What is the best way to capture dynamic import errors in JavaScript?

I am currently developing a website using Next.js.

My goal is to utilize dynamic import import() to load a module dynamically, even if it may not exist.

If the module does not exist, I am fine with suppressing it:

const Blog = async () => {

    let Layout = <div>Fallback layout</div>
    try {
        const { ModuleLayout } = await import('path-to-module').catch(reason => {})
        if (ModuleLayout) {
            Layout = ModuleLayout
        }
    }
    catch (error) {
        // intentionally swallawed
    }

    return <Layout />
}

I expected the try-catch statement to handle the error suppression.

However, I continue to encounter this error:

Module not found: Can't resolve 'path-to-module'

Why is the catch block not functioning as expected? How can I effectively catch errors with dynamic imports?

Answer №1

Utilizing the try-catch is effective with standard JavaScript in various environments such as the browser and Node:

  try {
    const { ModuleLayout } = await import('path-to-module').catch(reason => { })
    if (ModuleLayout) {
      console.log(ModuleLayout);
    }
  }
  catch (error) {
    console.log('error');
  }

Interestingly, the presence of .catch in this context is deemed unnecessary.

It seems that the complication arises due to Next conducting additional analysis on imports via WebPack:

https://github.com/webpack/webpack/issues/6680#issuecomment-370800037

One suggestion is to restrict the path to a recognized directory, although this may not be suitable for all scenarios. Consider raising an issue on the Next repository to propose the inclusion of a feature that allows disabling static analysis for specific imports, if it aligns with your use case.

For more information on dynamic import in Next, refer to the official documentation: https://nextjs.org/docs/advanced-features/dynamic-import#example

Please note: The path in import('path/to/component') must be explicitly stated and cannot be a template string or variable. Additionally, the import() function must be enclosed within the dynamic() call for Next.js to successfully match webpack bundles/module ids to the specific dynamic() call in order to preload them before rendering. Use of dynamic() within React rendering is limited to the top level of the module to enable preloading, similar to React.lazy.

No clear solution is provided on how to overcome this limitation and achieve a genuinely dynamic export during runtime.

According to a user's experience here, wrapping the import statement in dynamic proved to be effective for resolving the issue.

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