emit interfaces before use

lib/runtime/dart/_interceptors.js

Index: lib/runtime/dart/_interceptors.js
diff --git a/lib/runtime/dart/_interceptors.js b/lib/runtime/dart/_interceptors.js
index c410d949489914b237f3eb5d1f95ee31cca958fd..028123b717197d55286dfd0b039ab99ce661f9b6 100644
--- a/lib/runtime/dart/_interceptors.js
+++ b/lib/runtime/dart/_interceptors.js
@@ -20,6 +20,7 @@ var _interceptors;
       return _js_helper.getRuntimeType(this);
     }
   }
+  class JSIndexable extends core.Object {}
   let JSArray$ = dart.generic(function(E) {
     class JSArray extends Interceptor {
       JSArray() {
@@ -355,22 +356,20 @@ var _interceptors;
     return JSArray;
   });
   let JSArray = JSArray$(dart.dynamic);
+  class JSMutableIndexable extends JSIndexable {}
   let JSMutableArray$ = dart.generic(function(E) {
-    class JSMutableArray extends JSArray$(E) {
-    }
+    class JSMutableArray extends JSArray$(E) {}
     JSMutableArray[dart.implements] = [JSMutableIndexable];
     return JSMutableArray;
   });
   let JSMutableArray = JSMutableArray$(dart.dynamic);
   let JSFixedArray$ = dart.generic(function(E) {
-    class JSFixedArray extends JSMutableArray$(E) {
-    }
+    class JSFixedArray extends JSMutableArray$(E) {}
     return JSFixedArray;
   });
   let JSFixedArray = JSFixedArray$(dart.dynamic);
   let JSExtendableArray$ = dart.generic(function(E) {
-    class JSExtendableArray extends JSMutableArray$(E) {
-    }
+    class JSExtendableArray extends JSMutableArray$(E) {}
     return JSExtendableArray;
   });
   let JSExtendableArray = JSExtendableArray$(dart.dynamic);
@@ -764,12 +763,9 @@ var _interceptors;
     }
   }
   JSDouble[dart.implements] = [core.double];
-  class JSPositiveInt extends JSInt {
-  }
-  class JSUInt32 extends JSPositiveInt {
-  }
-  class JSUInt31 extends JSUInt32 {
-  }
+  class JSPositiveInt extends JSInt {}
+  class JSUInt32 extends JSPositiveInt {}
+  class JSUInt31 extends JSUInt32 {}
   let _defaultSplit = Symbol('_defaultSplit');
   let _isWhitespace = Symbol('_isWhitespace');
   let _skipLeadingWhitespace = Symbol('_skipLeadingWhitespace');
@@ -1365,12 +1361,7 @@ var _interceptors;
     }
   }
   JSNull[dart.implements] = [core.Null];
-  class JSIndexable extends core.Object {
-  }
-  class JSMutableIndexable extends JSIndexable {
-  }
-  class JSObject extends core.Object {
-  }
+  class JSObject extends core.Object {}
   class JavaScriptObject extends Interceptor {
     JavaScriptObject() {
       super.Interceptor();
@@ -1400,8 +1391,10 @@ var _interceptors;
   exports.JSArray = JSArray;
   exports.JSArray$ = JSArray$;
   exports.Interceptor = Interceptor;
+  exports.JSIndexable = JSIndexable;
   exports.JSMutableArray = JSMutableArray;
   exports.JSMutableArray$ = JSMutableArray$;
+  exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSFixedArray = JSFixedArray;
   exports.JSFixedArray$ = JSFixedArray$;
   exports.JSExtendableArray = JSExtendableArray;
@@ -1428,8 +1421,6 @@ var _interceptors;
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
-  exports.JSIndexable = JSIndexable;
-  exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;