How Can I Import Local Packages in My Go Module Project?

Go Modules and Importing Local Packages

Attempting to import local packages within a Go module project can present challenges. Consider a project structure with packages stored outside the gopath:

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

With the platform package defined in platform.go and main.go attempting to import the platform package, you might encounter the error:

cannot find module for path platform

To resolve this issue, we navigate the functionality of Go modules.

In Go 11, modules provide the means to organize and manage packages. Two approaches are available depending on the relationship between the packages:

Same Project:
If the packages reside within the same project, a simple modification to the go.mod file is sufficient:

module github.com/userName/moduleName

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

Separate Modules:
If the packages are separated into distinct modules, a replace directive can be employed:

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"

Within main.go, use the following format to import a specific package from the local module:

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

By leveraging these techniques, you can seamlessly access local packages within Go module projects.

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