import type { AnyLayer, InferIn, InferOut, Layer } from "./index.js";
/**
 * Combines one or more layers into a composite layer.
 *
 * Layers defined as a tuple are applied from the inside out. This means that
 * the last layer becomes the innermost layer, while the first layer becomes the
 * outermost layer.
 */
export declare const layerTuple: <Layers extends readonly [AnyLayer, ...AnyLayer[]]>(...layers: LayerChain<Layers>) => LayerTuple<Layers>;
/**
 * A combination of multiple layers.
 *
 * @see {@link layerTuple}
 */
export declare class LayerTuple<Layers extends readonly [AnyLayer, ...AnyLayer[]], Out extends InferOut<FirstLayer<Layers>> = InferOut<FirstLayer<Layers>>, In extends InferIn<LastLayer<Layers>> = InferIn<LastLayer<Layers>>> implements Layer<Out, In> {
    private readonly layers;
    constructor(layers: LayerChain<Layers>);
    layer(inner: In): Out;
}
export type FirstLayer<T extends readonly unknown[]> = T[0];
export type LastLayer<T extends readonly unknown[]> = T extends readonly [...unknown[], infer U] ? U : FirstLayer<T>;
export type LayerChain<Layers extends readonly [AnyLayer, ...AnyLayer[]]> = Layers & ValidateLayerChain<Layers>;
export type ValidateLayerChain<Layers extends readonly [AnyLayer, ...AnyLayer[]]> = Layers extends [
    infer L1 extends AnyLayer,
    infer L2 extends AnyLayer,
    ...infer Rest extends AnyLayer[]
] ? [Layer<InferOut<L1>, InferOut<L2>>, ...ValidateLayerChain<[L2, ...Rest]>] : Layers extends [infer Last extends AnyLayer] ? [Layer<InferOut<Last>, InferIn<Last>>] : never;