Strict TypeScript API & Safe Component Contracts

Understand Strict TypeScript API & Safe Component Contracts as part of a React Native 0.87 system connecting React 19.2, Hermes V1, Fabric, TurboModules, and the Strict TypeScript API. Keep the boundary between shared TypeScript and platform-specific native behavior explicit.

Build a Complete Mental Model

Understand Strict TypeScript API & Safe Component Contracts as part of a React Native 0.87 system connecting React 19.2, Hermes V1, Fabric, TurboModules, and the Strict TypeScript API. Keep the boundary between shared TypeScript and platform-specific native behavior explicit.

Apply It in Production React Native

Test an original Strict TypeScript API & Safe Component Contracts example on Android and iOS with small and large screens, font scaling, dark mode, keyboard and screen reader use, slow/offline networking, denied permissions, and background/foreground transitions. Use DevTools, tests, and a release build where relevant.

After This Lesson

• Explain the shared-code and platform boundary
• Build an example with loading, error, and accessibility states
• Verify one Android/iOS behavior with a test or profiler

import { useRef } from 'react';
import { TextInput, type TextInputInstance } from 'react-native';

type SearchProps = {
  value: string;
  onChange: (value: string) => void;
};

export function Search({ value, onChange }: SearchProps) {
  const ref = useRef<TextInputInstance>(null);
  return <TextInput
    ref={ref}
    value={value}
    onChangeText={onChange}
    accessibilityLabel="Search tasks"
  />;
}

Root imports and generated React Native types validate the component contract.

React Native 0.87 Release — React Native