Best way to link to another package in doc.go file

php editor Baicao will introduce you to the best way to link to another package in the doc.go file. When we use multiple packages in a Go language project, sometimes we need to reference the documentation of other packages in the doc.go file. In this case, we can use the "go doc" command to view the documentation, but what is a better way if we want to directly link to the documentation of other packages in the doc.go file? In the following article, we will explain in detail how to achieve this goal.

Question content

When writing package documentation in a doc.go file, what is the best way to link to documentation in another package? Unfortunately, the normal way of referencing imported packages doesn't work in a doc.go file, since unused imports are not allowed.

// package foo docs in a doc.go file
// foo uses [bar.bar] types for doing things.
package foo

import "foo.com/jonathan/godoctest/bar" // unused import error here

Using a fully qualified path does work, but you won't get the most readable documentation:

// Package foo docs in a doc.go file
// foo uses [foo.com/jonathan/godoctest/bar.Bar] types for doing things.
package foo

Is there any solution?

Solution

Use a variable named _ to reference the identifier in the imported package (blank identifier)

// Package foo docs in a doc.go file
// foo uses [bar.Bar] types for doing things.
package foo

import "foo.com/jonathan/godoctest/bar"

var _ bar.SomeType // where bar.SomeType is a type
var _ = bar.Value // where bar.Value is a func, var, constant, ...

Only one reference to the imported package is required. The code above shows the different ways to reference a type or value.

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