How Do I Access Local Packages Within a Go Module?

Accessing Local Packages Within a Go Module

Question:

Unable to access local packages within a Go module. The project structure is as follows:

/
  - /platform
      - platform.go
  - main.go
  - go.mod

Importing the platform package in main.go results in the error: cannot find module for path platform.

Answer:

To access local packages in a Go module, you can use the replace directive in the go.mod file. This directive allows you to specify a local path to a module that is not published remotely.

In the main module's go.mod file, add the following lines:

module github.com/userName/mainModule

require "github.com/userName/otherModule" v0.0.0
replace "github.com/userName/otherModule" v0.0.0 => "local physical path to the otherModule"

The path specified should point to the root directory of the module, and can be absolute or relative.

In main.go, to import a specific package like platform from the otherModule module, use the following import path:

import "github.com/userName/otherModule/platform"

Additional Information:

• Modules in Go are collections of packages. In Go 11, you can use modules without publishing them remotely.
• If packages are in the same project, you can import them directly using their package names.
• For separate modules, the replace directive is used to reference local packages without publishing them remotely.

Refer to the following resources for more details:

• [Golang Modules](https://go.dev/blog/modules)

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