better-auth/dist/client/equality.mjs

The most comprehensive authentication framework for TypeScript.

import { onSet } from "nanostores";
//#region src/client/equality.ts
function isPlainObject(value) {
	if (typeof value !== "object" || value === null) return false;
	const prototype = Object.getPrototypeOf(value);
	return prototype === Object.prototype || prototype === null;
}
/**
* Deep structural equality for JSON-serializable values.
* Handles: primitives, null, arrays, and plain objects.
* Short-circuits on referential equality at every recursion level.
*/
function isJsonEqual(a, b) {
	if (a === b) return true;
	if (Array.isArray(a) && Array.isArray(b)) {
		if (a.length !== b.length) return false;
		for (let i = 0; i < a.length; i++) if (!isJsonEqual(a[i], b[i])) return false;
		return true;
	}
	if (isPlainObject(a) && isPlainObject(b)) {
		const keysA = Object.keys(a);
		const keysB = Object.keys(b);
		if (keysA.length !== keysB.length) return false;
		for (const key of keysA) if (!(key in b) || !isJsonEqual(a[key], b[key])) return false;
		return true;
	}
	return false;
}
/**
* Attach an equality gate to a nanostores atom via `onSet`.
* When `isEqual(currentValue, newValue)` returns true, the `set()` call
* is aborted: no listeners fire, no framework re-renders occur.
*
* Returns the unsubscribe function from `onSet`.
*/
function withEquality(store, isEqual) {
	return onSet(store, ({ newValue, abort }) => {
		if (isEqual(store.value, newValue)) abort();
	});
}
//#endregion
export { isJsonEqual, withEquality };