Microsoft/TypeScript

Sourcemap - names array empty for all files

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#9,627 opened on 2016年7月11日

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 (30 comments) (55 reactions) (0 assignees)TypeScript (48,455 stars) (6,726 forks)batch import
Experience EnhancementHelp WantedSuggestion

説明

TypeScript Version: 1.8.34.0 Module System: AMD ECMAScript Version: ECMAScript 5 VS 2015 Update 3

All of my map files have the names array empty. I would expect that to have been populated. This has been an issue with VS2015 with all updates

Code

class HomeIndex {

    someVar: number;

    constructor() {
        this.someVar = 0;
    }

    onLoad = () => { 
    };

    dispose() {
    };

}

export = HomeIndex;

Generated map

{
  "version": 3,
  "file": "Index.js",
  "sourceRoot": "",
  "sources": [ "Index.ts" ],
  "names": [],
  "mappings": ";;IAAA;QAII;YAIA,WAAM,GAAG;YACT,CAAC,CAAC;YAJE,IAAI,CAAC,OAAO,GAAG,CAAC,CAAC;QACrB,CAAC;QAKD,2BAAO,GAAP;QACA,CAAC;;QAEL,gBAAC;IAAD,CAAC,AAdD,IAcC;IAED,OAAS,SAAS,CAAC"
}

Expected behavior: names array should contain values for members and variables Actual behavior: names array empty

コントリビューターガイド

技術スタック
typescript
領域
toolingbackend
Issue 種別
bug
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
4
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
over 1 week
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
clear
前提条件
Understanding of TypeScript compiler internalsFamiliarity with source map specification
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
10
調査方針
Investigate the TypeScript compiler's source map generation logic, specifically how names are collected and written to the names array. Look at the emitter module (src/compiler/emitter.ts) and any source map related utilities. The issue has been open since 2016 with 30 comments, suggesting previous attempts may have been incomplete. Consider checking if the bug is related to the use of AMD module system or specific ECMAScript version. Testing with a minimal reproduction and examining the generated mappings could help identify where names are dropped.