text: var path = require( 'path' );
  var assert = require( 'assert' );
  
  module.exports = {
  	description: 'uses a custom path resolver (asynchronous)',
  	options: {
  		plugins: [{
  			resolveId: function ( importee, importer ) {
  				var resolved;
  
  				if ( path.normalize(importee) === path.resolve( __dirname, 'main.js' ) ) return importee;
  
  				if ( importee === 'foo' ) {
  					resolved = path.resolve( __dirname, 'bar.js' );
  				} else {
  					resolved = false;
  				}
  
  				return Promise.resolve( resolved );
  			}
  		}]
  	},
  	warnings: [
  		{
  			code: 'UNRESOLVED_IMPORT',
  			message: `'path' is imported by main.js, but could not be resolved – treating it as an external dependency`,
  			url: `https://github.com/rollup/rollup/wiki/Troubleshooting#treating-module-as-external-dependency`
  		}
  	],
  	exports: function ( exports ) {
  		assert.strictEqual( exports.path, require( 'path' ) );
  	}
  };
  