Export a default es6 module

Fixes #33

.babelrc

@@ -1,3 +1,6 @@
 {
-  "presets": [["env"]]
+  "presets": ["env"],
+  "plugins": [
+    "add-module-exports"
+  ]
 }

README.md

@@ -73,6 +73,7 @@ The Martinez-Rueda-Feito polygon clipping algorithm is used to compute the resul
 
 ### vNext (in development)
 
+ * Export a default es6 module ([#33](https://github.com/mfogel/polygon-clipping/issues/33))
  * Allow self-crossing rings using [even-odd rule](https://en.wikipedia.org/wiki/Even%E2%80%93odd_rule) ([#30](https://github.com/mfogel/polygon-clipping/issues/30))
  * Fix bug with nearly vertical segments being split ([#29](https://github.com/mfogel/polygon-clipping/issues/29))
  * Fix bug with coincident segments being split slightly differently ([#22](https://github.com/mfogel/polygon-clipping/issues/22))

main.js

@@ -1,18 +1,25 @@
 import doIt from './src'
 import operation from './src/operation'
 
-export const union = (geom, ...moreGeoms) => {
+const union = (geom, ...moreGeoms) => {
   return doIt(operation.types.UNION, geom, moreGeoms)
 }
 
-export const intersection = (geom, ...moreGeoms) => {
+const intersection = (geom, ...moreGeoms) => {
   return doIt(operation.types.INTERSECTION, geom, moreGeoms)
 }
 
-export const xor = (geom, ...moreGeoms) => {
+const xor = (geom, ...moreGeoms) => {
   return doIt(operation.types.XOR, geom, moreGeoms)
 }
 
-export const difference = (subjectGeom, ...clippingGeoms) => {
+const difference = (subjectGeom, ...clippingGeoms) => {
   return doIt(operation.types.DIFFERENCE, subjectGeom, clippingGeoms)
 }
+
+export default {
+  union: union,
+  intersection: intersection,
+  xor: xor,
+  difference: difference,
+}

package.json

@@ -56,6 +56,7 @@
     "webpack-dev-server": "^3.1.4"
   },
   "dependencies": {
+    "babel-plugin-add-module-exports": "^0.2.1",
     "splaytree": "^2.0.2",
     "tinyqueue": "^1.2.3"
   }

test/end-to-end.test.js

@@ -3,7 +3,7 @@
 import fs from 'fs'
 import path from 'path'
 import load from 'load-json-file'
-import * as polygonClipping from '../main'
+import polygonClipping from '../main'
 
 /** USE ME TO RUN ONLY ONE TEST **/
 const targetOnly = ''