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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"enum member key should reject bigint","articleBody":"### 🔎 Search Terms\n\nenum, bigint, member key\n\n### 🕗 Version \u0026 Regression Information\n\nThis is the behavior in every version I tried.\n\n### ⏯ Playground Link\n\nhttps://www.typescriptlang.org/play/?#code/KYOwrgtgBAolDeAoKKoAYRQLzsQXyA\n\n### 💻 Code\n\n```ts\nenum E {\n    0n = 0\n}\n```\n\n\n### 🙁 Actual behavior\n\nTransformed to\n```js\n\"use strict\";\nvar E;\n(function (E) {\n    E[E[0n] = 0] = 0n;\n})(E || (E = {}));\n\n```\nwithout error\n\n### 🙂 Expected behavior\n\nIt should throw an error \"An enum member cannot have a numeric name.\", similar to how we handle `enum E { 0 = 0 }`. Disallowing numeric value `0` but allowing bigInt value `0n` as enum member key seems inconsistent.\n\n### Additional information about the issue\n\nFirst reported in https://github.com/babel/babel/issues/17331.","author":{"url":"https://github.com/JLHwung","@type":"Person","name":"JLHwung"},"datePublished":"2025-05-27T20:19:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/61772/TypeScript/issues/61772"}