Fix tsc and sketch error

src/clientSideScene/sceneEntities.ts

@@ -591,7 +591,7 @@ export class SceneEntities {
     const sg = kclManager.programMemory.get(
       variableDeclarationName
     ) as SketchGroup
-    const lastSeg = sg.value.slice(-1)[0] || sg.start
+    const lastSeg = sg?.value?.slice(-1)[0] || sg.start
 
     const index = sg.value.length // because we've added a new segment that's not in the memory yet, no need for `-1`
 

src/lib/machineManager.ts

@@ -27,7 +27,7 @@ export class MachineManager {
     // Start a background job to update the machines every ten seconds.
     // If MDNS is already watching, this timeout will wait until it's done to trigger the
     // finding again.
-    let timeoutId = undefined
+    let timeoutId: ReturnType<typeof setTimeout> | undefined = undefined
     const timeoutLoop = () => {
       clearTimeout(timeoutId)
       timeoutId = setTimeout(async () => {