How to use the import directive in a browser?

A

Alesha2018-11-29 13:12:23

JavaScript

Alesha, 2018-11-29 13:12:23

There is just an example in which I use React:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Add React in One Minute</title>
  </head>
  <body>

    <h2>Add React in One Minute</h2>
    <p>This page demonstrates using React with no build tooling.</p>
    <p>React is loaded as a script tag.</p>

    <p>
      This is the first comment.
      <!-- We will put our React component inside this div. -->
      <div class="like_button_container" data-commentid="1"></div>
    </p>

  </body>
<script src="https://unpkg.com/[email protected]/umd/react.production.min.js"></script>
<script src="https://unpkg.com/[email protected]/umd/react-dom.production.min.js"></script>

<script type="text/javascript">
import React, { Component } from 'react';

const e = createElement;
class LikeButton extends Component {
  constructor(props) {
    super(props);
    this.state = { liked: false };
  }
  render() {
    let isLiked = localStorage.getItem("likedState") || this.state.liked;
    if (isLiked) {
      return 'You liked comment number ' + this.props.commentID;
    }
    return e(
      'button',
      { onClick: () => { localStorage.setItem("likedState", true); this.setState({ liked: true })} },
      'Like'
    );
  }
}
document.querySelectorAll('.like_button_container')
  .forEach(domContainer => {
    const commentID = parseInt(domContainer.dataset.commentid, 10);
    ReactDOM.render(
      e(LikeButton, { commentID: commentID }),
      domContainer
    );
  });
</script>
</html>

There is a server part (in Java) that processes the js code from this example and substitutes the already transpiled code there:

init("var babelWrapper=function(bwc){return Babel.transform(bwc," +
    "{" +
    "presets:['es2015', 'react', 'stage-1']," +
    "sourceMaps:" + (isDev ? "'inline'" : "false") + "," +
    "comments: " + isDev + "," +
    "plugins:['" + Optional.ofNullable(module)
        .map(s -> "transform-es2015-modules-" + s)
        .orElse(ARROW_SUPPORT_PLUGIN)
    + "']" +
    "}).code;}", javaScriptFileName());

After transpiling the code, an error in the browser - require is not defined. I connect transform-es2015-modules-amd for babel + requirejs - no errors, but the code does not work (although it is transpiled correctly).
Actually, how can I make the browser understand constructs like import React, { Component } from 'react'; ?
However, I can't use npm or webpack or tools like Browserify (or I just don't understand how to use them on the server side, which is written in Java).