Defining the type of the createAction() function in TypeScript within the context of Redux Toolkit

Lately, I have been delving into the redux-toolkit library but I am struggling with understanding the type declaration of the createAction function as demonstrated below.


The createAction function returns a PayloadActionCreator which includes a generic of 

<ReturnType<PA>['payload'], T, PA>
. Could someone explain what is meant by ReturnType<PA>['payload']?

export declare function createAction<PA extends PrepareAction<any>, T extends string = string>(type: T, prepareAction: PA): PayloadActionCreator<ReturnType<PA>['payload'], T, PA>
typescriptgenericsreduxredux-toolkit

Answer №1

ReturnType<PA>['payload'] represents the payload attribute of the object that is given back by the prepare function - following the format specified for the prepare notation.

Nevertheless, you don't need to worry about this too much. Typically, you would use it like so: 

const actionCreator = createAction<PayloadType>('some/action/type')
.

An alternate way to write this is using the prepare notation, as shown here: 

createAction('some/action/type', (payload: string) => ({ payload, meta: {something: "foo"}})
.

For more details and examples in TypeScript, please visit the API documentation, which covers most scenarios. It's recommended not to overcomplicate the typings beyond what's necessary. (And yes, there aren't many types to handle, which is intentional ;) )

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

error TS2304: The term 'MediaRecorder' is not recognized

How can I add audio recording capability to my Angular application using media recorder? Unfortunately, I am encountering the following error: Error TS2304: 'MediaRecorder' cannot be found If anyone knows a solution for this issue, your help w ...

javascriptangulartypescriptmediaaudio-recording

"Every time you run mat sort, it works flawlessly once before encountering an

I am having an issue with a dynamic mat table that includes sorting functionality. dataSource: MatTableDataSource<MemberList>; @Output() walkthroughData: EventEmitter<number> = new EventEmitter(); @ViewChild(MatSort, { static: true }) sort ...

angulartypescriptsortingangular-materialangular-material2

Using create-react-app with TypeScript for server-side rendering

My current project is built with create-react-app using typescript (tsx files). I'm now interested in implementing SSR for the project, but I'm not exactly sure where to begin. In the past, I've successfully implemented SSR with typescript ...

reactjstypescriptexpresscreate-react-appserver-side-rendering

"The process of logging in to Facebook on Ionic app speeds up by bypassing

I'm facing a minor issue with Facebook login in Ionic. I've tried using Async - Await and various other methods to make it wait for the response, but nothing seems to work. The login function is working fine, but it's not pausing for me to p ...

facebookangulartypescriptionic2ionic3

Comparing ngrx's createSelector method with Observable.combineLatest

Exploring the custom selectors from ngrx has left me in awe of their capabilities. Considering the example of using books for selectedUser, I find myself questioning the need for a custom selector like: export const selectVisibleBooks = createSelector(se ...

angularreduxobservablengrxcombinelatest

Get started with adding a Typescript callback function to the Facebook Login Button

I am in the process of implementing Facebook login into my Angular7 application using Typescript. Although I have successfully integrated Facebook's Login Button plugin for logging in, I am facing issues with providing a callback method to the button& ...

javascriptangulartypescriptfacebook-javascript-sdk

Issue arises when trying to implement sidebar navigation in Angular with Materialize CSS

Just starting my Angular journey and running into some trouble trying to set up a practical and responsive menu using SidebarNav and Dropdown. I used CLI to install and configure angular2-materialize and materialize-css. To create the menu, I made a comp ...

javascriptangulartypescriptmaterialize

The presence of a method is triggering an Error TS2741 message stating that the property is missing in type

Here is a simplified code snippet that highlights the issue I am facing: class Test { prop1 : boolean prop2 : string method() { } static create(prop1 : boolean, prop2 : string) : Test { let item : Test = { prop1: prop1, prop2: pro ...

angulartypescriptangular8

Moving SVG Module

My goal is to create a custom component that can dynamically load and display the content of an SVG file in its template. So far, I have attempted the following approach: icon.component.ts ... @Component({ selector: 'app-icon', templa ...

angulartypescriptsvgionic2

Adjusting the IntelliSense Functionality in Monaco Editor

Currently, I am testing out the CompletionItemProvider feature for my project. I have implemented two separate CompletionItemProviders. One is set to trigger when any alphabet letter is typed and the other triggers when the user enters a single quote chara ...

typescriptmonaco-editor

Having trouble finding the "make:migration" command in Adonis 5 - any suggestions?

After reviewing the introductory documentation for Adonis Js5, I attempted to create a new API server. However, when compiling the code using "node ace serve --watch" or "node ace build --watch", I kept receiving an error stating "make:migration command no ...

typescriptadonis.jsadonisjs-ace

Discover the power of TypeScript's dynamic type inference in functions

Below is a function that selects a random item from an array: const randomFromArray = (array: unknown[]) => { return array[randomNumberFromRange(0, array.length - 1)]; }; My query pertains to dynamically typing this input instead of resorting to u ...

typescript

Leveraging the power of react-hook-form in combination with the latest version 6 of @mui

When using MUI v5 date pickers, I utilized the following method to register the input with react-hook-form: <DatePicker ...date picker props renderInput={(params) => { return ( <TextField {...params} ...

reactjstypescriptmaterial-uidatepickerreact-hook-form

Error message shows explicit Typescript type instead of using generic type name

I am looking to use a more explicit name such as userId instead of the type number in my error message for error types. export const primaryKey: PrimaryKey = `CONSUMPTION#123a4`; // The error 'Type ""CONSUMPTION#123a4"" is not assignable to ...

typescripttypes

I wonder what the response would be to this particular inquiry

I recently had an angular interview and encountered this question. The interviewer inquired about the meaning of the following code snippet in Angular: code; <app-main [type]="text"></app-main> ...

javascriptangulartypescriptsingle-page-applicationangular8

What data structure is used to store HTML elements in TypeScript?

Currently, I am dealing with a typescript variable that holds the outcome of a query on the DOM: let games = document.getElementsByTagname("game"); My uncertainty lies in identifying the appropriate type for the resulting array. Should I expect an array ...

typestypescript

Managing a scenario with a union type where the value can be retrieved from one of two different functions

There are two similar methods that I want to refactor to eliminate redundant code. The first function returns a single element, while the second function returns multiple elements: //returns a single element const getByDataTest = ( container: HTMLElement ...

typescript

Creating a personalized connect function in Typescript for react-redux applications

Currently, I am in the process of migrating a large and intricate application to Typescript. One specific challenge we are facing is our reliance on createProvider and the storeKey option for linking our containers to the store. With over 100 containers in ...

reactjstypescriptreduxreact-redux

Discovering the process of iterating through values from multiple arrays of objects and applying them to a new response in Angular 8

Received the following data from an API response: const apiResponse = { "factoryId": "A_0421", "loss": [ { "lossType": "Planned Stoppage Time", "duration": ...

javascriptangulartypescriptangular8

What is the method to invoke a function within another function in Angular 9?

Illustration ` function1(){ ------- main function execution function2(){ ------child function execution } } ` I must invoke function2 in TypeScript ...

javascriptangulartypescriptangular-servicesnested-function