diff --git a/src/LGraph.ts b/src/LGraph.ts
index 06cfe6b50..d47f13a9f 100644
--- a/src/LGraph.ts
+++ b/src/LGraph.ts
@@ -48,6 +48,11 @@ export interface LGraphConfig {
   links_ontop?: any
 }
 
+export interface LGraphExtra extends Dictionary<unknown> {
+  reroutes?: SerialisableReroute[]
+  linkExtensions?: { id: number, parentId: number | undefined }[]
+}
+
 export interface BaseLGraph {
   readonly rootGraph: LGraph
 }
@@ -119,7 +124,7 @@ export class LGraph implements LinkNetwork, BaseLGraph, Serialisable<Serialisabl
   nodes_executing: boolean[] = []
   nodes_actioning: (string | boolean)[] = []
   nodes_executedAction: string[] = []
-  extra: Record<string, unknown> = {}
+  extra: LGraphExtra = {}
 
   /** @deprecated Deserialising a workflow sets this unused property. */
   version?: number
diff --git a/src/LGraphCanvas.ts b/src/LGraphCanvas.ts
index 8b0c61457..8c9f64750 100644
--- a/src/LGraphCanvas.ts
+++ b/src/LGraphCanvas.ts
@@ -6033,7 +6033,7 @@ export class LGraphCanvas {
           dialog.close()
         } else if (e.key == "Enter") {
           if (selected instanceof HTMLElement) {
-            select(unescape(String(selected.dataset.type)))
+            select(unescape(String(selected.dataset["type"])))
           } else if (first) {
             select(first)
           } else {
@@ -6395,7 +6395,7 @@ export class LGraphCanvas {
           help.className += ` ${className}`
         }
         help.addEventListener("click", function () {
-          select(unescape(String(this.dataset.type)))
+          select(unescape(String(this.dataset["type"])))
         })
         helper.append(help)
       }
diff --git a/src/LGraphGroup.ts b/src/LGraphGroup.ts
index 762dad00d..5b159e915 100644
--- a/src/LGraphGroup.ts
+++ b/src/LGraphGroup.ts
@@ -61,9 +61,9 @@ export class LGraphGroup implements Positionable, IPinnable, IColorable {
     // TODO: Object instantiation pattern requires too much boilerplate and null checking.  ID should be passed in via constructor.
     this.id = id ?? -1
     this.title = title || "Group"
-    this.color = LGraphCanvas.node_colors.pale_blue
-      ? LGraphCanvas.node_colors.pale_blue.groupcolor
-      : "#AAA"
+
+    const { pale_blue } = LGraphCanvas.node_colors
+    this.color = pale_blue ? pale_blue.groupcolor : "#AAA"
   }
 
   /** @inheritdoc {@link IColorable.setColorOption} */
diff --git a/src/canvas/MovingInputLink.ts b/src/canvas/MovingInputLink.ts
index f66721241..e26ce7d60 100644
--- a/src/canvas/MovingInputLink.ts
+++ b/src/canvas/MovingInputLink.ts
@@ -10,7 +10,7 @@ import { LinkDirection } from "@/types/globalEnums"
 import { MovingLinkBase } from "./MovingLinkBase"
 
 export class MovingInputLink extends MovingLinkBase {
-  readonly toType = "input"
+  override readonly toType = "input"
 
   readonly node: LGraphNode
   readonly fromSlot: INodeOutputSlot
diff --git a/src/canvas/MovingOutputLink.ts b/src/canvas/MovingOutputLink.ts
index 01d15858d..fa1b675a8 100644
--- a/src/canvas/MovingOutputLink.ts
+++ b/src/canvas/MovingOutputLink.ts
@@ -10,7 +10,7 @@ import { LinkDirection } from "@/types/globalEnums"
 import { MovingLinkBase } from "./MovingLinkBase"
 
 export class MovingOutputLink extends MovingLinkBase {
-  readonly toType = "output"
+  override readonly toType = "output"
 
   readonly node: LGraphNode
   readonly fromSlot: INodeInputSlot
diff --git a/src/canvas/ToOutputFromRerouteLink.ts b/src/canvas/ToOutputFromRerouteLink.ts
index ec37819f0..ba3a6570f 100644
--- a/src/canvas/ToOutputFromRerouteLink.ts
+++ b/src/canvas/ToOutputFromRerouteLink.ts
@@ -14,7 +14,7 @@ export class ToOutputFromRerouteLink extends ToOutputRenderLink {
     network: LinkNetwork,
     node: LGraphNode,
     fromSlot: INodeInputSlot,
-    readonly fromReroute: Reroute,
+    override readonly fromReroute: Reroute,
     readonly linkConnector: LinkConnector,
   ) {
     super(network, node, fromSlot, fromReroute)
diff --git a/src/subgraph/SubgraphSlotBase.ts b/src/subgraph/SubgraphSlotBase.ts
index 0890ff7ed..2a876b230 100644
--- a/src/subgraph/SubgraphSlotBase.ts
+++ b/src/subgraph/SubgraphSlotBase.ts
@@ -21,7 +21,7 @@ export abstract class SubgraphSlot extends SlotBase implements SubgraphIO, Seria
 
   readonly linkIds: LinkId[] = []
 
-  readonly boundingRect: Rect = [0, 0, 0, SubgraphSlot.defaultHeight]
+  override readonly boundingRect: Rect = [0, 0, 0, SubgraphSlot.defaultHeight]
 
   override get pos() {
     return this.#pos
diff --git a/src/types/serialisation.ts b/src/types/serialisation.ts
index 1bc9e8735..ee8363feb 100644
--- a/src/types/serialisation.ts
+++ b/src/types/serialisation.ts
@@ -8,7 +8,7 @@ import type {
   Point,
   Size,
 } from "../interfaces"
-import type { LGraphConfig, LGraphState } from "../LGraph"
+import type { LGraphConfig, LGraphExtra, LGraphState } from "../LGraph"
 import type { IGraphGroupFlags } from "../LGraphGroup"
 import type { NodeId, NodeProperty } from "../LGraphNode"
 import type { LiteGraph } from "../litegraph"
@@ -53,7 +53,7 @@ export interface SerialisableGraph extends BaseExportedGraph {
   links?: SerialisableLLink[]
   floatingLinks?: SerialisableLLink[]
   reroutes?: SerialisableReroute[]
-  extra?: Dictionary<unknown>
+  extra?: LGraphExtra
 }
 
 export type ISerialisableNodeInput = Omit<INodeInputSlot, "boundingRect" | "widget"> & {
@@ -114,9 +114,7 @@ export interface ISerialisedGraph extends BaseExportedGraph {
   floatingLinks?: SerialisableLLink[]
   groups: ISerialisedGroup[]
   version: typeof LiteGraph.VERSION
-  extra?: Dictionary<unknown> & {
-    reroutes?: SerialisableReroute[]
-  }
+  extra?: LGraphExtra
 }
 
 /**
diff --git a/src/widgets/KnobWidget.ts b/src/widgets/KnobWidget.ts
index 45502b999..ecd975142 100644
--- a/src/widgets/KnobWidget.ts
+++ b/src/widgets/KnobWidget.ts
@@ -36,7 +36,7 @@ export class KnobWidget extends BaseWidget implements IKnobWidget {
     }
   }
 
-  get height(): number {
+  override get height(): number {
     return this.computedHeight || super.height
   }
 
diff --git a/tsconfig.json b/tsconfig.json
index f9d5d9f9e..32b603a7d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -19,6 +19,8 @@
     "noUnusedParameters": false,
     "noFallthroughCasesInSwitch": true,
     "downlevelIteration": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
 
     /* AllowJs during migration phase */
     "allowJs": true,