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    PluginHeaderActionBlueprint: ExtensionBlueprint<
        {
            config: {};
            configInput: {};
            dataRefs: never;
            inputs: {};
            kind: "plugin-header-action";
            output: ExtensionDataRef<Element, "core.reactElement", {}>;
            params: (
                params: { loader: () => Promise<Element> },
            ) => ExtensionBlueprintParams<{ loader: () => Promise<Element> }>;
        },
    > = ...

    Creates extensions that provide plugin-scoped header actions.

    These actions are automatically scoped to the plugin that provides them and will appear in the header of all pages belonging to that plugin.