type-plus/esm/tuple/tuple_plus.find.d.ts

Provides additional types for TypeScript.

import type { ElementMatch } from '../array/array_plus.element_match.js';
import type { NeverType } from '../never/never_type.js';
import type { MergeOptions } from '../utils/options.js';
import type { TupleType } from './tuple_type.js';
/**
 * 🦴 *utilities*
 * 🔢 *customizable*
 *
 * Find the first type in tuple `A` that matches `Criteria`.
 *
 * @example
 * ```ts
 * type R = TuplePlus.Find<[true, 1, 'x', 3], string> // 'x'
 * type R = TuplePlus.Find<[true, 1, 'x', 3], number> // 1
 * type R = TuplePlus.Find<[string, number, 1], 1> // widen: 1 | undefined
 * type R = TuplePlus.Find<[true, number | string], string> // unionMiss: string | undefined
 *
 * type R = TuplePlus.Find<[true, 1, 'x'], 2> // never
 * ```
 *
 * @typeParam Options['widen'] performs widen match.
 * Default to `true`.
 * With widen match, a narrowed type will match its widen type.
 * e.g. matching `1` against `number` yields `1 | undefined`
 *
 * The widen behavior can be customized by `Options['caseWiden']`
 *
 * @typeParam Options['caseArray'] return type when `A` is an array. Default to `not supported` message.
 *
 * @typeParam Options['caseEmptyTuple'] return type when `A` is an empty tuple.
 * Default to `never`.
 *
 * @typeParam Options['caseNever'] return type when `A` is `never`. Default to `never`.
 *
 * @typeParam Options['caseNotMatch'] Return value when `T` does not match `Criteria`.
 * Default to `never`.
 *
 * @typeParam Options['caseWiden'] return type when `T` in `A` is a widen type of `Criteria`.
 * Default to `Criteria | undefined`.
 * Set it to `never` for a more type-centric behavior
 *
 * @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.
 */
export type Find<A extends unknown[], Criteria, Options extends Find.Options = Find.DefaultOptions<Criteria>> = MergeOptions<Options, Find.DefaultOptions<Criteria>> extends infer O extends Find.Options ? TupleType<A, A['length'] extends 0 ? O['caseEmptyTuple'] : Find.Device<A, Criteria, O>, O['caseArray'], O> : never;
export declare namespace Find {
    type Device<A extends unknown[], Criteria, Options extends Find.Options> = A['length'] extends 0 ? Options['caseNotMatch'] : (A extends [infer Head, ...infer Tail] ? ElementMatch<Head, Criteria, MergeOptions<{
        caseNotMatch: Device<Tail, Criteria, Options>;
    }, Options>> : never);
    interface Options extends ElementMatch.Options, NeverType.Options {
        caseArray?: unknown;
        caseEmptyTuple?: unknown;
    }
    interface DefaultOptions<Criteria> extends ElementMatch.DefaultOptions<Criteria>, NeverType.DefaultOptions {
        caseArray: 'does not support array. Please use `FindFirst` or `ArrayPlus.Find` instead.';
        caseEmptyTuple: never;
    }
}
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