added linting and testing boilerplate with sanity check

.babelrc

@@ -0,0 +1,4 @@
+{
+  "presets": ["es2015"],
+  "sourceMaps": true
+}

.eslintrc

@@ -0,0 +1,15 @@
+{
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "sourceType": "module"
+  },
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "node": true
+  },
+  "rules": {
+    "no-console": 0
+  },
+  "extends": "eslint:recommended"
+}

Makefile

@@ -1,17 +1,22 @@
-
 # get Makefile directory name: http://stackoverflow.com/a/5982798/376773
 THIS_MAKEFILE_PATH:=$(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
 THIS_DIR:=$(shell cd $(dir $(THIS_MAKEFILE_PATH));pwd)
 
 # BIN directory
 BIN := $(THIS_DIR)/node_modules/.bin
 
+# Path
+PATH := node_modules/.bin:$(PATH)
+SHELL := /bin/bash
+
 # applications
 NODE ?= $(shell which node)
 YARN ?= $(shell which yarn)
 PKG ?= $(if $(YARN),$(YARN),$(NODE) $(shell which npm))
 BROWSERIFY ?= $(NODE) $(BIN)/browserify
 
+.FORCE:
+
 all: dist/debug.js
 
 install: node_modules
@@ -33,5 +38,11 @@ distclean: clean
 node_modules: package.json
 	@NODE_ENV= $(PKG) install
 	@touch node_modules
+
+lint: .FORCE
+	eslint debug.js
+
+test: .FORCE
+	mocha
 
 .PHONY: all install clean distclean

debug.js

@@ -28,12 +28,6 @@ exports.skips = [];
 
 exports.formatters = {};
 
-/**
- * Previously assigned color.
- */
-
-var prevColor = 0;
-
 /**
  * Previous log timestamp.
  */

package.json

@@ -21,8 +21,18 @@
     "ms": "0.7.2"
   },
   "devDependencies": {
+    "babel": "^6.5.2",
+    "babel-eslint": "^7.1.1",
+    "babel-polyfill": "^6.20.0",
+    "babel-preset-es2015": "^6.18.0",
+    "babel-register": "^6.18.0",
+    "babel-runtime": "^6.20.0",
     "browserify": "9.0.3",
-    "mocha": "*"
+    "chai": "^3.5.0",
+    "eslint": "^3.12.1",
+    "eslint-plugin-babel": "^4.0.0",
+    "mocha": "^3.2.0",
+    "sinon": "^1.17.6"
   },
   "main": "./index.js",
   "browser": "./browser.js",

test/debug_spec.js

@@ -0,0 +1,12 @@
+import { expect } from 'chai';
+
+import debug from '../index';
+
+describe('debug', () => {
+  describe('sanity check', () => {
+    it('passes', () => {
+      const log = debug('test');
+      log('hello world');
+    });
+  });
+})

test/mocha.opts

@@ -0,0 +1 @@
+--compilers js:babel-register