sort classes in dependency order, or load lazily if needed, fixes #78

test/codegen/expect/dart/_interceptors.js

 var _interceptors;
 (function(exports) {
   'use strict';
+  class Interceptor extends core.Object {
+    Interceptor() {
+    }
+    ['=='](other) {
+      return core.identical(this, other);
+    }
+    get hashCode() {
+      return _js_helper.Primitives.objectHashCode(this);
+    }
+    toString() {
+      return _js_helper.Primitives.objectToString(this);
+    }
+    noSuchMethod(invocation) {
+      throw new core.NoSuchMethodError(this, invocation.memberName, invocation.positionalArguments, invocation.namedArguments);
+    }
+    get runtimeType() {
+      return _js_helper.getRuntimeType(this);
+    }
+  }
   let JSArray$ = dart.generic(function(E) {
     class JSArray extends Interceptor {
       JSArray() {
         super.Interceptor();
       }
       JSArray$fixed(length) {
         if (dart.notNull(!(typeof length == number)) || dart.notNull(length) < 0) {
           throw new core.ArgumentError(`Length must be a non-negative integer: ${length}`);
         }
         return new JSArray.markFixed(new Array(length));
@@ skipping 1273 matching lines @@
     let constructorFn = constructorMap[name];
     return constructorFn;
   }
   // Function findInterceptorForType: (Type) → dynamic
   function findInterceptorForType(type) {
     let constructor = findInterceptorConstructorForType(type);
     if (constructor === null)
       return null;
     return constructor.prototype;
   }
-  class Interceptor extends core.Object {
-    Interceptor() {
-    }
-    ['=='](other) {
-      return core.identical(this, other);
-    }
-    get hashCode() {
-      return _js_helper.Primitives.objectHashCode(this);
-    }
-    toString() {
-      return _js_helper.Primitives.objectToString(this);
-    }
-    noSuchMethod(invocation) {
-      throw new core.NoSuchMethodError(this, invocation.memberName, invocation.positionalArguments, invocation.namedArguments);
-    }
-    get runtimeType() {
-      return _js_helper.getRuntimeType(this);
-    }
-  }
   class JSBool extends Interceptor {
     JSBool() {
       super.Interceptor();
     }
     toString() {
       return String(this);
     }
     get hashCode() {
       return this ? 2 * 3 * 23 * 3761 : 269 * 811;
     }
@@ skipping 47 matching lines @@
     UnknownJavaScriptObject() {
       super.JavaScriptObject();
     }
     toString() {
       return String(this);
     }
   }
   // Exports:
   exports.JSArray = JSArray;
   exports.JSArray$ = JSArray$;
+  exports.Interceptor = Interceptor;
   exports.JSMutableArray = JSMutableArray;
   exports.JSMutableArray$ = JSMutableArray$;
   exports.JSFixedArray = JSFixedArray;
   exports.JSFixedArray$ = JSFixedArray$;
   exports.JSExtendableArray = JSExtendableArray;
   exports.JSExtendableArray$ = JSExtendableArray$;
   exports.JSNumber = JSNumber;
   exports.JSInt = JSInt;
   exports.JSDouble = JSDouble;
   exports.JSPositiveInt = JSPositiveInt;
   exports.JSUInt32 = JSUInt32;
   exports.JSUInt31 = JSUInt31;
   exports.JSString = JSString;
   exports.getInterceptor = getInterceptor;
   exports.getDispatchProperty = getDispatchProperty;
   exports.setDispatchProperty = setDispatchProperty;
   exports.makeDispatchRecord = makeDispatchRecord;
   exports.dispatchRecordInterceptor = dispatchRecordInterceptor;
   exports.dispatchRecordProto = dispatchRecordProto;
   exports.dispatchRecordExtension = dispatchRecordExtension;
   exports.dispatchRecordIndexability = dispatchRecordIndexability;
   exports.getNativeInterceptor = getNativeInterceptor;
   exports.mapTypeToInterceptor = mapTypeToInterceptor;
   exports.findIndexForNativeSubclassType = findIndexForNativeSubclassType;
   exports.findInterceptorConstructorForType = findInterceptorConstructorForType;
   exports.findConstructorForNativeSubclassType = findConstructorForNativeSubclassType;
   exports.findInterceptorForType = findInterceptorForType;
-  exports.Interceptor = Interceptor;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors || (_interceptors = {}));