Exported namespace class suppresses TS1308 for await in computed member names

[mohsen1]

🔎 Search Terms

await, namespace, computed property, computed member, TS1308, export class, top-level await

🕗 Version & Regression Information

This occurs in every version tested: 7.0.2 and 7.1.0-dev.20260802.1 (nightly). I reviewed the FAQ and searched open and closed issues.

💻 Code

declare const x: string;

namespace N {
  class A { [await x]() {} }        // TS1308
  export class B { [await x]() {} } // no error
}

export {};

🙁 Actual behavior

export suppresses TS1308. The emitted await is inside the namespace's synchronous IIFE, producing invalid JavaScript.

🙂 Expected behavior

Both computed names report TS1308.