Microsoft/TypeScript

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

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#8,136 建立於 2016年4月17日

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 (3 留言) (0 反應) (0 負責人)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)

貢獻者指南

技術棧
typescript
領域
backendtooling
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。
5
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。
over 1 week
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。
clear
前置要求
TypeScript decoratorsTypeScript compiler APISymbol resolutionTSLint syntax walker
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。
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.