export declare class ApiClient {
    private baseUrl;
    private projectId?;
    private syncToken?;
    constructor(config: {
        baseUrl: string;
        projectId?: string;
        syncToken?: string;
    });
    private getHeaders;
    private detectApiPattern;
    fetchProjectDataSingular(): Promise<{
        variables: any;
        components: any;
    }>;
    fetchProjectDataPlural(): Promise<{
        variables: any;
        components: any;
    }>;
    private fetchWithRetry;
    fetchLegacyVariables(): Promise<any>;
    fetchLegacyComponents(): Promise<any>;
    fetchAll(): Promise<{
        variables: any;
        components: any;
    }>;
    uploadBrandAsset(projectId: string, file: File, metadata?: any): Promise<any>;
}