fix: Extract to Types

src/LazyTurboModule.ts

@@ -0,0 +1,53 @@
+import { NativeModules, Platform, TurboModule } from 'react-native';
+
+/**
+ * Lazily get a TurboModule by wrapping it in a Proxy.
+ */
+export function getLazyTurboModule<T extends TurboModule>(
+  initializeTurboModule: () => T | undefined
+): T {
+  const proxy = new Proxy<T>(undefined, {
+    get: (target, property) => {
+      if (target == null) {
+        // Target is null, let's initialize it!
+        target = initializeTurboModule();
+
+        if (target == null) {
+          // if it still is null, something went wrong!
+          let message =
+            'Failed to create a new MMKV instance: The native MMKV Module could not be found.';
+          message +=
+            '\n* Make sure react-native-mmkv is correctly autolinked (run `npx react-native config` to verify)';
+          if (Platform.OS === 'ios' || Platform.OS === 'macos') {
+            message +=
+              '\n* Make sure you ran `pod install` in the ios/ directory.';
+          }
+          if (Platform.OS === 'android') {
+            message += '\n* Make sure gradle is synced.';
+          }
+          // check if Expo
+          const ExpoConstants =
+            NativeModules.NativeUnimoduleProxy?.modulesConstants
+              ?.ExponentConstants;
+          if (ExpoConstants != null) {
+            if (ExpoConstants.appOwnership === 'expo') {
+              // We're running Expo Go
+              throw new Error(
+                'react-native-mmkv is not supported in Expo Go! Use EAS (`expo prebuild`) or eject to a bare workflow instead.'
+              );
+            } else {
+              // We're running Expo bare / standalone
+              message += '\n* Make sure you ran `expo prebuild`.';
+            }
+          }
+
+          message += '\n* Make sure you rebuilt the app.';
+          throw new Error(message);
+        }
+      }
+
+      return target[property];
+    },
+  });
+  return proxy;
+}

src/MMKV.ts

@@ -3,98 +3,9 @@ import { createMMKV } from './createMMKV';
 import { createMockMMKV } from './createMMKV.mock';
 import { isJest } from './PlatformChecker';
 import { Configuration } from './NativeMmkv';
+import { Listener, MMKVInterface, NativeMMKV } from './Types';
 export { Configuration, Mode } from './NativeMmkv';
 
-interface Listener {
-  remove: () => void;
-}
-
-/**
- * Represents a single MMKV instance.
- */
-export interface NativeMMKV {
-  /**
-   * Set a value for the given `key`.
-   */
-  set: (key: string, value: boolean | string | number | ArrayBuffer) => void;
-  /**
-   * Get the boolean value for the given `key`, or `undefined` if it does not exist.
-   *
-   * @default undefined
-   */
-  getBoolean: (key: string) => boolean | undefined;
-  /**
-   * Get the string value for the given `key`, or `undefined` if it does not exist.
-   *
-   * @default undefined
-   */
-  getString: (key: string) => string | undefined;
-  /**
-   * Get the number value for the given `key`, or `undefined` if it does not exist.
-   *
-   * @default undefined
-   */
-  getNumber: (key: string) => number | undefined;
-  /**
-   * Get a raw buffer of unsigned 8-bit (0-255) data.
-   *
-   * @default undefined
-   */
-  getBuffer: (key: string) => ArrayBuffer | undefined;
-  /**
-   * Checks whether the given `key` is being stored in this MMKV instance.
-   */
-  contains: (key: string) => boolean;
-  /**
-   * Delete the given `key`.
-   */
-  delete: (key: string) => void;
-  /**
-   * Get all keys.
-   *
-   * @default []
-   */
-  getAllKeys: () => string[];
-  /**
-   * Delete all keys.
-   */
-  clearAll: () => void;
-  /**
-   * Sets (or updates) the encryption-key to encrypt all data in this MMKV instance with.
-   *
-   * To remove encryption, pass `undefined` as a key.
-   *
-   * Encryption keys can have a maximum length of 16 bytes.
-   */
-  recrypt: (key: string | undefined) => void;
-  /**
-   * Trims the storage space and clears memory cache.
-   *
-   * Since MMKV does not resize itself after deleting keys, you can call `trim()`
-   * after deleting a bunch of keys to manually trim the memory- and
-   * disk-file to reduce storage and memory usage.
-   *
-   * In most applications, this is not needed at all.
-   */
-  trim(): void;
-  /**
-   * Get the current total size of the storage, in bytes.
-   */
-  readonly size: number;
-}
-
-interface MMKVInterface extends NativeMMKV {
-  /**
-   * Adds a value changed listener. The Listener will be called whenever any value
-   * in this storage instance changes (set or delete).
-   *
-   * To unsubscribe from value changes, call `remove()` on the Listener.
-   */
-  addOnValueChangedListener: (
-    onValueChanged: (key: string) => void
-  ) => Listener;
-}
-
 const onValueChangedListeners = new Map<string, ((key: string) => void)[]>();
 
 /**

src/Types.ts

@@ -0,0 +1,89 @@
+/**
+ * Represents a single MMKV instance.
+ */
+export interface NativeMMKV {
+  /**
+   * Set a value for the given `key`.
+   */
+  set: (key: string, value: boolean | string | number | ArrayBuffer) => void;
+  /**
+   * Get the boolean value for the given `key`, or `undefined` if it does not exist.
+   *
+   * @default undefined
+   */
+  getBoolean: (key: string) => boolean | undefined;
+  /**
+   * Get the string value for the given `key`, or `undefined` if it does not exist.
+   *
+   * @default undefined
+   */
+  getString: (key: string) => string | undefined;
+  /**
+   * Get the number value for the given `key`, or `undefined` if it does not exist.
+   *
+   * @default undefined
+   */
+  getNumber: (key: string) => number | undefined;
+  /**
+   * Get a raw buffer of unsigned 8-bit (0-255) data.
+   *
+   * @default undefined
+   */
+  getBuffer: (key: string) => ArrayBuffer | undefined;
+  /**
+   * Checks whether the given `key` is being stored in this MMKV instance.
+   */
+  contains: (key: string) => boolean;
+  /**
+   * Delete the given `key`.
+   */
+  delete: (key: string) => void;
+  /**
+   * Get all keys.
+   *
+   * @default []
+   */
+  getAllKeys: () => string[];
+  /**
+   * Delete all keys.
+   */
+  clearAll: () => void;
+  /**
+   * Sets (or updates) the encryption-key to encrypt all data in this MMKV instance with.
+   *
+   * To remove encryption, pass `undefined` as a key.
+   *
+   * Encryption keys can have a maximum length of 16 bytes.
+   */
+  recrypt: (key: string | undefined) => void;
+  /**
+   * Trims the storage space and clears memory cache.
+   *
+   * Since MMKV does not resize itself after deleting keys, you can call `trim()`
+   * after deleting a bunch of keys to manually trim the memory- and
+   * disk-file to reduce storage and memory usage.
+   *
+   * In most applications, this is not needed at all.
+   */
+  trim(): void;
+  /**
+   * Get the current total size of the storage, in bytes.
+   */
+  readonly size: number;
+}
+
+export interface Listener {
+  remove: () => void;
+}
+
+export interface MMKVInterface extends NativeMMKV {
+  /**
+   * Adds a value changed listener. The Listener will be called whenever any value
+   * in this storage instance changes (set or delete).
+   *
+   * To unsubscribe from value changes, call `remove()` on the Listener.
+   */
+  addOnValueChangedListener: (
+    onValueChanged: (key: string) => void
+  ) => Listener;
+}

src/createMMKV.mock.ts

@@ -1,4 +1,4 @@
-import type { NativeMMKV } from './MMKV';
+import type { NativeMMKV } from './Types';
 
 /* Mock MMKV instance for use in tests */
 export const createMockMMKV = (): NativeMMKV => {

src/createMMKV.ts

@@ -1,4 +1,5 @@
-import type { Configuration, NativeMMKV } from './MMKV';
+import type { Configuration } from './MMKV';
+import type { NativeMMKV } from './Types';
 import { getMMKVTurboModule } from './NativeMmkv';
 
 const module = getMMKVTurboModule();

src/createMMKV.web.ts

@@ -1,5 +1,6 @@
 /* global localStorage */
-import type { Configuration, NativeMMKV } from './MMKV';
+import type { Configuration } from './MMKV';
+import type { NativeMMKV } from './Types';
 import { createTextEncoder } from './createTextEncoder';
 
 const canUseDOM =