Can you explain the significance of this particular line in the source code of VSCode?

While browsing through the VS Code source code, I stumbled upon the following snippet: https://github.com/microsoft/vscode/blob/5da4d93f579f3fadbaf835d79dc47d54c0d6b6b4/src/vs/workbench/contrib/comments/browser/commentsEditorContribution.ts#L166

It appears that ICommentService is being used as an interface. However, I was under the impression that interfaces cannot be decorators. https://www.typescriptlang.org/docs/handbook/decorators.html#parameter-decorators

Could someone explain what @ICommentService signifies in this context?

typescriptvisual-studio-codeinterfacedecorator

Answer №1

ICommentService is actually a decorator function:

export const ICommentService = createDecorator<ICommentService>('commentService');

It also acts as an interface (similar to the one linked above):

export interface ICommentService {
  ...
}

This dual functionality is possible because in TypeScript, identifiers can be used to reference both a value (for runtime) and a type (for type-checking).

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