/** @public */
export type ExtensionDataRef<TData, TConfig extends {
    optional?: true;
} = {}> = {
    id: string;
    T: TData;
    config: TConfig;
    $$type: '@backstage/ExtensionDataRef';
};
/** @public */
export interface ConfigurableExtensionDataRef<TData, TConfig extends {
    optional?: true;
} = {}> extends ExtensionDataRef<TData, TConfig> {
    optional(): ConfigurableExtensionDataRef<TData, TData & {
        optional: true;
    }>;
}
/** @public */
export declare function createExtensionDataRef<TData>(id: string): ConfigurableExtensionDataRef<TData>;