import {Recorder} from 'react-voice-recorder'
import 'react-voice-recorder/dist/index.css'

this.state = {
    audioDetails: {
        url: null,
        blob: null,
        chunks: null,
        duration: {
          h: 0,
          m: 0,
          s: 0
        }
      }
}
handleAudioStop(data){
    console.log(data)
    this.setState({ audioDetails: data });
}

handleAudioUpload(file) {
    console.log(file);
}

handleCountDown(data) {
    console.log(data);
}

handleReset() {
    const reset = {
      url: null,
      blob: null,
      chunks: null,
      duration: {
        h: 0,
        m: 0,
        s: 0
      }
    };
    this.setState({ audioDetails: reset });
  }

<Recorder
    record={true}
    title={"New recording"}
    audioURL={this.state.audioDetails.url}
    showUIAudio
    handleAudioStop={data => this.handleAudioStop(data)}
    handleAudioUpload={data => this.handleAudioUpload(data)}
    handleCountDown={data => this.handleCountDown(data)}
    handleReset={() => this.handleReset()}
    mimeTypeToUseWhenRecording={`audio/webm`} // For specific mimetype.
/>