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React Skills – DynamoHome

Component rules

Always use functional components:

// ✅
export const MyComponent = ({ title }: MyComponentProps) => <div>{title}</div>;

// ❌ Never
export class MyComponent extends React.Component { ... }

Define explicit prop interfaces:

// ✅
interface GraphGridItemProps {
  name: string;
  path: string;
  onOpen: (path: string) => void;
}
export const GraphGridItem = ({ name, path, onOpen }: GraphGridItemProps) => { ... };

// ❌
export const GraphGridItem = ({ name, path, onOpen }: any) => { ... };

CSS Modules — mandatory:

import styles from './GraphGridItem.module.css';
// Access with bracket notation
<div className={styles['graph-item']}>
// ❌ Never global class names or inline styles
<div className="graph-item">
<div style={{ color: 'red' }}>

State management

• Component-level state: useState
• Shared user preferences: useSettings() hook (wraps SettingsContext)
• No external state libraries — Context API only

import { useSettings } from '../SettingsContext';
const { recentPageViewMode, setRecentPageViewMode } = useSettings();

Hooks

• Use built-in hooks: useState, useEffect, useCallback, useMemo, useRef, useContext
• Consume context via useSettings() — do not use useContext(SettingsContext) directly
• Use useIntl() from react-intl when you need a string value (not JSX)

Approved libraries — do not add others

Library	Usage
react-intl	<FormattedMessage>, useIntl()
react-table	useTable() hook in GraphTable and SamplesTable
react-split-pane	<SplitPane> in LayoutContainer

Folder placement

Component type	Location
Used by one module	src/components/[Module]/
Used by 2+ modules	src/components/Common/
App-level	src/components/ (LayoutContainer, MainContent, SettingsContext)

What NOT to do

• Do not add Redux, Zustand, Recoil, MobX, Jotai, or any state management library
• Do not add component libraries (Material UI, Ant Design, Chakra, shadcn, etc.)
• Do not use React.FC type — prefer explicit prop interfaces with arrow function components
• Do not use React.memo, React.lazy, or Suspense unless explicitly requested
• Do not use any for prop types, state, or return types in new code