Gopls release v0.21.0 (forthcoming)

Configuration changes

• The new newGoFileHeader option allows toggling automatic insertion of the copyright comment and package declaration in a newly created Go file.

Web-based features

Editing features

Analysis features

reflecttypefor analyzer

The new reflecttypefor modernizer simplifies calls to reflect.TypeOf to use reflect.TypeFor when the runtime type is known at compile time. For example, reflect.TypeOf(uint32(0)) becomes reflect.TypeFor[uint32]().

newexpr analyzer

The newexpr modernizer finds declarations of and calls to functions of this form:

func varOf(x int) *int { return &x }

use(varOf(123))

so that they are transformed to:

//go:fix inline
func varOf(x int) *int { return new(x) }

use(new(123))

(Such wrapper functions are widely used in serialization packages, for instance the proto.{Int64,String,Bool} helpers used with protobufs.)

iterators analyzer

The iterators modernizer replaces loops of this form,

  for i := 0; i < x.Len(); i++ {
      use(x.At(i))
  }

or their “range x.Len()” equivalent, by

  for elem := range x.All() {
      use(x.At(i)
  }

for various types in the standard library that now offer an iterator-based API.

Code transformation features

The Rename operation now treats Doc Links like identifiers, so you can initiate a renaming from a Doc Link.