import { Constructable, FASTElement, PartialFASTElementDefinition } from '@microsoft/fast-element';
export type DefineFunction<TType> = (definition: PartialFASTElementDefinition) => TType;
export type DefinitionOverrider = (override: PartialFASTElementDefinition) => PartialFASTElementDefinition;
/**
 * Defines a platform custom element based on the provided type and definition.
 *
 * @example
 * An example using custom definition merge logic, useful if you need to impose hard restrictions.
 * ```ts
 * const definitionOverrider = (definition) => ({
 *    ...baseDefinition,
 *    ...definition,
 *    styles: baseDefinition.styles,
 *    shadowOptions: {
 *      mode: 'closed,
 *    },
 * });
 * export const define = defineFactory(LoginForm, definitionOverrider);
 * ```
 *
 * @example
 * You can provide the base definition if you're happy with the default spread operator merge logic.
 * ```ts
 * export const define = defineFactory(LoginForm, baseDefinition);
 * ```
 *
 * @param Type - The custom element Type / Class to define.
 * @param overriderOrBase - A function that merges definitions, or the base definition if custom merging is not needed.
 * @returns The type class.
 */
export declare const defineFactory: <TType extends Constructable<FASTElement>>(Type: TType, overriderOrBase: DefinitionOverrider | PartialFASTElementDefinition) => DefineFunction<TType>;
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