Implement modular compilation

test/codegen/expect/sunflower/circle.js

Index: test/codegen/expect/sunflower/circle.js
diff --git a/test/codegen/expect/sunflower/circle.js b/test/codegen/expect/sunflower/circle.js
deleted file mode 100644
index 5cfbba562871d38a2b0d0d2c72d7eb0b04afb13f..0000000000000000000000000000000000000000
--- a/test/codegen/expect/sunflower/circle.js
+++ /dev/null
@@ -1,20 +0,0 @@
-dart_library.library('sunflower/circle', null, /* Imports */[
-  'dart/_runtime',
-  'dart/core'
-], /* Lazy imports */[
-], function(exports, dart, core) {
-  'use strict';
-  let dartx = dart.dartx;
-  class Circle extends core.Object {
-    Circle(x, y, radius) {
-      this.x = x;
-      this.y = y;
-      this.radius = radius;
-    }
-  }
-  dart.setSignature(Circle, {
-    constructors: () => ({Circle: [Circle, [core.num, core.num, core.num]]})
-  });
-  // Exports:
-  exports.Circle = Circle;
-});