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actions.ts
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actions.ts
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export const onPending = (type: any) => `${type}_PENDING`;
export const onFulfilled = (type: any) => `${type}_FULFILLED`;
export const onRejected = (type: any) => `${type}_REJECTED`;
export interface IAction<Payload, Metadata = undefined> {
type: string;
payload?: Payload;
error?: boolean;
meta?: Metadata;
}
export type IThunk = (
dispatch: (action: any) => any,
getState: () => any
) => any;
export function createAction<Thunk extends IThunk, U extends any[]>(
type: string,
payloadCreator: (...args: U) => Thunk
): (...args: U) => Thunk;
export function createAction<Thunk extends IThunk, Metadata, U extends any[]>(
type: string,
payloadCreator: (...args: U) => Thunk,
metadataCreator?: (...args: U) => Metadata
): (...args: U) => Thunk;
export function createAction(
type: string
): () => IAction<undefined>;
export function createAction<Payload, U extends any[]>(
type: string,
payloadCreator: (...args: U) => Payload
): (...args: U) => IAction<Payload>;
export function createAction<Payload, Metadata, U extends any[]>(
type: string,
payloadCreator: (...args: U) => Payload,
metadataCreator?: (...args: U) => Metadata
): (...args: U) => IAction<Payload, Metadata>;
export function createAction<Payload, Metadata, U extends any[]>(
type: string,
payloadCreator?: (...args: U) => Payload,
metadataCreator?: (...args: U) => Metadata
) {
return Object.assign(
(...args: U) => {
const payload = (payloadCreator && payloadCreator(...args));
const meta = (metadataCreator && metadataCreator(...args));
if (typeof payload === 'function') {
return payload;
}
return {
type,
...(payload && { payload }),
...(meta && { meta }),
};
},
{ toString: () => type }
);
}
export interface IAsyncActionFunction<Payload> extends Function {
pending: () => IAction<undefined>;
fulfilled: (payload: Payload) => IAction<Payload>;
rejected: (payload?: any) => IAction<any>;
}
export function createAsyncAction<Payload, Metadata, U extends any[]>(
type: string,
payloadCreator: (...args: U) => Promise<Payload>,
metadataCreator?: (...args: U) => Metadata
) {
return Object.assign(
createAction(type, payloadCreator, metadataCreator),
{
toString: () => {
throw new Error(`Async action ${type} must be handled with pending, fulfilled or rejected`);
},
},
{
pending: createAction(onPending(type)),
fulfilled: createAction(onFulfilled(type), (payload: Payload) => payload),
rejected: createAction(onRejected(type), (payload: any) => payload),
}
);
}