Make the module ES modules compatible

.gitignore

@@ -1,3 +1,6 @@
+# Build artefacts
+index.cjs
+
 # Logs
 logs
 *.log

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
 node_js:
-  - 10
+  - 12
   - node

geojson-rewind → geojson-rewind.js

@@ -1,11 +1,13 @@
 #!/usr/bin/env node
 
-var rewind = require('./'),
-    getStream = require('get-stream'),
-    fs = require('fs'),
-    argv = require('minimist')(process.argv.slice(2), {
-        boolean: 'clockwise'
-    });
+import rewind from "@mapbox/geojson-rewind";
+import getStream from "get-stream";
+import fs from "fs";
+import minimist from "minimist";
+
+const argv = minimist(process.argv.slice(2), {
+    boolean: 'clockwise'
+});
 
 const help = `
 usage:

index.js

@@ -1,7 +1,4 @@
-
-module.exports = rewind;
-
-function rewind(gj, outer) {
+export default function rewind(gj, outer) {
     var type = gj && gj.type, i;
 
     if (type === 'FeatureCollection') {

package.json

@@ -2,17 +2,27 @@
   "name": "@mapbox/geojson-rewind",
   "version": "0.5.2",
   "description": "enforce winding order for geojson",
-  "main": "index.js",
-  "bin": "geojson-rewind",
+  "main": "index.cjs",
+  "type": "module",
+  "module": "index.js",
+  "bin": {
+    "geojson-rewind": "geojson-rewind.js"
+  },
+  "exports": {
+    "import": "./index.js",
+    "require": "./index.cjs"
+  },
   "directories": {
     "test": "test"
   },
   "scripts": {
-    "test": "tape test/rewind.js"
+    "test": "tape test/rewind.js",
+    "prepare": "rollup -c"
   },
   "files": [
     "index.js",
-    "geojson-rewind"
+    "index.cjs",
+    "geojson-rewind.js"
   ],
   "repository": {
     "type": "git",
@@ -36,6 +46,7 @@
     "minimist": "^1.2.7"
   },
   "devDependencies": {
+    "rollup": "^3.27.0",
     "tape": "^5.5.3"
   }
 }

rollup.config.js

@@ -0,0 +1,8 @@
+export default {
+    input: 'index.js',
+    output: {
+        file: 'index.cjs',
+        format: 'cjs',
+        exports: 'auto'
+    }
+};

test/rewind.js

@@ -1,6 +1,9 @@
-var rewind = require('../'),
-    fs = require('fs'),
-    test = require('tape');
+import rewind from "@mapbox/geojson-rewind";
+import fs from 'fs';
+import test from 'tape';
+import { fileURLToPath } from 'url';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
 
 function f(_) {
     return JSON.parse(fs.readFileSync(_, 'utf8'));