1. @DomName('AnalyserNode.getFloatFrequencyData')
  2. @DocsEditable()
void getFloatFrequencyData(Float32List array)

Source 

@DomName('AnalyserNode.getFloatFrequencyData')
@DocsEditable()
void getFloatFrequencyData(Float32List array) =>
    _blink.BlinkAnalyserNode.instance
        .getFloatFrequencyData_Callback_1_(this, array);