feat(formfield): add formfield component

src/components/FormField/FormField.mdx

@@ -0,0 +1,67 @@
+---
+name: FormField
+menu: Components
+route: /form-field
+---
+
+import { Playground, Props } from 'docz';
+import { FormField, Input } from '../../index.ts';
+import styles from './docAssets/docs.module.css';
+
+# FormField
+
+This component is used to wrap around one or multiple form elements. The label describes the set of form elements. An error message can be set if the user did not interact correctly these elements.
+
+## Examples
+
+### Basic usage
+
+<Playground>
+  <FormField label='First name'>
+    <Input />
+  </FormField>
+</Playground>
+
+### FormField with error message
+
+<Playground>
+  <FormField label='Last name' errorMessage='This field contains the following illegal characters: ;'>
+    <Input value='Doe;' />
+  </FormField>
+</Playground>
+
+### FormField with hint
+
+<Playground>
+  <FormField label='MAC address' hint='The mac address is located at the back side of the device'>
+    <Input placeholder='00:00:00:00:00:00' />
+  </FormField>
+</Playground>
+
+### FormField with preview
+
+<Playground>
+  {() => {
+    const [hexColor, setHexColor] = React.useState('#03176b');
+    const [label, setLabel] = React.useState('Devops');
+    return (
+      <FormField
+        label='Custom label'
+        hint={
+          <span style={{backgroundColor: hexColor}} className={styles.label}>
+          {label}
+          </span>
+        }
+      >
+      <div className={styles.flexRow}>
+        <Input value={hexColor} onChange={event => setHexColor(event.target.value)} />
+        <Input value={label} onChange={event => setLabel(event.target.value)} />
+      </div>
+      </FormField>
+    );
+  }}
+</Playground>
+
+## API
+
+<Props of={FormField} />

src/components/FormField/FormField.module.css

@@ -0,0 +1,18 @@
+.label {
+  display: block;
+  margin-bottom: 10px;
+  font-weight: 500;
+  font-size: 15px;
+}
+
+.errorMessage {
+  display: block;
+  margin-top: 5px;
+  color: var(--color-error);
+}
+
+.hint {
+  display: block;
+  margin-top: 5px;
+  color: var(--color-neutral-6);
+}

src/components/FormField/FormField.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+
+import FormField from './FormField';
+
+describe('FormField', () => {
+  test('snapshot', () => {
+    const { asFragment } = render(<FormField>Form elements here</FormField>);
+    expect(asFragment()).toMatchSnapshot();
+  });
+
+  test('errorMessage should be rendered', () => {
+    const { queryByText } = render(
+      <FormField errorMessage="Something went wrong">Form elements here</FormField>,
+    );
+    expect(queryByText(/Something went wrong/)).not.toBe(null);
+  });
+
+  test('hint should be rendered', () => {
+    const { queryByText } = render(
+      <FormField hint={<span>You should look here</span>}>Form elements here</FormField>,
+    );
+    expect(queryByText(/You should look here/)).not.toBe(null);
+  });
+
+  test('className prop', () => {
+    const className = 'center';
+    const { getByText } = render(<FormField className={className}>Form elements here</FormField>);
+    const formFieldElement = getByText(/Form elements here/)!;
+
+    const renderedClassNames = formFieldElement.className.split(' ');
+    expect(renderedClassNames).toContain(className);
+    // className in prop should be the last in the row
+    expect(renderedClassNames.indexOf(className)).toBe(renderedClassNames.length - 1);
+  });
+});

src/components/FormField/FormField.tsx

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+import React, { ReactNode } from 'react';
+import classNames from 'classnames';
+
+import cssReset from '../../css-reset.module.css';
+import styles from './FormField.module.css';
+
+type Props = {
+  label?: string;
+  hint?: ReactNode;
+  errorMessage?: string;
+  className?: string;
+  children: ReactNode;
+};
+
+const FormField: React.FC<Props> = ({ label, className, children, hint, errorMessage }: Props) => {
+  const mergedClassNames = classNames(cssReset.ventura, className);
+  return (
+    <div className={mergedClassNames}>
+      {Boolean(label) && <span className={styles.label}>{label}</span>}
+      {children}
+      {Boolean(errorMessage) && <span className={styles.errorMessage}>{errorMessage}</span>}
+      {Boolean(hint) && <div className={styles.hint}>{hint}</div>}
+    </div>
+  );
+};
+
+export default FormField;

src/components/FormField/__snapshots__/FormField.test.tsx.snap

@@ -0,0 +1,11 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`FormField snapshot 1`] = `
+<DocumentFragment>
+  <div
+    class="ventura"
+  >
+    Form elements here
+  </div>
+</DocumentFragment>
+`;

src/components/FormField/docAssets/docs.module.css

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+.flexRow {
+  display: flex;
+}
+
+.flexRow > *:first-of-type {
+  width: 100px;
+  margin-right: 10px;
+}
+
+.label {
+  display: inline-block;
+  padding: 0 8px;
+  border-radius: 3px;
+  margin-top: 10px;
+  color: white;
+}

src/index.ts

@@ -4,4 +4,5 @@ export { default as Button } from './components/Button/Button';
 export { default as Input } from './components/Input/Input';
 export { default as Radio } from './components/Radio/Radio';
 export { default as Modal } from './components/Modal/Modal';
+export { default as FormField } from './components/FormField/FormField';
 export * from 'react-feather';