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説明

Bug Report

2023-07-31T08:27:10.000Z

# Bug Report ### 🔎 Search Terms - const enum ### 🕗 Version & Regression Information  - This is a runtime crash - This changed between versions 4.4.4 and 4.3.5 - This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________ - I was unable to test this on prior versions because _________ ### ⏯ Playground Link [Playground link with relevant code](https://www.typescriptlang.org/play?ts=5.1.6#code/MYewdgzgLgBApmArgWxgMRCGBvAUDAmAQxgF4YBGAGlwF9ddRIQAbOAOhZAHMAKDEAG0ARBWEBdAJRA) ### 💻 Code ```ts const enum Foo { a = 1, } console.log(Foo["1"]) ``` ### 🙁 Actual behavior ```JavaScript console.log(Foo["1"]); ``` ### 🙂 Expected behavior ```JavaScript console.log("a"); ``` or report error.

🔎 Search Terms

const enum

🕗 Version & Regression Information

This is a runtime crash
This changed between versions 4.4.4 and 4.3.5
This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________
I was unable to test this on prior versions because _________

⏯ Playground Link

Playground link with relevant code

💻 Code

const enum Foo {
    a = 1,
}

console.log(Foo["1"])

🙁 Actual behavior

console.log(Foo["1"]);

🙂 Expected behavior

console.log("a");

or report error.

コントリビューターガイド

調査方針: const enum が生成する JavaScript と逆マッピングの実装を調査し、Foo['1'] が ReferenceError を引き起こす理由を理解する。
技術スタック: typescript
領域: compilers
Issue 種別: バグ
難度: 2
推定時間: 1-3時間
活動状況: アクティブ
明確さ: 明確
前提条件: TypeScript
初心者向け度: 70