import { LitElement, TemplateResult, CSSResult } from 'lit';
declare global {
    interface HTMLElementTagNameMap {
        'forge-ai-file-picker': AiFilePickerComponent;
    }
    interface HTMLElementEventMap {
        'forge-ai-file-picker-change': CustomEvent<ForgeAiFilePickerChangeEventData>;
        'forge-ai-file-picker-error': CustomEvent<ForgeAiFilePickerErrorEventData>;
    }
}
/**
 * Event data interface for the file picker change event.
 */
export interface ForgeAiFilePickerChangeEventData {
    /** The selected file */
    file: File;
    /** Timestamp when the file was selected */
    timestamp: number;
}
/**
 * Event data interface for the file picker error event.
 */
export interface ForgeAiFilePickerErrorEventData {
    /** The error type */
    type: 'size' | 'duplicate';
    /** The error message */
    message: string;
    /** The file that caused the error */
    filename: string;
}
export type AiFilePickerVariant = 'button' | 'icon-button';
/**
 * @summary An AI file picker component with button and icon-button variants.
 *
 * @description
 * A simple file picker component that allows users to select and upload files.
 * Provides both button and icon-button variants for different UI contexts.
 *
 * @slot - The default slot for button content when no file is selected.
 * @slot icon - The icon slot for icon-button variant.
 *
 * @event {CustomEvent<ForgeAiFilePickerChangeEventData>} forge-ai-file-picker-change - Fired when a file is selected via click or drag & drop.
 * The event detail contains the selected file and timestamp.
 */
export declare class AiFilePickerComponent extends LitElement {
    #private;
    static styles: CSSResult;
    /**
     * The variant of the file picker button.
     */
    variant: AiFilePickerVariant;
    /**
     * Whether the file picker is disabled.
     */
    disabled: boolean;
    /**
     * Accepted file types (comma-separated MIME types or extensions).
     */
    accept: string;
    /**
     * Whether to allow multiple file selection.
     */
    multiple: boolean;
    /**
     * Maximum file size in bytes. Default is 10MB.
     */
    maxSize: number;
    /**
     * Array of currently selected file names for duplicate checking.
     */
    selectedFiles: string[];
    private _isDragOver;
    private _fileInput;
    connectedCallback(): void;
    disconnectedCallback(): void;
    private _handleButtonClick;
    private _handleFileChange;
    private _onDragOver;
    private _onDragLeave;
    private _onDrop;
    render(): TemplateResult;
}