How to use the compromise function in compromise

export function parseTextForTopics(text) {
    // return(nlp(text).topics().out('topk'));
    return(nlp(text).topics().slice(0, 30).out('frequency'));
}

export function normalizeText(text) {
    return (nlp(text).normalize());
}

shared_text: {
        position: 'absolute',
        top: 0,
        left: 0,
        width: '100%',
        fontFamily: 'Helvetica',
        fontSize: 20,
        padding: '10px 15px 0px 15px',
        margin: 0,
        color: 'grey'
      }
    }
    this.state = {
      text: props.text,
      trailing: '',
      parsed: nlp(props.text)
    }
    this.overlay = this.overlay.bind(this)
    this.onChange = this.onChange.bind(this)
    this.hiddenText = this.hiddenText.bind(this)
  }

export function parseTextForDates(text) {
    return(nlp('text').dates().slice(0, 50).out('frequency'));
}

export function parseTextForPlaces(text) {
    return(nlp(text).places().slice(0, 50).out('frequency'));
}

export function parseTextForTrigrams(text) {
    return(nlp(text).ngrams().trigrams().slice(0, 30).out('frequency'));
}

onChange() {
    let {state} = this
    let el = this.refs.textarea
    if (el) {
      state.text = el.value
      state.parsed = nlp(state.text)
    }
    state.trailing = state.text.match(/\s+$/) || ''
    this.setState(state)
  }

export function parseTextForTerms(text) {
    return(filterCommonWords(nlp(text).terms().slice(0, 30).out('frequency')));
}

export function parseTextForBigrams(text) {
    return(nlp(text).ngrams().bigrams().slice(0, 30).out('frequency'));
}

export function parseTextForQuotes(text) {
    return(nlp(text).quotations().slice(0, 50).out('frequency'));
}