title: Starting vue js dev server gives eror: .plugins[0] may only be a two-tuple or three-tuple
body: <p>I am using Vue CLI version 3 to run a Vue application inside a Docker container. To start the development server, I run:</p>
  
  <pre><code>https://cli.vuejs.org/guide/cli-service.html
  </code></pre>
  
  <p>This gives the following error:</p>
  
  <pre><code> ERROR  Failed to compile with 1 errors                                                                                                                                                          17:05:14
  
   error  in ./app/main.js
  
  Module build failed (from ./node_modules/@vue/cli-plugin-babel/node_modules/babel-loader/lib/index.js):
  Error: .plugins[0] may only be a two-tuple or three-tuple
      at assertPluginItem (/home/src/node_modules/@babel/core/lib/config/validation/option-assertions.js:235:13)
      at arr.forEach (/home/src/node_modules/@babel/core/lib/config/validation/option-assertions.js:222:30)
      at Array.forEach (&lt;anonymous&gt;)
      at assertPluginList (/home/src/node_modules/@babel/core/lib/config/validation/option-assertions.js:222:9)
      at Object.keys.forEach.key (/home/src/node_modules/@babel/core/lib/config/validation/options.js:107:5)
      at Array.forEach (&lt;anonymous&gt;)
      at validateNested (/home/src/node_modules/@babel/core/lib/config/validation/options.js:83:21)
      at validate (/home/src/node_modules/@babel/core/lib/config/validation/options.js:74:10)
      at file (/home/src/node_modules/@babel/core/lib/config/config-chain.js:174:34)
      at cachedFunction (/home/src/node_modules/@babel/core/lib/config/caching.js:33:19)
      at buildRootChain (/home/src/node_modules/@babel/core/lib/config/config-chain.js:120:36)
      at loadPrivatePartialConfig (/home/src/node_modules/@babel/core/lib/config/partial.js:85:55)
      at Object.loadPartialConfig (/home/src/node_modules/@babel/core/lib/config/partial.js:110:18)
      at Object.&lt;anonymous&gt; (/home/src/node_modules/@vue/cli-plugin-babel/node_modules/babel-loader/lib/index.js:140:26)
      at Generator.next (&lt;anonymous&gt;)
      at asyncGeneratorStep (/home/src/node_modules/@vue/cli-plugin-babel/node_modules/babel-loader/lib/index.js:3:103)
  
   @ multi (webpack)-dev-server/client/index.js ./node_modules/@vue/cli-service/node_modules/webpack/hot/dev-server.js ./app/main.js
  </code></pre>
  
  <p>I suspect that the offending code is the following, in my <code>.babelrc</code> file:</p>
  
  <pre><code>  "plugins": [
      ["transform-runtime", "transform-vue-jsx", "transform-regenerator", {
        "polyfill": false,
        "regenerator": true
      }]
  </code></pre>
  
  <p>Could someone suggest how I could go about resolving this? Thanks!</p>