Tag Archives: javascript

core-js/modules/es.error.cause.js [How to Solve]

Reason: the installed version of core-js is too old and needs to be replaced with a newer version.

1 Delete original version

 npm rm -rf node_modules  

2. install the latest version

npm install [email protected]

you cannot directly install a new version. You must first delete the original version dependency, and then install a new version to avoid errors!

[Solved] vue error: error Component name “School“ should always be multi-word vue/multi-word-component-names

Error details:

error Component name “School” should always be multi-word vue/multi-word-component-names

Cause: when checking the syntax, the non-standard naming is regarded as a syntax error.

Solution: turn off syntax checking

Add the following codes in vue.config.js:

const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
  transpileDependencies: true,
  lintOnSave:false /*Turn off syntax checking*/

[Solved] Vue3 Error: error Delete `··` prettier/prettier

vue3 project error: error Delete `··` prettier/prettier


npm  run  lint --fix

It depends on what tool is used. If you use yarn or pnpm, you can replace it

If present

Open package.json file, and view the configuration

For example, the configuration of my project is as follows

The command to run is:

npm run lint:eslint --fix 

Then restart the project


Found that error Delete `——–␍⏎` prettier/prettier is too much when using webstorm, and every time I modify the code, this error will appear, which is troublesome to operate. So choose to close the Prettier code specification directly
Just configure it in the rules in eslintrc.js

'prettier/prettier': 'off'

[Solved] Vue-cli Error: Module not found: Error: Can‘t resolve ‘vue-router ‘

Error Messages:

Compiled with problems:X
ERROR in ./src/router/index.js 2:0-23
Module not found: Error: Can’t resolve ‘vue ‘ in ‘D:\F\XX\project-SPH\app\src\router’

ERROR in ./src/router/index.js 3:0-36
Module not found: Error: Can’t resolve ‘vue-router ‘ in ‘D:\F\XX\project-SPH\app\src\router’

ERROR in ./src/router/index.js 8:0-36
Module not found: Error: [CaseSensitivePathsPlugin] `D:\F\XX\project-SPH\app\src\pages\search\index.vue` does not match the corresponding path on disk `Search`.

The incorrect index.js code at this point is as follows:

// Where to configure routing
import Vue from 'vue ';
import VueRouter from 'vue-router ';//Using the plug-in
//Introduction of routing components
import Home from '@/pages/Home'
import Search from '@/pages/search'
import Login from '@/pages/Login'
import Register from '@/pages/Register'
//configure routing
export default new VueRouter({
//configure routing
        path : "/home",
        path: " /search",
        path: " /login",
        path: " /register",


At first, it was because Vue-router could not be installed. I suspected that Vue-router was not installed properly.

After an afternoon of Googling to find the cause, I decided to look at the code myself to see what the error meant. There are a total of 3 code: all point to the index.js file.

The first place: pointing to Search, I looked at the reference Search place, found written in lower case.

The second place: the reference to vue and vue-router, after careful observation, I found that I wrote an extra space.

After correction, it can be run again without any error.

[Solved] React Startup Error at the First time :SyntaxError: Unexpected token

[react] prompt syntaxerror: unexpected token

1. background

Use react scaffold to build the project

  • Install globally: npm i -g create-react-app
  • create-react-app hello-react
  • Go to the project folder: cd hello-react
  • Start the project: npm start

When executing npm start, an error occurred, please check the node version.


2. problem-solving

  • The investigation found that it was caused by the node version.
  • execute node -v ;

  • react-app requires node version greater than 14
  • execute nvm use 14;

  • Just restart.

[Solved] express-jwt Error: Error: jwt is not a function

Problem Description:

Express JWT is not a function

Cause analysis:

The express JWT I installed is version 7.7.5, and the usage has changed.


Check the official documents for the latest usage


1. import

var { expressjwt:jwt } = require("express-jwt")

2. registration

secret: 'shhhhhhared-secret', algorithms: ['HS256'] 
}).unless({ path:[/^\/api\//] }))

.unless ({specify the path without access permission with regular})

Or another method, directly add the unique protected path address as a parameter:

app.use("/api", jwt({ 
secret: "shhhhhhared-secret", algorithms: ["HS256"] 

3. user data

Once parsed successfully, the user data contained in the Token will be automatically mounted on req.auth

// This is an API interface with permissions
app.get('/admin/getinfo', function (req, res) {
  // TODO_05: use req.auth to get the user information and use the data property to send the user information to the client
    status: 200,
    message: 'User information retrieved successfully! ,
    data: req.auth// the user information to be sent to the client


[Solved] Vite Error: Failed to load module script: Expected a JavaScript module script but the server…

Error message

Use the white screen of the web page packaged by vite, and the console reports an error.

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of “text/plain”. Strict MIME type checking is enforced for module scripts per HTML spec.


MIME type errors are generally a problem with native windows development. I encountered this after opening it with Python’s built-in http.server on Windows.


Deploy the packaged files in a formal server environment (such as nginx and Apache)

[Solved] Vue Project Modify Page Error: CALL_AND_RETRY_LAST Allocation failed – JavaScript heap out of memory

vue项目 CALL_AND_RETRY_LAST Allocation failed – JavaScript heap out of memory 修改页面后自动运行报错退出

Vue project: as soon as the page is modified, the automatic operation will report an error and exit (fat error: call_and_retry_last allocation failed – Javascript heap out of memory)

step 1: NPM install -g increase memory limit
step 2: increase memory limit

Step 3: Run the project normally, if an error is reported (“node –max-old-space-size=10240″‘ is not an internal or external command, and is not a runnable program)

step 4: Look in the .bin file under node_module and replace “%_prog%” with %_prog% (without the quotes).

step 5: Run the Project normally.

[Solved] VUE Error: listen EADDRNOTAVAIL: address not available

VUE Error: listen EADDRNOTAVAIL: address not available

vue Project npm run dev Error: Error: listen EADDRNOTAVAIL: address not available …

Cause: the configured IP address is incorrect.

Solution: open the config folder and find index.js file, modify the value of host to localhost , as shown in the following figure

[Solved] vue Project Error: react lazy eslint error Parsing error: Unexpected token import

vue Project Error: react lazy eslint error Parsing error: Unexpected token import

1. You need to install the extension component eslint, and then click settings in settings – extension search – eslintrc and add this line (“parser”: “Babel-eslint”) in settings.json, save the code, and then run the project