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Discover how to access the `node_modules` folder in Bazel after running `yarn_install` (or `npm_install`). Follow our step-by-step guide for a smooth integration into your Docker container!
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How to Access the node_modules Folder in Bazel After Running yarn_install

If you are new to Bazel, navigating its ecosystem can sometimes feel overwhelming, especially when it comes to integrating your Node.js dependencies. A common challenge encountered is accessing the node_modules folder after running the yarn_install command. This guide will guide you through the solution in a straightforward manner, ensuring you can easily reference your installed packages as needed.

The Challenge

Upon executing yarn_install in your Bazel workspace, you might find yourself unable to reference the entire node_modules directory when defining your Docker image with the nodejs_image rule. For instance, while individual packages like @ npm//express can be accessed without any issues, trying to reference the node_modules folder itself usually results in an error indicating that the package is considered deleted.

Example of the Issue

Here's a snippet from your BUILD.bazel file:

[[See Video to Reveal this Text or Code Snippet]]

Attempting to include @ npm//node_modules leads to errors such as:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

After some exploration and experimentation, a working solution was discovered. To effectively reference the node_modules directory, you need to use the correct Bazel structure. Instead of @ npm//node_modules, the correct path format is:

Step-by-Step Instructions

Use the Correct Path: Update your Bazel BUILD.bazel file to reference the node_modules folder. Instead of using @ npm//node_modules, switch to @ npm//:node_modules.

[[See Video to Reveal this Text or Code Snippet]]

Understanding the Change: The alteration from @ npm//node_modules to @ npm//:node_modules tells Bazel to access the node_modules directory within the npm package context. This slight adjustment is essential because it directs Bazel to the right place.

Build and Verify: After making the adjustment, run your Bazel build command to ensure that the changes resolve the issue. You should now be able to successfully include the entire node_modules directory in your Docker image without encountering errors.

Conclusion

Accessing the node_modules folder in Bazel may initially seem complex, but with the right path structure and understanding, it can be a seamless process. By utilizing @ npm//:node_modules, you can effectively gather all your Node.js dependencies for inclusion in Docker containers or other setups.

With your newly acquired knowledge, you are now set to integrate Node.js packages into your Bazel workspace efficiently. Happy coding!