export declare const enum ColorType {
    Grayscale = 0,
    RGB = 2,
    Palette = 3,
    GrayscaleAlpha = 4,
    RGBA = 6
}
export declare const enum InterlaceType {
    None = 0,
    Adam7 = 1
}
export declare const enum PNGUnit {
    Unknown = 0,
    Meter = 1
}
export declare class Chunk {
    readonly type: string;
    constructor(type: string);
    chunkComputeLength(header: ChunkHeader): number;
    chunkSave(header: ChunkHeader, view: DataView, offset: number): void;
    chunkClone(): Chunk;
    static parse(length: number, type: string, crc: number, view: DataView, offset: number, header: ChunkHeader): Chunk;
}
export declare class ChunkUnknown extends Chunk {
    buffer: ArrayBuffer;
    constructor(type: string, buffer: ArrayBuffer);
    chunkClone(): ChunkUnknown;
    chunkComputeLength(header: ChunkHeader): number;
    chunkSave(header: ChunkHeader, view: DataView, offset: number): void;
    static parse(length: number, type: string, crc: number, view: DataView, offset: number, header: ChunkHeader): ChunkUnknown;
}
export declare class ChunkHeader extends Chunk {
    width: number;
    height: number;
    bitDepth: number;
    colorType: ColorType;
    compression: number;
    filter: number;
    interlace: InterlaceType;
    static parse(length: number, type: string, crc: number, view: DataView, offset: number, header: ChunkHeader): ChunkHeader;
    constructor(width: number, height: number, bitDepth?: number, colorType?: ColorType, compression?: number, filter?: number, interlace?: InterlaceType);
    chunkClone(): ChunkHeader;
    chunkComputeLength(header: ChunkHeader): number;
    chunkSave(header: ChunkHeader, view: DataView, offset: number): void;
}
export declare class ChunkEnd extends Chunk {
    constructor();
    chunkComputeLength(header: ChunkHeader): number;
    chunkSave(header: ChunkHeader, view: DataView, offset: number): void;
    chunkClone(): ChunkEnd;
    static parse(length: number, type: string, crc: number, view: DataView, offset: number, header: ChunkHeader): Chunk;
}
export declare class ChunkPixelData extends Chunk {
    data: ArrayBuffer;
    constructor(data: ArrayBuffer);
    static parse(length: number, type: string, crc: number, view: DataView, offset: number, header: ChunkHeader): ChunkPixelData;
    chunkComputeLength(header: ChunkHeader): number;
    chunkSave(header: ChunkHeader, view: DataView, offset: number): void;
    chunkClone(): ChunkEnd;
}