Update project to get proper ESM export and tests.

.changeset/config.json

@@ -4,7 +4,7 @@
   "commit": false,
   "fixed": [],
   "linked": [],
-  "access": "restricted",
+  "access": "public",
   "baseBranch": "master",
   "updateInternalDependencies": "patch",
   "ignore": []

.changeset/metal-bananas-press.md

@@ -0,0 +1,5 @@
+---
+"@colyseus/timer": minor
+---
+
+Update project to get proper ESM export and tests.

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install pnpm
+        run: npm install -g pnpm
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Run CI
+        run: npm run ci

.gitignore

@@ -1,4 +1,4 @@
 .DS_Store
 node_modules
-npm-debug.log
 build
+dist

.npmignore

@@ -1,4 +1,4 @@
+!dist
 src
 .changeset
-node_modules
-test
+node_modules

.prettierrc

@@ -1,4 +1,7 @@
 {
+  "semi": true,
   "singleQuote": false,
-  "printWidth": 100
+  "trailingComma": "all",
+  "printWidth": 100,
+  "tabWidth": 2
 }