Function mozjs::jsapi::JS_InitializePropertiesFromCompatibleNativeObject

pub unsafe extern "C" fn JS_InitializePropertiesFromCompatibleNativeObject(
    cx: *mut JSContext,
    dst: Handle<*mut JSObject>,
    src: Handle<*mut JSObject>
) -> bool

Copy the own properties of src to dst in a fast way. src and dst must both be native and must be in the compartment of cx. They must have the same class, the same parent, and the same prototype. Class reserved slots will NOT be copied.

dst must not have any properties on it before this function is called.

src must have been allocated via JS_NewObjectWithoutMetadata so that we can be sure it has no metadata that needs copying to dst. This also means that dst needs to have the compartment global as its parent. This function will preserve the existing metadata on dst, if any.