VS Code API
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    Variable onDidCloseTextDocumentConst

    onDidCloseTextDocument: Event<TextDocument>

    An event that is emitted when a text document is disposed or when the language id of a text document has been changed.

    Note 1: There is no guarantee that this event fires when an editor tab is closed, use the onDidChangeVisibleTextEditors-event to know when editors change.

    Note 2: A document can be open but not shown in an editor which means this event can fire for a document that has not been shown in an editor.