Break sinon.spy(Component.prototype, 'method')

描述

TypeError: Attempted to wrap undefined property undefined as function
...

貢獻者指南

技術棧

javascript

領域

frontend

議題類型

bug

難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。

3

預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。

1-3 hours

活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。

stale

清晰度議題是否清楚說明預期改動、驗收標準和下一步。

needs investigation

前置要求

basic understanding of JavaScript decoratorsfamiliarity with sinon spy

新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。

30

研究方向

The issue occurs when using @autobind on a class component, then attempting to spy on a prototype method with sinon.spy. The error suggests that the property is undefined, likely because @autobind replaces the method with a getter or redefines properties. To reproduce, create a simple React component with @autobind on a method and test using sinon.spy(Component.prototype, 'method'). Investigate the autobind decorator source code (especially the core decorator logic) to understand how it binds methods and how that interferes with sinon's prototype spying. Consider if a workaround exists or if the decorator needs to be adjusted to preserve the property descriptor for spy compatibility.