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monorepo-next

A simple monorepo sample reference using turborepo, lernajs and pnpm

Getting started

Managing monorepos has become more than a trending topic but a key argument to consider and to master in managing large and complex projects, or even projects including multiple packages. There is a huge literature all around about techniques, management, pros&cons, benefits and more, a good place to find references could be Awesome monorepo.

Usually managing monorepos in nodejs/javascript is often made using lernajs althought some alternatives during the time has been implemented, The basic toolchain usually relied on lerna and a package manager between npm and yarn.

Althought there are several tools and farmeworks too to manage monorepos for several languages & runtimes, this repository aim to provide a simple sample reference for nodejs monorepos considering a powerful and strong toolchain splitting the responsibilities in:

  1. Build system
  2. Monorepo management
  3. Package management

Features

  • Configurable build system
  • Dependency hoisting
  • Workspace management
  • (Independent) Packages versioning
  • Conventional commits
  • Commit message linting
  • Changelog generation per package
  • Git integration

What's inside

This monorepo configuration makes use of the following packages per feature:

Feat Name Package(s) Notes
Configurable Build System Turborepo turbo
Packages versioning Lerna lerna
@lerna/project
Dependency hoisting, Workspace management Pnpm -
Conventional commits Committizen commitizen
cz-conventional-changelog
cz-lerna-changelog
Commit message linting Commitlint @commitlint/cli
@commitlint/config-conventional
@commitlint/core"
@commitlint/prompt
Git integration Husky husky

Configuration

Workspace management & dependency hoisting

1. Workspaces

  • enabled through pnpm within the file pnpm-workspace.yaml
  • manage packages in packages folder
  • exclude everything inside any test folder

2. Dependency hoisting

3. Packages management & resolution

Package versioning

1. version command enhancement

  • configured within lerna.json file, versioning supported only in main branch using conventionalCommits through a chore(release) message:
    ...
    "command": {
      "version": {
        "allowBranch": "main",
        "conventionalCommits": true,
        "exact": true,
        "message": "chore(release): %s"
      }
    },
    ...

2. version independent

  • configured within lerna.json file, permit an independent versioning strategy per affected package:
    ...
    "version": "independent",
    ...

3. npmClient override

  • configured within lerna.json file, permit to use as npmClient a different package manager, here pnpm
    ...
    "npmClient": "pnpm",
    ...

4. workspaces

  • althought workspaces are managed and configured using pnpm, lerna requires to have visibility of such configuration within lerna.json file
    ...
    "useWorkspaces": "true",
    ...

Conventional commits

1. Changelog generation per package

  • configured within package.json file, permit to specify what strategy to use for changelog generation based on conventional commits. Considering the independent versioning management per package through lerna, the package cz-lerna-changelog permit to manage it according to monorepo packages:
    ...
    "config": {
      "commitizen": {
        "path": "./node_modules/cz-lerna-changelog"
      }
    }
    ...

conventional commits are then managed via terminal as

Commit message linting

1. Git integration

  • configured within package.json file, permit to apply linting to commit messages
    ...
    "husky": {
      "hooks": {
        "commit-msg": "commitlint -e $HUSKY_GIT_PARAMS"
      }
    },
    ...

Configurable Build System

1. Turborepo integration

  • configured within package.json file
 ...
 "turbo": {
   "baseBranch": "origin/main"
 },
 ...

Note: Although Turborepo support a rich and versatile configuration and toolchain for managing monorepos, this monorepo is configured for minimal integration alongside to lernajs for versioning and changelog generation.

At present, a sample pipeline is not yet configured.

Structure

The actual monorepo configuration support the management of packages within the usual packages folder

Sample packages

As a sample structure, there are two sample packages

  1. service-one
  2. service-two

both are implemented using a sample Fastify structure with:

Scripts

The monorepo manage the following scripts:

Name Purpose Notes
preinstall check no package manager can be used but pnpm
commit execute conventional commits prompt
build execute the build using turbo repo build system A pipeline is required in order to execute
dev execute the dev script using turbo repo build system A pipeline is required in order to execute
lint execute the linter using turbo repo build system A pipeline is required in order to execute
format prettify code files C3
clean perform a global monorepo cleanup shortcut for clean:artifacts
clean:artifacts perform a cleanup purging all node_modules folders recursive
run:service:one execute the run script and start service-one service-one on PORT 3001
run:service:two execute the run script and start service-two service-two on PORT 3002