diff --git a/src/lang/wasm.ts b/src/lang/wasm.ts
index 4ee6833ce..31e8d7135 100644
--- a/src/lang/wasm.ts
+++ b/src/lang/wasm.ts
@@ -35,7 +35,7 @@ import { Configuration } from 'wasm-lib/kcl/bindings/Configuration'
 import { DeepPartial } from 'lib/types'
 import { ProjectConfiguration } from 'wasm-lib/kcl/bindings/ProjectConfiguration'
 import { Sketch } from '../wasm-lib/kcl/bindings/Sketch'
-import { ExecState as RawExecState } from '../wasm-lib/kcl/bindings/ExecState'
+import { ExecOutcome as RustExecOutcome } from 'wasm-lib/kcl/bindings/ExecOutcome'
 import { ProgramMemory as RawProgramMemory } from '../wasm-lib/kcl/bindings/ProgramMemory'
 import { EnvironmentRef } from '../wasm-lib/kcl/bindings/EnvironmentRef'
 import { Environment } from '../wasm-lib/kcl/bindings/Environment'
@@ -260,10 +260,10 @@ export function emptyExecState(): ExecState {
   }
 }
 
-function execStateFromRaw(raw: RawExecState): ExecState {
+function execStateFromRust(execOutcome: RustExecOutcome): ExecState {
   return {
-    memory: ProgramMemory.fromRaw(raw.modLocal.memory),
-    operations: raw.modLocal.operations,
+    memory: ProgramMemory.fromRaw(execOutcome.memory),
+    operations: execOutcome.operations,
   }
 }
 
@@ -535,14 +535,14 @@ export const _executor = async (
         jsAppSettings = getAllCurrentSettings(lastSettingsSnapshot)
       }
     }
-    const execState: RawExecState = await execute(
+    const execOutcome: RustExecOutcome = await execute(
       JSON.stringify(node),
       JSON.stringify(programMemoryOverride?.toRaw() || null),
       JSON.stringify({ settings: jsAppSettings }),
       engineCommandManager,
       fileSystemManager
     )
-    return execStateFromRaw(execState)
+    return execStateFromRust(execOutcome)
   } catch (e: any) {
     console.log(e)
     const parsed: KclErrorWithOutputs = JSON.parse(e.toString())
diff --git a/src/wasm-lib/kcl/src/execution/cache.rs b/src/wasm-lib/kcl/src/execution/cache.rs
index ea8ed1b5c..479778aa0 100644
--- a/src/wasm-lib/kcl/src/execution/cache.rs
+++ b/src/wasm-lib/kcl/src/execution/cache.rs
@@ -1,6 +1,5 @@
 //! Functions for helping with caching an ast and finding the parts the changed.
 
-use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
 use crate::{
@@ -9,8 +8,7 @@ use crate::{
 };
 
 /// Information for the caching an AST and smartly re-executing it if we can.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 pub struct CacheInformation {
     /// The old information.
     pub old: Option<OldAstState>,
@@ -19,8 +17,7 @@ pub struct CacheInformation {
 }
 
 /// The old ast and program memory.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 pub struct OldAstState {
     /// The ast.
     pub ast: Node<Program>,
@@ -40,8 +37,7 @@ impl From<crate::Program> for CacheInformation {
 }
 
 /// The result of a cache check.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 pub struct CacheResult {
     /// Should we clear the scene and start over?
     pub clear_scene: bool,
diff --git a/src/wasm-lib/kcl/src/execution/mod.rs b/src/wasm-lib/kcl/src/execution/mod.rs
index 82378e4ed..32f3dffa0 100644
--- a/src/wasm-lib/kcl/src/execution/mod.rs
+++ b/src/wasm-lib/kcl/src/execution/mod.rs
@@ -51,16 +51,14 @@ use crate::{
 pub use cad_op::Operation;
 
 /// State for executing a program.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 #[serde(rename_all = "camelCase")]
 pub struct ExecState {
     pub global: GlobalState,
     pub mod_local: ModuleState,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
 #[serde(rename_all = "camelCase")]
 pub struct GlobalState {
     /// The stable artifact ID generator.
@@ -71,8 +69,7 @@ pub struct GlobalState {
     pub module_infos: IndexMap<ModuleId, ModuleInfo>,
 }
 
-#[derive(Debug, Default, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Default, Clone, Deserialize, Serialize, PartialEq)]
 #[serde(rename_all = "camelCase")]
 pub struct ModuleState {
     /// Program variable bindings.
@@ -94,6 +91,18 @@ pub struct ModuleState {
     pub settings: MetaSettings,
 }
 
+/// Outcome of executing a program.  This is used in TS.
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
+#[ts(export)]
+#[serde(rename_all = "camelCase")]
+pub struct ExecOutcome {
+    /// Program variable bindings of the top-level module.
+    pub memory: ProgramMemory,
+    /// Operations that have been performed in execution order, for display in
+    /// the Feature Tree.
+    pub operations: Vec<Operation>,
+}
+
 impl Default for ExecState {
     fn default() -> Self {
         Self::new()
@@ -123,6 +132,18 @@ impl ExecState {
         };
     }
 
+    /// Convert to execution outcome when running in WebAssembly.  We want to
+    /// reduce the amount of data that crosses the WASM boundary as much as
+    /// possible.
+    pub fn to_wasm_outcome(self) -> ExecOutcome {
+        // Fields are opt-in so that we don't accidentally leak private internal
+        // state when we add more to ExecState.
+        ExecOutcome {
+            memory: self.mod_local.memory,
+            operations: self.mod_local.operations,
+        }
+    }
+
     pub fn memory(&self) -> &ProgramMemory {
         &self.mod_local.memory
     }
@@ -424,7 +445,7 @@ impl Environment {
 /// Dynamic state that depends on the dynamic flow of the program, like the call
 /// stack.  If the language had exceptions, for example, you could store the
 /// stack of exception handlers here.
-#[derive(Debug, Default, Clone, PartialEq, Eq, Deserialize, Serialize, ts_rs::TS, JsonSchema)]
+#[derive(Debug, Default, Clone, PartialEq, Eq, Deserialize, Serialize)]
 pub struct DynamicState {
     pub solid_ids: Vec<SolidLazyIds>,
 }
@@ -462,8 +483,7 @@ impl DynamicState {
 }
 
 /// A generator for ArtifactIds that can be stable across executions.
-#[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq)]
 #[serde(rename_all = "camelCase")]
 pub struct IdGenerator {
     next_id: usize,
@@ -1073,7 +1093,7 @@ impl Solid {
 
 /// An solid ID and its fillet and chamfer IDs.  This is needed for lazy
 /// fillet evaluation.
-#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize, ts_rs::TS, JsonSchema)]
+#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
 pub struct SolidLazyIds {
     pub solid_id: uuid::Uuid,
     pub sketch_id: uuid::Uuid,
@@ -1153,8 +1173,7 @@ pub enum BodyType {
 
 /// Info about a module.  Right now, this is pretty minimal.  We hope to cache
 /// modules here in the future.
-#[derive(Debug, Clone, PartialEq, Deserialize, Serialize, ts_rs::TS, JsonSchema)]
-#[ts(export)]
+#[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 pub struct ModuleInfo {
     /// The ID of the module.
     id: ModuleId,
diff --git a/src/wasm-lib/src/wasm.rs b/src/wasm-lib/src/wasm.rs
index fc84e66da..efecd97cb 100644
--- a/src/wasm-lib/src/wasm.rs
+++ b/src/wasm-lib/src/wasm.rs
@@ -133,7 +133,7 @@ pub async fn execute(
     // gloo-serialize crate instead.
     // DO NOT USE serde_wasm_bindgen::to_value(&exec_state).map_err(|e| e.to_string())
     // it will break the frontend.
-    JsValue::from_serde(&exec_state).map_err(|e| e.to_string())
+    JsValue::from_serde(&exec_state.to_wasm_outcome()).map_err(|e| e.to_string())
 }
 
 // wasm_bindgen wrapper for execute