text: nullthrows()

in src/component/base/DraftEditor.react.js [298:371]
64 lines of code
9 McCabe index (conditional complexity)

        text: nullthrows(this.props.placeholder),
        textAlignment: this.props.textAlignment,
      };

      /* $FlowFixMe[incompatible-type] (>=0.112.0 site=www,mobile) This comment
       * suppresses an error found when Flow v0.112 was deployed. To see the
       * error delete this comment and run Flow. */
      return <DraftEditorPlaceholder {...placeHolderProps} />;
    }
    return null;
  }

  /**
   * returns ariaDescribedBy prop with EDITOR_ID_PLACEHOLDER replaced with
   * the DOM id of the placeholder (if it exists)
   * @returns aria-describedby attribute value
   */
  _renderARIADescribedBy(): ?string {
    const describedBy = this.props.ariaDescribedBy || '';
    if (this.props.placeholderAriaHidden) {
      return describedBy === EDITOR_ID_PLACEHOLDER ? undefined : describedBy;
    }
    const placeholderID = this._showPlaceholder()
      ? this._placeholderAccessibilityID
      : '';
    return (
      describedBy.replace(EDITOR_ID_PLACEHOLDER, placeholderID) || undefined
    );
  }

  render(): React.Node {
    const {
      blockRenderMap,
      blockRendererFn,
      blockStyleFn,
      customStyleFn,
      customStyleMap,
      editorState,
      preventScroll,
      readOnly,
      textAlignment,
      textDirectionality,
    } = this.props;

    const rootClass = cx({
      'DraftEditor/root': true,
      'DraftEditor/alignLeft': textAlignment === 'left',
      'DraftEditor/alignRight': textAlignment === 'right',
      'DraftEditor/alignCenter': textAlignment === 'center',
    });

    const contentStyle = {
      outline: 'none',
      // fix parent-draggable Safari bug. #1326
      userSelect: 'text',
      WebkitUserSelect: 'text',
      whiteSpace: 'pre-wrap',
      wordWrap: 'break-word',
    };

    // The aria-expanded and aria-haspopup properties should only be rendered
    // for a combobox.
    /* $FlowFixMe[prop-missing] (>=0.68.0 site=www,mobile) This comment
     * suppresses an error found when Flow v0.68 was deployed. To see the error
     * delete this comment and run Flow. */
    const ariaRole = this.props.role || 'textbox';
    const ariaExpanded =
      ariaRole === 'combobox' ? !!this.props.ariaExpanded : null;

    const editorContentsProps = {
      blockRenderMap,
      blockRendererFn,
      blockStyleFn,
      customStyleMap: {