message: feat(leadspace-centered): add option for button icons
diff: import React from 'react';
  import { storiesOf } from '@storybook/react';
  +import { ArrowRight20, ArrowDown20, Pdf20 } from '@carbon/icons-react';
  import {
  withKnobs,
  text,
  @@ -32,12 +33,12 @@ if (LEADSPACE_CENTERED) {
  {
  link: '',
  copy: 'Primary action button',
  - renderIcon: 'ArrowDown',
  + renderIcon: ArrowDown20,
  },
  {
  link: '',
  copy: 'Secondary action button',
  - renderIcon: 'ArrowRight',
  + renderIcon: ArrowRight20,
  },
  ];
  @@ -71,23 +72,31 @@ if (LEADSPACE_CENTERED) {
  const image = 'https://picsum.photos/id/1076/1056/480';
  + const iconMap = {
  + ArrowRight20,
  + ArrowDown20,
  + Pdf20,
  + };
  +
  const icons = {
  - ArrowRight: 'ArrowRight',
  - ArrowDown: 'ArrowDown',
  - Pdf: 'Pdf',
  - none: 'none',
  + ArrowRight: 'ArrowRight20',
  + ArrowDown: 'ArrowDown20',
  + Pdf: 'Pdf20',
  + none: null,
  };
  const buttons = [
  {
  link: '',
  copy: 'Primary action button',
  - renderIcon: select('primary button icon', icons, icons.ArrowRight),
  + renderIcon:
  + iconMap[select('primary button icon', icons, icons.ArrowRight)],
  },
  {
  link: '',
  copy: 'Secondary',
  - renderIcon: select('secondary button icon', icons, icons.ArrowRight),
  + renderIcon:
  + iconMap[select('secondary button icon', icons, icons.ArrowRight)],
  },
  ];
  