import type { IsNever } from '../never/never_type.js';
import type { IsUnion } from '../union/union.js';
import type { MergeOptions } from '../utils/options.js';
/**
 * 🦴 *utilities*
 * 🔢 *customizable*
 *
 * Filter the element `T` in an array or tuple to match `Criteria`.
 *
 * @typeParam Options['widen'] Allow using narrow type to match widen type.
 * e.g. `number, 1` -> `1 | undefined`.
 * Default to `true`.
 *
 * @typeParam Options['caseNotMatch'] Return value when `T` does not match `Criteria`.
 * Default to `never`.
 *
 * @typeParam Options['caseWiden'] Return value when `widen` is true.
 * Default to `Criteria | undefined`.
 *
 * @typeParam Options['caseUnionNotMatch'] Return value when a branch of the union `T` does not match `Criteria`.
 * Default to `never`.
 *
 * If you want the type to behave more like JavaScript,
 * you can override it to return `undefined`.
 *
 * Since it is a union, the result will be joined to the matched branch as union.
 * e.g. `ElementMatch<1 | 2, 1>` -> `1 | undefined`
 */
export type ElementMatch<T, Criteria, Options extends ElementMatch.Options = ElementMatch.DefaultOptions<Criteria>> = [T] extends [Criteria] ? T : (MergeOptions<Options, ElementMatch.DefaultOptions<Criteria>> extends infer C extends Record<keyof ElementMatch.Options, unknown> ? ((T extends Criteria ? T : (C['widen'] extends true ? (Criteria extends T ? C['caseWiden'] : C['caseNotMatch']) : C['caseNotMatch'])) extends infer R ? IsUnion<T, IsNever<R, R, R | C['caseUnionNotMatch']>, R> : C['caseNotMatch']) : never);
export declare namespace ElementMatch {
    interface Options {
        widen?: boolean | undefined;
        caseNotMatch?: unknown;
        caseWiden?: unknown;
        caseUnionNotMatch?: unknown;
    }
    interface DefaultOptions<Criteria> {
        widen: true;
        caseNotMatch: never;
        caseWiden: Criteria | undefined;
        caseUnionNotMatch: never;
    }
}
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