ArraysPrependT(ReadOnlySpanT, T) Method

Public Shared Function Prepend(Of T) ( 
	a As ReadOnlySpan(Of T),
	b As T
) As T()

public:
generic<typename T>
static array<T>^ Prepend(
	ReadOnlySpan<T> a, 
	T b
)

JavaScript does not support generic types or methods.