import { CSSProperties, DragEvent } from 'react';
import { Area } from 'react-easy-crop';
import { ImagePickerValue } from '../types/ImagePicker.types.ts';
/**
 * Checks whether a picker value is a locally selected file.
 *
 * @param value The current picker value to narrow.
 * @returns `true` when `value` is a `File`.
 */
export declare const isImagePickerFile: (value: ImagePickerValue) => value is File;
/**
 * Checks whether a drag event contains files rather than unrelated data.
 *
 * @param event The drag event emitted by the preview button.
 * @returns `true` when the event advertises files or contains at least one file.
 */
export declare const hasImagePickerFiles: (event: DragEvent) => boolean;
/**
 * Resolves a CSS aspect-ratio value to the numeric ratio required by the
 * cropper.
 *
 * @param aspectRatio The CSS ratio, such as `16 / 9`, or a numeric ratio.
 * @returns The positive numeric ratio, or `undefined` for non-fixed values.
 */
export declare const resolveImagePickerAspectRatio: (aspectRatio: CSSProperties["aspectRatio"]) => number | undefined;
/**
 * Tests a file against a native-style comma-separated `accept` value.
 *
 * MIME types, MIME wildcards such as `image/*`, and file extensions are
 * supported. An empty `accept` value accepts every file.
 *
 * @param file The file to validate.
 * @param accept The comma-separated accepted MIME types or extensions.
 * @returns `true` when the file matches at least one accepted value.
 */
export declare const acceptsImagePickerFile: (file: File, accept: string) => boolean;
/**
 * Mirrors a local file value into the native file input so form submission and
 * validation stay consistent with the picker preview.
 *
 * URL and empty values clear the input. Local files are assigned through
 * `DataTransfer` when the browser supports it; unsupported environments leave
 * the input cleared.
 *
 * @param input The native file input to synchronize, if mounted.
 * @param value The current picker value.
 */
export declare const syncImagePickerInput: (input: HTMLInputElement | null, value: ImagePickerValue) => void;
/**
 * Renders a crop area into a new local image file.
 *
 * The crop coordinates emitted by `react-easy-crop` are already expressed in
 * the source image's natural pixels, so no additional scale conversion is
 * needed before drawing to the canvas.
 *
 * @param file The original local image file.
 * @param cropAreaPixels The selected crop rectangle in source-image pixels.
 * @returns A new file with the original name and image MIME type.
 * @throws When the browser cannot load the image, create a canvas context, or
 *         encode the cropped canvas.
 */
export declare const createImagePickerCroppedFile: (file: File, cropAreaPixels: Area) => Promise<File>;