import { ExtensionDataRef } from './createExtensionDataRef';
/** @public */
export interface ExtensionInput<UExtensionData extends ExtensionDataRef<unknown, string, {
    optional?: true;
}>, TConfig extends {
    singleton: boolean;
    optional: boolean;
}> {
    $$type: '@backstage/ExtensionInput';
    extensionData: Array<UExtensionData>;
    config: TConfig;
    replaces?: Array<{
        id: string;
        input: string;
    }>;
}
/** @public */
export declare function createExtensionInput<UExtensionData extends ExtensionDataRef<unknown, string, {
    optional?: true;
}>, TConfig extends {
    singleton?: boolean;
    optional?: boolean;
}>(extensionData: Array<UExtensionData>, config?: TConfig & {
    replaces?: Array<{
        id: string;
        input: string;
    }>;
}): ExtensionInput<UExtensionData, {
    singleton: TConfig['singleton'] extends true ? true : false;
    optional: TConfig['optional'] extends true ? true : false;
}>;