How Can I Import a Local Go Module Without Publishing It?

Importing a Local Go Module Without Publishing

Question:

In a Go project, you want to import a module outside GOPATH without publishing it on GitHub or elsewhere. However, you encounter an error: "cannot find module for path [module name]." Despite initializing the module with "go mod init [module name]," the module remains inaccessible.

Answer:

To import a local Go module without publishing it:

Use a Replace Directive Along with Require

1. In the go.mod file of your main module, add the following lines:

require "module-name" v0.0.0
replace "module-name" v0.0.0 => "{local path to the module}"

2. Replace {local path to the module} with the absolute or relative path to the root directory of your local module.

Explanation:

Go's module system retrieves modules from specified paths. By using the replace directive, you override the expected path and point it to your local module. This allows you to import the module without publishing it.

To Import Package from the Module:

To import a package, such as util, from your local module:

import "module-name/util"

Details:

Go modules require unique identifiers, typically corresponding to public paths. However, the replace directive allows you for custom paths. Instead of relying on publicly available modules, this method helps you work on local modules that are not intended for publishing.

For more information, refer to the Go Modules documentation:

• [Can I work entirely outside of VCS on my local filesystem?](https://go.dev/doc/modules/faq#local)
• [When should I use the replace directive?](https://go.dev/doc/modules/replace)

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