import type { HttpContext } from '@adonisjs/http-server';
import { type prepareMultipartConfig } from '../parsers/multipart.ts';
import type { FileValidationOptions, PartHandler as PartHandlerType } from '../types.ts';
/**
 * Multipart class offers a low level API to interact with the incoming
 * HTTP request data as a stream. This makes it super easy to
 * write files to S3 without saving them to the disk first.
 */
export declare class Multipart {
    #private;
    /**
     * The current state of the multipart form handler
     */
    state: 'idle' | 'processing' | 'error' | 'success';
    /**
     * Creates a new Multipart instance for processing multipart form data
     *
     * @param ctx - The HTTP context
     * @param config - Configuration options for multipart processing
     * @param _featureFlags - Feature flags (unused)
     */
    constructor(ctx: HttpContext, config?: ReturnType<typeof prepareMultipartConfig>, _featureFlags?: Record<string, never>);
    /**
     * Attach handler for a given file. To handle all files, you
     * can attach a wildcard handler.
     *
     * @param name - The field name to handle, or '*' for wildcard
     * @param options - Validation options and configuration
     * @param handler - The handler function to process the file
     *
     * @example
     * ```ts
     * multipart.onFile('package', {}, async (stream) => {
     * })
     *
     * multipart.onFile('*', {}, async (stream) => {
     * })
     * ```
     */
    onFile(name: string, options: Partial<FileValidationOptions & {
        deferValidations: boolean;
    }>, handler: PartHandlerType): this;
    /**
     * Aborts the multipart stream processing by emitting an error event.
     * This will stop all file processing and reject the process promise.
     *
     * @param error - The error that caused the abort
     *
     * @example
     * ```ts
     * multipart.onFile('*', {}, async (part) => {
     *   if (part.file.size > MAX_SIZE) {
     *     multipart.abort(new Error('File too large'))
     *   }
     * })
     * ```
     */
    abort(error: any): void;
    /**
     * Processes the multipart request by parsing all file and field streams.
     * Must be called after registering all file handlers with onFile.
     *
     * @param config - Optional configuration overrides for this specific request
     *
     * @example
     * ```ts
     * const multipart = ctx.request.multipart
     *
     * multipart.onFile('avatar', {}, async (part, reportChunk) => {
     *   await streamFile(part, '/tmp/avatar.jpg', reportChunk)
     * })
     *
     * await multipart.process()
     * ```
     */
    process(config?: Partial<{
        limit: string | number;
        maxFields: number;
    }>): Promise<void>;
}