chore: replace lerna with multi-semantic-release and yarn workspaces

.github/workflows/build_test_publish.yml

@@ -17,6 +17,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          fetch-depth: 0
 
       - name: Set up Node.js
         uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f
@@ -35,12 +37,11 @@ jobs:
           yarn test
 
       - name: Release on npm
-        if: |
-          github.event_name != 'pull_request' &&
-          !startsWith(github.event.head_commit.message, 'chore')
+        if: github.event_name != 'pull_request'
         env:
           GIT_AUTHOR_NAME: Florian Imdahl
           GIT_AUTHOR_EMAIL: ffflorian@users.noreply.github.com
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           export GIT_COMMITTER_NAME="${GIT_AUTHOR_NAME}"
           export GIT_COMMITTER_EMAIL="${GIT_AUTHOR_EMAIL}"

.releaserc.json

@@ -0,0 +1,3 @@
+{
+  "extends": "@ffflorian/semantic-release-config"
+}

AGENTS.md

@@ -4,11 +4,11 @@ This file contains knowledge and conventions for AI agents working in this repos
 
 ## Project Overview
 
-This is a Yarn workspaces monorepo managed by [Lerna](https://lerna.js.org/), containing multiple independently published Node.js/TypeScript packages by [Florian Imdahl](https://github.com/ffflorian).
+This is a yarn workspaces monorepo managed by [multi-semantic-release](https://github.com/qiwi/multi-semantic-release), containing multiple independently published Node.js/TypeScript packages by [Florian Imdahl](https://github.com/ffflorian).
 
 - **License**: GPL-3.0
 - **Node.js requirement**: >= 18.0 (CI uses Node.js 24.x)
-- **Package manager**: Yarn 4.12.0 (Berry)
+- **Package manager**: yarn 4.12.0 (Berry)
 
 ## Packages
 
@@ -60,18 +60,24 @@ yarn workspace @ffflorian/<package-name> add -D <dep>
 
 ### Per-package scripts
 
-Each package supports `build`, `clean`, and `test` scripts run via Lerna.
+Each package supports `build`, `clean`, and `test` scripts run via `yarn workspaces foreach`.
 
 ## Tooling
 
 - **Build**: TypeScript (`tsc`) via per-package `tsconfig.build.json`
-- **Bundler**: Vite (used in some packages)
-- **Testing**: Vitest
+- **Bundler**: vite (used in some packages)
+- **Testing**: vitest
 - **Linting**: oxlint + ESLint with `@ffflorian/eslint-config`, run in that order
-- **Formatting**: Prettier with `@ffflorian/prettier-config`
-- **Git hooks**: Lefthook (`lefthook.yml`) — runs prettier, oxlint, and eslint with auto-fix on staged files before commit
-- **Versioning**: Lerna independent versioning with conventional commits
-- **Publishing**: Lerna publishes to npm registry; only allowed from `main` branch
+- **Formatting**: prettier with `@ffflorian/prettier-config`
+- **Git hooks**: lefthook (`lefthook.yml`) — runs prettier, oxlint, and eslint with auto-fix on staged files before commit
+- **Versioning**: Independent versioning via conventional commits
+- **Publishing**: `multi-semantic-release` (dhoulb) publishes to npm; only packages whose files changed are released. Private packages are excluded via `--ignore-private-packages`. Only allowed from `main` branch.
+- **Cross-repo deps**: When a package in this repo depends on another package in this repo, use `*` as the version — multi-semantic-release replaces it with the correct version at publish time.
+- **Release config**: Root `.releaserc.json` extends `@ffflorian/semantic-release-config`
+
+## Dependencies
+
+**Always use pinned (exact) versions in `package.json`.** Do not use `^`, `~`, or other range specifiers for dependencies. This is enforced by `defaultSemverRangePrefix: ''` in `.yarnrc.yml`.
 
 ## Commit Messages
 
@@ -89,7 +95,8 @@ ci: CI/CD configuration changes
 ```
 
 - Do **not** include references to Claude or AI tools in commit messages or PR descriptions.
-- Lerna uses conventional commits to determine version bumps and generate changelogs.
+- `multi-semantic-release` uses conventional commits to determine version bumps and generate changelogs.
+- Only packages with commits touching their own directory are released — unrelated packages are never published.
 
 ## Branch Naming
 
@@ -111,7 +118,8 @@ GitHub Actions workflow (`.github/workflows/build_test_publish.yml`):
 
 1. Runs on pushes and PRs to `main`
 2. Steps: install (`yarn --immutable`), build, lint, test
-3. On push to `main` (non-`chore` commits): publishes changed packages to npm via `yarn release`
+3. On push to `main`: runs `yarn release` (`multi-semantic-release`) which publishes only changed packages to npm
+4. Requires `GITHUB_TOKEN` and OIDC for npm auth; checkout uses `fetch-depth: 0` for full git history
 
 ## Code Style
 
@@ -124,7 +132,14 @@ GitHub Actions workflow (`.github/workflows/build_test_publish.yml`):
 
 ## Before Committing
 
-Always run `yarn fix` before committing to auto-fix linting and formatting errors:
+After implementing any change, always run build and tests to verify correctness:
+
+```sh
+yarn build:ts
+yarn test
+```
+
+Then run `yarn fix` to auto-fix linting and formatting errors before committing:
 
 ```sh
 yarn fix

package.json

@@ -6,6 +6,9 @@
     "@evilmartians/lefthook": "2.1.4",
     "@ffflorian/eslint-config": "0.13.7",
     "@ffflorian/prettier-config": "0.6.7",
+    "@ffflorian/semantic-release-config": "0.10.7",
+    "@semantic-release/changelog": "6.0.3",
+    "@semantic-release/git": "10.0.1",
     "@types/node": "~24",
     "eslint": "10.1.0",
     "eslint-import-resolver-typescript": "4.4.4",
@@ -14,9 +17,10 @@
     "eslint-plugin-perfectionist": "5.7.0",
     "globals": "17.4.0",
     "jiti": "2.6.1",
-    "lerna": "9.0.7",
+    "multi-semantic-release": "3.1.0",
     "oxlint": "1.56.0",
     "prettier": "3.8.1",
+    "semantic-release": "25.0.3",
     "typescript": "6.0.2",
     "typescript-eslint": "8.57.1",
     "vite": "8.0.1",
@@ -31,8 +35,8 @@
   "prettier": "@ffflorian/prettier-config",
   "private": true,
   "scripts": {
-    "build:ts": "lerna run build --concurrency 4",
-    "clean": "lerna run clean",
+    "build:ts": "yarn workspaces foreach --all --parallel --topological --exclude node-packages run build",
+    "clean": "yarn workspaces foreach --all --parallel --exclude node-packages run clean",
     "dist": "yarn clean && yarn build:ts",
     "fix": "yarn fix:ts && yarn fix:other",
     "fix:other": "yarn prettier --write",
@@ -43,9 +47,9 @@
     "lint:ts:eslint": "eslint packages/",
     "lint:ts:oxlint": "oxlint --ignore-path .gitignore packages/",
     "prettier": "prettier .",
-    "release": "lerna publish",
+    "release": "multi-semantic-release --ignore-private-packages",
     "test": "yarn test:all",
-    "test:all": "lerna run test --concurrency 4"
+    "test:all": "yarn workspaces foreach --all --parallel --exclude node-packages run test"
   },
   "workspaces": [
     "packages/*"

packages/my-timezone/package.json

@@ -3,7 +3,7 @@
   "bin": "dist/cli.js",
   "dependencies": {
     "commander": "14.0.3",
-    "ntpclient": "1.16.1"
+    "ntpclient": "*"
   },
   "description": "Get the exact time based on your location.",
   "devDependencies": {