@atlaskit/button/dist/es2019/new-button/variants/shared/icon-renderer.js

A button triggers an event or action. They let users know what will happen next.

import React from 'react';
import { fg } from '@atlaskit/platform-feature-flags/fg';
function isIconRenderProp(func) {
  return !func.displayName &&
  // most function components and class components have a displayName, negate them
  !func.render &&
  // forwardRef doesn't require a display name, however it does include a render function, negate them
  typeof func === 'function' // at the very least we need to be a function
  ;
}

/**
 * How far an icon can move past its box before it reaches the border of the button, which is the
 * space around the icon in the button minus the width of the border, so that the icon doesn't go
 * over the border. Passed to icon render props so that, for example, `IconMotion` can use it as its
 * `overshoot`. These are worked out once here, as every icon in every button goes through this file.
 */
const OVERSHOOT_DEFAULT = `calc(${"var(--ds-space-100, 8px)"} - ${"var(--ds-border-width, 1px)"})`;
const OVERSHOOT_COMPACT = `calc(${"var(--ds-space-050, 4px)"} - ${"var(--ds-border-width, 1px)"})`;
const getOvershoot = spacing => spacing === 'compact' ? OVERSHOOT_COMPACT : OVERSHOOT_DEFAULT;

/**
 * __Icon renderer__
 *
 * Used to support render props with icons.
 *
 */
const IconRenderer = ({
  icon: Icon,
  spacing
}) => {
  // React Compiler opt-out: RC-incompatible (memoization breaks runtime behaviour).
  'use no memo';

  const isRenderProp = isIconRenderProp(Icon);
  let iconProps = {
    label: '',
    color: 'currentColor',
    size: fg('platform_dst_button_chevron_sizing') ? iconName => iconName.startsWith('Chevron') ? 'small' : 'medium' : undefined
  };

  // Only a render prop can use `motionOvershoot`, so an icon component doesn't get it
  const icon = isRenderProp ? Icon({
    ...iconProps,
    motionOvershoot: getOvershoot(spacing)
  }) : /*#__PURE__*/React.createElement(Icon, iconProps);

  // @ts-expect-error -- The render-prop guard returns IconProp (a component type), which is not a ReactNode.
  return /*#__PURE__*/React.createElement(React.Fragment, null, icon);
};
export default IconRenderer;