Import Cycle Not Allowed

Why This Happens

Go does not allow circular imports between packages. If package A imports package B and package B imports package A, the compiler rejects it. This forces clean dependency hierarchies. Break the cycle by moving shared types or interfaces into a separate package.

The Problem

// package user
import "myapp/order" // user imports order

// package order
import "myapp/user" // order imports user — cycle!

The Fix

// package types (new shared package)
type UserID int
type OrderID int

// package user
import "myapp/types" // no cycle

// package order
import "myapp/types" // no cycle

Step-by-Step Fix

1. 1

   Identify the cycle

   Read the error to find the chain of imports that forms the cycle.

2. 2

   Find shared types

   Identify which types or interfaces are used by both packages and cause the dependency.

3. 3

   Extract to a common package

   Move shared types to a new package that both original packages can import without creating a cycle.