Migrate To Strict API

Migrate to Strict TypeScript API

Migrate a React Native project to the Strict TypeScript API — auto-generated TypeScript types, scoped to react-native's root exports. The Strict API is the default from React Native 0.87, and an opt-in preview on 0.80–0.86.

This migration affects TypeScript analysis only. Nothing changes in the bundle or at runtime, so it is safe to apply incrementally and there is no shipping risk.

Invocation

/migrate-to-strict-api

Step-by-step procedure

Follow every step below in order. Do not skip steps.

1. Verify prerequisites

• Read package.json and confirm the react-native version is >= 0.80. If not, stop and tell the user to upgrade first. Record whether the version is >= 0.87 — this decides steps 3 and 5.
• Confirm tsconfig.json exists.
• Confirm node_modules/react-native/types_generated/index.d.ts exists. If not, tell the user to run their package manager install first.

2. Update dependencies

Some libraries ship raw TypeScript source that is type-checked as part of the user's project — most commonly Jest mock entry points imported from a setup file. Under the Strict API these produce errors located under node_modules, typically TS2307: Cannot find module 'react-native/Libraries/...', which the user cannot fix in their own code.

• Confirm skipLibCheck is enabled (@react-native/typescript-config sets it). Do not disable it.
• Whenever type errors are located under node_modules/<package> — at any point in this migration — update that package first, checking its releases for a Strict API compatibility fix. Known fixed versions are listed in references/library-compatibility.md.
• If no fixed release exists, apply a local fix by redirecting the imported subpath to an untyped stub, and tell the user to report the incompatibility to the library:

{
  "compilerOptions": {
    "paths": {
      "some-library/jest/mock": ["./untyped-module.d.ts"]
    }
  }
}

// untyped-module.d.ts
declare const anyExport: unknown;
export default anyExport;

An inline @ts-ignore does not work for this case — the errors are reported inside the library's files, not at the import site.

3. Enable the Strict API in tsconfig.json

React Native >= 0.87 — the Strict API is the default:

• If compilerOptions.customConditions contains "react-native-legacy-deep-imports", remove that entry (it is the temporary opt-out, due for removal in a future release), keeping "react-native" in place.
• Otherwise, no config change is needed.

React Native 0.80–0.86 — opt in:

• Add "customConditions": ["react-native", "react-native-strict-api"] to compilerOptions. Both entries are required: customConditions replaces (not merges with) the value from an extended config, so omitting "react-native" drops the standard condition set by @react-native/typescript-config and breaks module resolution for packages that key on it. The project must use "moduleResolution": "bundler" (or "node16" / "nodenext") for custom conditions to take effect.

4. Fix deep imports

4a. Run the ESLint autofix first

@react-native/eslint-plugin ships a no-deep-imports rule with a code autofixer that rewrites known deep imports (default and type imports) to root imports. If the plugin is installed — it is bundled with @react-native/eslint-config — enable the rule in the project's ESLint config:

{"@react-native/no-deep-imports": "error"}

Then run ESLint with --fix across the project source. Recommend keeping the rule enabled afterwards to prevent regressions.

4b. Manual pass for the remainder

Read node_modules/react-native/types_generated/index.d.ts. This file is the source of truth for every export available under the Strict API. Each line maps an internal source path to an exported name:

export { default as Alert } from "./Libraries/Alert/Alert";
export type { AlertButton } from "./Libraries/Alert/Alert";

Parse this file to build two mappings:

• Value exports: internal path + original name → exported name (e.g. ./Libraries/Alert/Alert default → Alert)
• Type exports: internal path → list of exported type names (e.g. ./Libraries/Alert/Alert → AlertType, AlertButton, ...)

Search all source files (.ts, .tsx, .js, .jsx) for remaining imports from react-native/Libraries/... or react-native/src/... subpaths, and rewrite each using the mapping:

When a file already has a react-native root import, merge into it rather than adding a duplicate.

Codegen imports move to the CodegenTypes namespace:

// Before
import codegenNativeComponent from 'react-native/Libraries/Utilities/codegenNativeComponent';
import codegenNativeCommands from 'react-native/Libraries/Utilities/codegenNativeCommands';
import type {Int32, WithDefault} from 'react-native/Libraries/Types/CodegenTypes';

// After
import {codegenNativeComponent, codegenNativeCommands} from 'react-native';
import type {CodegenTypes} from 'react-native';

// Usage changes: Int32 → CodegenTypes.Int32, WithDefault<...> → CodegenTypes.WithDefault<...>

InitializeCore is a side-effect entry point with no root export — replace it with the dedicated subpath (usually found in Jest setup files and custom entry points):

- import 'react-native/Libraries/Core/InitializeCore';
+ import 'react-native/setup-env';

If a deep import path does not appear in the mapping, it is intentionally private. Look for a root-API alternative; if none covers the use case, flag it to the user and point them to the feedback thread. Note that react-native/src/private/* imports are also removed at runtime in 0.87 — those usages must be removed, not just retyped.

4c. Leave Jest string mocks alone

Do not rewrite jest.mock('react-native/Libraries/...') or jest.requireActual(...) path strings. Module resolution in Jest and Metro is unchanged — these keep working, and TypeScript does not check them. Only when a test file imports a deep path as a module does TypeScript error; where no root export covers the use case, keep the import and suppress the error explicitly:

// @ts-expect-error - React Native internal, untyped under the Strict API
import NativeAppState from 'react-native/Libraries/AppState/NativeAppState';

5. Run typecheck and fix remaining type errors

Run npx tsc --noEmit. Fix errors iteratively using these known patterns:

Component ref and instance types

Core components are now typed as function components, so a component name no longer works as an instance type (useRef<TextInput> refers to the component function, and methods like .focus() appear missing). This is the most common blocker.

• On 0.87+, use the dedicated *Instance types — every ref-supporting core component exports one (ViewInstance, TextInputInstance, ScrollViewInstance, FlatListInstance, ...). Components without ref support have no instance type: InputAccessoryView, TouchableWithoutFeedback, experimental_LayoutConformance.
• On 0.80–0.86, use React.ComponentRef<typeof Component> — it resolves the same instance type and works under both the Strict API and the legacy types.

// Before
const inputRef = useRef<TextInput>(null);

// After (0.87+) — preferred
const inputRef = useRef<TextInputInstance>(null);

// After (any version) — equivalent
const inputRef = useRef<React.ComponentRef<typeof TextInput>>(null);

Apply this everywhere a component name is used as an instance type: useRef / createRef type arguments, ref props on wrapper components (ref?: React.Ref<ViewInstance>), React.forwardRef<View, Props> type arguments, and variables holding instances.

Related replacements:

• Animated.LegacyRef<View> is removed — use the plain *Instance type; *Instance types work transparently with Animated.* component variants.
• NativeMethods / NativeMethodsMixin are removed — use HostInstance, or the specific *Instance type.

*Static types removed

The API name itself is now exported as both the value and its type:

// Before
import {Linking, LinkingStatic} from 'react-native';
function foo(linking: LinkingStatic) {}

// After
import {Linking} from 'react-native';
function foo(linking: Linking) {}

Where no same-name type existed previously (InteractionManagerStatic, PixelRatioStatic, DevMenuStatic, KeyboardStatic, DevSettingsStatic, NativeModulesStatic), use typeof the value instead (e.g. typeof PixelRatio).

Full list: AlertStatic, ActionSheetIOSStatic, ToastAndroidStatic, InteractionManagerStatic, UIManagerStatic, PlatformStatic, SectionListStatic, PixelRatioStatic, AppStateStatic, AccessibilityInfoStatic, ImageResizeModeStatic, BackHandlerStatic, DevMenuStatic, ClipboardStatic, PermissionsAndroidStatic, ShareStatic, DeviceEventEmitterStatic, LayoutAnimationStatic, KeyboardStatic, DevSettingsStatic, I18nManagerStatic, EasingStatic, PanResponderStatic, NativeModulesStatic, LogBoxStatic, PushNotificationIOSStatic, SettingsStatic, VibrationStatic

Animated type changes

Animated nodes are no longer generic — they are non-generic types with a generic interpolate method. Remove type parameters from Animated.Value, Animated.ValueXY, etc.

Deprecated *Properties aliases

The legacy *Properties aliases are removed. Rename to the matching *Props type: ViewProperties → ViewProps, TextProperties → TextProps, ImageProperties → ImageProps, etc. — plus ImagePropertiesSourceOptions, which becomes ImageSourcePropType.

StyleSheet.absoluteFillObject

Not part of the Strict API. Replace with StyleSheet.absoluteFill, which is equivalent and works under both API modes:

// Before
style={{...StyleSheet.absoluteFillObject, borderRadius: 12}}

// After
style={{...StyleSheet.absoluteFill, borderRadius: 12}}

useColorScheme() and 'unspecified'

The return type no longer includes 'unspecified' — this value was inaccurately typed in the old manual types and never occurred at runtime. Check for 'dark' and default to 'light':

// Before — handles a case that cannot occur
const theme = scheme === 'unspecified' ? 'light' : scheme;

// After
const theme = scheme === 'dark' ? 'dark' : 'light';

Optional props are type | undefined

Every optional prop is now typed as type | undefined. Wrapper types that re-declare React Native props may need widening to match.

Internal helper types

RecursiveArray, RegisteredStyle, Falsy, WithAnimatedArray, WithAnimatedObject, and other internal-only helpers are no longer accessible from react-native. Inline the type definition or find an alternative.

Leftover component props removed

Props that existed only in the old type definitions were removed — for example lineBreakMode on Text, scrollWithoutAnimationTo on ScrollView, and transform styles declared outside the transform array. Remove or replace these usages.

6. Verify

• Run npx tsc --noEmit again. Confirm zero type errors remain.
• If the project has a Jest suite, run it. Mocks are unaffected by this migration; investigate any new failure before proceeding.

Present a summary of all changes:

• Files modified (count)
• Deep imports rewritten (count)
• Type errors fixed (by category)
• Anything flagged for the user (private APIs with no root equivalent, library incompatibilities)

Bailing out

If the migration cannot be completed — an unresolvable library incompatibility, a larger error count than the user wants to absorb now, or the user asks to defer — the project can temporarily revert to the legacy types:

• React Native >= 0.87: set "customConditions": ["react-native", "react-native-legacy-deep-imports"] in compilerOptions (both entries required, as in step 3). This opt-out is temporary and due for removal in a future release.
• React Native 0.80–0.86: remove "react-native-strict-api" from customConditions, restoring its previous value.

Do not revert completed work that is valid under both API modes — it remains forward progress for a later attempt:

• Deep imports rewritten to root imports
• CodegenTypes namespace usage (also exported when the Strict API is not enabled)
• react-native/setup-env
• Ref types written as React.ComponentRef<typeof Component>

The exception is *Instance ref types, which only exist under the Strict API — when bailing out after step 5, convert these to the equivalent React.ComponentRef<typeof Component> form. If a bail-out seems likely from the start, prefer that form throughout.

When bailing out on 0.87+, encourage the user to share what blocked them in the opt-out discussion thread.