import { Texture } from '@gltf-transform/core';
import { TextureChannel } from '@gltf-transform/core';
/**
 * Returns a list of {@link TextureChannel TextureChannels} used by the given
 * texture. Determination is based only on the _role_ of the textures, e.g.
 * a texture used for the `occlusionTexture` will have (at least) a red channel
 * in use. See {@link getTextureChannelMask} for bitmask alternative.
 *
 * Example:
 *
 * ```js
 * const channels = listTextureChannels(texture);
 * if (channels.includes(TextureChannel.R)) {
 *   console.log('texture red channel used');
 * }
 * ```
 */
export declare function listTextureChannels(texture: Texture): TextureChannel[];
/**
 * Returns bitmask of all {@link TextureChannel TextureChannels} used by the
 * given texture. Determination is based only on the _role_ of the textures, e.g.
 * a texture used for the `occlusionTexture` will have (at least) a red channel.
 * See {@link listTextureChannels} for an array alternative.
 *
 * Example:
 *
 * ```js
 * const mask = getTextureChannelMask(texture);
 * if (mask & TextureChannel.R) {
 *   console.log('texture red channel used');
 * }
 * ```
 */
export declare function getTextureChannelMask(texture: Texture): number;