title: Jest encountered an unexpected token because trying to import a file which Jest cannot parse
body: <p>PS E:\react\Code\UI> yarn test
  yarn run v1.17.3
  $ jest
   FAIL  src/App.test.js
    ● Test suite failed to run</p>
  
  <pre><code>Jest encountered an unexpected token
  
  This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
  
  By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
  
  Here's what you can do:
   • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
   • If you need a custom transformation specify a "transform" option in your config.
   • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.
  
  You'll find more details and examples of these config options in the docs:
  https://jestjs.io/docs/en/configuration.html
  
  Details:
  
  E:\react\Code\UI\src\mainpage.css:1
  ({"Object.&lt;anonymous&gt;":function(module,exports,require,__dirname,__filename,global,jest){body{font-size:12px;font-family:arial,sans-serif;background-size:200% 100%!important;height:100vh}
                                                                                               ^
  
  SyntaxError: Unexpected token {
  
    1 | import React, { Component } from "react";
  &gt; 2 | import "../mainpage.css";
      | ^
    3 | import { connect } from "react-redux";
    4 | import propTypes from "prop-types";
    5 | import { fetchPost } from "../redux/action/postaction";
  
    at ScriptTransformer._transformAndBuildScript (E:\react../../../../Code/UI/node_modules/@jest/transform/build/ScriptTransformer.js:471:17)
    at ScriptTransformer.transform (E:\react../../../../Code/UI/node_modules/@jest/transform/build/ScriptTransformer.js:513:25)
    at Object.&lt;anonymous&gt; (E:\react../../../../Code/UI/src/page/Header.js:2:1)
  </code></pre>
  
  <p>Test Suites: 1 failed, 1 total
  Tests:       0 total
  Snapshots:   0 total
  Time:        3.592s
  Ran all test suites.
  error Command failed with exit code 1.
  info Visit <a href="https://yarnpkg.com/en/docs/cli/run" rel="nofollow noreferrer">https://yarnpkg.com/en/docs/cli/run</a> for documentation about this command.</p>