rete-kit/assets/app/common/customization/custom-background.ts

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import type { BaseSchemes } from "rete";
import type { AreaPlugin } from "rete-area-plugin";

export function addCustomBackground<S extends BaseSchemes, K>(
  area: AreaPlugin<S, K>
) {
  const background = document.createElement("div");

  background.classList.add("background");
  background.classList.add("fill-area");

  area.area.content.add(background);
}