is_layout(ggheatmap(1:10))
# for quad_layout()
is_quad_layout(quad_alignb(1:10))
is_quad_layout(quad_alignh(1:10))
is_quad_layout(quad_alignv(1:10))
is_quad_layout(quad_free(mtcars))
# for stack_layout()
is_stack_layout(stack_discrete("h", 1:10))
is_stack_layout(stack_continuous("h", 1:10))
# for heatmap_layout()
is_heatmap_layout(ggheatmap(1:10))
is_ggheatmap(ggheatmap(1:10))
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