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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"TS1166 reported for imported symbol as computed property name in generated d.ts","articleBody":"### 🔎 Search Terms\n\nts1166\n\n\n\n\n### 🕗 Version \u0026 Regression Information\n\n- This changed between versions 5.7.2 and 5.8.2\n- This changed in commit or PR 61136\n- This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________\n- I was unable to test this on prior versions because _______\n\n\n### ⏯ Playground Link\n\nhttps://www.typescriptlang.org/play/?ts=5.7.3#code/JYWwDg9gTgLgBAbzsAdgZzAUwMbwL5wBmUEIcARChACaYBcArjMADbkDcAUJ9hOvNgZoYpOAF5k6LLgB0g4aS6dMAD0iw42FgEM0aOAFkAngFEoJKHFUxMKavrMXEnOHADa8kSAC6ACgCUdHDCUKgA5s6urlCYMAxQKBQUXK54nGmcQA\n\n### 💻 Code\n\ncompiling this code with 5.8.2 \n\n```ts\nimport { inspect } from \"node:util\";\nconst custom = inspect.custom;\nexport class MyError extends Error {\n  [custom](): string {\n    return \" \";\n  }\n}\n```\n\n\n\n### 🙁 Actual behavior\n\ngenerates the d.ts of\n```ts\ndeclare const custom: symbol;                                                                                                                                                                                              A computed property name in a class property declaration must have a simple literal type or a\nexport declare class MyError extends Error {                                                                                                                                                                                                                                                'unique symbol' type. [1166]\n    [custom]: () =\u003e string;\n}\nexport {};\n//# sourceMappingURL=restError.d.ts.map\n```\n\nOpening this in editor we are seeing error of\n\u003e restError… 3   5 error    1166   A computed property name in a class property declaration must have a simple literal type or a 'unique symbol' type. (lsp)\n\n\n### 🙂 Expected behavior\n\n\nd.ts generated by 5.7.2 is slightly different `[x: symbol]: () =\u003e string;` and has no errors\n\n```ts\nexport declare class MyError extends Error {\n    [x: symbol]: () =\u003e string;\n}\n//# sourceMappingURL=restError.d.ts.map\n```\n\n\n### Additional information about the issue\n\n\n\n`every-ts bisect` pointing to this commit: \n\n\u003ec3ae7c418f6163cb7d051c7e153d77c4c4c73769 is the first bad commit\ncommit c3ae7c418f6163cb7d051c7e153d77c4c4c73769 (HEAD)\nAuthor: Gabriela Araujo Britto \u003cgabrielaa@microsoft.com\u003e\nDate:   Fri Feb 7 10:55:34 2025 -0800\n\u003e\n\u003e    Revert return type narrowing (#61136)\n\nSame issue exists in version 5.9.0-dev.20250305\n","author":{"url":"https://github.com/jeremymeng","@type":"Person","name":"jeremymeng"},"datePublished":"2025-03-05T22:44:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/61360/TypeScript/issues/61360"}