a.go

package a

import (
	"fmt"
)

type A string

var AS A = New()

func init() {
	AS = "Init String"
}

func New() A {
	return "New String"
}

func (a A) Something(msg string) string {
	return fmt.Sprint(a, msg)
}

b.go

package b

import (
	"fmt"
	"playground/init_process/a"
)

var (
	One = a.AS.Something("One")
	Two = a.AS.Something("Two")
)

func ATest() {
	fmt.Println(One)
	fmt.Println(Two)
}

main.go

package main

import (
	"playground/init_process/b"
)

func main() {
	b.ATest()
}