Add:创建 flutter go web 版

packages/flutter_web_test/lib/src/nonconst.dart

@@ -0,0 +1,19 @@
+/// This function can be used to call a const constructor in such a way as to
+/// create a new instance rather than creating the common const instance.
+///
+/// ```dart
+/// class A {
+///   const A(this.i);
+///   int i;
+/// }
+///
+/// main () {
+///   // prevent prefer_const_constructors lint
+///   new A(nonconst(null));
+///
+///   // prevent prefer_const_declarations lint
+///   final int $null = nonconst(null);
+///   final A a = nonconst(const A(null));
+/// }
+/// ```
+T nonconst<T>(T t) => t;