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createAction.ts
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createAction.ts
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// eslint-disable-next-line no-unused-vars
import { FSA } from 'flux-standard-action';
export interface ReduxFluentAction<
T extends string = string,
P = any,
M = any,
> extends FSA<P, M> {
type: T;
error: boolean;
}
type Formatter<T, R> = (rawPayload: any, rawMeta: any, T: T) => R;
export type RFA<T extends string = string, P = any, M = any> = ReduxFluentAction<T, P, M>;
export interface ActionCreator<T extends string, P, M> {
(rawPayload?: any, rawMeta?: any): RFA<T, P, M>;
type: T;
}
export function createAction<T extends string = string, P = void, M = void>(
type: T,
payloadCreator?: Formatter<T, P>,
metaCreator?: Formatter<T, M>,
): ActionCreator<T, P, M> {
const $payloadCreator = payloadCreator || (p => p);
const $metaCreator = metaCreator || ((_, m) => m);
function $action(rawPayload?: any, rawMeta?: any): RFA<T, P, M> {
const payload: P = $payloadCreator(rawPayload, rawMeta, type);
const meta: M = $metaCreator(rawPayload, rawMeta, type);
const res: RFA<T, P, M> = {
type,
error: payload instanceof Error,
};
if (payload !== undefined) {
res.payload = payload;
}
if (meta !== undefined) {
res.meta = meta;
}
return Object.freeze(res);
}
Object.defineProperties($action, {
name: { configurable: true, value: `action('${type}')` },
toString: { value: () => type },
type: { enumerable: true, value: type },
});
// @ts-ignore TS2322 property `type` is defined in Object.defineProperties($action, ...)
return $action;
}