Function wgpu::web_sys::js_sys::Reflect::is_extensible

pub fn is_extensible(target: &Object) -> Result<bool, JsValue>

Available on webgl or webgpu only.

The static Reflect.isExtensible() method determines if an object is extensible (whether it can have new properties added to it). It is similar to Object.isExtensible(), but with some differences.

MDN documentation