React JS Error is not defined react jsx-no-undef

Question

I m developing a map functionality using ReactJS  My app js file is   import React    Component   from  react   import    Map   class App extends Component      render          return             lt div className  App  gt               lt Map  gt            lt  div gt                 export default App    The error is     src App js Line 8    Map  is not defined  react jsx-no-undef  Search for the keywords to learn more about each error    How can I solve this problem

User · Answer

The Syntax for the importing any module is   import      from  module     or   import module-name from  module     Before error  cakeContainer with small  c       After Fix

User · Answer

its very similar with nodejs  var User  require    Users      in this case its React   import User from    User    right now you can use  return          lt Users gt  lt  Users gt

User · Answer

should write like this -- gt  import Map from    map    look in this Map should have first later is capital   important note  inset the single  just mention your file location correctly

User · Answer

This happens to me occasionally  usually it s just a simple oversight  Just pay attention to details  simple typos  etc  For example when copy pasting import statements  like this

User · Answer

you should do import Map from    Map  React is just telling you it doesn t know where variable you are importing is

User · Answer

Try using  import Map from    Map     When you use import  module  it will just run the module as a script  This is useful when you are trying to introduce side-effects into global namespace  e  g  polyfill newer features for older unsupported browsers   ES6 modules are allowed to define default exports and regular exports  When you use the syntax import defaultExport from  module  it will import the default export of that module with alias defaultExport   For further reading on ES6 import - https   developer mozilla org en-US docs Web JavaScript Reference Statements import

User · Answer

You have to tell it which component you want to import by explicitly giving the class name  in your case it s Map  import Map from    Map    class App extends Component        your code here

User · Answer

Here you have not specified class name to be imported from Map js  file  If Map is class exportable class name exist in the Map js file  your code should be as follow   import React    Component   from  react   import Map from     Map   class App extends Component      render          return             lt div className  App  gt               lt Map  gt            lt  div gt                 export default App

User · Answer

Strangely enough  the reason for my failure was about the CamelCase that I was applying to the component name  MyComponent was giving me this error but then I renamed it to Mycomponent and voila  it worked

User · Answer

in map jsx or map js file  if you exporting as default like  export default MapComponent   then you can import it like import MapComponent from    map   but if you do not export it as default like this one here export const MapComponent        gt       whatever    you need to import in inside curly braces like import   MapComponent   from    map    Here we get into your problem  --- sometimes in our project  most of the time that I work with react  we need to import our styles in our javascript files to use it  in such cases we can use that syntax because in such cases  we have a blunder like webpack that that takes care of it  then later on  when we want to bundle our app  webpack is going to extract our CSS files and put it in a separate  for example  app css file  in those situations  we can use such syntax to import our CSS files into our javascript modules  like below  import    css app css   if you are using sass all you need to do is just use sass loader with webpack

[javascript] React JS Error: is not defined react/jsx-no-undef

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