From bac3368fe58527a777e4e65d4f67cb326e9d176c Mon Sep 17 00:00:00 2001
From: hhaensel <helmut.haensel@gmx.de>
Date: Wed, 29 Nov 2023 22:58:07 +0100
Subject: [PATCH] exclude empty mixins from being included

---
 src/Stipple.jl           | 3 ++-
 src/stipple/rendering.jl | 7 ++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/Stipple.jl b/src/Stipple.jl
index f6f9a138..ab402144 100644
--- a/src/Stipple.jl
+++ b/src/Stipple.jl
@@ -766,7 +766,8 @@ function injectdeps(output::Vector{AbstractString}, M::Type{<:ReactiveModel}) ::
     mixinfields = fieldnames(Stipple.get_concrete_type(mixin))
     # if all fields are already part of the model, don't include data
     mode = isempty(setdiff(mixinfields, modelfields)) ? :mixindeps : :mixin
-    push!(output, mixin_dep(mixin; mode)())
+    out = mixin_dep(mixin; mode)()
+    out === nothing || push!(output, out)
   end
   output
 end
diff --git a/src/stipple/rendering.jl b/src/stipple/rendering.jl
index a930e4ac..5fb8b10b 100644
--- a/src/stipple/rendering.jl
+++ b/src/stipple/rendering.jl
@@ -169,7 +169,12 @@ function get_mixins(app::ReactiveModel)::Vector{ReactiveModel}
 end
 
 function mixin_dep(Mixin::Type{<:ReactiveModel}; mode::Symbol = :mixindeps)
-  mixin_dep() = script("const $(nameof(Mixin)) = $(strip(json(render(Mixin(); mode)), '"'))\n")
+  mix = strip(json(render(Mixin(); mode)), '"')
+  mixin_dep() = if mix == "{}"
+    nothing
+  else
+    script("const $(nameof(Mixin)) = $mix\n")
+  end
 end