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export const ACTION_MODE_SINGLE = 'single';
export type ActionModeSingle = typeof ACTION_MODE_SINGLE;
export const ACTION_MODE_MULTI = 'multi';
export type ActionModeMulti = typeof ACTION_MODE_MULTI;
export type ActionMode = ActionModeSingle | ActionModeMulti;
export interface Action<Payload = any, Mode extends ActionMode = ActionMode> {
readonly type: string;
readonly mode: Mode;
readonly creator: ActionCreator<Payload>;
readonly payload: Payload;
}
export type Payload<T> = T extends ActionCreator<infer P> ? P : never;
export interface ActionCreator<
Payload = any,
Mode extends ActionMode = ActionMode,
Arguments extends any[] = [Payload],
S extends Action<Payload, Mode> = Action<Payload, Mode>
> {
(...args: Arguments): S;
readonly type: string;
readonly mode: Mode;
}
export function actionCreatorSingle<Payload = any>(type: string): ActionCreator<Payload, ActionModeSingle, [Payload]> {
function ActionCreator(payload: Payload) {
return {
type,
mode: ACTION_MODE_SINGLE as ActionModeSingle,
payload,
creator: ActionCreator,
};
}
ActionCreator.type = type;
ActionCreator.mode = ACTION_MODE_SINGLE as ActionModeSingle;
return ActionCreator;
}
export function actionCreatorMulti<Payload = any>(type: string): ActionCreator<Payload, ActionModeMulti, [Payload]> {
function ActionCreator(payload: Payload) {
return {
type,
mode: ACTION_MODE_MULTI as ActionModeMulti,
payload,
creator: ActionCreator,
};
}
ActionCreator.type = type;
ActionCreator.mode = ACTION_MODE_MULTI as ActionModeMulti;
return ActionCreator;
}
export function actionCreator<Payload = any>(
type: string,
mode?: ActionModeSingle
): ActionCreator<Payload, ActionModeSingle>;
export function actionCreator<Payload = any>(
type: string,
mode: ActionModeMulti
): ActionCreator<Payload, ActionModeMulti>;
export function actionCreator<Payload = any>(
type: string,
mode: ActionMode = ACTION_MODE_SINGLE
): ActionCreator<Payload> {
if (mode === ACTION_MODE_SINGLE) {
return actionCreatorSingle<Payload>(type);
} else if (mode === ACTION_MODE_MULTI) {
return actionCreatorMulti<Payload>(type);
} else {
throw new FlowfulError(
`[Flowful][actionCreator] Invalid mode: "${mode}" for action "${type}". Must be "${ACTION_MODE_SINGLE}" or "${ACTION_MODE_MULTI}".`,
{ type, mode }
);
}
}
export function actionCreatorDefault<Payload = any>(
type: string,
defaultPayload: Payload,
mode?: ActionModeSingle
): ActionCreator<Payload, ActionModeSingle, [Payload] | []>;
export function actionCreatorDefault<Payload = any>(
type: string,
defaultPayload: Payload,
mode: ActionModeMulti
): ActionCreator<Payload, ActionModeMulti, [Payload] | []>;
export function actionCreatorDefault<Payload = any, Mode extends ActionMode = ActionModeSingle>(
type: string,
defaultPayload: Payload,
mode?: Mode
): ActionCreator<Payload, Mode, [Payload] | []> {
if (mode === undefined) {
mode = ACTION_MODE_SINGLE as Mode;
}
if (mode !== ACTION_MODE_SINGLE && mode !== ACTION_MODE_MULTI) {
throw new FlowfulError(
`[Flowful][actionCreatorDefault] Invalid action mode: "${mode}" for action "${type}". Must be "${ACTION_MODE_SINGLE}" or "${ACTION_MODE_MULTI}".`,
{ type, mode }
);
}
function ActionCreatorDefault(payload?: Payload) {
return {
type,
mode,
payload: payload !== undefined ? payload : defaultPayload,
creator: ActionCreatorDefault,
};
}
ActionCreatorDefault.type = type;
ActionCreatorDefault.mode = mode;
return ActionCreatorDefault as ActionCreator<Payload, Mode, [Payload] | []>;
}
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