Exploring Real-Time Typescript Validation in Next.JS

Checking for TypeScript errors in Next.JS can only be done with npm run build (or yarn build).

Unfortunately, running npm run dev won't display TypeScript errors, which is quite inconvenient as it would be better to have them visible in the Terminal during development.

Is there a way to configure npm run dev to show TS errors?

Just a heads up - I strongly dislike relying on my IDE for handling TS errors. It's just a personal preference of mine. I find it more convenient to view them in the terminal alongside other error messages.

typescriptnext.js

Answer №1

If you are using TS4+ in your project, you can implement the following setup:

// package.json

{
  "scripts": {
    "dev": "next dev",
    "dev:ts": "yarn dev & yarn ts:watch", // <-- alternatively use concurrently here
                                          // npmjs.com/package/concurrently
    "ts": "tsc --noEmit --incremental",
    "ts:watch": "yarn ts --watch"
  },

  // ...
}

You can also customize webpack configuration like so:

// next.config.js

module.exports = {
  webpack(config, { dev }) {
    if (dev) {
      const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
      config.plugins.push(new ForkTsCheckerWebpackPlugin());
    }
    return config;
  },
};

To follow updates and contribute to the feature request, visit this link.

Answer №3

I encountered a similar issue during my project. It seems that I initially began the project with an .eslintrc file without specifying to use it with TypeScript. As a result, when I later incorporated TypeScript into the project, there were no errors detected.

To resolve this problem, here is what I did:

  1. Deleted the .eslistrc file
  2. Ran npx eslint --init, ensuring that I selected options for using Typescript and checking syntax, identifying problems, and enforcing code style
  3. Executed npm run dev and verified that everything was functioning correctly

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

script code to limit selection of dates within a predefined range

I'm seeking assistance to limit my customers from selecting a date beyond 10 days in advance. Although I previously had a code that functioned properly when there were more than 10 days left in the current month, it is now ineffective. This is becaus ...

htmltypescriptgoogle-apps-scriptdatepicker

What is the most effective way to loop and render elements within JSX?

Trying to achieve this functionality: import React from 'react'; export default class HelloWorld extends React.Component { public render(): JSX.Element { let elements = {"0": "aaaaa"}; return ( ...

javascriptreactjstypescript

Switch statements in TypeScript may not function properly with type guards when assigning an object to a variable

I'm puzzled as to why the type guard is not working in the example provided below... Considering the following interfaces: interface ParamA { name: 'A'; aaa: boolean; } interface ParamB { name: 'B'; bbb: number; ...

typescript

Determining whether a user is accessing a page through a URL or by navigating within the app using Next.js

I'm facing a small issue that needs to be resolved. Our application has a specific functionality requirement: When a user attempts to access the route / via URL, they should be redirected to /abc. However, if the user tries to access the rout ...

next.js

Unable to find a solution for the dependency issue with google-maps-react

I recently attempted to clone a React project from GitHub for the first time. Here are the steps I followed: $ git clone <link> After cloning, I ran: npm install Unfortunately, I encountered an error related to google-maps-react. $ npm install --s ...

node.jsreactjsnpminstallationnext.js

Obtain the count of unique key-value pairs represented in an object

I received this response from the server: https://i.stack.imgur.com/TvpTP.png My goal is to obtain the unique key along with its occurrence count in the following format: 0:{"name":"physics 1","count":2} 1:{"name":"chem 1","count":6} I have already rev ...

javascriptangulartypescript

Typescript library available as a private npm dependency

I have developed a Typescript library that I bundle as an npm module. During the development of my frontend application, I easily integrated this library using yarn link. As I set up GitLab CI for other developers to work on the frontend application, I am ...

gittypescriptnpmgitlab-ciyarnpkg

I am facing an issue with my interface - the variable designed to store boolean values

Something unusual happened with Typescript - I assigned a string value to a boolean variable, but no error was generated. I purposely triggered an error in order to observe how Typescript would react, only to find that it did not produce the expected erro ...

angulartypescript

PhpStorm alerts users to potential issues with Object methods within Vue components when TypeScript is being utilized

When building Vue components with TypeScript (using the lang="ts" attribute in the script tag), there is a warning in PhpStorm (version 2021.2.2) that flags any methods from the native JavaScript Object as "Unresolved function or method". For exa ...

javascripttypescriptvue.jsphpstormwebstorm

Exploring Nextjs with server-side rendering and fetching data from

When utilizing the getServerSideProps function in Next.js to make a fetch request to my API, I encountered an issue where the origin header was coming back as undefined. This seems to be specific to requests made from the server in Next.js, as I am able ...

javascriptnode.jsreactjsnext.js

Accessing PDF content in a Next.js 13 API route handler leads to a 404 error

After following a tutorial on YouTube (link here) about uploading a PDF file to an Express server and extracting its text content, I encountered an issue. My main concern is extracting the text from the PDF rather than displaying it. Everything works smo ...

pdfnext.jspdfparser

Steps for showing a component (popup modal) just one time with React hooks

Is there a way to implement a popup modal that only appears once using hooks and localStorage? The modal should already appear upon page load. const [showModal, setShowModal] = useState<boolean>(true) return( <ModalIsContractor ...

reactjstypescriptreact-hooksnext.js

Is it advisable to implement next/link (client-side transitions with prefetching) for pages containing dynamic content?

Discover how the next/link component can enhance client-side transitions and link prefetching, although it may not be suitable for every scenario. https://i.sstatic.net/fMeLC.png https://i.sstatic.net/ZzG0c.png An issue I encountered involves pages like ...

next.jslink-prefetchnext-link

Troubleshooting Next.js 14 JWT Session Error in Conjunction with Next Auth - addressing a type

Recently, I delved into working with Next.js 14 and Next Auth 5 beta. However, every time I attempt to log in, I encounter the following error: [auth][error][JWTSessionError] [auth][cause]: TypeError: Cannot read properties of undefined (reading 'user ...

typescriptnext.jsjwtnext-authnext.js14

Mastering the proper implementation of the factory method in TypeScript

Trying to articulate this question is proving to be a challenge, but I'll give it my best shot. In Sharepoint, a default ListItem comes with properties like id, title, createdby, createddate, modifiedby, and modifieddate. Custom lists can have addit ...

reactjstypescriptdesign-patternssharepoint

Retrieve an array containing objects with a subset of their properties. Typescript

Consider the array 'radicados' below: this.radicados = [{ id:0, asunto:'Facturas ADPRO Propias', consecutivo:'FAC-AB-00046', documentos: [{id:1, descripcion:'documento1.pdf', esAnexo:false, r ...

arraystypescript

operating efficiently even when producing an incorrect output type

Exploring Typescript for the first time on Codepen.io has left me puzzled. I'm unsure why, despite defining the function signature and return type with an interface, I am able to return a different type without encountering any errors. Is there somet ...

typescript

How can I fix the ReferenceError that says ToolBar is not defined?

My journey with a new Next.js project began around three days ago. After updating everything, I proceeded to include the following dependencies: yarn add @material-ui/core yarn add @mui/icons-material yarn add @mui/material This is the code snippet that r ...

reactjsnext.js

Stretching the Mantine Accordion Section

The Mantine accordion requires that its content be of type Accordion.Item, as indicated in the documentation for the children props. This means that even functions returning AccordionItem will not be recognized. Therefore, only AccordionItem(s) created in ...

javascriptreactjstypescriptmantine

Error 404 occurs when a hard refresh is attempted on a page in Next.js

Every time I build my nextJs application on the server if I refresh the home page or other pages multiple times, it gives a 404 error Despite adding the following code to package.json, the error persists: module.exports = { trailingSlash: true } The a ...

reactjsnext.jsstatic-site-generation