graue/foo.js

## foo.js
var _ = require('underscore');

function foo() {
  _(['foo','bar','baz']).each(function(s) {
    console.log(s);
  });
}

module.exports = foo;

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Test page</title>
  </head>
  <body>
    <script src="bundle.js"></script>
  </body>
</html>

## main.js
var foo = require('./foo');

foo();

## package.json
{
  "name": "sourcemaptestcase",
  "version": "0.0.1",
  "private": true,
  "dependencies": {
    "underscore": "1.6.0"
  },
  "devDependencies": {
    "browserify": "3.30.1"
  },
  "scripts": {
    "build-js": "browserify -d main.js >bundle.js"
  }
}
	var _ = require('underscore');

	function foo() {
	_(['foo','bar','baz']).each(function(s) {
	console.log(s);
	});
	}

	module.exports = foo;
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>Test page</title>
	</head>
	<body>
	<script src="bundle.js"></script>
	</body>
	</html>
	{
	"name": "sourcemaptestcase",
	"version": "0.0.1",
	"private": true,
	"dependencies": {
	"underscore": "1.6.0"
	},
	"devDependencies": {
	"browserify": "3.30.1"
	},
	"scripts": {
	"build-js": "browserify -d main.js >bundle.js"
	}
	}