ASP.NET

Question

I am trying to use the import keyword in a .jsx file in my ASP.NET MVC 5 project. I want to be able to import other React components into another React component, however, when using the import keyword, I am getting the following error:

Uncaught SyntaxError: Cannot use import statement outside a module

Below is my code:

Index.cshtml:

@{
   Layout = null;
}

<html>
<head>
    <title>Hello React</title>
</head>
<body>
    <div id="content"></div>
    <script crossorigin src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.0/umd/react.development.js"></script>
    <script crossorigin src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.0/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/remarkable/1.7.1/remarkable.min.js"></script>
    <script src="@Url.Content("~/Scripts/Tutorial.jsx")"></script>
</body>
</html>

Tutorial.jsx:

import Comment from '../Scripts/Comment.jsx';

class Tutorial extends React.Component {
    render() {
        return (
            <div className="commentBox">
                <h1>Homepage</h1>
                <Comment />
            </div>
        );
    }
}
ReactDOM.render(<Comment />, document.getElementById('content'));

Comment.jsx:

class Comment extends React.Component {
    render() {
        return (
            <p>I am a comment!</p>
        );
    }
}

export default Comment;

If I do not have the imports or if I add the Comment class directly inside of the Tutorial.jsx, it runs fine, but that is not what I am looking for. I want to be able to have all my components in separate .jsx files and be able to import certain components into different ones. Ideas?

EDIT: Fixed export default Comment, however error is still appearing

Dave B · Accepted Answer

The error "Cannot use import statement outside a module" results when a <script> element contains an import statement but the <script> element itself is not declared as an ECMAScript (or ES) module.

The import statement requires your script file Tutorial.jsx to be declared a module. Add the type attribute with the value module to the <script> tag.

See the first paragraph at the top of the page https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import

The import statement cannot be used in embedded scripts unless such script has a type="module".

In your HTML page, change:

<script src="@Url.Content("~/Scripts/Tutorial.jsx")"></script>

to

<script type="module" src="@Url.Content("~/Scripts/Tutorial.jsx")"></script>

ASP.NET - Uncaught SyntaxError: Cannot use import statement outside a module

Tags:

javascript

ecmascript-6

reactjs

asp.net-mvc

MDBerry

1 Answers

Dave B

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