Allows us to reference files relative to our JS_DIR wthing our imports using '~' e.g. `'~/main.js'` would import the file `JS_DIR + '/main.js'`

babel-plugin-project-relative-import.js

/**
 * Allows us to referece files relative to our JS_DIR wthing our imports uing '~'
 *
 * e.g. '~/main.js' would import the file JS_DIR +'/main.js'
 */
var Path = require('path')
var JS_DIR = '/app/js';
/*
  // For referece : Babel 5 version
 module.exports = function (babel) {
  // get the working directory
  var cwd = process.cwd();

  return new babel.Transformer("babel-plugin-project-relative-import", {
    ImportDeclaration: function(node, parent) {


      // probably always true, but let's be safe
      if (!babel.types.isLiteral(node.source)) {
     	return node;
      }

      var ref = node.source.value;

      // ensure a value, make sure it's not home relative e.g. ~/foo
      if (!ref || ref[0] !== '~') {
        return node;
      }
		node.source.value = cwd + JS_DIR + node.source.value.slice(1);

      return node;
    }
  });
};
*/


module.exports = function () {
  var cwd = process.cwd();
	return {
		visitor: {
			ImportDeclaration: function(path, state) {
		        var importPath = path.node.source.value;
		        if (importPath[0]=== '~') {
		          path.node.source.value = cwd + JS_DIR + importPath.slice(1);
		        }
		    }
		}
	};
};