
+// Forked from sindresorhus/is-plain-obj (MIT)
 // Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (https://sindresorhus.com)
 export function isPlainObject(value: unknown): boolean {
  if (value === null || typeof value !== "object") {
  return false;
  }
  const prototype = Object.getPrototypeOf(value);
- return (
- (prototype === null ||
- prototype === Object.prototype ||
- Object.getPrototypeOf(prototype) === null) &&
- !(Symbol.toStringTag in value) &&
- !(Symbol.iterator in value)
- );
+
+ if (
+ prototype !== null &&
+ prototype !== Object.prototype &&
+ Object.getPrototypeOf(prototype) !== null
+ ) {
+ return false;
+ }
+
+ if (Symbol.toStringTag in value || Symbol.iterator in value) {
+ return false;
+ }
+
+ return true;
 }