スタイルガイド

// ❌ Bad, harder to read, harder to import with code completion
const MyComponent = () => {
  return <div>Hello World</div>;
};

export default MyComponent;

// ✅ Good, easy to read, easy to import with code completion
export function MyComponent() {
  return <div>Hello World</div>;
};

// ❌ Bad, no type
export const MyComponent = (props) => <div>Hello {props.name}</div>;

// ✅ Good, type
type MyComponentProps = {
  name: string;
};

export const MyComponent = ({ name }: MyComponentProps) => <div>Hello {name}</div>;

/* ❌ - Bad, defines the component type annotations with `FC`
 *    - With `React.FC`, the component implicitly accepts a `children` prop
 *      even if it's not defined in the prop type. This might not always be
 *      desirable, especially if the component doesn't intend to render
 *      children.
 */
const EmailField: React.FC<{
  value: string;
}> = ({ value }) => <TextInput value={value} disabled fullWidth />;

/* ✅ - Good, a separate type (OwnProps) is explicitly defined for the
 *      component's props
 *    - This method doesn't automatically include the children prop. If
 *      you want to include it, you have to specify it in OwnProps.
 */
type EmailFieldProps = {
  value: string;
};

const EmailField = ({ value }: EmailFieldProps) => (
  <TextInput value={value} disabled fullWidth />
);

/* ❌ - Bad, spreads a single variable prop into the underlying component
 */
const MyComponent = (props: OwnProps) => {
  return <OtherComponent {...props} />;
}

/* ✅ - Good, Explicitly lists all props
 *    - Enhances readability and maintainability
 */
const MyComponent = ({ prop1, prop2, prop3 }: MyComponentProps) => {
  return <OtherComponent {...{ prop1, prop2, prop3 }} />;
};

// ❌ Bad, can return 'default' even if value is 0 or ''
const value = process.env.MY_VALUE || 'default';

// ✅ Good, will return 'default' only if value is null or undefined
const value = process.env.MY_VALUE ?? 'default';

// ❌ Bad
onClick && onClick();

// ✅ Good
onClick?.();

// ❌ Bad
interface MyInterface {
  name: string;
}

// ✅ Good
type MyType = {
  name: string;
};

// ❌ Bad, utilizes an enum
enum Color {
  Red = "red",
  Green = "green",
  Blue = "blue",
}

let color = Color.Red;

// ✅ Good, utilizes a string literal

let color: "red" | "green" | "blue" = "red";

const {
  setHotkeyScopeAndMemorizePreviousScope,
  goBackToPreviousHotkeyScope,
} = usePreviousHotkeyScope();

setHotkeyScopeAndMemorizePreviousScope(
  RelationPickerHotkeyScope.RelationPicker,
);

// ❌ Bad
<div className="my-class">Hello World</div>

// ✅ Good
const StyledTitle = styled.div`
  color: red;
`;

// ❌ Bad
const Title = styled.div`
  color: red;
`;

// ✅ Good
const StyledTitle = styled.div`
  color: red;
`;

// ❌ Bad, directly specifies style values without utilizing the theme
const StyledButton = styled.button`
  color: #333333;
  font-size: 1rem;
  font-weight: 400;
  margin-left: 4px;
  border-radius: 50px;
`;

// ✅ Good, utilizes the theme
const StyledButton = styled.button`
  color: ${({ theme }) => theme.font.color.primary};
  font-size: ${({ theme }) => theme.font.size.md};
  font-weight: ${({ theme }) => theme.font.weight.regular};
  margin-left: ${({ theme }) => theme.spacing(1)};
  border-radius:  ${({ theme }) => theme.border.rounded};
`;

// ❌ Bad
import { type Meta, type StoryObj } from '@storybook/react';

// ❌ Bad
import type { Meta, StoryObj } from '@storybook/react';

// ✅ Good
import { Meta, StoryObj } from '@storybook/react';