Dedupe custom codes emitted by rx.memo components

reflex/.templates/jinja/web/pages/custom_component.js.jinja2

@@ -1,11 +1,14 @@
 {% extends "web/pages/base_page.js.jinja2" %}
 {% from "web/pages/macros.js.jinja2" import renderHooks %}
-{% block export %}
-{% for component in components %}
 
-{% for custom_code in component.custom_code %}
+{% block declaration %}
+{% for custom_code in custom_codes %}
 {{custom_code}}
 {% endfor %}
+{% endblock %}
+
+{% block export %}
+{% for component in components %}
 
 export const {{component.name}} = memo(({ {{-component.props|join(", ")-}} }) => {
     {{ renderHooks(component.hooks) }}

reflex/compiler/compiler.py

@@ -246,12 +246,20 @@ def _compile_components(
         for comp_import in comp_render["dynamic_imports"]
     }
 
+    custom_codes = {
+        comp_import: None
+        for comp_render in component_renders
+        if "custom_code" in comp_render
+        for comp_import in comp_render["custom_code"]
+    }
+
     # Compile the components page.
     return (
         templates.COMPONENTS.render(
             imports=utils.compile_imports(imports),
             components=component_renders,
             dynamic_imports=dynamic_imports,
+            custom_codes=custom_codes,
         ),
         imports,
     )