This repo hard forks from golang.org/x/sync/singleflight and support generics to the Group and Key type. Comparing to the original version of singleflight, you are free to use any comparable key type instead of string only.

go get github.com/serkodev/singleflight-any@latest

string key, string value

var g Group[string, string]
v, _, _ := g.Do("foo", func() (string, error) {
    return "bar", nil
})

int key, string value

var g Group[int, string]
v, _, _ := g.Do(123, func() (string, error) {
    return "bar", nil
})

go 1.18 or above.