node: allow preload modules with -i

src/node.js

@@ -140,6 +140,7 @@
  }
 
  } else{
+ startup.preloadModules();
  // If -i or --interactive were passed, or stdin is a TTY.
  if (process._forceRepl || NativeModule.require('tty').isatty(0)){
  // REPL

test/fixtures/define-global.js

@@ -0,0 +1 @@
+global.a = 'test'

test/parallel/test-preload.js

@@ -1,5 +1,5 @@
 'use strict'
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const path = require('path');
 const child_process = require('child_process');
@@ -21,6 +21,7 @@ var fixture = function(name){
 var fixtureA = fixture('printA.js');
 var fixtureB = fixture('printB.js');
 var fixtureC = fixture('printC.js');
+const fixtureD = fixture('define-global.js');
 var fixtureThrows = fixture('throws_error4.js');
 
 // test preloading a single module works
@@ -73,6 +74,18 @@ child_process.exec(nodeBinary + ' '
  assert.equal(stdout, 'A\nB\nhello\n');
  });
 
+// test that preload works with -i
+const interactive = child_process.exec(nodeBinary + ' '
+ + preloadOption([fixtureD])
+ + '-i',
+ common.mustCall(function(err, stdout, stderr){
+ assert.ifError(err);
+ assert.strictEqual(stdout, `> 'test'\n> `);
+ }));
+
+interactive.stdin.write('a\n');
+interactive.stdin.write('process.exit()\n');
+
 child_process.exec(nodeBinary + ' '
  + '--require ' + fixture('cluster-preload.js') + ' '
  + fixture('cluster-preload-test.js'),