The issue regarding this problem was addressed on https://github.com/tc39/proposal-decorators/issues/69. Despite this discussion, TypeScript does not currently support it.
The following code demonstrates the lack of support:
export @deco()
class a {};
However, the code below does work as expected:
@deco
export class a {};
Referring to issue #31370:
The status of the Decorators Proposal is still evolving, and we are holding off on making any major changes to our implementation until the proposal advances to Stage 3. We will review this matter at that point.
It's worth noting that the Decorators Proposal is currently in stage 2.
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