New DateInput component

.changeset/chilly-dodos-end.md

@@ -1,5 +1,5 @@
 ---
-"@sumup-oss/circuit-ui": major
+'@sumup-oss/circuit-ui': major
 ---
 
-Upgraded to `@sumup-oss/intl` v2. If your app also depends on `@sumup-oss/intl` (previously called `@sumup/intl`), you need to upgrade it as well.
+Upgraded to `@sumup-oss/intl` v3. If your app also depends on `@sumup-oss/intl` (previously called `@sumup/intl`), you need to upgrade it as well.

.changeset/tiny-jars-knock.md

@@ -0,0 +1,5 @@
+---
+"@sumup-oss/circuit-ui": major
+---
+
+Rewrote the DateInput component and replaced the native date input with a custom implementation to improve its usability and accessibility. The component now requires additional localized label props.

.eslintrc.js

@@ -23,6 +23,9 @@ module.exports = require('@sumup-oss/foundry/eslint')({
     '@sumup-oss/circuit-ui/no-renamed-props': 'error',
     '@sumup-oss/circuit-ui/prefer-custom-properties': 'warn',
     'react/no-unknown-property': ['error', { ignore: ['css'] }],
+    // These rules are already covered by Biome
+    'jsx-a11y/click-events-have-key-events': 'off',
+    'jsx-a11y/no-static-element-interactions': 'off',
   },
   parserOptions: {
     project: ['./packages/*/tsconfig.json', './tsconfig.eslint.json'],

packages/circuit-ui/components/CurrencyInput/CurrencyInput.tsx

@@ -20,6 +20,7 @@ import { resolveCurrencyFormat } from '@sumup-oss/intl';
 import { NumericFormat, type NumericFormatProps } from 'react-number-format';
 
 import { clsx } from '../../styles/clsx.js';
+import { getBrowserLocale, type Locale } from '../../util/i18n.js';
 import { Input, type InputProps } from '../Input/index.js';
 
 import { formatPlaceholder } from './CurrencyInputService.js';
@@ -37,10 +38,12 @@ export interface CurrencyInputProps
    */
   currency: string;
   /**
-   * One or more Unicode BCP 47 locale identifiers, such as 'de-DE' or
-   * ['GB', 'en-US'] (the first supported locale is used).
+   * One or more [IETF BCP 47](https://en.wikipedia.org/wiki/IETF_language_tag)
+   * locale identifiers such as `'de-DE'` or `['GB', 'en-US']`.
+   * When passing an array, the first supported locale is used.
+   * Defaults to `navigator.language` in supported environments.
    */
-  locale?: string | string[];
+  locale?: Locale;
   /**
    * A short string that is shown inside the empty input.
    * If the placeholder is a number, it is formatted in the local
@@ -76,7 +79,7 @@ const DUMMY_DELIMITER = '?';
 export const CurrencyInput = forwardRef<HTMLInputElement, CurrencyInputProps>(
   (
     {
-      locale,
+      locale = getBrowserLocale(),
       currency,
       placeholder,
       'aria-describedby': descriptionId,

packages/circuit-ui/components/DateInput/DateInput.mdx

@@ -0,0 +1,55 @@
+import { Meta, Status, Props, Story } from '../../../../.storybook/components';
+import * as Stories from './DateInput.stories';
+
+<Meta of={Stories} />
+
+# DateInput
+
+<Status variant="stable" />
+
+The DateInput component allows users to type or select a specific date. The input value is always a string in the format `YYYY-MM-DD`.
+
+<Story of={Stories.Base} />
+<Props />
+
+## Usage
+
+Use the component whenever asking for a specific individual date such as a birth date, expiry date, or appointment date. The date is in the [ISO-8601](https://en.wikipedia.org/wiki/ISO_8601) format (`YYYY-MM-DD`).
+
+For selecting a range of dates, we expect to introduce an iteration of this component in the future. Until then, we recommend using a combination of two input fields (one for the start and the other for the end date).
+
+## Validations
+
+Use the `validationHint` prop to communicate the expected response to users. The DateInput component ensures that the entered date is a valid date, but does not validate whether it falls within the minimum or maximum date range.
+
+### Invalid
+
+The user needs to change the value to proceed. This could be because they entered a date outside of the allowed range.
+
+### Warning
+
+The user is recommended to change the value, but can proceed without doing so. Use it when the provided value could have unintended side-effects, such as a date in the far future.
+
+### Valid
+
+The user is reassured that the value is valid. Use sparingly.
+
+<Story of={Stories.Validations} />
+
+## Optional
+
+Use the `optionalLabel` prop to indicate that the field is optional. This can help reduce the cognitive load for the user by clearly indicating which fields are required and which are not. This label is only displayed when the `required` prop is falsy.
+
+<Story of={Stories.Optional} />
+
+## Readonly
+
+Use the `readOnly` prop to indicate that the field is not currently editable. This can be useful in situations where the user needs to view but not edit the date, such as in a summary or review screen.
+
+<Story of={Stories.Readonly} />
+
+## Internationalization
+
+Pass one or more [IETF BCP 47](https://en.wikipedia.org/wiki/IETF_language_tag) locale identifiers such as `'de-DE'` or `['GB', 'en-US']` to the `locale` prop to display the date in the local format. When passing an array, the first supported locale is used. Defaults to `navigator.language` in supported environments.
+
+<Story of={Stories.Locales} />