Function delete_property_str 

pub fn delete_property_str<T>(
    target: &Object<T>,
    key: &JsString,
) -> Result<bool, JsValue>
where
    Object<T>: ErasableGenericBorrow<Object<JsValue>>,

The static Reflect.deleteProperty() method allows to delete properties. It is like the delete operator as a function.

MDN documentation