Function get_str 

pub fn get_str<T>(
    target: &Object<T>,
    key: &JsString,
) -> Result<Option<T>, JsValue>
where
    Object<T>: ErasableGenericBorrow<Object<JsValue>> + EncodeTypeDef,
    for<'__wry_bindgen> &'__wry_bindgen Object<T>: BinaryEncode,
    Result<Option<T>, JsValue>: ErasableGenericOwn<Result<Option<JsValue>, JsValue>> + EncodeTypeDef + BatchableResult,

The static Reflect.get() method works like getting a property from an object (target[propertyKey]) as a function.

MDN documentation