Indentation in Go: tabs or spaces?

Is there a standard Google Go coding conventions document somewhere that sets whether tabs or spaces are preferred for indentation in Go source code?

What is the official recommendation, if any?

The official recommendation is formatting your code with

go fmt

or using the gofmt command directly

gofmt -w .

You can read more about it here on the go.dev blog, or from the Effective go document:

Indentation

We use tabs for indentation and gofmt emits them by default. Use spaces only if you must.

Stack Overflow Q#19094704, score: 279