Make rbush an ES6 library (mourner#89)

* Make rbush an ES6 library.

* Update package.json and rollup config

* Fix gitignore and travis config

.gitignore

@@ -1,5 +1,6 @@
 node_modules
 npm-debug.log
 coverage
+.nyc_output
 rbush.js
 rbush.min.js

.travis.yml

@@ -1,4 +1,4 @@
 language: node_js
 node_js:
-  - "4"
+  - "8"
   - "stable"

bench/perf.js

@@ -1,4 +1,4 @@
-'use strict';
+import rbush from '..';
 
 var N = 1000000,
     maxFill = 16;
@@ -31,8 +31,6 @@ var bboxes100 = genData(1000, 100 * Math.sqrt(0.1));
 var bboxes10 = genData(1000, 10);
 var bboxes1 = genData(1000, 1);
 
-var rbush = typeof require !== 'undefined' ? require('..') : rbush;
-
 var tree = rbush(maxFill);
 
 console.time('insert one by one');

index.js

@@ -1,11 +1,6 @@
-'use strict';
+import quickselect from 'quickselect';
 
-module.exports = rbush;
-module.exports.default = rbush;
-
-var quickselect = require('quickselect');
-
-function rbush(maxEntries, format) {
+export default function rbush(maxEntries, format) {
     if (!(this instanceof rbush)) return new rbush(maxEntries, format);
 
     // max entries in a node is 9 by default; min node fill is 40% for best performance

package.json

@@ -17,39 +17,48 @@
   ],
   "author": "Vladimir Agafonkin",
   "license": "MIT",
-  "main": "index.js",
-  "jsdelivr": "rbush.js",
-  "unpkg": "rbush.js",
+  "main": "rbush.js",
+  "module": "index.js",
+  "browser": "rbush.min.js",
+  "jsdelivr": "rbush.min.js",
+  "unpkg": "rbush.min.js",
   "devDependencies": {
     "benchmark": "^2.1.4",
-    "browserify": "^14.5.0",
     "eslint": "^4.13.1",
     "eslint-config-mourner": "^2.0.3",
+    "esm": "^3.0.84",
     "faucet": "0.0.1",
-    "istanbul": "~0.4.5",
-    "tape": "^4.8.0",
-    "uglify-js": "^3.2.2"
+    "nyc": "^13.1.0",
+    "rollup": "^0.67.3",
+    "rollup-plugin-node-resolve": "^3.4.0",
+    "rollup-plugin-terser": "^3.0.0",
+    "tape": "^4.8.0"
   },
   "scripts": {
-    "test": "eslint index.js test/test.js && node test/test.js | faucet",
-    "perf": "node ./bench/perf.js",
-    "cov": "istanbul cover test/test.js -x test/test.js",
-    "build": "browserify index.js -s rbush -o rbush.js",
-    "build-min": "browserify index.js -s rbush | uglifyjs -c warnings=false -m > rbush.min.js",
-    "prepare": "npm run build && npm run build-min"
+    "pretest": "eslint index.js test/test.js ",
+    "test": "node -r esm test/test.js | faucet",
+    "perf": "node -r esm ./bench/perf.js",
+    "cov": "nyc --check-coverage --require esm npm test",
+    "build": "rollup -c",
+    "prepare": "npm run build",
+    "prepublishOnly": "npm run build"
   },
   "files": [
+    "index.js",
     "rbush.js",
     "rbush.min.js"
   ],
   "eslintConfig": {
     "extends": "mourner",
+    "parserOptions": {
+      "sourceType": "module"
+    },
     "rules": {
       "new-cap": 0,
       "consistent-return": 0
     }
   },
   "dependencies": {
-    "quickselect": "^1.0.1"
+    "quickselect": "^2.0.0"
   }
 }

rollup.config.js

@@ -0,0 +1,17 @@
+import {terser} from 'rollup-plugin-terser';
+import resolve from 'rollup-plugin-node-resolve';
+
+const output = (file, plugins) => ({
+    input: 'index.js',
+    output: {
+        name: 'rbush',
+        format: 'umd',
+        file
+    },
+    plugins
+});
+
+export default [
+    output('rbush.js', [resolve()]),
+    output('rbush.min.js', [resolve(), terser()])
+];

test/test.js

@@ -1,9 +1,8 @@
-'use strict';
 
 /*eslint key-spacing: 0, comma-spacing: 0 */
 
-var rbush = require('..'),
-    t = require('tape');
+import rbush from '..';
+import t from 'tape';
 
 function sortedEqual(t, a, b, compare) {
     compare = compare || defaultCompare;