Why Can\'t I Import My Local Go Module?

Troubleshooting Local Go Module Imports

Question:

Importing a package from a local Go module seems impossible. Despite creating the module and defining a package within it, an error message such as "cannot load github.com/Company/mymodule: no module found" persists. What's the issue?

Answer:

When resolving dependencies in go.mod, Go attempts to fetch third-party modules from the provided remote URL. However, in the case where the module has not yet been pushed to a repository like GitHub, the remote URL does not exist.

Solution:

To resolve this issue for local modules, utilize the replace keyword in go.mod. For instance:

replace github.com/Company/mymodule v0.0.0 => ../mymodule

This instructs Go on where to locate the local module. Ensure the relative path to the module is accurate.

Post-Testing Steps:

After completing local testing and pushing the module to a repository:

• Remove the replace line from go.mod.
• Use go get -u github.com/Company/mymodule to correctly incorporate the module into your project.

Capitalization Note:

Remember that functions and variables in Go packages should begin with a capital letter to be accessible from outside the package.

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