import { FaviconReport, Fetcher } from './types';
export declare const filePathToReadableStream: (path: string) => Promise<ReadableStream>;
export declare const filePathToString: (path: string) => Promise<string>;
export declare const stringToReadableStream: (str: string) => ReadableStream;
export declare const readableStreamToString: (readableStream: ReadableStream) => Promise<string>;
export declare const readableStreamToBuffer: (readableStream: ReadableStream) => Promise<Buffer>;
export type CheckIconProcessor = {
    noHref: () => void;
    icon404: () => void;
    cannotGet: (httpStatusCode: number) => void;
    downloadable: () => void;
    square: (widthHeight: number) => void;
    notSquare: (width: number, Height: number) => void;
    rightSize: (widthHeight: number) => void;
    wrongSize: (widthHeight: number) => void;
};
export declare const pathToMimeType: (path: string) => string;
export type CheckIconOutput = {
    content: string | null;
    url: string | null;
    width: number | null;
    height: number | null;
};
export declare const checkIcon: (iconUrl: string | undefined, processor: CheckIconProcessor, fetcher: Fetcher, mimeType: string | undefined, expectedWidthHeight?: number) => Promise<CheckIconOutput | null>;
export declare const mergeUrlAndPath: (baseUrl: string, absoluteOrRelativePath: string) => string;
export declare const parseSizesAttribute: (sizes: string | undefined | null) => number | null;
export declare const bufferToDataUrl: (buffer: Buffer, mimeType: string) => string;
export declare const filePathToDataUrl: (filePath: string) => Promise<string>;
export declare const fetchFetcher: Fetcher;
export declare const reportHasErrors: (report: FaviconReport) => boolean;
export declare const reportHasWarnings: (report: FaviconReport) => boolean;