@nestjs/graphql/dist/type-factories/create-union-type.factory.d.ts

/**
 * The API surface of this module has been heavily inspired by the "type-graphql" library (https://github.com/MichalLytek/type-graphql), originally designed & released by Michal Lytek.
 * In the v6 major release of NestJS, we introduced the code-first approach as a compatibility layer between this package and the `@nestjs/graphql` module.
 * Eventually, our team decided to reimplement all the features from scratch due to a lack of flexibility.
 * To avoid numerous breaking changes, the public API is backward-compatible and may resemble "type-graphql".
 */
import { Type } from '@nestjs/common';
import { ResolveTypeFn } from '../interfaces/resolve-type-fn.interface';
/**
 * Interface defining options that can be passed to `createUnionType` function.
 */
export interface UnionOptions<T extends readonly Type<unknown>[] = Type<unknown>[]> {
    /**
     * Name of the union.
     */
    name?: string;
    /**
     * Description of the union.
     */
    description?: string;
    /**
     * Custom implementation of the "resolveType" function.
     */
    resolveType?: ResolveTypeFn<any, any>;
    /**
     * Types that the union consist of.
     */
    types: () => T;
}
export type ArrayElement<ArrayType extends readonly unknown[]> = ArrayType[number];
export type Union<T extends readonly any[]> = InstanceType<ArrayElement<T>>;
/**
 * Creates a GraphQL union type composed of types references.
 * @param options
 */
export declare function createUnionType<T extends readonly Type<unknown>[] = Type<unknown>[]>(options: UnionOptions<T>): Union<T>;
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