Enables simple, yet robust handling of async action creators in Redux

Overview

Redux Promise Middleware

Build Status npm downloads

Redux Promise Middleware enables simple, yet robust handling of async action creators in Redux.

const asyncAction = () => ({
  type: 'PROMISE',
  payload: new Promise(...),
})

Given a single action with an async payload, the middleware transforms the action to a separate pending action and a separate fulfilled/rejected action, representing the states of the async action.

The middleware can be combined with Redux Thunk to chain action creators.

const secondAction = (data) => ({
  type: 'SECOND',
  payload: {...},
})

const firstAction = () => {
  return (dispatch) => {
    const response = dispatch({
      type: 'FIRST',
      payload: new Promise(...),
    })

    response.then((data) => {
      dispatch(secondAction(data))
    })
  }
}

Documentation and Help

Heads Up: Version 6 includes some breaking changes. Check the upgrading guide for help.

Issues

For bug reports and feature requests, file an issue on GitHub.

For help, ask a question on StackOverflow.

Releases

For older versions:

Maintainers

Please reach out to us if you have any questions or comments.

Patrick Burtchaell (pburtchaell):

Thomas Hudspith-Tatham (tomatau):

License

Code licensed with the MIT License (MIT).

Documentation licensed with the CC BY-NC License.

Comments
  • Async/Await Support

    Async/Await Support

    This PR adds support for native async / await functions.

    • There is a special handler when the promise is a function with a constructor named AsyncFunction (as they are in Node and modern browsers)
    • In order to support compiled async/await code, it also calls the function and checks if the result is a promise.
    • When calling the function, it passes dispatch and getState from redux, just like redux-thunk.

    So a (maybe silly) example from the guide goes from this:

    // fulfilled promise
    const foo = () => {
      return dispatch => {
    
        return dispatch({
          type: 'TYPE',
          payload: new Promise()
        }).then(() => dispatch(bar()));
      };
    }
    

    to this:

    const foo = () => ({
      type: 'TYPE',
      async payload(dispatch) {
        dispatch(bar());
      }
    });
    
    in progress 
    opened by mikew 35
  • Don't swallow errors

    Don't swallow errors

    It would be great to actually notify users on exceptions here: https://github.com/pburtchaell/redux-promise-middleware/blob/master/src/index.js#L54 vs recovering from the error.

    At least a hook that logs rejections cleanly for debugging. Currently this is basically a:

    try {
        return [action, false] 
    } catch (e) {
        return [action, true]
    }
    

    It would be useful to notify on rejections - maybe via taking a callback, so users don't get exceptions that are more silent by default.

    opened by benjamingr 27
  • Revoke 3.3.1, it's a mistake

    Revoke 3.3.1, it's a mistake

    • Never modify existing errors! You don't know which props are already set, JavaScript error can be subclassed fyi.
    • The API is super inconsistent now. And you added a circular dependency.
    • Use semantic versioning please, this was clearly a big breaking change. Don't lie and increment X from X.Y.Z. Thank you.

    Anyway, thank you for your work. The open source is hard.

    opened by steida 21
  • Original promise can be returned to avoid anti-pattern

    Original promise can be returned to avoid anti-pattern

    Version

    3.0.0

    Test Case

        it('propagates the original promise', async () => {
          const actionDispatched = store.dispatch({
            type: defaultPromiseAction.type,
            payload: Bluebird.resolve(promiseValue)
          });
    
          // Expect that the promise returned has bluebird functions available
          expect(actionDispatched.any).to.be.a('function');
    
          await actionDispatched.then(({ value, action }) => {
            expect(value).to.eql(promiseValue);
            expect(action).to.eql(fulfilledAction);
          });
        });
    

    Expected Behavior

    The original promise should be chained and returned.

    Actual Behavior

    A new native promise is created.


    I can't see any reason for creating a new promise and rejecting/resolving it. This perpetuates the deferred anti-pattern. When changing the code to return the original promise, all of the test suite continues to pass.

    If there is a reason that a new promise must be created (and that's fine if there is), then the reason is not covered in the tests.

    The code could be changed to:

          return promise.then(
            (value = null) => {
              const resolvedAction = getAction(value, false);
              dispatch(resolvedAction);
              return { value, action: resolvedAction };
            }).catch((reason = null) => {
              const rejectedAction = getAction(reason, true);
              dispatch(rejectedAction);
              const rejectedDetails = { reason, action: rejectedAction };
              throw rejectedDetails;
            });
    

    to allow any promise library to continue working as expected.

    Happy to submit a PR if this is a valid change.

    opened by Willyham 20
  • Examples

    Examples

    It would be good to add examples; sometimes seeing actual code is better than reading the README.

    • [x] Simple example without React
    • [x] A README with some concise explanations of action creators you could use
    • [ ] Example should demonstrate:
      • [ ] use the meta prop for more than just suffix configuration
      • [x] Combining redux-promise-middleware with redux-thunk
      • [ ] How to change routes with React Router when a promise is fulfilled

    EDIT: With the release of version 3.0.0, there is a simple and complex example of how to use the middleware. The simple example works, but the complex example is not finished. Help is wanted!

    help wanted 
    opened by pburtchaell 19
  • Create Typescript Definitions

    Create Typescript Definitions

    Create Typescript Definitions. There already exists one under @types/, but that one was not updated for a while and does not match the implementation. It also doesn't include types for PENDING/FULFILLED/REJECTED consts.

    in progress 
    opened by franklixuefei 18
  • Allow payloads of `0` or `false`

    Allow payloads of `0` or `false`

    When a Promise resolves with a value of 0 or false, include that value as the payload property of the FULFILLED action.

    The existing code omits the payload if it is any “falsy” value, which includes null, undefined, 0, and false.

    With this change, null and undefined payloads are still omitted, but 0 and false payloads are passed along with the FULFILLED action.

    A slightly more idiomatic check for a null or undefined payload would be newPayload == null, but that is disallowed by the lint configuration.

    I’ve added new specs for these cases, but they’re very similar to each other and have a fair bit of duplication with the null spec. I wasn’t sure what you might want to do to clean that up.

    opened by randycoulman 17
  • Add promise.prototype.finally support

    Add promise.prototype.finally support

    Contributing to #124

    This is still a draft, doc an test updates are still needed. Let's review this first.

    I added dispatchFinallyAction as flag in config, which defaults to false, in the future, if Promise.prototype.finally gets in standard we could change it.

    blocked 
    opened by notgiorgi 16
  • Testing strategies

    Testing strategies

    Are there any standard testing strategies for this library?

    • testing reducers

    • testing async action creators

    I would be interested in writing a docs PR if people could outline their testing strategies vs our own.

    documentation 
    opened by andrewmclagan 16
  • Provide dist files for old versions

    Provide dist files for old versions

    For help, use this template:

    Version Number

    Versions from v0.0.0-v3.3.1 published on NPM

    Hi @pburtchaell , I'm a member of cdnjs, we want to host this library. I found that there are no ReduxPromiseMiddleware.js and ReduxPromiseMiddleware.min.js before v3.3.2, but I think that are the files need to be hosted. Could you please provide these files from v0.0.0-v3.3.1? BTW, I'd like to confirm that if index.js and isPromise.js also need to be hosted or not? Thank you.

    https://github.com/cdnjs/cdnjs/issues/9544

    in progress 
    opened by pvnr0082t 16
  • Reduce boilerplate for reducers used with async actions

    Reduce boilerplate for reducers used with async actions

    When you have a reducer that is used with async actions, there is often a lot of boilerplate code that is required. For example, most of my reducers I use async actions with have a switch very similar to this:

    const defaultState = {
      isPending: undefined,
      isFulfilled: undefined,
      isRejected: undefined
    }
    
    switch (action.type) {
        case `${type}_PENDING`:
          return {
            ...state,
            ...defaultState,
            isPending: true
          };
    
        case `${type}_FULFILLED`:
          return {
            ...state,
            ...defaultState,
            isFulfilled: true,
            isSignedIn: true,
            token: action.payload
          };
    
        case `${type}_REJECTED`:
          return {
            ...state,
            ...defaultState,
            isRejected: true,
            error: action.payload
          };
    
       default: return state;
    }
    

    It would be nice to DRY up reducers that handle async actions and create a helper utility to do so.

    Related to a comment on #33.

    help wanted 
    opened by pburtchaell 16
Releases(6.1.3)
  • 6.1.3(Sep 26, 2022)

  • 6.1.2(Nov 5, 2019)

  • 6.1.1(Jun 15, 2019)

  • 6.1.0(Feb 14, 2019)

  • 6.0.1(Feb 7, 2019)

  • 6.0.0(Feb 3, 2019)

    Breaking Changes

    Previously, the middleware need to be instantiated with an optional configuration.

    import promiseMiddleware from 'redux-promise-middleware'
    
    applyMiddleware(
      promiseMiddleware({
        // Optional configuration
      }),
    )(createStore)
    This implementation enabled custom configuration, but, for most implementations, it is uncessary overhead.
    

    Now, the default export is preconfigured and ready to go.

    import promise from 'redux-promise-middleware'
    
    applyMiddleware(
      promise,
    )(createStore)
    

    We still support custom configuration. Check the upgrading guide for more help.

    Thanks to @rahulbdominic and @zhanyuzhang for assisting on this release.

    New

    • Updated TypeScript definitions with more robust types to use for async action creators (#234)
    Source code(tar.gz)
    Source code(zip)
  • 5.1.1(Apr 18, 2018)

  • 5.1.0(Apr 18, 2018)

  • 5.0.0(Nov 19, 2017)

    Breaking Changes 🔥 🚒

    The promiseTypeSeparator config property is now promiseTypeDelimiter.

    Why? Because delimiters are one or more characters used to specify the boundaries in strings. It’s a delimiter, not a separator!

    applyMiddleware(
      promiseMiddleware({
        promiseTypeDelimiter: '/'
      })
    )
    

    With the above configuration, given FOO async action, the type will be appended with a forward slash / delimiter.

    {
      type: 'FOO/PENDING'
    }
    

    New ✨

    • Async functions—using async/wait—are supported. Thanks to @mikew for the PR!
    • Development dependencies and example project dependencies are upgraded.
    • The middleware code comments were extended to provide a clearer picture of how it works.

    Here’s an async/await example:

    {
      type: 'TYPE',
      async payload () {
        const fooData = await getFooData();
        const barData = await getBarData(fooData);
    
        return barData;
      }
    }
    

    See the Async/Await guide for more.

    Source code(tar.gz)
    Source code(zip)
  • 4.4.0(Aug 27, 2017)

    This is a big release that adds new functionality and resolves #159, an outstanding issue from this summer.

    Here’s the complete list:

    • Reverts the changes from #126, subsequently released in version 4.3.0.
    • Resolves #159.
    • Adds support for ES6 Modules, thanks to @anajavi. This enables scope hosting on WebPack 3, saving a space and increasing performance.
    • Adds support for custom separators on action types, thanks to @roboslone. Now your actions can be customized to, for example, FOO/FULFILLED or FOO-FULLFILLED instead of FOO_FULFILLED.
    • Updates to WebPack 2, thanks to @GeKorm.
    • Changes UMD paths to dist/umd/redux-promise-middleware.js and dist/umd/redux-promise-middleware.min.js.
    Source code(tar.gz)
    Source code(zip)
  • 4.3.0(May 15, 2017)

    This release has been deprecated due to breaking changes in error handling.

    ~~This release fixes a bug when a dispatch call throws an error in handleFulfill, changing the promise state to rejected. This can happen when a reducer throws an error or a component's render throws as a result of a Redux store update.~~

    ~~Thanks to @danwang for the PR!~~

    Source code(tar.gz)
    Source code(zip)
  • 4.2.1(May 15, 2017)

    This release adds the default suffix types as module exports, as documented in the Introduction. This is useful for reducers.

    import { PENDING, FULFILLED, REJECTED } from 'redux-promise-middleware';
    
    export default function fooReducer(state = {}, action) {
      switch (action.type) {
        case `FOO_${FULFILLED}`:
          return ...
      }
    }
    

    Thanks to @piu130 for the PR!

    Source code(tar.gz)
    Source code(zip)
  • 4.2.0(Nov 29, 2016)

  • 4.1.0(Oct 8, 2016)

  • 4.0.0(Aug 22, 2016)

    This release introduces changes to error handling.

    Previously, the parameter of the rejected promise callback was both the dispatched action and an Error object. The middleware also always constructed a new Error object, which caused unexpected mutation and circular references.

    Now, the parameter of the rejected promise callback is the value of reject. The middleware does not construct a new error; it is your responsibility to make sure the promise is rejected with an Error object.

    // before
    const bar = () => ({
      type: 'FOO',
      payload: new Promise(() => {
        reject('foo');
      })
    });.then(() => null, ({ reason, action }) => {
      console.log(action.type): // => 'FOO'
      console.log(reason.message); // => 'foo'
    });
    
    // after
    const bar = () => ({
      type: 'FOO',
      payload: new Promise(() => {
    
        /**
         * Make sure the promise is rejected with an error. You
         * can also use `reject(new Error('foo'));`. It's a best
         * practice to reject a promise with an Error object.
         */
        throw new Error('foo');
      })
    });.then(() => null, error => {
      console.log(error instanceof Error); // => true
      console.log(error.message); // => 'foo'
    });
    
    Source code(tar.gz)
    Source code(zip)
  • 3.3.2(Jul 6, 2016)

    This release adds UMD (Universal Module Definition) build tasks. A UMD module is a "universal" module compatible either the AMD or CommonJS loaders, or no module loader at all. This blog post offers a comparison between the module types.

    The implementation is adapted from reactjs/react-router-redux@ad0d41d and uses a modified module definition to work around webpack/webpack#706. Specifically, this release uses the umd libraryTarget webpack option to "export to AMD, CommonJS2 or as property in root".

    Source code(tar.gz)
    Source code(zip)
  • 3.3.1(Jul 5, 2016)

    This release extends the functionality introduced in version 3.2.0 to preserve the original error. When the rejection reason instance of Error, the original error object will be used instead of constructing a new error.

    Source code(tar.gz)
    Source code(zip)
  • 3.3.0(Jun 29, 2016)

    🔥🚒 The version 3.2.0 release broke catch() on promises.

    // expected functionality
    doSomethingAsyncAndReject().catch(() => { 
      // called once 🙂
    });
    
    // version 3.2.0
    doSomethingAsyncAndReject().catch(() => { 
      // never called ☹️
    });
    

    This release fixes the functionality of catch and updates tests. Previously, an error in how async...await was used caused tests to pass even if the assertion failed. Tests now use done to ensure async tests complete with full confidence.

    Source code(tar.gz)
    Source code(zip)
  • 3.2.0(Jun 27, 2016)

    Instead of constructing a new promise and returning the new promise, the middleware returns the original promise. This change was made to avoid an anti-pattern and to ensure the original promise object methods are preserved, such as in the case where a library like Bluebird is used.

    Source code(tar.gz)
    Source code(zip)
  • 3.1.0(Jun 25, 2016)

    The rejected parameter for a promise is now an error object. This change is not breaking.

    // before
    Promise.reject('foo').catch(error => {
      console.log(error instanceof Error); // => false
    });
    
    // after
    Promise.reject('foo').catch(error => {
      console.log(error instanceof Error); // => true
    });
    
    // error object keys remain the same as 3.0.x
    Promise.reject('foo').catch(({ reason, action }) => {
      console.log(reason); // => 'foo'
    });
    
    Source code(tar.gz)
    Source code(zip)
  • 3.0.2(Jun 14, 2016)

  • 3.0.1(Jun 5, 2016)

  • 2.4.0(May 17, 2016)

    This is the first release under the @prev dist tag on npm

    breaking

    • removes the feature of resolving custom actions in favour of resolving thunks for providing the same functionality.
    • returns original promise from dispatch instead of a custom action

    notes if your original promise rejects, you can optionally catch it yourself from the caller of the action creator -- also if your promises have extra functionality (such as try or finally), this will be available from the caller.

    Source code(tar.gz)
    Source code(zip)
  • 3.0.0(Mar 31, 2016)

    This release introduces some major changes to the functionality of the middleware:

    First, the middleware returns a promise instead of the action.

    // before
    const foo = () => ({
      type: 'FOO',
      payload: {
        promise: Promise.resolve('foo')
      }
    });
    
    foo().action.promise.then(value => {
      console.log(value); // => 'foo'
    });
    
    // after
    const bar = () => ({
      type: 'BAR',
      payload: Promise.resolve('bar')
    });
    
    bar().then(({ value }) => {
      console.log(value); // => 'bar'
    });
    

    Second, a new promise is created so .then() and .catch() work as expected.

    // before
    const foo = () => ({
      type: 'FOO',
      payload: {
        promise: Promise.reject('foo')
      }
    });
    
    foo().action.promise.then(
      value => {
        console.log(value); // => 'foo'
      },
      reason => {
        // nothing happens
      }
    );
    
    // after
    const bar = () => ({
      type: 'BAR',
      payload: Promise.reject('bar')
    });
    
    bar().then(
      ({ value }) => {
        // ...
      },
      ({ reason }) => {
        console.log(reason); // => 'bar'
      }
    );
    
    const baz = () => ({
      type: 'BAZ',
      payload: new Promise((resolve, reject) => {
        throw 'baz'
      })
    });
    
    bar().catch(({ reason }) => {
      console.log(reason) // => 'baz'
    });
    

    Third, promises can be explicitly or implicitly in the action object.

    // before
    const foo = () => ({
      type: 'FOO',
      payload: {
        promise: Promise.resolve()
      }
    });
    
    // after, with implicit promise as the value of the 'payload' property
    const bar = () => ({
      type: 'BAR',
      payload: Promise.resolve()
    });
    

    Of course, if you prefer the explicit syntax, this still works. This syntax is also required for optimistic updates.

    // after, but with explicit 'promise' property and 'data' property
    const bar = () => ({
      type: 'BAZ',
      payload: {
        promise: Promise.resolve(),
        data: ...
      }
    });
    

    Fourth, thunks are no longer bound to the promise. If you are chaining actions with Redux Thunk, this is critical change.

    // before, with Redux Thunk
    const foo = () => ({
      type: 'FOO',
      payload: {
        promise: new Promise((resolve, reject) => {
          ...
        }).then(
          value => (action, dispatch) => {
            // handle fulfilled
            dispatch(someSuccessHandlerActionCreator());
          },
          reason => (action, dispatch) => {
            // handle rejected
            dispatch(someErrorHandlerActionCreator());
          }
        )
      }
    });
    
    // after, with Redux Thunk
    const bar = () => {
      return (dispatch, getState) => {
    
    
        return dispatch({
          type: 'FOO',
          payload: Promise.resolve('foo')
        }).then(
          ({ value, action }) => {
            console.log(value); // => 'foo'
            console.log(action.type); // => 'FOO_FULFILLED'
            dispatch(someSuccessHandlerActionCreator());
          },
          ({ reason, action }) => {
            // handle rejected
            dispatch(someErrorHandlerActionCreator());
          }
        );
      };
    };
    
    Source code(tar.gz)
    Source code(zip)
  • 2.2.4(Nov 29, 2015)

    This release binds the first argument of any function given to Promise.resolve to a partial action object so one can access the original meta and an appropriate type within their thunk.

    Source code(tar.gz)
    Source code(zip)
  • 2.2.3(Nov 29, 2015)

  • 2.2.2(Nov 26, 2015)

    With the previous release, dispatched actions are set through the entire stack of middleware.

    const actionCreator = () => ({
      type: 'EXAMPLE_TYPE',
      payload: {
        promise: Promise.resolve({
          type: 'RESOLVED_ACTION' 
          payload: ...
        })
       }
    });
    

    However, this middleware does not check to see if the resolved or rejected parameter is a function. This release adds a check for thunk /function before resolving or rejecting as payload.

    For example, now the following will also work:

    const actionCreator = () => ({
      type: 'EXAMPLE_TYPE',
      payload: {
        promise: Promise.resolve((dispatch, getState) => {
          dispatch({ type: 'RESOLVED_ACTION', payload: '' })
          dispatch(someActionCreatorThatMaybeUpdatesTheRoute())
          doSomethingNaughtyAfterDispatchingEverything(getState())
        })
       }
    });
    

    This is not a breaking change.

    Source code(tar.gz)
    Source code(zip)
  • 2.2.1(Nov 19, 2015)

    Instead of calling next() to dispatch rejected and fulfilled actions, the middleware now recalls dispatch() and dispatches entirely new actions. This is not a breaking change.

    Source code(tar.gz)
    Source code(zip)
  • 2.2.0(Nov 8, 2015)

    Breaking Changes :fire:

    • In the case that the promise resolves null, the middleware will dispatch an empty object instead of dispatching null.
    Source code(tar.gz)
    Source code(zip)
  • 2.0.0(Nov 3, 2015)

    Adds

    • Custom type suffixes
      • promiseMiddleware is now a function that accepts options and returns the middleware to apply
      • Action.type now expects a single type value instead of an array
    • Minor bug fixes

    Breaking Changes :fire:

    The middleware must now be initiliazed like this:

    composeStoreWithMiddleware = applyMiddleware(
      promiseMiddleware()
    )(createStore);
    

    Previously it was:

    composeStoreWithMiddleware = applyMiddleware(
      promiseMiddleware
    )(createStore);
    
    Source code(tar.gz)
    Source code(zip)
Owner
Patrick Burtchaell (he/him)
Product designer @facebook, working on E2EE and privacy for Messenger and Instagram DMs
Patrick Burtchaell (he/him)
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