Merge pull request #74 from springmeyer/chore/esm

chore: publish ESM only

Author: jgravois

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node: [16, 18, 20, 22, 24]
+        node: [18, 20, 22, 24]
 
     steps:
       - uses: actions/checkout@v6

.gitignore

@@ -1,5 +1,4 @@
 .DS_store
 node_modules
 coverage
-dist/
-arc.js
+dist

.npmignore

@@ -5,9 +5,36 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased][unreleased]
 
+## [1.0.0] - 2026-03-29
+
+### Breaking change
+
+- arc.js is now a [pure](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c) ESM package. 
+
+If you need to `require()` arc.js as CJS (CommonJS), or have a runtime older than Node.js 18, please use `0.1.4`.
+
+0.x syntax:
+```js
+const arc = require('arc');
+const gc = new arc.GreatCircle(/* */);
+```
+
+1.x syntax:
+```js
+import { GreatCircle } from 'arc';
+const gc = new GreatCircle(/* */);
+```
+
+### Fixed
+
+- antimeridian splitting in GreatCircle.Arc (From @copilot)
+
 ## [0.2.0] - 2025-09-22
+### Breaking
+- Node.js 16 is now the minimum supported runtime
+
 ### Changed
-- TypeScript support with back compatibilty (From @thomas-hervey)
+- TypeScript support with backwards compatibility (From @thomas-hervey)
 
 ## [0.1.4] - 2022-11-16
 ### Changed
@@ -39,7 +66,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 - Fixed jshint strict errors
 
-[unreleased]: https://github.com/springmeyer/arc.js/compare/v0.1.4..HEAD
+[unreleased]: https://github.com/springmeyer/arc.js/compare/v1.0.0..HEAD
+[1.0.0]: https://github.com/springmeyer/arc.js/compare/v0.2.0...v1.0.0
+[0.2.0]: https://github.com/springmeyer/arc.js/compare/v0.1.4...v0.2.0
 [0.1.4]: https://github.com/springmeyer/arc.js/compare/v0.1.3...v0.1.4
 [0.1.3]: https://github.com/springmeyer/arc.js/compare/v0.1.2...v0.1.3
 [0.1.2]: https://github.com/springmeyer/arc.js/compare/v0.1.1...v0.1.2

CHANGELOG.md

@@ -6,7 +6,7 @@ Calculate great circle routes as lines in GeoJSON or WKT format.
 
 **Features:**
 - Full TypeScript support with type definitions
-- Works in Node.js (CommonJS & ES modules) and browsers
+- Works in Node.js and browsers
 - Generates GeoJSON and WKT output formats
 - Handles dateline crossing automatically
 - Based on [Ed Williams' Aviation Formulary](https://edwilliams.org/avform.htm#Intermediate) algorithms and the GDAL source code
@@ -19,15 +19,6 @@ npm install arc
 
 ## Quick Start
 
-### CommonJS (Node.js)
-```js
-const arc = require('arc');
-const gc = new arc.GreatCircle({x: -122, y: 48}, {x: -77, y: 39});
-const line = gc.Arc(100);
-console.log(line.json()); // GeoJSON output
-```
-
-### ES Modules (Node.js, bundlers)
 ```js
 import { GreatCircle } from 'arc';
 const gc = new GreatCircle({x: -122, y: 48}, {x: -77, y: 39});
@@ -45,10 +36,10 @@ const gc = new GreatCircle(start, end);
 const line = gc.Arc(100);
 ```
 
-### Browser (Global)
+### Browser (ESM)
 ```html
-<script src="./arc.js"></script>
-<script>
+<script type="module">
+  import { GreatCircle } from 'https://cdn.skypack.dev/arc@1';
   const gc = new arc.GreatCircle({x: -122, y: 48}, {x: -77, y: 39});
   const line = gc.Arc(100);
 </script>
@@ -165,7 +156,7 @@ arc.js powers the [`greatCircle`](https://turfjs.org/docs/api/greatCircle) funct
 
 ## License
 
-This project is licensed under the BSD license. See [LICENSE.md](LICENSE.md) for details.
+This project is licensed under the BSD license. See [LICENSE.md](LICENSE) for details.
 
 ### Third-Party Licenses
 

README.md

@@ -6,7 +6,6 @@
     <title>arc.js - Great Circle Routes Demo</title>
     <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY=" crossorigin="" />
     <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo=" crossorigin=""></script>
-    <script src="./arc.js"></script>
     <style>
         * {
             box-sizing: border-box;
@@ -340,8 +339,8 @@ <h3>Settings</h3>
                 </div>
 
                 <div class="control-group">
-                    <button class="btn" onclick="clearMap()">Clear All</button>
-                    <button class="btn btn-danger" onclick="resetView()">Reset View</button>
+                    <button id="clear" class="btn">Clear All</button>
+                    <button id="reset" class="btn btn-danger">Reset View</button>
                 </div>
             </div>
 
@@ -357,8 +356,9 @@ <h4>Generated GeoJSON</h4>
             </div>
         </div>
     </div>
-
-    <script>
+    <script type="module">
+        import { GreatCircle } from 'https://cdn.skypack.dev/arc@1';
+        
         // Initialize map
         var map = L.map('map').setView(new L.LatLng(0, 0), 2);
         var idx = 1;
@@ -468,7 +468,7 @@ <h4>Generated GeoJSON</h4>
                         distance: calculateDistance(from, to)
                     };
 
-                    var greatCircle = new arc.GreatCircle(from, to, properties);
+                    var greatCircle = new GreatCircle(from, to, properties);
                     var gc = greatCircle.Arc(npoints, { offset: offset });
                     var line = new L.geoJson().addTo(map);
                     var geojson_feature = gc.json();
@@ -591,7 +591,7 @@ <h4>Generated GeoJSON</h4>
             };
 
             try {
-                var greatCircle = new arc.GreatCircle(nyc, london, properties);
+                var greatCircle = new GreatCircle(nyc, london, properties);
                 var gc = greatCircle.Arc(npoints, { offset: offset });
                 var line = new L.geoJson().addTo(map);
                 var geojson_feature = gc.json();
@@ -629,6 +629,9 @@ <h4>Generated GeoJSON</h4>
 
         // Initialize JSON output
         updateJsonOutput();
+
+        document.querySelector('#clear').addEventListener('click', clearMap);
+        document.querySelector('#reset').addEventListener('click', resetView);
     </script>
 </body>
 </html>

index.html

@@ -1,4 +1,4 @@
-module.exports = {
+export default {
   // Use ts-jest preset for TypeScript support
   preset: 'ts-jest',