Avoid Using Map Objects

Use of the Map object with Lightning Web Security (LWS) enabled can run into issues when the object is serialized. Instead of using a Map instance, you can use a plain JavaScript object in most cases.

If you must use maps, use the set() method to insert key-value pairs instead of adding custom properties. If the data passed in Map must be serialized, pass a custom replacer function to JSON.stringify(...).

Using maps in Lightning web components isn’t supported for both imperative and wired Apex calls.

See Also

• Lightning Web Components Developer Guide: Pass Values to Apex