refactor(components): rewrite Button and ButtonLink components

Both:
* move styles to Sass placeholders

Button:
* add `isPressed` prop to Button
* add `isLoading` prop to Button (to differentiate state from
disabled)

ButtonLink:
* replace `external` prop with `isExternal` prop
* replace `href` prop with `to` prop

7 files changed, 69 insertions, 56 deletions

diff --git a/src/components/molecules/buttons/back-to-top.module.scss b/src/components/molecules/buttons/back-to-top.module.scss
index f5b3acd..7eae03b 100644
--- a/src/components/molecules/buttons/back-to-top.module.scss
+++ b/src/components/molecules/buttons/back-to-top.module.scss
@@ -4,6 +4,7 @@
   .link {
     width: clamp(#{fun.convert-px(48)}, 8vw, #{fun.convert-px(55)});
     height: clamp(#{fun.convert-px(48)}, 8vw, #{fun.convert-px(55)});
+    padding: 0;
 
     svg {
       width: 100%;
@@ -18,7 +19,9 @@
       .arrow-bar {
         opacity: 0;
         transform: translateY(30%) scaleY(0);
-        transition: transform 0.45s ease-in-out 0s, opacity 0.1s linear 0.2s;
+        transition:
+          transform 0.45s ease-in-out 0s,
+          opacity 0.1s linear 0.2s;
       }
     }
 
diff --git a/src/components/molecules/buttons/back-to-top.stories.tsx b/src/components/molecules/buttons/back-to-top.stories.tsx
index 5de12d4..40acd33 100644
--- a/src/components/molecules/buttons/back-to-top.stories.tsx
+++ b/src/components/molecules/buttons/back-to-top.stories.tsx
@@ -1,4 +1,4 @@
-import { ComponentMeta, ComponentStory } from '@storybook/react';
+import type { ComponentMeta, ComponentStory } from '@storybook/react';
 import { BackToTop as BackToTopComponent } from './back-to-top';
 
 /**
@@ -21,7 +21,7 @@ export default {
         required: false,
       },
     },
-    target: {
+    to: {
       control: {
         type: 'text',
       },
@@ -43,5 +43,5 @@ const Template: ComponentStory<typeof BackToTopComponent> = (args) => (
  */
 export const BackToTop = Template.bind({});
 BackToTop.args = {
-  target: 'top',
+  to: 'top',
 };
diff --git a/src/components/molecules/buttons/back-to-top.test.tsx b/src/components/molecules/buttons/back-to-top.test.tsx
index aaae3ef..a775841 100644
--- a/src/components/molecules/buttons/back-to-top.test.tsx
+++ b/src/components/molecules/buttons/back-to-top.test.tsx
@@ -1,11 +1,14 @@
 import { describe, expect, it } from '@jest/globals';
-import { render, screen } from '../../../../tests/utils';
+import { render, screen as rtlScreen } from '../../../../tests/utils';
 import { BackToTop } from './back-to-top';
 
 describe('BackToTop', () => {
   it('renders a BackToTop link', () => {
-    render(<BackToTop target="top" />);
-    expect(screen.getByRole('link')).toHaveAccessibleName('Back to top');
-    expect(screen.getByRole('link')).toHaveAttribute('href', '#top');
+    const id = 'top';
+
+    render(<BackToTop to={id} />);
+
+    expect(rtlScreen.getByRole('link')).toHaveAccessibleName('Back to top');
+    expect(rtlScreen.getByRole('link')).toHaveAttribute('href', `#${id}`);
   });
 });
diff --git a/src/components/molecules/buttons/back-to-top.tsx b/src/components/molecules/buttons/back-to-top.tsx
index d28d6c1..6ca6f10 100644
--- a/src/components/molecules/buttons/back-to-top.tsx
+++ b/src/components/molecules/buttons/back-to-top.tsx
@@ -1,13 +1,13 @@
-import { FC } from 'react';
+import type { FC, HTMLAttributes } from 'react';
 import { useIntl } from 'react-intl';
-import { Arrow, ButtonLink, type ButtonLinkProps } from '../../atoms';
+import { Arrow, ButtonLink } from '../../atoms';
 import styles from './back-to-top.module.scss';
 
-export type BackToTopProps = Pick<ButtonLinkProps, 'target'> & {
+export type BackToTopProps = HTMLAttributes<HTMLDivElement> & {
   /**
-   * Set additional classnames to the button wrapper.
+   * Define the element id to us as anchor.
    */
-  className?: string;
+  to: string;
 };
 
 /**
@@ -15,23 +15,31 @@ export type BackToTopProps = Pick<ButtonLinkProps, 'target'> & {
  *
  * Render a back to top link.
  */
-export const BackToTop: FC<BackToTopProps> = ({ className = '', target }) => {
+export const BackToTop: FC<BackToTopProps> = ({
+  className = '',
+  to,
+  ...props
+}) => {
   const intl = useIntl();
   const linkName = intl.formatMessage({
     defaultMessage: 'Back to top',
     description: 'BackToTop: link text',
     id: 'm+SUSR',
   });
+  const btnClass = `${styles.wrapper} ${className}`;
+  const anchor = `#${to}`;
 
   return (
-    <div className={`${styles.wrapper} ${className}`}>
+    <div {...props} className={btnClass}>
       <ButtonLink
-        shape="square"
-        target={`#${target}`}
         aria-label={linkName}
         className={styles.link}
+        // eslint-disable-next-line react/jsx-no-literals -- Shape allowed
+        shape="square"
+        to={anchor}
       >
-        <Arrow aria-hidden={true} direction="top" />
+        {/* eslint-disable-next-line react/jsx-no-literals -- Direction allowed */}
+        <Arrow aria-hidden direction="top" />
       </ButtonLink>
     </div>
   );
diff --git a/src/components/molecules/buttons/help-button.tsx b/src/components/molecules/buttons/help-button.tsx
index 1234835..7a01b14 100644
--- a/src/components/molecules/buttons/help-button.tsx
+++ b/src/components/molecules/buttons/help-button.tsx
@@ -1,11 +1,11 @@
-import { forwardRef, ForwardRefRenderFunction } from 'react';
+import { forwardRef, type ForwardRefRenderFunction } from 'react';
 import { useIntl } from 'react-intl';
 import { Button, type ButtonProps } from '../../atoms';
 import styles from './help-button.module.scss';
 
 export type HelpButtonProps = Pick<
   ButtonProps,
-  'aria-pressed' | 'className' | 'onClick'
+  'className' | 'isPressed' | 'onClick'
 >;
 
 const HelpButtonWithRef: ForwardRefRenderFunction<
diff --git a/src/components/molecules/layout/card.tsx b/src/components/molecules/layout/card.tsx
index c342d0e..f39a430 100644
--- a/src/components/molecules/layout/card.tsx
+++ b/src/components/molecules/layout/card.tsx
@@ -1,9 +1,9 @@
-import { FC } from 'react';
-import { type Image } from '../../../types';
+import type { FC } from 'react';
+import type { Image as Img } from '../../../types';
 import { ButtonLink, Heading, type HeadingLevel } from '../../atoms';
 import { ResponsiveImage } from '../images';
-import { Meta, type MetaData } from './meta';
 import styles from './card.module.scss';
+import { Meta, type MetaData } from './meta';
 
 export type CardProps = {
   /**
@@ -13,7 +13,7 @@ export type CardProps = {
   /**
    * The card cover.
    */
-  cover?: Image;
+  cover?: Img;
   /**
    * The card id.
    */
@@ -55,29 +55,32 @@ export const Card: FC<CardProps> = ({
   titleLevel,
   url,
 }) => {
+  const cardClass = `${styles.wrapper} ${className}`;
+  const headingId = `${id}-heading`;
+
   return (
-    <ButtonLink
-      aria-labelledby={`${id}-heading`}
-      className={`${styles.wrapper} ${className}`}
-      target={url}
-    >
+    <ButtonLink aria-labelledby={headingId} className={cardClass} to={url}>
       <article className={styles.article}>
         <header className={styles.header}>
-          {cover && <ResponsiveImage {...cover} className={styles.cover} />}
+          {cover ? (
+            <ResponsiveImage {...cover} className={styles.cover} />
+          ) : null}
           <Heading
+            // eslint-disable-next-line react/jsx-no-literals -- Hardcoded config
             alignment="center"
             className={styles.title}
-            id={`${id}-heading`}
+            id={headingId}
             level={titleLevel}
           >
             {title}
           </Heading>
         </header>
-        {tagline && <div className={styles.tagline}>{tagline}</div>}
-        {meta && (
+        {tagline ? <div className={styles.tagline}>{tagline}</div> : null}
+        {meta ? (
           <footer className={styles.footer}>
             <Meta
               data={meta}
+              // eslint-disable-next-line react/jsx-no-literals -- Hardcoded config
               layout="inline"
               className={styles.list}
               groupClassName={styles.meta__item}
@@ -85,7 +88,7 @@ export const Card: FC<CardProps> = ({
               valueClassName={styles.meta__value}
             />
           </footer>
-        )}
+        ) : null}
       </article>
     </ButtonLink>
   );
diff --git a/src/components/molecules/nav/pagination.tsx b/src/components/molecules/nav/pagination.tsx
index 6fa69f0..27ef1ec 100644
--- a/src/components/molecules/nav/pagination.tsx
+++ b/src/components/molecules/nav/pagination.tsx
@@ -1,4 +1,5 @@
-import { FC, Fragment, ReactNode } from 'react';
+/* eslint-disable max-statements */
+import { type FC, Fragment, type ReactNode } from 'react';
 import { useIntl } from 'react-intl';
 import { ButtonLink } from '../../atoms';
 import styles from './pagination.module.scss';
@@ -78,11 +79,8 @@ export const Pagination: FC<PaginationProps> = ({
    * @param {number} end - The last value.
    * @returns {number[]} An array from start value to end value.
    */
-  const range = (start: number, end: number): number[] => {
-    const length = end - start + 1;
-
-    return Array.from({ length }, (_, index) => index + start);
-  };
+  const range = (start: number, end: number): number[] =>
+    Array.from({ length: end - start + 1 }, (_, index) => index + start);
 
   /**
    * Get the pagination range.
@@ -138,21 +136,17 @@ export const Pagination: FC<PaginationProps> = ({
   const getItem = (id: string, body: ReactNode, link?: string): JSX.Element => {
     const linkModifier = id.startsWith('page') ? 'link--number' : '';
     const kind = id === 'previous' || id === 'next' ? 'tertiary' : 'secondary';
+    const linkClass = `${styles.link} ${styles[linkModifier]}`;
+    const disabledLinkClass = `${styles.link} ${styles['link--disabled']}`;
 
     return (
       <li className={styles.item}>
         {link ? (
-          <ButtonLink
-            kind={kind}
-            target={link}
-            className={`${styles.link} ${styles[linkModifier]}`}
-          >
+          <ButtonLink className={linkClass} kind={kind} to={link}>
             {body}
           </ButtonLink>
         ) : (
-          <span className={`${styles.link} ${styles['link--disabled']}`}>
-            {body}
-          </span>
+          <span className={disabledLinkClass}>{body}</span>
         )}
       </li>
     );
@@ -187,6 +181,7 @@ export const Pagination: FC<PaginationProps> = ({
               {
                 number: page,
                 a11y: (chunks: ReactNode) => (
+                  // eslint-disable-next-line react/jsx-no-literals
                   <span className="screen-reader-text">
                     {page === currentPage && currentPagePrefix}
                     {chunks}
@@ -199,19 +194,20 @@ export const Pagination: FC<PaginationProps> = ({
           ? undefined
           : `${baseUrl}${page}`;
 
-      return <Fragment key={`item-${id}`}>{getItem(id, body, url)}</Fragment>;
+      return <Fragment key={id}>{getItem(id, body, url)}</Fragment>;
     });
   };
+  const navClass = `${styles.wrapper} ${className}`;
+  const listClass = `${styles.list} ${styles['list--pages']}`;
 
   return (
-    <nav {...props} className={`${styles.wrapper} ${className}`}>
-      <ul className={`${styles.list} ${styles['list--pages']}`}>
-        {getPages(current, totalPages)}
-      </ul>
+    <nav {...props} className={navClass}>
+      <ul className={listClass}>{getPages(current, totalPages)}</ul>
       <ul className={styles.list}>
-        {hasPreviousPage &&
-          getItem('previous', previousPageName, previousPageUrl)}
-        {hasNextPage && getItem('next', nextPageName, nextPageUrl)}
+        {hasPreviousPage
+          ? getItem('previous', previousPageName, previousPageUrl)
+          : null}
+        {hasNextPage ? getItem('next', nextPageName, nextPageUrl) : null}
       </ul>
     </nav>
   );