From d635d00cd30f835616a1377ab82f459f31eef695 Mon Sep 17 00:00:00 2001
From: Haseeb Ahmad <haseeb.ahmad@mapbox.com>
Date: Wed, 24 Jun 2026 12:24:19 +0200
Subject: [PATCH] CLOUDPLAT-3162: add npm OIDC publish workflow

https://mapbox.atlassian.net/browse/CLOUDPLAT-3162
---
 .github/workflows/npm-release.yml | 15 +++++++++++++++
 CONTRIBUTING.md                   | 24 ++++++++++++++++++++++++
 package.json                      |  5 ++++-
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/npm-release.yml
 create mode 100644 CONTRIBUTING.md

diff --git a/.github/workflows/npm-release.yml b/.github/workflows/npm-release.yml
new file mode 100644
index 0000000..ba2ea44
--- /dev/null
+++ b/.github/workflows/npm-release.yml
@@ -0,0 +1,15 @@
+name: NPM release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  npm-release:
+    uses: mapbox/gha-public/.github/workflows/workflow-npm-oidc-publish.yml@main
+    permissions:
+      id-token: write
+      contents: write
+    with:
+      create-github-release: true
+      environment: npm-release
+      run-tests: false
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..d37a79e
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,24 @@
+# Contributing to sphericalmercator
+
+## Development
+
+```bash
+npm ci
+npm test
+```
+
+## Releasing a new version
+
+Releases are published to npm via GitHub Actions.
+
+### Steps
+
+1. **Bump the version** in `package.json` (follow [semver](https://semver.org))
+2. **Update `CHANGELOG.md`** with a summary of what changed
+3. **Open a PR**, get it reviewed and merged to `main`
+4. **Trigger the release** from the [Actions tab](../../actions/workflows/npm-release.yml):
+   - Select **NPM release** → **Run workflow** → run from `main`
+
+The workflow will publish to npm and create a GitHub release with auto-generated notes.
+
+> **Note:** Only Mapbox maintainers with write access to this repository can trigger the release workflow. External contributors can open and contribute to PRs, but releases are always cut by the owning team.
diff --git a/package.json b/package.json
index 48a72db..e7266bd 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@mapbox/sphericalmercator",
   "description": "Transformations between the Web Mercator projection and Latitude Longitude coordinates",
-  "version": "2.0.2",
+  "version": "2.0.3",
   "licenses": [
     {
       "type": "BSD"
@@ -49,5 +49,8 @@
     "build-esm": "tsc -p . --module nodenext --outDir ./dist/esm && echo '{\"type\": \"module\"}' > ./dist/esm/package.json",
     "build": "npm run clean && npm run build-cjs && npm run build-esm",
     "prepublishOnly": "npm run build"
+  },
+  "publishConfig": {
+    "access": "public"
   }
 }