internal/handler.go:83:35: parameter name 'w' is too short for the scope of its usage (varnamelen)
func GetSignin(w http.ResponseWriter, r *http.Request) {
                                  ^
internal/handler.go:171:33: parameter name 'w' is too short for the scope of its usage (varnamelen)
func Signout(w http.ResponseWriter, r *http.Request) {
                                ^
internal/handler.go:287:58: parameter name 'r' is too short for the scope of its usage (varnamelen)
func Sync(w http.ResponseWriter, r *http.Request) {
                                                         ^

 varnamelen:
  # The longest distance, in source lines, that is being considered a "small scope." (defaults to 5)
  # Variables used in at most this many lines will be ignored.
  # max-distance: 5
  # The minimum length of a variable's name that is considered "long." (defaults to 3)
  # Variable names that are at least this long will be ignored.
  # min-name-length: 3
  # Check method receiver names. (defaults to false)
  # check-receiver: false
  # Check named return values. (defaults to false)
  # check-return: false
  # Ignore "ok" variables that hold the bool return value of a type assertion. (defaults to false)
  # ignore-type-assert-ok: false
  # Ignore "ok" variables that hold the bool return value of a map index. (defaults to false)
  # ignore-map-index-ok: false
  # Ignore "ok" variables that hold the bool return value of a channel receive. (defaults to false)
  # ignore-chan-recv-ok: false
  # Optional list of variable names that should be ignored completely. (defaults to empty list)
  ignore-names:
   - err
   - c
   - ctx
   - i
  # Optional list of variable declarations that should be ignored completely. (defaults to empty list)
  # Entries must be in the form of "<variable name> <type>" or "<variable name> *<type>" for
  # variables, or "const <name>" for constants.
  ignore-decls:
   - w http.ResponseWriter
   - r *http.Request
   - r http.Request
   - r *net/http/Request
   - r *mux.Router
  #  - t testing.T
  #  - f *foo.Bar
  #  - e error
  #  - i int
  #  - const C

golangci-lint --version
golangci-lint has version v1.43.0 built from (unknown, mod sum: "h1:SLwZFEmDgopqZpfP495zCtV9REUf551JJlJ51Ql7NZA=") on (unknown)

$ cat main.go
package main

type A struct {
        a1 int
        a2 int
        a3 int
        a4 int
        a5 int
        a6 int
        a7 int
        a8 int
        a9 int
        a0 int
}

func main() {
        i := A{
                a1: 0,
                a2: 0,
                a3: 0,
                a4: 0,
                a5: 0,
                a6: 0,
                a7: 0,
                a8: 0,
                a9: 0,
                a0: 0,
        }
        _ = i
}

$ golangci-lint run . --enable varnamelen
main.go:17:2: variable name 'i' is too short for the scope of its usage (varnamelen)
        i := A{
        ^

$ GOPROXY=direct go get github.com/blizzy78/[email protected]
go: downloading github.com/blizzy78/varnamelen v0.6.1
go: github.com/blizzy78/[email protected]: verifying module: checksum mismatch
        downloaded: h1:iYAU/3A6cpfRm2ZI0P/lece4jsc7GEbzsxTu+vBCChQ=
        sum.golang.org: h1:kttPCLzXFa+0nt++Cw9fb7GrSSM4KkyIAoX/vXsbuqA=

SECURITY ERROR
This download does NOT match the one reported by the checksum server.
The bits may have been replaced on the origin server, or an attacker may
have intercepted the download attempt.

For more information, see 'go help module-auth'.

main.go:4:6: variable name 'i' is too short for the scope of its usage (varnamelen)
	for i := range []struct{}{} {
	   ^

$ cat main.go
package main

func main() {
        i := 0
        //
        //
        //
        //
        //
        //
        //
        //
        //
        //
        _ = i
}

$ golangci-lint run . --enable varnamelen
main.go:4:2: variable name 'i' is too short for the scope of its usage (varnamelen)
        i := 0
        ^

struct st {
  p1 bool
  p2 bool
  ....
}

type Option func(*st)

func New() st {
   s := st{
     // set default values
   }

   for _, o := range oo {
      o(&s)
   }

   return s
}