Initial cut for a development server

lib/src/codegen/code_generator.dart

Index: lib/src/codegen/code_generator.dart
diff --git a/lib/src/codegen/code_generator.dart b/lib/src/codegen/code_generator.dart
index d7b88dabfa54d0084ffe815c497c212a1e5da6bc..9ca57166e566c9f4310a6e6b2eb04660b268c4e4 100644
--- a/lib/src/codegen/code_generator.dart
+++ b/lib/src/codegen/code_generator.dart
@@ -129,18 +129,6 @@ abstract class CodeGenerator {
   CodeGenerator(String outDir, this.root, this.rules)
       : outDir = path.absolute(outDir);
 
-  // TODO(jmesserly): JS generates per library outputs, so it does not use this
-  // method and instead overrides generateLibrary.
-  void generateUnit(CompilationUnit unit, LibraryInfo info, String libraryDir) {
-  }
-
   void generateLibrary(Iterable<CompilationUnit> units, LibraryInfo info,
-      CheckerReporter reporter) {
-    for (var unit in units) {
-      var outputDir = makeOutputDirectory(info, unit);
-      reporter.enterSource(unit.element.source);
-      generateUnit(unit, info, outputDir);
-      reporter.leaveSource();
-    }
-  }
+      CheckerReporter reporter);
 }