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/**
* An *action* is a plain object that represents an intention to change the
* state. Actions are the only way to get data into the store. Any data,
* whether from UI events, network callbacks, or other sources such as
* WebSockets needs to eventually be dispatched as actions.
*
* Actions must have a `type` field that indicates the type of action being
* performed. Types can be defined as constants and imported from another
* module. It's better to use strings for `type` than Symbols because strings
* are serializable.
*
* Other than `type`, the structure of an action object is really up to you.
* If you're interested, check out Flux Standard Action for recommendations on
* how actions should be constructed.
*
* @template T the type of the action's `type` tag.
*/
export interface Action<T = any> {
type: T
}
/**
* An Action type which accepts any other properties.
* This is mainly for the use of the `Reducer` type.
* This is not part of `Action` itself to prevent types that extend `Action` from
* having an index signature.
*/
export interface AnyAction extends Action {
// Allows any extra properties to be defined in an action.
[extraProps: string]: any
}
/**
* Internal "virtual" symbol used to make the `CombinedState` type unique.
*/
declare const $CombinedState: unique symbol
/**
* State base type for reducers created with `combineReducers()`.
*
* This type allows the `createStore()` method to infer which levels of the
* preloaded state can be partial.
*
* Because Typescript is really duck-typed, a type needs to have some
* identifying property to differentiate it from other types with matching
* prototypes for type checking purposes. That's why this type has the
* `$CombinedState` symbol property. Without the property, this type would
* match any object. The symbol doesn't really exist because it's an internal
* (i.e. not exported), and internally we never check its value. Since it's a
* symbol property, it's not expected to be unumerable, and the value is
* typed as always undefined, so its never expected to have a meaningful
* value anyway. It just makes this type distinquishable from plain `{}`.
*/
interface EmptyObject {
readonly [$CombinedState]?: undefined
}
export type CombinedState<S> = EmptyObject & S
/**
* Recursively makes combined state objects partial. Only combined state _root
* objects_ (i.e. the generated higher level object with keys mapping to
* individual reducers) are partial.
*/
export type PreloadedState<S> = Required<S> extends EmptyObject
? S extends CombinedState<infer S1>
? {
[K in keyof S1]?: S1[K] extends object ? PreloadedState<S1[K]> : S1[K]
}
: S
: {
[K in keyof S]: S[K] extends string | number | boolean | symbol
? S[K]
: PreloadedState<S[K]>
}
/* reducers */
/**
* A *reducer* (also called a *reducing function*) is a function that accepts
* an accumulation and a value and returns a new accumulation. They are used
* to reduce a collection of values down to a single value
*
* Reducers are not unique to Reduxthey are a fundamental concept in
* functional programming. Even most non-functional languages, like
* JavaScript, have a built-in API for reducing. In JavaScript, it's
* `Array.prototype.reduce()`.
*
* In Redux, the accumulated value is the state object, and the values being
* accumulated are actions. Reducers calculate a new state given the previous
* state and an action. They must be *pure functions*functions that return
* the exact same output for given inputs. They should also be free of
* side-effects. This is what enables exciting features like hot reloading and
* time travel.
*
* Reducers are the most important concept in Redux.
*
* *Do not put API calls into reducers.*
*
* @template S The type of state consumed and produced by this reducer.
* @template A The type of actions the reducer can potentially respond to.
*/
export type Reducer<S = any, A extends Action = AnyAction> = (
state: S | undefined,
action: A
) => S
/**
* Object whose values correspond to different reducer functions.
*
* @template A The type of actions the reducers can potentially respond to.
*/
export type ReducersMapObject<S = any, A extends Action = Action> = {
[K in keyof S]: Reducer<S[K], A>
}
/**
* Infer a combined state shape from a `ReducersMapObject`.
*
* @template M Object map of reducers as provided to `combineReducers(map: M)`.
*/
export type StateFromReducersMapObject<M> = M extends ReducersMapObject<
any,
any
>
? { [P in keyof M]: M[P] extends Reducer<infer S, any> ? S : never }
: never
/**
* Infer reducer union type from a `ReducersMapObject`.
*
* @template M Object map of reducers as provided to `combineReducers(map: M)`.
*/
export type ReducerFromReducersMapObject<M> = M extends {
[P in keyof M]: infer R
}
? R extends Reducer<any, any>
? R
: never
: never
/**
* Infer action type from a reducer function.
*
* @template R Type of reducer.
*/
export type ActionFromReducer<R> = R extends Reducer<any, infer A> ? A : never
/**
* Infer action union type from a `ReducersMapObject`.
*
* @template M Object map of reducers as provided to `combineReducers(map: M)`.
*/
export type ActionFromReducersMapObject<M> = M extends ReducersMapObject<
any,
any
>
? ActionFromReducer<ReducerFromReducersMapObject<M>>
: never
/**
* Turns an object whose values are different reducer functions, into a single
* reducer function. It will call every child reducer, and gather their results
* into a single state object, whose keys correspond to the keys of the passed
* reducer functions.
*
* @template S Combined state object type.
*
* @param reducers An object whose values correspond to different reducer
* functions that need to be combined into one. One handy way to obtain it
* is to use ES6 `import * as reducers` syntax. The reducers may never
* return undefined for any action. Instead, they should return their
* initial state if the state passed to them was undefined, and the current
* state for any unrecognized action.
*
* @returns A reducer function that invokes every reducer inside the passed
* object, and builds a state object with the same shape.
*/
export function combineReducers<S>(
reducers: ReducersMapObject<S, any>
): Reducer<CombinedState<S>>
export function combineReducers<S, A extends Action = AnyAction>(
reducers: ReducersMapObject<S, A>
): Reducer<CombinedState<S>, A>
export function combineReducers<M extends ReducersMapObject<any, any>>(
reducers: M
): Reducer<
CombinedState<StateFromReducersMapObject<M>>,
ActionFromReducersMapObject<M>
>
/* store */
/**
* A *dispatching function* (or simply *dispatch function*) is a function that
* accepts an action or an async action; it then may or may not dispatch one
* or more actions to the store.
*
* We must distinguish between dispatching functions in general and the base
* `dispatch` function provided by the store instance without any middleware.
*
* The base dispatch function *always* synchronously sends an action to the
* store's reducer, along with the previous state returned by the store, to
* calculate a new state. It expects actions to be plain objects ready to be
* consumed by the reducer.
*
* Middleware wraps the base dispatch function. It allows the dispatch
* function to handle async actions in addition to actions. Middleware may
* transform, delay, ignore, or otherwise interpret actions or async actions
* before passing them to the next middleware.
*
* @template A The type of things (actions or otherwise) which may be
* dispatched.
*/
export interface Dispatch<A extends Action = AnyAction> {
<T extends A>(action: T): T
}
/**
* Function to remove listener added by `Store.subscribe()`.
*/
export interface Unsubscribe {
(): void
}
declare global {
interface SymbolConstructor {
readonly observable: symbol
}
}
/**
* A minimal observable of state changes.
* For more information, see the observable proposal:
* https://github.com/tc39/proposal-observable
*/
export type Observable<T> = {
/**
* The minimal observable subscription method.
* @param {Object} observer Any object that can be used as an observer.
* The observer object should have a `next` method.
* @returns {subscription} An object with an `unsubscribe` method that can
* be used to unsubscribe the observable from the store, and prevent further
* emission of values from the observable.
*/
subscribe: (observer: Observer<T>) => { unsubscribe: Unsubscribe }
[Symbol.observable](): Observable<T>
}
/**
* An Observer is used to receive data from an Observable, and is supplied as
* an argument to subscribe.
*/
export type Observer<T> = {
next?(value: T): void
}
/**
* A store is an object that holds the application's state tree.
* There should only be a single store in a Redux app, as the composition
* happens on the reducer level.
*
* @template S The type of state held by this store.
* @template A the type of actions which may be dispatched by this store.
*/
export interface Store<S = any, A extends Action = AnyAction> {
/**
* Dispatches an action. It is the only way to trigger a state change.
*
* The `reducer` function, used to create the store, will be called with the
* current state tree and the given `action`. Its return value will be
* considered the **next** state of the tree, and the change listeners will
* be notified.
*
* The base implementation only supports plain object actions. If you want
* to dispatch a Promise, an Observable, a thunk, or something else, you
* need to wrap your store creating function into the corresponding
* middleware. For example, see the documentation for the `redux-thunk`
* package. Even the middleware will eventually dispatch plain object
* actions using this method.
*
* @param action A plain object representing what changed. It is a good
* idea to keep actions serializable so you can record and replay user
* sessions, or use the time travelling `redux-devtools`. An action must
* have a `type` property which may not be `undefined`. It is a good idea
* to use string constants for action types.
*
* @returns For convenience, the same action object you dispatched.
*
* Note that, if you use a custom middleware, it may wrap `dispatch()` to
* return something else (for example, a Promise you can await).
*/
dispatch: Dispatch<A>
/**
* Reads the state tree managed by the store.
*
* @returns The current state tree of your application.
*/
getState(): S
/**
* Adds a change listener. It will be called any time an action is
* dispatched, and some part of the state tree may potentially have changed.
* You may then call `getState()` to read the current state tree inside the
* callback.
*
* You may call `dispatch()` from a change listener, with the following
* caveats:
*
* 1. The subscriptions are snapshotted just before every `dispatch()` call.
* If you subscribe or unsubscribe while the listeners are being invoked,
* this will not have any effect on the `dispatch()` that is currently in
* progress. However, the next `dispatch()` call, whether nested or not,
* will use a more recent snapshot of the subscription list.
*
* 2. The listener should not expect to see all states changes, as the state
* might have been updated multiple times during a nested `dispatch()` before
* the listener is called. It is, however, guaranteed that all subscribers
* registered before the `dispatch()` started will be called with the latest
* state by the time it exits.
*
* @param listener A callback to be invoked on every dispatch.
* @returns A function to remove this change listener.
*/
subscribe(listener: () => void): Unsubscribe
/**
* Replaces the reducer currently used by the store to calculate the state.
*
* You might need this if your app implements code splitting and you want to
* load some of the reducers dynamically. You might also need this if you
* implement a hot reloading mechanism for Redux.
*
* @param nextReducer The reducer for the store to use instead.
*/
replaceReducer(nextReducer: Reducer<S, A>): void
/**
* Interoperability point for observable/reactive libraries.
* @returns {observable} A minimal observable of state changes.
* For more information, see the observable proposal:
* https://github.com/tc39/proposal-observable
*/
[Symbol.observable](): Observable<S>
}
export type DeepPartial<T> = {
[K in keyof T]?: T[K] extends object ? DeepPartial<T[K]> : T[K]
}
/**
* A store creator is a function that creates a Redux store. Like with
* dispatching function, we must distinguish the base store creator,
* `createStore(reducer, preloadedState)` exported from the Redux package, from
* store creators that are returned from the store enhancers.
*
* @template S The type of state to be held by the store.
* @template A The type of actions which may be dispatched.
* @template Ext Store extension that is mixed in to the Store type.
* @template StateExt State extension that is mixed into the state type.
*/
export interface StoreCreator {
<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
enhancer?: StoreEnhancer<Ext, StateExt>
): Store<S & StateExt, A> & Ext
<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
preloadedState?: PreloadedState<S>,
enhancer?: StoreEnhancer<Ext>
): Store<S & StateExt, A> & Ext
}
/**
* @deprecated
*
* **We recommend using the `configureStore` method
* of the `@reduxjs/toolkit` package**, which replaces `createStore`.
*
* Redux Toolkit is our recommended approach for writing Redux logic today,
* including store setup, reducers, data fetching, and more.
*
* **For more details, please read this Redux docs page:**
* **https://redux.js.org/introduction/why-rtk-is-redux-today**
*
* `configureStore` from Redux Toolkit is an improved version of `createStore` that
* simplifies setup and helps avoid common bugs.
*
* You should not be using the `redux` core package by itself today, except for learning purposes.
* The `createStore` method from the core `redux` package will not be removed, but we encourage
* all users to migrate to using Redux Toolkit for all Redux code.
*
* If you want to use `createStore` without this visual deprecation warning, use
* the `legacy_createStore` import instead:
*
* `import { legacy_createStore as createStore} from 'redux'`
*
*/
export declare function createStore<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
enhancer?: StoreEnhancer<Ext, StateExt>
): Store<S & StateExt, A> & Ext
/**
* @deprecated
*
* **We recommend using the `configureStore` method
* of the `@reduxjs/toolkit` package**, which replaces `createStore`.
*
* Redux Toolkit is our recommended approach for writing Redux logic today,
* including store setup, reducers, data fetching, and more.
*
* **For more details, please read this Redux docs page:**
* **https://redux.js.org/introduction/why-rtk-is-redux-today**
*
* `configureStore` from Redux Toolkit is an improved version of `createStore` that
* simplifies setup and helps avoid common bugs.
*
* You should not be using the `redux` core package by itself today, except for learning purposes.
* The `createStore` method from the core `redux` package will not be removed, but we encourage
* all users to migrate to using Redux Toolkit for all Redux code.
*
* If you want to use `createStore` without this visual deprecation warning, use
* the `legacy_createStore` import instead:
*
* `import { legacy_createStore as createStore} from 'redux'`
*
*/
export declare function createStore<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
preloadedState?: PreloadedState<S>,
enhancer?: StoreEnhancer<Ext>
): Store<S & StateExt, A> & Ext
/**
* Creates a Redux store that holds the state tree.
*
* **We recommend using `configureStore` from the
* `@reduxjs/toolkit` package**, which replaces `createStore`:
* **https://redux.js.org/introduction/why-rtk-is-redux-today**
*
* The only way to change the data in the store is to call `dispatch()` on it.
*
* There should only be a single store in your app. To specify how different
* parts of the state tree respond to actions, you may combine several reducers
* into a single reducer function by using `combineReducers`.
*
* @param {Function} reducer A function that returns the next state tree, given
* the current state tree and the action to handle.
*
* @param {any} [preloadedState] The initial state. You may optionally specify it
* to hydrate the state from the server in universal apps, or to restore a
* previously serialized user session.
* If you use `combineReducers` to produce the root reducer function, this must be
* an object with the same shape as `combineReducers` keys.
*
* @param {Function} [enhancer] The store enhancer. You may optionally specify it
* to enhance the store with third-party capabilities such as middleware,
* time travel, persistence, etc. The only store enhancer that ships with Redux
* is `applyMiddleware()`.
*
* @returns {Store} A Redux store that lets you read the state, dispatch actions
* and subscribe to changes.
*/
export declare function legacy_createStore<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
enhancer?: StoreEnhancer<Ext, StateExt>
): Store<S & StateExt, A> & Ext
/**
* Creates a Redux store that holds the state tree.
*
* **We recommend using `configureStore` from the
* `@reduxjs/toolkit` package**, which replaces `createStore`:
* **https://redux.js.org/introduction/why-rtk-is-redux-today**
*
* The only way to change the data in the store is to call `dispatch()` on it.
*
* There should only be a single store in your app. To specify how different
* parts of the state tree respond to actions, you may combine several reducers
* into a single reducer function by using `combineReducers`.
*
* @param {Function} reducer A function that returns the next state tree, given
* the current state tree and the action to handle.
*
* @param {any} [preloadedState] The initial state. You may optionally specify it
* to hydrate the state from the server in universal apps, or to restore a
* previously serialized user session.
* If you use `combineReducers` to produce the root reducer function, this must be
* an object with the same shape as `combineReducers` keys.
*
* @param {Function} [enhancer] The store enhancer. You may optionally specify it
* to enhance the store with third-party capabilities such as middleware,
* time travel, persistence, etc. The only store enhancer that ships with Redux
* is `applyMiddleware()`.
*
* @returns {Store} A Redux store that lets you read the state, dispatch actions
* and subscribe to changes.
*/
export declare function legacy_createStore<S, A extends Action, Ext, StateExt>(
reducer: Reducer<S, A>,
preloadedState?: PreloadedState<S>,
enhancer?: StoreEnhancer<Ext>
): Store<S & StateExt, A> & Ext
/**
* A store enhancer is a higher-order function that composes a store creator
* to return a new, enhanced store creator. This is similar to middleware in
* that it allows you to alter the store interface in a composable way.
*
* Store enhancers are much the same concept as higher-order components in
* React, which are also occasionally called component enhancers.
*
* Because a store is not an instance, but rather a plain-object collection of
* functions, copies can be easily created and modified without mutating the
* original store. There is an example in `compose` documentation
* demonstrating that.
*
* Most likely you'll never write a store enhancer, but you may use the one
* provided by the developer tools. It is what makes time travel possible
* without the app being aware it is happening. Amusingly, the Redux
* middleware implementation is itself a store enhancer.
*
* @template Ext Store extension that is mixed into the Store type.
* @template StateExt State extension that is mixed into the state type.
*/
export type StoreEnhancer<Ext = {}, StateExt = {}> = (
next: StoreEnhancerStoreCreator
) => StoreEnhancerStoreCreator<Ext, StateExt>
export type StoreEnhancerStoreCreator<Ext = {}, StateExt = {}> = <
S = any,
A extends Action = AnyAction
>(
reducer: Reducer<S, A>,
preloadedState?: PreloadedState<S>
) => Store<S & StateExt, A> & Ext
/* middleware */
export interface MiddlewareAPI<D extends Dispatch = Dispatch, S = any> {
dispatch: D
getState(): S
}
/**
* A middleware is a higher-order function that composes a dispatch function
* to return a new dispatch function. It often turns async actions into
* actions.
*
* Middleware is composable using function composition. It is useful for
* logging actions, performing side effects like routing, or turning an
* asynchronous API call into a series of synchronous actions.
*
* @template DispatchExt Extra Dispatch signature added by this middleware.
* @template S The type of the state supported by this middleware.
* @template D The type of Dispatch of the store where this middleware is
* installed.
*/
export interface Middleware<
DispatchExt = {},
S = any,
D extends Dispatch = Dispatch
> {
(api: MiddlewareAPI<D, S>): (
next: Dispatch<AnyAction>
) => (action: any) => any
}
/**
* Creates a store enhancer that applies middleware to the dispatch method
* of the Redux store. This is handy for a variety of tasks, such as
* expressing asynchronous actions in a concise manner, or logging every
* action payload.
*
* See `redux-thunk` package as an example of the Redux middleware.
*
* Because middleware is potentially asynchronous, this should be the first
* store enhancer in the composition chain.
*
* Note that each middleware will be given the `dispatch` and `getState`
* functions as named arguments.
*
* @param middlewares The middleware chain to be applied.
* @returns A store enhancer applying the middleware.
*
* @template Ext Dispatch signature added by a middleware.
* @template S The type of the state supported by a middleware.
*/
export function applyMiddleware(): StoreEnhancer
export function applyMiddleware<Ext1, S>(
middleware1: Middleware<Ext1, S, any>
): StoreEnhancer<{ dispatch: Ext1 }>
export function applyMiddleware<Ext1, Ext2, S>(
middleware1: Middleware<Ext1, S, any>,
middleware2: Middleware<Ext2, S, any>
): StoreEnhancer<{ dispatch: Ext1 & Ext2 }>
export function applyMiddleware<Ext1, Ext2, Ext3, S>(
middleware1: Middleware<Ext1, S, any>,
middleware2: Middleware<Ext2, S, any>,
middleware3: Middleware<Ext3, S, any>
): StoreEnhancer<{ dispatch: Ext1 & Ext2 & Ext3 }>
export function applyMiddleware<Ext1, Ext2, Ext3, Ext4, S>(
middleware1: Middleware<Ext1, S, any>,
middleware2: Middleware<Ext2, S, any>,
middleware3: Middleware<Ext3, S, any>,
middleware4: Middleware<Ext4, S, any>
): StoreEnhancer<{ dispatch: Ext1 & Ext2 & Ext3 & Ext4 }>
export function applyMiddleware<Ext1, Ext2, Ext3, Ext4, Ext5, S>(
middleware1: Middleware<Ext1, S, any>,
middleware2: Middleware<Ext2, S, any>,
middleware3: Middleware<Ext3, S, any>,
middleware4: Middleware<Ext4, S, any>,
middleware5: Middleware<Ext5, S, any>
): StoreEnhancer<{ dispatch: Ext1 & Ext2 & Ext3 & Ext4 & Ext5 }>
export function applyMiddleware<Ext, S = any>(
...middlewares: Middleware<any, S, any>[]
): StoreEnhancer<{ dispatch: Ext }>
/* action creators */
/**
* An *action creator* is, quite simply, a function that creates an action. Do
* not confuse the two termsagain, an action is a payload of information, and
* an action creator is a factory that creates an action.
*
* Calling an action creator only produces an action, but does not dispatch
* it. You need to call the store's `dispatch` function to actually cause the
* mutation. Sometimes we say *bound action creators* to mean functions that
* call an action creator and immediately dispatch its result to a specific
* store instance.
*
* If an action creator needs to read the current state, perform an API call,
* or cause a side effect, like a routing transition, it should return an
* async action instead of an action.
*
* @template A Returned action type.
*/
export interface ActionCreator<A> {
(...args: any[]): A
}
/**
* Object whose values are action creator functions.
*/
export interface ActionCreatorsMapObject<A = any> {
[key: string]: ActionCreator<A>
}
/**
* Turns an object whose values are action creators, into an object with the
* same keys, but with every function wrapped into a `dispatch` call so they
* may be invoked directly. This is just a convenience method, as you can call
* `store.dispatch(MyActionCreators.doSomething())` yourself just fine.
*
* For convenience, you can also pass a single function as the first argument,
* and get a function in return.
*
* @param actionCreator An object whose values are action creator functions.
* One handy way to obtain it is to use ES6 `import * as` syntax. You may
* also pass a single function.
*
* @param dispatch The `dispatch` function available on your Redux store.
*
* @returns The object mimicking the original object, but with every action
* creator wrapped into the `dispatch` call. If you passed a function as
* `actionCreator`, the return value will also be a single function.
*/
export function bindActionCreators<A, C extends ActionCreator<A>>(
actionCreator: C,
dispatch: Dispatch
): C
export function bindActionCreators<
A extends ActionCreator<any>,
B extends ActionCreator<any>
>(actionCreator: A, dispatch: Dispatch): B
export function bindActionCreators<A, M extends ActionCreatorsMapObject<A>>(
actionCreators: M,
dispatch: Dispatch
): M
export function bindActionCreators<
M extends ActionCreatorsMapObject<any>,
N extends ActionCreatorsMapObject<any>
>(actionCreators: M, dispatch: Dispatch): N
/* compose */
type Func0<R> = () => R
type Func1<T1, R> = (a1: T1) => R
type Func2<T1, T2, R> = (a1: T1, a2: T2) => R
type Func3<T1, T2, T3, R> = (a1: T1, a2: T2, a3: T3, ...args: any[]) => R
/**
* Composes single-argument functions from right to left. The rightmost
* function can take multiple arguments as it provides the signature for the
* resulting composite function.
*
* @param funcs The functions to compose.
* @returns R function obtained by composing the argument functions from right
* to left. For example, `compose(f, g, h)` is identical to doing
* `(...args) => f(g(h(...args)))`.
*/
export function compose(): <R>(a: R) => R
export function compose<F extends Function>(f: F): F
/* two functions */
export function compose<A, R>(f1: (b: A) => R, f2: Func0<A>): Func0<R>
export function compose<A, T1, R>(
f1: (b: A) => R,
f2: Func1<T1, A>
): Func1<T1, R>
export function compose<A, T1, T2, R>(
f1: (b: A) => R,
f2: Func2<T1, T2, A>
): Func2<T1, T2, R>
export function compose<A, T1, T2, T3, R>(
f1: (b: A) => R,
f2: Func3<T1, T2, T3, A>
): Func3<T1, T2, T3, R>
/* three functions */
export function compose<A, B, R>(
f1: (b: B) => R,
f2: (a: A) => B,
f3: Func0<A>
): Func0<R>
export function compose<A, B, T1, R>(
f1: (b: B) => R,
f2: (a: A) => B,
f3: Func1<T1, A>
): Func1<T1, R>
export function compose<A, B, T1, T2, R>(
f1: (b: B) => R,
f2: (a: A) => B,
f3: Func2<T1, T2, A>
): Func2<T1, T2, R>
export function compose<A, B, T1, T2, T3, R>(
f1: (b: B) => R,
f2: (a: A) => B,
f3: Func3<T1, T2, T3, A>
): Func3<T1, T2, T3, R>
/* four functions */
export function compose<A, B, C, R>(
f1: (b: C) => R,
f2: (a: B) => C,
f3: (a: A) => B,
f4: Func0<A>
): Func0<R>
export function compose<A, B, C, T1, R>(
f1: (b: C) => R,
f2: (a: B) => C,
f3: (a: A) => B,
f4: Func1<T1, A>
): Func1<T1, R>
export function compose<A, B, C, T1, T2, R>(
f1: (b: C) => R,
f2: (a: B) => C,
f3: (a: A) => B,
f4: Func2<T1, T2, A>
): Func2<T1, T2, R>
export function compose<A, B, C, T1, T2, T3, R>(
f1: (b: C) => R,
f2: (a: B) => C,
f3: (a: A) => B,
f4: Func3<T1, T2, T3, A>
): Func3<T1, T2, T3, R>
/* rest */
export function compose<R>(
f1: (b: any) => R,
...funcs: Function[]
): (...args: any[]) => R
export function compose<R>(...funcs: Function[]): (...args: any[]) => R