Skip to content
unimport is a Go static analysis tool to find unnecessary import aliases.
Branch: master
Clone or download

Latest commit

Fetching latest commit…
Cannot retrieve the latest commit at this time.


Type Name Latest commit message Commit time
Failed to load latest commit information.


unimport is a Go static analysis tool to find unnecessary import aliases.


go get -u


Similar to other Go static anaylsis tools (such as golint, go vet) , unimport can be invoked with one or more filenames, directories, or packages named by its import path. Unimport also supports the ... wildcard.

unimport files/directories/packages

Currently, no flag are supported. A -w flag may be added in the future to automatically remove aliases where possible (Similar to gofmt's -w flag).


As noted in Go's Code Review comments:

Avoid renaming imports except to avoid a name collision; good package names should not require renaming. In the event of collision, prefer to rename the most local or project-specific import.

This tool will check if any import aliases are truly needed (by ensuring there is a name collision that would exist without the import alias). This tool will ignore import paths containing dashes and dots, as these are generally useful aliases while importing a specific revision. For example, in gometalinter, there are some imports like kingpin "". This is a reasonable import alias and will not be flagged.


Running unimports on the Go source:

$ unimport $GOROOT/src/...
cmd/go/pkg.go:18 unnecessary import alias pathpkg
go/build/build.go:19 unnecessary import alias pathpkg
go/internal/gcimporter/gcimporter.go:23 unnecessary import alias exact
os/pipe_test.go:14 unnecessary import alias osexec
os/os_windows_test.go:10 unnecessary import alias osexec

Below are some of the arguably unneeded import aliases it found:

// go/internal/gcimporter/gcimporter.go
import (                                                                                       
    exact "go/constant"                                                                        

// os/pipe_test.go.go
import (                                                                                       
    osexec "os/exec"                                                                           


  • Unit tests
  • Flagging of packages that contain an uppercase letter or underscore
  • -w flag to write changes to file where/if possible
  • Globbing support (e.g. unimport *.go)


Pull requests welcome!

  • nakedret - Finds naked returns.
  • prealloc - Finds slice declarations that could potentially be preallocated.
You can’t perform that action at this time.