ComposeEmailInput.jsx

  setValues = (v: string): void => {
    const lastChar = v.slice(-1);
    const isComma = lastChar === ',';
    const isSpace = lastChar === ' ';

    if (isComma || isSpace) {
      const delimiter = /,| /;
      const notEmptyText = text => text.length > 0;
      const emails = v
        .slice(0, -1)
        .split(delimiter)
        .filter(notEmptyText);
      const list = [...this.state.emailList, ...emails];

      this.setState({ emailList: list });
      this.inputRef.value = '';
      this.dispatchAction(list);
    }
  };