[fix] Add definite assignment assertions to fix TypeScript errors

- Add ! definite assignment assertions to properties that were using declare
- This fixes TypeScript compilation errors while maintaining Babel compatibility
- Properties are guaranteed to be assigned at runtime

src/lib/litegraph/src/subgraph/EmptySubgraphInput.ts

@@ -12,7 +12,7 @@ import type { SubgraphInputNode } from './SubgraphInputNode'
  * A virtual slot that simply creates a new input slot when connected to.
  */
 export class EmptySubgraphInput extends SubgraphInput {
-  parent: SubgraphInputNode
+  parent!: SubgraphInputNode
 
   constructor(parent: SubgraphInputNode) {
     super(

src/lib/litegraph/src/subgraph/EmptySubgraphOutput.ts

@@ -12,7 +12,7 @@ import type { SubgraphOutputNode } from './SubgraphOutputNode'
  * A virtual slot that simply creates a new output slot when connected to.
  */
 export class EmptySubgraphOutput extends SubgraphOutput {
-  parent: SubgraphOutputNode
+  parent!: SubgraphOutputNode
 
   constructor(parent: SubgraphOutputNode) {
     super(

src/lib/litegraph/src/subgraph/SubgraphInput.ts

@@ -30,7 +30,7 @@ import { isNodeSlot, isSubgraphOutput } from './subgraphUtils'
  * Functionally, however, when editing a subgraph, that "subgraph input" is the "origin" or "output side" of a link.
  */
 export class SubgraphInput extends SubgraphSlot {
-  parent: SubgraphInputNode
+  parent!: SubgraphInputNode
 
   events = new CustomEventTarget<SubgraphInputEventMap>()
 

src/lib/litegraph/src/subgraph/SubgraphNode.ts

@@ -35,7 +35,7 @@ import type { SubgraphInput } from './SubgraphInput'
  * An instance of a {@link Subgraph}, displayed as a node on the containing (parent) graph.
  */
 export class SubgraphNode extends LGraphNode implements BaseLGraph {
-  inputs: (INodeInputSlot & Partial<ISubgraphInput>)[]
+  inputs!: (INodeInputSlot & Partial<ISubgraphInput>)[]
 
   override readonly type: UUID
   override readonly isVirtualNode = true as const

src/lib/litegraph/src/subgraph/SubgraphOutput.ts

@@ -29,7 +29,7 @@ import { isNodeSlot, isSubgraphInput } from './subgraphUtils'
  * Functionally, however, when editing a subgraph, that "subgraph output" is the "target" or "input side" of a link.
  */
 export class SubgraphOutput extends SubgraphSlot {
-  parent: SubgraphOutputNode
+  parent!: SubgraphOutputNode
 
   override connect(
     slot: INodeOutputSlot,

src/lib/litegraph/src/widgets/BaseWidget.ts

@@ -63,10 +63,10 @@ export abstract class BaseWidget<TWidget extends IBaseWidget = IBaseWidget>
   }
 
   linkedWidgets?: IBaseWidget[]
-  name: string
-  options: TWidget['options']
+  name!: string
+  options!: TWidget['options']
   label?: string
-  type: TWidget['type']
+  type!: TWidget['type']
   y: number = 0
   last_y?: number
   width?: number