Implement modular compilation

test/codegen/expect/node_modules.js

Index: test/codegen/expect/node_modules.js
diff --git a/test/codegen/expect/node_modules.js b/test/codegen/expect/node_modules.js
index 3b5f99e26486bc20ee9d094f5494c16c8f8919ad..ad9a93a7c160f02945911772460eb8a1bcb003db 100644
--- a/test/codegen/expect/node_modules.js
+++ b/test/codegen/expect/node_modules.js
@@ -1,50 +1 @@
 'use strict';
-let dart = require("dart/_runtime");
-let core = require("dart/core");
-let dartx = dart.dartx;
-const Callback = dart.typedef('Callback', () => dart.functionType(dart.void, [], {i: core.int}));
-class A extends core.Object {}
-class _A extends core.Object {}
-const B$ = dart.generic(function(T) {
-  class B extends core.Object {}
-  return B;
-});
-let B = B$();
-const _B$ = dart.generic(function(T) {
-  class _B extends core.Object {}
-  return _B;
-});
-let _B = _B$();
-function f() {
-}
-dart.fn(f);
-function _f() {
-}
-dart.fn(_f);
-const constant = "abc";
-exports.finalConstant = "abc";
-dart.defineLazyProperties(exports, {
-  get lazy() {
-    return dart.fn(() => {
-      core.print('lazy');
-      return "abc";
-    }, core.String, [])();
-  }
-});
-exports.mutable = "abc";
-dart.defineLazyProperties(exports, {
-  get lazyMutable() {
-    return dart.fn(() => {
-      core.print('lazyMutable');
-      return "abc";
-    }, core.String, [])();
-  },
-  set lazyMutable(_) {}
-});
-// Exports:
-exports.Callback = Callback;
-exports.A = A;
-exports.B$ = B$;
-exports.B = B;
-exports.f = f;
-exports.constant = constant;