How Can I List All Exported Types Within a Go Package?

How to List All Exported Types in a Package

In Go, package-level types can be exported by capitalizing their first letter. This allows other packages to access these types. However, there is no built-in function to directly list all exported types in a package.

One way to obtain this information is by using the go/importer package. Here's how:

package main

import (
    "fmt"
    "go/importer"
    "go/pkg"
)

func main() {
    // Import the package you want to inspect
    pkg, err := importer.Default().Import("demo")
    if err != nil {
        fmt.Println("error:", err)
        return
    }

    // Iterate over the scopes and print the exported type names
    for _, declName := range pkg.Scope().Names() {
        fmt.Println(declName)
    }
}

The importer.Default().Import() method takes the package path as an argument and returns a package object representing information about the package. The pkg.Scope() method returns the package scope, which contains all the exported and unexported types, functions, and variables.

Note: This approach may not work in the Go Playground due to limitations in the environment.

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