Integrate babel

So that we can maximise compatibility and yet still write modern
JavaScript, use Babel to compile ES2015.

.babelrc

@@ -0,0 +1,3 @@
+{
+    "presets": ["es2015"]
+}

.eslintrc.js

@@ -1,7 +1,8 @@
 module.exports = {
     "env": {
         "es6": true,
-        "node": true
+        "node": true,
+        "jest": true
     },
     "extends": "eslint:recommended",
     "rules": {
@@ -21,9 +22,11 @@ module.exports = {
             "error",
             "always"
         ],
-        "curly": [
-            "error",
-            "all"
+        "no-console": [
+            "warn"
         ]
+    },
+    "parserOptions": {
+        "sourceType": "module"
     }
 };

.gitignore

@@ -1 +1,2 @@
 node_modules
+lib

.npmignore

@@ -0,0 +1 @@
+src

package.json

@@ -2,7 +2,11 @@
   "name": "identifiers-bibcode",
   "version": "0.1.0",
   "description": "Extract, validate and normalize ADS Bibcodes.",
-  "keywords": ["ads", "bibcode", "identifiers"],
+  "keywords": [
+    "ads",
+    "bibcode",
+    "identifiers"
+  ],
   "main": "./lib/bibcode.js",
   "repository": "https://github.com/altmetric/identifiers-bibcode",
   "bugs": "https://github.com/altmetric/identifiers-bibcode/issues",
@@ -12,12 +16,17 @@
     "node": ">= 4"
   },
   "devDependencies": {
+    "babel-cli": "^6.24.1",
+    "babel-jest": "^20.0.3",
+    "babel-preset-es2015": "^6.24.1",
     "eslint": "^3.15.0",
     "jest": "^18.1.0"
   },
   "scripts": {
-    "pretest": "eslint lib tests",
-    "test": "jest"
+    "pretest": "yarn compile && eslint src tests",
+    "test": "jest",
+    "compile": "babel src -d lib",
+    "prepublish": "yarn compile"
   },
   "jest": {
     "testEnvironment": "node"

tests/bibcode.test.js

@@ -1,4 +1,3 @@
-/* globals test, expect */
 "use strict";
 
 const bibcode = require("../lib/bibcode");