Method beforeChange

src/LGraph.ts:1162–1165

(info?: LGraphNode)

  // used for undo, called before any change is made to the graph
  beforeChange(info?: LGraphNode): void {
    this.onBeforeChange?.(this, info)
    this.canvasAction(c => c.onBeforeChange?.(this))
  }

  // used to resend actions, called after any change is made to the graph
  afterChange(info?: LGraphNode | null): void {