refactor(tests): migrate test suite and mock-builders to TypeScript

Migrates 44 mock-builders, 36 test files, 2 offline-support helpers, 1
test utility (BetterSqlite), and jest-setup from JS to TS. Adds
tsconfig.test.json so tests and mock-builders are type-checked (base
tsconfig still excludes them from the published build) and a
test:typecheck script.

Dependency changes:
- @types/jest: ^29.5.14 -> ^30.0.0
- jest: ^30.0.0 -> ^30.3.0
- @total-typescript/shoehorn: new devDependency (fromPartial<T>() for
  type-safe partial mocks, replacing `as any` / `Record<string, any>`)

Caveats:
- tsconfig.test.json keeps noImplicitAny: false as a starting point;
  tightening is follow-up work (Phase 5 of the migration plan).
- yarn test:typecheck exists but is not wired into CI yet.

Verification:
- yarn build passes
- yarn lint passes
- yarn test:unit shows only the pre-existing SQLite-isolation flake in
  offline-support/index.test.ts (baseline had 5 failures; now 2 — no
  regressions).

Author: oliverlaz

package/jest-setup.js package/jest-setup.tsxpackage/jest-setup.js renamed to package/jest-setup.tsx

@@ -1,5 +1,6 @@
 /* global require */
-import rn, { FlatList, View } from 'react-native';
+import type { ReactNode } from 'react';
+import { FlatList, View } from 'react-native';
 
 import mockRNCNetInfo from '@react-native-community/netinfo/jest/netinfo-mock.js';
 import mockSafeAreaContext from 'react-native-safe-area-context/jest/mock';
@@ -36,12 +37,18 @@ registerNativeHandlers({
 
 jest.mock('react-native-reanimated', () => {
   const RNReanimatedmock = require('react-native-reanimated/mock');
-  return { ...RNReanimatedmock, runOnUI: (fn) => fn };
+  return { ...RNReanimatedmock, runOnUI: (fn: () => unknown) => fn };
 });
 
 jest.mock('@react-native-community/netinfo', () => mockRNCNetInfo);
 
-const BottomSheetMock = ({ handleComponent, children }) => (
+const BottomSheetMock = ({
+  handleComponent,
+  children,
+}: {
+  handleComponent: () => ReactNode;
+  children: ReactNode;
+}) => (
   <View>
     {handleComponent()}
     {children}

package/jest.config.js

@@ -9,7 +9,7 @@ module.exports = {
   setupFiles: ['./node_modules/react-native-gesture-handler/jestSetup.js'],
   setupFilesAfterEnv: [
     '@testing-library/jest-native/extend-expect',
-    require.resolve('./jest-setup.js'),
+    require.resolve('./jest-setup.tsx'),
   ],
   testEnvironment: 'node',
   testPathIgnorePatterns: ['/node_modules/', '/examples/', '__snapshots__', '/lib/'],

package/package.json

@@ -37,6 +37,7 @@
     "prettier": "prettier --list-different '**/*.{js,ts,tsx,md,json}' eslint.config.mjs ../.prettierrc babel.config.js",
     "prettier-fix": "prettier --write '**/*.{js,ts,tsx,md,json}' eslint.config.mjs ../.prettierrc babel.config.js",
     "test:coverage": "yarn test:unit --coverage",
+    "test:typecheck": "tsc --noEmit -p tsconfig.test.json",
     "test:unit": "TZ=UTC jest",
     "validate-translations": "node bin/validate-translations.js",
     "get-version": "echo $npm_package_version",
@@ -127,9 +128,10 @@
     "@shopify/flash-list": "^2.1.0",
     "@testing-library/jest-native": "^5.4.3",
     "@testing-library/react-native": "13.2.0",
+    "@total-typescript/shoehorn": "^0.1.2",
     "@types/better-sqlite3": "^7.6.13",
     "@types/eslint": "9.6.1",
-    "@types/jest": "^29.5.14",
+    "@types/jest": "^30.0.0",
     "@types/linkify-it": "5.0.0",
     "@types/lodash": "4.17.16",
     "@types/mime-types": "2.1.4",
@@ -154,7 +156,7 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-native": "^5.0.0",
     "i18next-cli": "^1.31.0",
-    "jest": "^30.0.0",
+    "jest": "^30.3.0",
     "moment-timezone": "^0.6.0",
     "prettier": "^3.5.3",
     "react": "19.1.0",