function first(): GLib.VariantType {
    // Gjs wrapper for g_variant_type_first()

Determines the first item type of a tuple or dictionary entry type.

This function may only be used with tuple or dictionary entry types, but must not be used with the generic tuple type %G_VARIANT_TYPE_TUPLE.

In the case of a dictionary entry type, this returns the type of the key.

null is returned in case of type being %G_VARIANT_TYPE_UNIT.

This call, together with provides an iterator interface over tuple and dictionary entry types.


the first item type of type, or null

Since 2.24