/// <reference types="node" />
import sharp from "sharp";
import { PluginPreviewImageHashCreateInput } from "../generated-admin-types";
import { PreviewImageHashBase, PreviewImageHashStrategy } from "./PreviewImageHashStrategy";
type ConstructorArgs = {
    /**
     * Will be passed into Sharp for resizing the asset before hashing. This means all
     * the default values of Sharp apply, except for `width` and `background`.
     *
     * Set only `width` OR `height` if you want to scale the second axis automatically.
     * If you set neither, `width` will become the default `64` to ensure you're not hashing the full size asset.
     *
     * Sharps `background` by default is black, but we overwrite it with white.
     *
     * @default width: 64 // Only if both `width` and `height` are undefined!
     * @default background: { r: 255, g: 255, b: 255, alpha: 1 }
     */
    resizeOptions?: sharp.ResizeOptions;
    /**
     * Used when serializing the hash into a string. Your frontend needs to know this to be able to parse it correctly.
     *
     * @default "base64"
     *
     * @example
     * ```javascript
     * // Encoding
     * Buffer.from(hash).toString("base64")
     * ```
     *
     * @example
     * ```javascript
     * // Decoding
     * Buffer.from(string, "base64")
     * ```
     */
    encoding?: BufferEncoding;
};
/**
 * A very compact representation of a placeholder for an image.
 * Store it inline with your data and show it while the real image is loading for a smoother loading experience.
 *
 * It's similar to BlurHash but with the following advantages:
 * - Encodes more detail in the same space
 * - Also encodes the aspect ratio
 * - Gives more accurate colors
 * - Supports images with alpha
 *
 * @category Strategy
 */
export declare class ThumbHashStrategy extends PreviewImageHashBase implements PreviewImageHashStrategy {
    constructor(args?: ConstructorArgs);
    encode(buffer: sharp.Sharp, input: PluginPreviewImageHashCreateInput): Promise<string>;
}
export {};