更改导入时，为什么Golang Intellisense在VS Code中运行缓慢？

Question

I have the ms-vscode.go Go extension installed in my VS Code setup and am using the gopls language server. The language server seems to perform well with Intellisense operations except when I am editing imports, at which point there is considerable lag as every edit to the import takes several seconds to update.

For example, the following is a replay of typing in manually import "net/http" letter-by-letter (rather than copy/paste). The clip runs at 20x speed, so it takes about 1.8 minutes from when I stop typing the import statement to when the language server gets to the correct error of "net/http" imported but not used:

Am I doing something wrong?

My go-related settings:

  "go.useLanguageServer": true,
  "go.alternateTools": {
      "go-langserver": "gopls"
  },

Output from gopls reveals that much time is spent in go list:

4.037297s for ...go "list" "-e" "-json" "-compiled=true" "-test=true" "-export=false" "-deps=true" "-find=false" "--" ...

for every change.

Answer 1

That might be because:

• go tools does not yet support autocompletion of unimported packages #31906: issue 31906
• saibing/tools does.

You could try and see if the issue persist with saibing/tools, using Go 1.13 in module mode.

git clone https://github.com/saibing/tools
cd tools/gopls
go install

Make sure your ~/go/bin (using the default GOPATH) does show a new gopls executable with a recent timestamp.

Relaunch VSCode then.

---

My gopls settings:

"gopls": {
    "usePlaceholders": true, // add parameter placeholders when completing a function
    "enhancedHover": true, // experimental to improve quality of hover (will be on by default soon)
},

But also:

"[go]": {
    "editor.snippetSuggestions": "none",
    "editor.formatOnSave": true,
    "editor.codeActionsOnSave": {
        "source.organizeImports": true
    },
},
"go.lintTool": "golangci-lint",
"go.useLanguageServer": true,
"go.languageServerExperimentalFeatures": {
    "format": true,
    "autoComplete": true
},