@johngw/stream/dist/es/transformers/stateReducer/Input.d.ts

Reactive programming tools using the WHATWG Streams API.

import { L, U } from 'ts-toolbelt';
import { StateReducerInit } from '#transformers/stateReducer/Reducers';
/**
 * Represents the Readable (input) types of StateReducer actions.
 *
 * @group Transformers
 * @example
 * ```
 * type T = StateReducerInput<{ foo: string, bar: number, nothing: void }>
 * // | { action: 'foo', param: string }
 * // | { action: 'bar', param: number }
 * // | { action: 'nothing' }
 * ```
 */
export type StateReducerInput<Actions extends Record<string, unknown>> = AccumulateStateReducerInput<Actions, U.ListOf<keyof Actions>, {
    action: StateReducerInit;
    param: void;
}>;
/**
 * {@inheritdoc StateReducerInput}
 */
type AccumulateStateReducerInput<Actions extends Record<string, unknown>, ActionNames extends readonly (keyof Actions)[], Acc extends {
    action: keyof Actions;
    param: unknown;
}> = ActionNames['length'] extends 0 ? Acc : AccumulateStateReducerInput<Actions, L.Tail<ActionNames>, Acc | {
    action: L.Head<ActionNames>;
    param: Actions[L.Head<ActionNames>];
}>;
export {};