public static PipelineDefinition<TInput, TOutput> GraphLookup<TInput, TIntermediate, TFrom, TConnectFrom, TConnectTo, TStartWith, TAs, TOutput>(
	this PipelineDefinition<TInput, TIntermediate> pipeline,
	IMongoCollection<TFrom> from,
	FieldDefinition<TFrom, TConnectFrom> connectFromField,
	FieldDefinition<TFrom, TConnectTo> connectToField,
	AggregateExpressionDefinition<TIntermediate, TStartWith> startWith,
	FieldDefinition<TOutput, TAs> as,
	AggregateGraphLookupOptions<TFrom, TFrom, TOutput> options = null
)
where TAs : Object, IEnumerable<TFrom>

<ExtensionAttribute>
Public Shared Function GraphLookup(Of TInput, TIntermediate, TFrom, TConnectFrom, TConnectTo, TStartWith, TAs As {Object, IEnumerable(Of TFrom)}, TOutput) ( 
	pipeline As PipelineDefinition(Of TInput, TIntermediate),
	from As IMongoCollection(Of TFrom),
	connectFromField As FieldDefinition(Of TFrom, TConnectFrom),
	connectToField As FieldDefinition(Of TFrom, TConnectTo),
	startWith As AggregateExpressionDefinition(Of TIntermediate, TStartWith),
	as As FieldDefinition(Of TOutput, TAs),
	Optional options As AggregateGraphLookupOptions(Of TFrom, TFrom, TOutput) = Nothing
) As PipelineDefinition(Of TInput, TOutput)

[<ExtensionAttribute>]
static member GraphLookup : 
        pipeline : PipelineDefinition<'TInput, 'TIntermediate> * 
        from : IMongoCollection<'TFrom> * 
        connectFromField : FieldDefinition<'TFrom, 'TConnectFrom> * 
        connectToField : FieldDefinition<'TFrom, 'TConnectTo> * 
        startWith : AggregateExpressionDefinition<'TIntermediate, 'TStartWith> * 
        as : FieldDefinition<'TOutput, 'TAs> * 
        ?options : AggregateGraphLookupOptions<'TFrom, 'TFrom, 'TOutput> 
(* Defaults:
        let _options = defaultArg options null
*)
-> PipelineDefinition<'TInput, 'TOutput>  when 'TAs : Object and IEnumerable<'TFrom>