Function that generates redux action creator

createAction.ts

type ResolveType<T> = T extends (...args: any[]) => Record<string, unknown>
    ? T
    : { [K in keyof T]: T[K] };

export function createAction<
    Type extends string,
    Args extends any[] = [],
    Return extends Record<string, unknown> = Record<string, unknown>
>(
    type: Type,
    createHandler?: (...args: Args) => Return,
): (...args: Args) => ResolveType<{ type: Type } & Return> & { type: Type } {
    const actionCreator = (...args: Args): ResolveType<{ type: Type } & Return> & { type: Type } => {
        const customProps = createHandler != null ? createHandler(...args) : {};
        return { type, ...customProps } as ResolveType<{ type: Type } & Return>;
    };

    return Object.assign(actionCreator, { type });
}

export default createAction;