title: npm run dev fails : ValidationError: Invalid options object
body: <p>Currently learning Vue js and express js through some tutorials, I am still newbie regarding these technologies. </p>
  
  <p>Anyway following the tutorials I am building a small project in which I have a folder "Client" that contains the frontend side of the project and another folder "Server" that contains the backend.</p>
  
  <p>Just before pushing commits to Github, everything was fine, but once I did Github signals some vulnerabilities and after fixing them npm run dev doesn't work anymore.</p>
  
  <p>tried multiples solutions but nothing worked, reinstalled suspicious modules, reinstalled node modules after running <em>npm cache clean --force</em></p>
  
  <p>This is the error I got  </p>
  
  <pre><code>   npm run dev
  
  
  &gt; client@1.0.0 dev D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client
  &gt; webpack-dev-server --inline --progress --config build/webpack.dev.conf.js
  
  D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\copy-webpack-plugin\node_modules\schema-utils\dist\validate.js:88
      throw new _ValidationError.default(errors, schema, configuration);
      ^
  
  ValidationError: Invalid options object. Copy Plugin has been initialized using an options object that does not match the API schema.
   - options[0] misses the property 'patterns'. Should be:
     [non-empty string | object { from, to?, context?, globOptions?, toType?, force?, flatten?, transform?, cacheTransform?, transformPath?, noErrorOnMissing? }, ...] (should not have fewer than 1 item)
      at validate (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\copy-webpack-plugin\node_modules\schema-utils\dist\validate.js:88:11)  
      at new CopyPlugin (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\copy-webpack-plugin\dist\index.js:24:30)
      at Object.&lt;anonymous&gt; (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\build\webpack.dev.conf.js:61:5)
      at Module._compile (internal/modules/cjs/loader.js:1133:30)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
      at Module.load (internal/modules/cjs/loader.js:977:32)
      at Function.Module._load (internal/modules/cjs/loader.js:877:14)
      at Module.require (internal/modules/cjs/loader.js:1019:19)
      at require (internal/modules/cjs/helpers.js:77:18)
      at WEBPACK_OPTIONS (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\webpack-cli\bin\utils\convert-argv.js:114:13)
      at requireConfig (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\webpack-cli\bin\utils\convert-argv.js:116:6)
      at D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\webpack-cli\bin\utils\convert-argv.js:123:17
      at Array.forEach (&lt;anonymous&gt;)
      at module.exports (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\webpack-cli\bin\utils\convert-argv.js:121:15)
      at Object.&lt;anonymous&gt; (D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client\node_modules\webpack-dev-server\bin\webpack-dev-server.js:84:40)
      at Module._compile (internal/modules/cjs/loader.js:1133:30) {
    errors: [
      {
        keyword: 'required',
        dataPath: '[0]',
        schemaPath: '#/required',
        params: [Object],
        message: "should have required property 'patterns'",
        schema: [Object],
        parentSchema: [Object],
        data: [Object],
        children: [Array]
      }
    ],
    schema: {
      definitions: { ObjectPattern: [Object], StringPattern: [Object] },
      type: 'object',
      additionalProperties: false,
      properties: { patterns: [Object], options: [Object] },
      required: [ 'patterns' ]
    },
    headerName: 'Copy Plugin',
    baseDataPath: 'options',
    postFormatter: null
  }
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! client@1.0.0 dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the client@1.0.0 dev script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:\Users\iheb\AppData\Roaming\npm-cache\_logs\2020-05-21T13_56_52_099Z-debug.log
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! client@1.0.0 start: `npm run dev`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the client@1.0.0 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:\Users\iheb\AppData\Roaming\npm-cache\_logs\2020-05-21T13_56_52_148Z-debug.log
  </code></pre>
  
  <p>This is the log file :</p>
  
  <pre><code>0 info it worked if it ends with ok
  1 verbose cli [
  1 verbose cli   'C:\\Program Files\\nodejs\\node.exe',
  1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
  1 verbose cli   'run',
  1 verbose cli   'build:server'
  1 verbose cli ]
  2 info using npm@6.14.4
  3 info using node@v12.16.3
  4 verbose stack Error: missing script: build:server
  4 verbose stack     at run (C:\Program Files\nodejs\node_modules\npm\lib\run-script.js:155:19)
  4 verbose stack     at C:\Program Files\nodejs\node_modules\npm\lib\run-script.js:63:5
  4 verbose stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:116:5
  4 verbose stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:436:5
  4 verbose stack     at checkBinReferences_ (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:391:45)
  4 verbose stack     at final (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:434:3)
  4 verbose stack     at then (C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:161:5)
  4 verbose stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:281:12
  4 verbose stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\graceful-fs\graceful-fs.js:115:16
  4 verbose stack     at FSReqCallback.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:63:3)
  5 verbose cwd D:\projects\Fullstack web apps\VueJs ExpressJs\tab-tracker\Client
  6 verbose Windows_NT 10.0.18362
  7 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "build:server"
  8 verbose node v12.16.3
  9 verbose npm  v6.14.4
  10 error missing script: build:server
  11 verbose exit [ 1, true ]
  </code></pre>
  
  <p>Running <em>npm audit</em> gives the following : </p>
  
  <blockquote>
  <pre><code>    Moderate        Cross-Site Scripting                                          
  
    Package         serialize-javascript                                          
  
    Patched in      &gt;=2.1.1                                                       
  
    Dependency of   uglifyjs-webpack-plugin [dev]                                 
  
    Path            uglifyjs-webpack-plugin &gt; serialize-javascript                
  
    More info       https://npmjs.com/advisories/1426
  </code></pre>
  </blockquote>
  
  <p>Related dependencies </p>
  
  <blockquote>
    <p>"webpack": "^4.43.0",</p>
  
  <pre><code>"webpack-bundle-analyzer": "^3.3.2",
  
  "webpack-cli": "^3.3.11",
  
  "webpack-dev-server": "^3.1.11",
  </code></pre>
  </blockquote>
  
  <p>I hope I provided everything for you guys, if not I will immediately provide anything to help clarify my problem, as I said I'm a newbie to web development. </p>
  
  <p><strong>UPDATE:</strong> I've trying to figure out the reason behind such error, the problem occurs after updating <strong>webpack-dev-server</strong>
  Version that works :</p>
  
  <blockquote>
    <p>"webpack-dev-server": "^2.9.1"</p>
  </blockquote>
  
  <p>Version with errors : </p>
  
  <blockquote>
    <p>"webpack-dev-server": "^3.11.0"</p>
  </blockquote>
  
  <p>Is it okay if I ignore vulnerabilities found? Because trying to fix them causes this error.</p>
  
  <p>Thanks</p>