Deciding if browser supports typed arrays code

I see the following code in the compiled JS:

function isSupported_0(){

  isNull(compileTimeSupport) && (compileTimeSupport = new TypedArray$TypedArrayCompileTimeSupport_0);

  if (!$isSupported_0()) {

    return false;

  }

  return isSupportedRuntime_0();

}

However, i can't in the GWT source where this code is generated - could anyone help me with this?

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