Solving the Mysterious “Failed to resolve import ‘#app/composables/script-stubs'” Error in Vitest

Hey there, fellow developer! Are you tired of staring at that frustrating error message “Failed to resolve import ‘#app/composables/script-stubs'” in Vitest? Well, you’re in luck because today we’re going to dive deep into the world of Vitest and composables to figure out what’s going on and how to fix it once and for all!

What is Vitest, and what are Composables?

Vitest is a popular testing framework for Vue.js applications that provides a fast and efficient way to write unit tests. It’s built on top of Jest and provides many features out of the box, such as code coverage, snapshot testing, and more. Composables, on the other hand, are a way to extract reusable logic from your Vue components and make them more modular and maintainable.

A composable is essentially a function that returns an object with properties that can be used in your Vue components. They’re usually used to handle complex logic, make API calls, or perform other tasks that don’t belong in your component’s code. Think of them as little helpers that make your life as a developer easier!

The Error: “Failed to resolve import ‘#app/composables/script-stubs'”

Now, let’s talk about the error message that brought you here. When you encounter this error, it usually means that Vitest is having trouble resolving an import statement in one of your composables. This can happen for a variety of reasons, which we’ll explore later.

The error message itself is quite cryptic, isn’t it? It doesn’t give you much to go on, but don’t worry, we’ll break it down step by step.

Why does this error occur?

There are a few reasons why you might be seeing this error message. Here are some common culprits:

• Invalid import path: Make sure that the import path in your composable is correct and points to the right file. Typos or incorrect directory structures can cause Vitest to throw a tantrum!
• Mismatched file extensions: If you’re importing a file with a different extension (e.g., `.js` instead of `.ts`), Vitest might get confused. Double-check that your import statements match the file extensions of your composables.
• File not found: This one’s a classic! If the file you’re trying to import doesn’t exist, Vitest will rightfully complain. Make sure the file is present and accounted for.
• Vitest configuration issues: Sometimes, Vitest’s configuration can cause import issues. We’ll explore this further in the solution section.

Solving the Error: Step-by-Step Instructions

Now that we’ve identified the possible causes, let’s dive into the solutions! Follow these steps to resolve the “Failed to resolve import ‘#app/composables/script-stubs'” error:

1. Verify Import Path and File Extensions

   Open your composable file and check the import statement. Make sure the path is correct, and the file extension matches the one in your import statement.

   import { myFunction } from '#app/composables/myComposable';

   In this example, make sure `myComposable.js` exists in the `composables` directory.

2. Check for Typos and File Existence

   Double-check that the file you’re trying to import exists and is spelled correctly. A single typo can cause Vitest to fail.

         // Check if the file exists
         // ls -l #app/composables/myComposable.js
   
         // If the file doesn't exist, create it!
         // touch #app/composables/myComposable.js
       

3. Update Vitest Configuration

   Vitest configuration issues can cause import problems. Let’s update the Vitest config to include the correct paths.

         // vitest.config.js
         import { defineConfig } from 'vitest';
   
         export default defineConfig({
           resolve: {
             alias: {
               '#app': './src/app',
             },
           },
         });
       

   In this example, we’re telling Vitest to resolve the `#app` alias to the `src/app` directory.

4. Exclude Files and Directories from Vitest

   Sometimes, Vitest might get confused by files or directories that don’t belong in your testing environment. Excluding them can help resolve import issues.

         // vitest.config.js
         import { defineConfig } from 'vitest';
   
         export default defineConfig({
           exclude: ['node_modules/**/*', '**/*.css'],
         });
       

   In this example, we’re excluding node modules and CSS files from Vitest’s scope.

Common Pitfalls and Troubleshooting

Even after following the previous steps, you might still encounter issues. Here are some common pitfalls and troubleshooting tips to keep in mind:

Pitfall	Troubleshooting Tip
Importing a file from a parent directory	Use relative imports instead of absolute paths. For example, `import { myFunction } from ‘../myComposable’;` instead of `import { myFunction } from ‘#app/composables/myComposable’;`
Vitest not finding files in subdirectories	Update your Vitest config to include subdirectories in the resolve.alias or resolve.modules configuration.
Failes to resolve imports in nested composables	Make sure to export the composable function from the parent composable file and import it correctly in the child composable.

Conclusion

And there you have it! With these steps and troubleshooting tips, you should be able to resolve the “Failed to resolve import ‘#app/composables/script-stubs'” error in Vitest. Remember to double-check your import paths, file extensions, and Vitest configuration, and don’t hesitate to reach out if you’re still stuck.

Happy coding, and may the Vitest be ever in your favor!

Bonus Tip: If you’re using a monorepo with multiple packages, make sure to update your Vitest configuration to include the correct paths for each package.

Additional Resources:

• Vitest Configuration Documentation
• Vue Composition API Documentation
• Vue Composition API Issue (Failed to resolve import)

We hope this comprehensive guide has helped you solve the “Failed to resolve import ‘#app/composables/script-stubs'” error in Vitest. If you have any more questions or need further assistance, feel free to ask!

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