import { Buffer } from 'node:buffer';
import type { Size } from '../types';
export interface ImageInfo extends Size {
}
/**
 * Reads PNG/JPEG dimensions from the encoded header without decoding pixels.
 * This is intended for validating already-decoded dimension hints before an
 * image transform; full image validation remains the decoder's responsibility.
 */
export declare function encodedImageInfoOfBuffer(imageBuffer: Buffer): ImageInfo;
/**
 * Retrieves the dimensions of an image from a base64-encoded string
 *
 * @param imageBase64 - The base64-encoded image data
 * @returns A Promise that resolves to an object containing the width and height of the image
 * @throws Error if the image data is invalid
 */
export declare function imageInfoOfBase64(imageBase64: string): Promise<ImageInfo>;
/**
 * Check if the Buffer is a valid PNG image
 * @param buffer The Buffer to check
 * @returns true if the Buffer is a valid PNG image, otherwise false
 */
export declare function isValidPNGImageBuffer(buffer: Buffer): boolean;
/**
 * Check if the Buffer is a valid JPEG image
 * @param buffer The Buffer to check
 * @returns true if the Buffer is a valid JPEG image, otherwise false
 */
export declare function isValidJPEGImageBuffer(buffer: Buffer): boolean;
/**
 * Check if the Buffer is a valid image (PNG or JPEG)
 * @param buffer The Buffer to check
 * @returns true if the Buffer is a valid PNG or JPEG image, otherwise false
 */
export declare function isValidImageBuffer(buffer: Buffer): boolean;
export interface ValidateScreenshotBufferOptions {
    label: string;
    minBufferSize?: number;
}
export declare function validateScreenshotBuffer(screenshotBuffer: Buffer | undefined, { label, minBufferSize }: ValidateScreenshotBufferOptions): asserts screenshotBuffer is Buffer;
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