error: go: go.mod file not found in current directory or any parent directory about cascadia HOT 8 CLOSED

⇒  git clone https://github.com/suntong/cascadia
Cloning into 'cascadia'...
remote: Enumerating objects: 314, done.
remote: Counting objects: 100% (107/107), done.
remote: Compressing objects: 100% (78/78), done.
remote: Total 314 (delta 56), reused 61 (delta 26), pack-reused 207
Receiving objects: 100% (314/314), 84.58 KiB | 4.97 MiB/s, done.
Resolving deltas: 100% (184/184), done.

⇒  cd cascadia

⇒  go mod init
go: cannot determine module path for source directory /Users/devalias/dev/tmp/cascadia (outside GOPATH, module path must be specified)

Example usage:
	'go mod init example.com/m' to initialize a v0 or v1 module
	'go mod init example.com/m/v2' to initialize a v2 module

Run 'go help mod init' for more information.


⇒  go mod init github.com/suntong/cascadia
go: creating new go.mod: module github.com/suntong/cascadia
go: to add module requirements and sums:
	go mod tidy

⇒  go mod tidy
go: finding module for package golang.org/x/net/html
go: finding module for package github.com/PuerkitoBio/goquery
go: finding module for package github.com/andybalholm/cascadia
go: finding module for package github.com/mkideal/cli
go: finding module for package github.com/mkideal/cli/ext
go: downloading golang.org/x/net v0.5.0
go: downloading github.com/PuerkitoBio/goquery v1.8.0
go: downloading github.com/mkideal/cli v0.2.7
go: downloading github.com/andybalholm/cascadia v1.3.1
go: found github.com/PuerkitoBio/goquery in github.com/PuerkitoBio/goquery v1.8.0
go: found github.com/andybalholm/cascadia in github.com/andybalholm/cascadia v1.3.1
go: found github.com/mkideal/cli in github.com/mkideal/cli v0.2.7
go: found github.com/mkideal/cli/ext in github.com/mkideal/cli v0.2.7
go: found golang.org/x/net/html in golang.org/x/net v0.5.0
go: downloading github.com/mkideal/pkg v0.1.3
go: downloading github.com/labstack/gommon v0.3.0
go: downloading github.com/mattn/go-colorable v0.1.7
go: downloading github.com/mattn/go-isatty v0.0.12
go: downloading github.com/mkideal/expr v0.1.0
go: downloading golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
go: downloading github.com/stretchr/testify v1.4.0
go: downloading golang.org/x/sys v0.4.0
go: downloading gopkg.in/yaml.v2 v2.2.2
go: downloading github.com/davecgh/go-spew v1.1.0
go: downloading github.com/pmezard/go-difflib v1.0.0
go: downloading golang.org/x/term v0.4.0