dom is not defined error after transforming jsx to js

Question

I created a jsx file as below

  /** @jsx dom */
(function(){
'use strict';

define([
        'jquery',
        'react',
        'react-dom'
    ],

    function($, React, ReactDOM){

        var AppView = React.createClass({
            render: function() {
                return <div>Hello World</div>;
            }
        });

        ReactDOM.render(<AppView />, document.getElementById('dsl-application'));

    });
})();

And transformed the jsx to js using below command

babel --watch src --out-dir bundle --preset react

And the out put file is like below

(function () {
'use strict';

define(['jquery', 'react', 'react-dom'], function ($, React, ReactDOM) {

    var AppView = React.createClass({
        displayName: 'AppView',

        render: function () {
            return dom(
                'div',
                null,
                'Hello World'
            );
        }
    });


    ReactDOM.render(dom(AppView, null), document.getElementById('dsl-application'));
});
})();

The problem is I got Uncaught ReferenceError: dom is not defined when I run the js file in browser. dom is added after transformation. Any clue how to fix this?

Answer 1

Run into this same issue with a basic React app.

Turned out that the culprit was in my webpack.config.js. I had:

plugins: [ 
    ["transform-react-jsx", {
        "pragma": "dom" 
    }]
]

babel's default pragma is React.createElement (https://babeljs.io/docs/plugins/transform-react-jsx/).

The truth is that I had no reason for this option, I had just copy/pasted from the link above.

From the docs, I should have imported the 'dom' module that I had specified and made sure I had babel-plugin-jsx-pragmatic installed.

The docs for this plugin are here https://www.npmjs.com/package/babel-plugin-jsx-pragmatic and explain a little bit about pragmas.

I fixed this issue by simply removing the 'pragma' option so I could just use the default one ( attached a part of my webpack.config.js to provide more context): -- I am using webpack 2.6.1

...
module: {
    rules: [{
      //a regexp that tells webpack to use the following loaders on all
      //.js and .jsx files
      test: /\.js$/,
      loader: 'babel-loader',
      options: {
        babelrc: false,
        presets: ["es2016", "react", "stage-0"],
        plugins: [
          ["transform-react-jsx"]
        ]
      },
      //we definitely don't want babel to transpile all the files in
      //node_modules. That would take a long time.
      exclude: /node_modules/
    },

...