x4js - v2.2.49
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    The document symbol provider interface defines the contract between extensions and the go to symbol-feature.

    interface DocumentSymbolProvider {
        displayName?: string;
        provideDocumentSymbols(
            model: ITextModel,
            token: CancellationToken,
        ): ProviderResult<DocumentSymbol[]>;
    }
    Index
    displayName?: string