Gutenberg Custom Block for adding columns

hall-column-builder.js

/**
 * Custom Column control
 * Reference: https://github.com/WordPress/gutenberg/blob/master/packages/block-library/src/columns/index.js
 */

import { times } from 'lodash';
import classnames from 'classnames'
import memoize from 'memize';

/**
 * WordPress dependencies
 */

const { __ } = wp.i18n;
const { PanelBody, RangeControl, G, SVG, Path } = wp.components;
const { Fragment } = wp.element;
const { registerBlockType } = wp.blocks;
const { InspectorControls, InnerBlocks } = wp.editor;

/**
 * Allowed blocks constant is passed to InnerBlocks precisely as specified here.
 * The contents of the array should never be changed.
 * The array should contain the name of each block that we are allowing.
 * In columns block, the only block we are allowing is 'core/column'.
 *
 * @constant
 * @type {string[]}
 */

const ALLOWED_BLOCKS = [ 'core/column' ];

/**
 * Returns the layouts configuration for a given number of columns.
 *
 * @param {number} columns Number of columns.
 *
 * @return {object[]} Columns layout configuration.
 */

const getColumnsTemplate = memoize( (customColumns) => {
    return times( customColumns, () => [ 'core/column' ] );
} );


function hall_block_content_column() {
    registerBlockType( 'hallmark/custom-cloumn-builder', {
        title: 'Hallmark Column Buidler',
        icon: <SVG viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><Path fill="none" d="M0 0h24v24H0V0z" /><G><Path d="M4,4H20a2,2,0,0,1,2,2V18a2,2,0,0,1-2,2H4a2,2,0,0,1-2-2V6A2,2,0,0,1,4,4ZM4 6V18H8V6Zm6 0V18h4V6Zm6 0V18h4V6Z" /></G></SVG>,
        category: 'formatting',
        keywords: [
            __( 'Hallmark column builder' ),
            __( 'Custom column builder' ),
            __( 'Hall columns' )
        ],
        attributes: {
            columns: {
                type: 'number',
                default: 2
            }
        },
        description: __( 'Create multiple columns' ),
        supports: {
            align: [ 'wide', 'full' ],
            html: false
        },
        edit: function( props ) {

            const howManyColumns = props.attributes.columns;

            function onModifyColumnNumber( totalColumns ) {
                props.setAttributes( { columns: totalColumns } )
            }

            return(
                <Fragment>
                    <InspectorControls>
                        <PanelBody>
                            <RangeControl
                                label={ __( 'Columns' ) }
                                value={ howManyColumns }
                                onChange={ onModifyColumnNumber }
                                min={2}
                                max={6}
                            />
                        </PanelBody>
                    </InspectorControls>
                    <div className={props.className}>
                        <InnerBlocks
                            template={ getColumnsTemplate( howManyColumns ) }
                            allowedBlocks={ ALLOWED_BLOCKS }
                        />
                    </div>
                </Fragment>
            );
        },
        save: function ( props ) {
            return null;
        }
    } );
}

export default hall_block_content_column();

Watcher can't resolve memize in my above code. I have opened a help request at WordPress/gutenberg#13859