Julia Multi-Package Development

Name: julia-multipackage
Rating: 88
Author: Krastanov

Work with multiple inter-related Julia packages simultaneously, managing dependencies across packages and testing changes together.

When to Use

•Developing a package alongside its dependencies
•Working on packages in the same ecosystem
•Testing changes across package boundaries
•Coordinating breaking changes across packages

Setting Up a Shared Environment

julia

using Pkg
Pkg.activate("quantum-dev")

Pkg.develop(path="./QuantumInterface.jl")
Pkg.develop(path="./QuantumClifford.jl")
Pkg.develop(path="./QuantumSavory.jl")

Directory Structure

code

workspace/
├── quantum-dev/           # Shared dev environment
│   ├── Project.toml
│   └── Manifest.toml
├── QuantumInterface.jl/
├── QuantumClifford.jl/
└── QuantumSavory.jl/

Testing Changes Across Packages

Test Downstream Package with Local Changes

bash

julia --project=$(mktemp -d) -e '
    using Pkg
    Pkg.develop(path="./QuantumClifford.jl")  # Local changes
    Pkg.add("QuantumSavory")                   # Released version
    Pkg.test("QuantumSavory")
'

Test with All Local Packages

bash

julia --project=quantum-dev -e '
    using Pkg
    Pkg.test("QuantumSavory")  # Uses all dev'd packages
'

Quick Reference

Task	Command
Develop package	`Pkg.develop(path="./Pkg.jl")`
Exit dev mode	`Pkg.free("Pkg")`
Check status	`Pkg.status()`
Test package	`Pkg.test("Pkg")`
Create temp env	`Pkg.activate(mktempdir())`

Reference

•Git Workflow - Branching and PR strategies for multi-package changes
•CI Testing - Buildkite downstream testing configuration

Related Skills

•julia-package-dev - Single package development
•julia-github - Git and PR workflows
•julia-ci-buildkite - Downstream testing in CI