This is used internally by the @design-sdk/figma family of packages.
pnpm add @design-sdk/figma-coreimport type { FigmaFileKey } from "@design-sdk/figma-core";
import { figma_special_filekeys } from "@design-sdk/figma-core";
const figmafilekey: FigmaFileKey =
figma_special_filekeys.anonymous_figma_plugin_file_key;import { mixed } from "@design-sdk/figma-core";
// define type
interface SomeFigmaNode {
propertyA: number | typeof mixed;
}