Microsoft/TypeScript

Cannot get symbol inside class decorator (Cannot read property 'members' of un...)

Open

#8,136 创建于 2016年4月17日

在 GitHub 查看
 (3 评论) (0 反应) (0 负责人)TypeScript (48,455 star) (6,726 fork)batch import
BugDomain: APIDomain: DecoratorsHelp Wanted

描述

TypeScript Version:

1.8.10

Code

@Component({
  selector: SELECTOR
})
class SampleComponent {}
const SELECTOR = 'ng-demo';

Expected behavior:

With sample SyntaxWalker based on tslint, once I visit the PropertyAssignment - selector: SELECTOR and invoke typeChecker.getSymbolAtLocation(prop.initializer); I should get the SELECTOR symbol.

Actual behavior:

     TypeError: Cannot read property 'members' of undefined
      at resolveName (node_modules/typescript/lib/typescript.js:15307:73)
      at resolveEntityName (node_modules/typescript/lib/typescript.js:15725:26)
      at getSymbolOfEntityNameOrPropertyAccessExpression (node_modules/typescript/lib/typescript.js:28708:28)
      at Object.getSymbolAtLocation (node_modules/typescript/lib/typescript.js:28770:28)

贡献者指南

技术栈
typescript
领域
backendtooling
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
5
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
over 1 week
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
TypeScript decoratorsTypeScript compiler APISymbol resolutionTSLint syntax walker
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
15
研究方向
Investigate the symbol resolution in the TypeScript compiler when called within a decorator. Look at the function `resolveName` in `typescript.js` (line 15307) and trace how it handles property assignments in decorators. Check if the issue is related to decorators not being fully processed when symbol resolution occurs. Review the implementation of `getSymbolAtLocation` and understand why the 'members' property is undefined. Consider whether the issue persists in the latest TypeScript version.