/**
 * Bitstream modes defined by `EXT_meshopt_compression` and `KHR_meshopt_compression`.
 *
 * `ATTRIBUTES` represents fixed-stride data such as vertex attributes and animation values,
 * `TRIANGLES` represents triangle-list indices, and `INDICES` represents arbitrary index
 * sequences.
 */
export type MeshoptCompressionMode = 'ATTRIBUTES' | 'TRIANGLES' | 'INDICES';
/**
 * Post-decode filters defined by the meshopt glTF extensions.
 *
 * `NONE`, `OCTAHEDRAL`, `QUATERNION`, and `EXPONENTIAL` are shared by EXT and KHR. `COLOR` is a KHR
 * addition for color data encoded in the YCoCg color model.
 */
export type MeshoptCompressionFilter = 'NONE' | 'OCTAHEDRAL' | 'QUATERNION' | 'EXPONENTIAL' | 'COLOR';
/**
 * Reports whether the current runtime can initialize the WebAssembly meshopt decoder.
 *
 * This check does not initialize the decoder; each asynchronous decode helper waits for
 * initialization through `MeshoptDecoder.ready`.
 *
 * @returns `true` when meshopt WebAssembly decoding is available.
 */
export declare function isMeshoptSupported(): boolean;
/**
 * Decodes a meshopt-compressed fixed-stride attribute buffer into caller-provided storage.
 *
 * @param target Destination byte array with capacity for at least `count * byteStride` bytes.
 * @param count Number of fixed-stride elements to decode.
 * @param byteStride Number of bytes in each decoded element.
 * @param source Complete compressed bitstream.
 * @param filter Post-decode filter name or legacy numeric identifier; defaults to `NONE`.
 * @returns A promise that resolves after decoded bytes have been written to `target`.
 * @throws If the compressed bitstream is malformed or incompatible with the supplied dimensions
 * or filter.
 */
export declare function meshoptDecodeVertexBuffer(target: Uint8Array, count: number, byteStride: number, source: Uint8Array, filter?: MeshoptCompressionFilter | number): Promise<void>;
/**
 * Decodes a meshopt-compressed triangle-list index buffer into caller-provided storage.
 *
 * @param target Destination byte array with capacity for at least `count * byteStride` bytes.
 * @param count Number of indices to decode.
 * @param byteStride Number of bytes per index; the glTF extensions permit `2` or `4`.
 * @param source Complete compressed triangle bitstream.
 * @returns A promise that resolves after decoded indices have been written to `target`.
 * @throws If the compressed bitstream is malformed or incompatible with the supplied dimensions.
 */
export declare function meshoptDecodeIndexBuffer(target: Uint8Array, count: number, byteStride: number, source: Uint8Array): Promise<void>;
/**
 * Decodes a meshopt-compressed arbitrary index sequence into caller-provided storage.
 *
 * @param target Destination byte array with capacity for at least `count * byteStride` bytes.
 * @param count Number of indices to decode.
 * @param byteStride Number of bytes per index; the glTF extensions permit `2` or `4`.
 * @param source Complete compressed index-sequence bitstream.
 * @returns A promise that resolves after decoded indices have been written to `target`.
 * @throws If the compressed bitstream is malformed or incompatible with the supplied dimensions.
 */
export declare function meshoptDecodeIndexSequence(target: Uint8Array, count: number, byteStride: number, source: Uint8Array): Promise<void>;
/**
 * Decodes a buffer described by `KHR_meshopt_compression` or `EXT_meshopt_compression`.
 *
 * The maintained meshoptimizer decoder supports EXT-compatible version 0 streams and the KHR
 * version 1 attribute stream. Dispatch is based on the declared glTF mode, and any filter is
 * applied after bitstream decompression without changing the output length.
 *
 * @param target Destination byte array with capacity for at least `count * byteStride` bytes.
 * @param count Number of elements to decode.
 * @param byteStride Number of bytes per element.
 * @param source Complete compressed bitstream selected by the extension byte range.
 * @param mode Compression mode declared by the extension.
 * @param filter Post-decode filter name or legacy numeric identifier; defaults to `NONE`.
 * @returns A promise that resolves after decoded bytes have been written to `target`.
 * @throws If the compressed bitstream is malformed or incompatible with the declared mode,
 * dimensions, or filter.
 */
export declare function meshoptDecodeGltfBuffer(target: Uint8Array, count: number, byteStride: number, source: Uint8Array, mode: MeshoptCompressionMode, filter?: MeshoptCompressionFilter | number): Promise<void>;
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