diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 70210a8..d2e809a 100644
--- a/.github/workflows/tests.yml
+++ b/.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
diff --git a/.gitignore b/.gitignore
index 2a7be2b..03ef1cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
.DS_store
node_modules
coverage
-dist/
-arc.js
+dist
diff --git a/.npmignore b/.npmignore
deleted file mode 100644
index b5c33bd..0000000
--- a/.npmignore
+++ /dev/null
@@ -1,4 +0,0 @@
-.DS_store
-node_modules
-coverage
-index.html
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cc06509..8fb14ca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -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
diff --git a/README.md b/README.md
index 7003614..7840aee 100644
--- a/README.md
+++ b/README.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
-
-
@@ -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
diff --git a/index.html b/index.html
index ec7dc7b..a6787c6 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,6 @@
arc.js - Great Circle Routes Demo
-