import { Extension, PropertyType, ReaderContext, WriterContext } from '@gltf-transform/core';
import { Unlit } from './unlit.js';
/**
 * [`KHR_materials_unlit`](https://github.com/KhronosGroup/gltf/blob/main/extensions/2.0/Khronos/KHR_materials_unlit/)
 * defines an unlit shading model for use in glTF 2.0 materials.
 *
 * ![Illustration](/media/extensions/khr-materials-unlit.png)
 *
 * > _**Figure:** Unlit materials are useful for flat shading, stylized effects, and for improving
 * > performance on mobile devices. Source: [Model by Hayden VanEarden](https://sketchfab.com/3d-models/summertime-kirby-c5711316103a4d67a62c34cfe8710938)._
 *
 * Unlit (also "Shadeless" or "Constant") materials provide a simple alternative to the Physically
 * Based Rendering (PBR) shading models provided by the core specification. Unlit materials are
 * often useful for cheaper rendering on performance-contrained devices, e.g. mobile phones.
 * Additionally, unlit materials can be very useful in achieving stylized, non-photo-realistic
 * effects like hand painted illustrative styles or baked toon shaders.
 *
 * Properties:
 * - {@link Unlit}
 *
 * ### Example
 *
 * The `KHRMaterialsUnlit` class provides a single {@link ExtensionProperty} type, `Unlit`, which may
 * be attached to any {@link Material} instance. For example:
 *
 * ```typescript
 * import { KHRMaterialsUnlit, Unlit } from '@gltf-transform/extensions';
 *
 * // Create an Extension attached to the Document.
 * const unlitExtension = document.createExtension(KHRMaterialsUnlit);
 *
 * // Create an Unlit property.
 * const unlit = unlitExtension.createUnlit();
 *
 * // Attach the property to a Material.
 * material.setExtension('KHR_materials_unlit', unlit);
 * ```
 */
export declare class KHRMaterialsUnlit extends Extension {
    static readonly EXTENSION_NAME = "KHR_materials_unlit";
    readonly extensionName = "KHR_materials_unlit";
    readonly prereadTypes: PropertyType[];
    readonly prewriteTypes: PropertyType[];
    /** Creates a new Unlit property for use on a {@link Material}. */
    createUnlit(): Unlit;
    /** @hidden */
    read(_context: ReaderContext): this;
    /** @hidden */
    write(_context: WriterContext): this;
    /** @hidden */
    preread(context: ReaderContext): this;
    /** @hidden */
    prewrite(context: WriterContext): this;
}