Encountering a Runtime Exception while setting up a Client Component in the latest version of Next JS (v13.3

I am facing an issue with a component in my Next JS website. When I attempt to convert it into a Client Component, the page fails to load in the browser and I encounter the following unhandled runtime exception: 

SyntaxError: "undefined" is not valid JSON
.

Below is the code for the component which functions properly... however, if I remove the comment from the first line, everything goes haywire :-(

// 'use client';

export default function Test() {
    return (
        <div>
            Testing 1, 2, 3!
        </div>
    )
}

I am using Next JS version 13.3.0 with experimental appDir feature enabled...

const nextConfig = {
  experimental: {
    appDir: true,
  },
}

Not sure if this could be causing the issue. Although this specific component isn't in the app directory - I moved it outside to a components folder just in case (I found out that components in the app folder are Server Components by default according to this article).

I'm currently stuck and unsure how to proceed. Any suggestions?

javascripttypescriptnext.js

Answer №1

It was brought to my attention that this issue was resolved in the latest canary release just last week (https://github.com/vercel/next.js/issues/47704)

This error seems to specifically impact developers using Windows, and a temporary fix (until v13.3.1 is released) involves utilizing arrow functions for pages/components containing use client.

For instance, in your case:

// 'use client';

const Test = () => {
    return (
        <div>
            Testing 1, 2, 3!
        </div>
    )
}

export default Test

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