add zero-config support for loading ES modules in Node

bin/_mocha

@@ -1,10 +1,12 @@
 #!/usr/bin/env node
 'use strict';
 
+const esmRequire = require('esm')(module);
+
 /**
  * This file remains for backwards compatibility only.
  * Don't put stuff in this file.
  * @see module:lib/cli
  */
 
-require('../lib/cli').main();
+esmRequire('../lib/cli').main();

package.json

@@ -489,6 +489,7 @@
     "debug": "3.2.6",
     "diff": "3.5.0",
     "escape-string-regexp": "1.0.5",
+    "esm": "3.1.4",
     "findup-sync": "2.0.0",
     "glob": "7.1.3",
     "growl": "1.10.5",

test/integration/options.spec.js

@@ -774,7 +774,7 @@ describe('options', function() {
           setTimeout(function() {
             // kill the child process
             mocha.kill('SIGINT');
-          }, 1000);
+          }, 1500);
         });
       });
     });