How Can I Discover Exported Types from External Go Packages?

Discovering Defined Types in External Packages

In Go, type definitions are exported when their names begin with uppercase letters. To access these types from another package, you can use the go/importer package.

Solution:

package main

import (
    "fmt"

    "go/importer"

    demo "example.com/path/to/demo" // import the package containing the types
)

func main() {
    pkg, err := importer.Default().Import("example.com/path/to/demo")
    if err != nil {
        fmt.Println("error:", err)
        return
    }

    // Get the names of all exported types in the package
    for _, declName := range pkg.Scope().Names() {
        fmt.Println(declName)
    }
}

This code will print the following output, which lists the names of the exported types defined in the demo package:

People
UserInfo

Note: Using go/importer on the Go Playground may result in an error.

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