fix(build): build all of src

package.json

@@ -9,7 +9,7 @@
   "scripts": {
     "start": "npm run test:watch",
     "prebuild": "rimraf dist && mkdir dist",
-    "build": "cd src && babel index.js -d ../dist && cd ..",
+    "build": "babel --copy-files --out-dir dist --ignore *.test.js src",
     "commit": "git-cz",
     "eslint": "eslint src/ -c other/src.eslintrc --ignore-path other/src.eslintignore && eslint src/*.test.js",
     "check-coverage": "istanbul check-coverage --statements 100 --branches 100 --functions 100 --lines 100",

src/index.js

@@ -17,7 +17,7 @@ function crossEnv(args) {
 function getCommandArgsAndEnvVars(args) { // eslint-disable-line
   let command;
   const envVars = Object.assign({}, process.env);
-  const commandArgs = args.slice().map(commandConvert);
+  const commandArgs = args.map(commandConvert);
   while (commandArgs.length) {
     const shifted = commandArgs.shift();
     const match = envSetterRegex.exec(shifted);