Separating a Cascade in Dart


I’m seeing some weird behavior in Dart. My goal is to only serve static assets if a build/web Dir exists.

1- The following works:

Cascade cc;
if(new Directory(buildPath).existsSync() )
  cc = new Cascade().add(apiHandler).add(fHandler);
} else {
  cc = new Cascade().add(apiHandler);

2- The following does not work:

  Cascade cc = new Cascade().add(apiHandler);
  if( new Directory(buildPath).existsSync() )

Question: The example in scenario 1 works fine. In the second example, when i add fHandler, how come none of its associated routes ever get handled?


The Cascade class is immutable so the add method returns a new instance. Your second code block is assuming the current instance is modified

You need to add the cc =

cc = cc.add(..)

Answered By – Anders

Answer Checked By – Mary Flores (FlutterFixes Volunteer)

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