import { VineUnion } from './main.js';
import { UnionConditional } from './conditional.js';
import type { FieldContext, SchemaTypes } from '../../types.js';
/**
 * Create a new union schema type. A union is a collection of conditionals
 * and schema associated with it.
 *
 * Unions evaluate conditionals in order and apply the first matching schema.
 * Use `union.if()` to define conditional branches and `union.else()` for
 * the default fallback.
 *
 * @template Conditional - The union conditional type
 * @param conditionals - Array of conditional branches to evaluate
 *
 * @example
 * const schema = vine.union([
 *   vine.union.if(
 *     (value) => typeof value === 'string',
 *     vine.string()
 *   ),
 *   vine.union.if(
 *     (value) => typeof value === 'number',
 *     vine.number()
 *   )
 * ])
 */
export declare function union<Conditional extends UnionConditional<any>>(conditionals: Conditional[]): VineUnion<Conditional>;
export declare namespace union {
    var _a: <Schema extends SchemaTypes>(conditon: (value: Record<string, unknown>, field: FieldContext) => any, schema: Schema) => UnionConditional<Schema>;
    var _b: <Schema extends SchemaTypes>(schema: Schema) => UnionConditional<Schema>;
    export { _a as if, _b as else };
}