Interface CallHierarchyProvider

interface CallHierarchyProvider {
    incomingCalls(
        params: CallHierarchyIncomingCallsParams,
        cancelToken?: Cancellation.CancellationToken,
    ): MaybePromise<undefined | CallHierarchyIncomingCall[]>;
    outgoingCalls(
        params: CallHierarchyOutgoingCallsParams,
        cancelToken?: Cancellation.CancellationToken,
    ): MaybePromise<undefined | CallHierarchyOutgoingCall[]>;
    prepareCallHierarchy(
        document: LangiumDocument,
        params: CallHierarchyPrepareParams,
        cancelToken?: Cancellation.CancellationToken,
    ): MaybePromise<undefined | CallHierarchyItem[]>;
}