From 311fc766167cc16640a94b5bea6bfe8b898b3297 Mon Sep 17 00:00:00 2001
From: Danila Poyarkov <dev@dannote.net>
Date: Wed, 4 Mar 2026 18:05:24 +0300
Subject: [PATCH] Apply derivedSymbolData sizes on import

Figma pre-computes child dimensions for each combination of
component property values and stores them in derivedSymbolData.
Apply these size overrides using the same guidPath resolution
as symbolOverrides so containers shrink correctly when boolean
properties hide children.
---
 packages/core/src/kiwi/instance-overrides.ts | 33 ++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/packages/core/src/kiwi/instance-overrides.ts b/packages/core/src/kiwi/instance-overrides.ts
index 536cb0db5..98f68b270 100644
--- a/packages/core/src/kiwi/instance-overrides.ts
+++ b/packages/core/src/kiwi/instance-overrides.ts
@@ -29,6 +29,12 @@ interface ComponentPropAssignment {
   value: { boolValue?: boolean; textValue?: string }
 }
 
+interface DerivedSymbolOverride {
+  guidPath?: { guids?: GUID[] }
+  size?: { x: number; y: number }
+  [key: string]: unknown
+}
+
 export interface InstanceNodeChange {
   type?: string
   guid?: GUID
@@ -37,6 +43,7 @@ export interface InstanceNodeChange {
   componentPropDefs?: ComponentPropDef[]
   componentPropRefs?: ComponentPropRef[]
   componentPropAssignments?: ComponentPropAssignment[]
+  derivedSymbolData?: DerivedSymbolOverride[]
 }
 
 /**
@@ -223,6 +230,31 @@ export function populateAndApplyOverrides(
     }
   }
 
+  // Apply derivedSymbolData — pre-computed sizes for the current set of
+  // component property values. Uses the same guidPath resolution as
+  // symbolOverrides.
+  function applyDerivedSymbolData() {
+    for (const [ncId, nc] of changeMap) {
+      if (nc.type !== 'INSTANCE') continue
+      const derived = nc.derivedSymbolData
+      if (!derived?.length) continue
+
+      const nodeId = guidToNodeId.get(ncId)
+      if (!nodeId) continue
+
+      for (const d of derived) {
+        const guids = d.guidPath?.guids
+        if (!guids?.length) continue
+        if (!d.size) continue
+
+        const targetId = resolveOverrideTarget(nodeId, guids)
+        if (!targetId) continue
+
+        graph.updateNode(targetId, { width: d.size.x, height: d.size.y })
+      }
+    }
+  }
+
   // Apply overrides from each INSTANCE's symbolData
   const overriddenNodes = new Set<string>()
 
@@ -276,6 +308,7 @@ export function populateAndApplyOverrides(
 
   applySymbolOverrides()
   applyComponentProperties()
+  applyDerivedSymbolData()
 
   if (overriddenNodes.size === 0) return