diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..bad00c2
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,5 @@
+{
+  "printWidth": 80,
+  "singleQuote": true,
+  "trailingComma": "es5",
+}
diff --git a/KeychainExample/app.js b/KeychainExample/app.js
index 2f68afe..b24e6c1 100644
--- a/KeychainExample/app.js
+++ b/KeychainExample/app.js
@@ -18,38 +18,43 @@ export default class KeychainExample extends Component {
   };
 
   save() {
-    Keychain
-      .setSecurePassword('myService', this.state.username, this.state.password)
+    Keychain.setSecurePassword(
+      'myService',
+      this.state.username,
+      this.state.password
+    )
       .then(() => {
         this.setState({ status: 'Credentials saved!' });
       })
-      .catch((err) => {
+      .catch(err => {
         this.setState({ status: 'Could not save credentials, ' + err });
       });
   }
 
   load() {
-    Keychain
-      .getSecurePassword('myService')
-      .then((credentials) => {
+    Keychain.getSecurePassword('myService')
+      .then(credentials => {
         if (credentials) {
           this.setState({ ...credentials, status: 'Credentials loaded!' });
         } else {
           this.setState({ status: 'No credentials stored.' });
         }
       })
-      .catch((err) => {
+      .catch(err => {
         this.setState({ status: 'Could not load credentials. ' + err });
       });
   }
 
   reset() {
-    Keychain
-      .resetGenericPassword()
+    Keychain.resetGenericPassword()
       .then(() => {
-        this.setState({ status: 'Credentials Reset!', username: '', password: '' });
+        this.setState({
+          status: 'Credentials Reset!',
+          username: '',
+          password: '',
+        });
       })
-      .catch((err) => {
+      .catch(err => {
         this.setState({ status: 'Could not reset credentials, ' + err });
       });
   }
@@ -58,9 +63,7 @@ export default class KeychainExample extends Component {
     return (
       <KeyboardAvoidingView behavior="padding" style={styles.container}>
         <View style={styles.content}>
-          <Text style={styles.title}>
-            Keychain Example
-          </Text>
+          <Text style={styles.title}>Keychain Example</Text>
           <View style={styles.field}>
             <Text style={styles.label}>Username</Text>
             <TextInput
@@ -68,8 +71,9 @@ export default class KeychainExample extends Component {
               autoFocus={true}
               autoCapitalize="none"
               value={this.state.username}
-              onChange={(event) => this.setState({ username: event.nativeEvent.text })}
-             />
+              onChange={event =>
+                this.setState({ username: event.nativeEvent.text })}
+            />
           </View>
           <View style={styles.field}>
             <Text style={styles.label}>Password</Text>
@@ -78,22 +82,34 @@ export default class KeychainExample extends Component {
               password={true}
               autoCapitalize="none"
               value={this.state.password}
-              onChange={(event) => this.setState({ password: event.nativeEvent.text })}
-             />
+              onChange={event =>
+                this.setState({ password: event.nativeEvent.text })}
+            />
           </View>
-          {!!this.state.status && (<Text style={styles.status}>{this.state.status}</Text>)}
+          {!!this.state.status && (
+            <Text style={styles.status}>{this.state.status}</Text>
+          )}
           <View style={styles.buttons}>
-            <TouchableHighlight onPress={() => this.save()} style={styles.button}>
+            <TouchableHighlight
+              onPress={() => this.save()}
+              style={styles.button}
+            >
               <View style={styles.save}>
                 <Text style={styles.buttonText}>Save</Text>
               </View>
             </TouchableHighlight>
-            <TouchableHighlight onPress={() => this.load()} style={styles.button}>
+            <TouchableHighlight
+              onPress={() => this.load()}
+              style={styles.button}
+            >
               <View style={styles.load}>
                 <Text style={styles.buttonText}>Load</Text>
               </View>
             </TouchableHighlight>
-            <TouchableHighlight onPress={() => this.reset()} style={styles.button}>
+            <TouchableHighlight
+              onPress={() => this.reset()}
+              style={styles.button}
+            >
               <View style={styles.reset}>
                 <Text style={styles.buttonText}>Reset</Text>
               </View>
@@ -110,7 +126,7 @@ const styles = StyleSheet.create({
     flex: 1,
     alignItems: 'center',
     justifyContent: 'center',
-    backgroundColor: '#F5FCFF'
+    backgroundColor: '#F5FCFF',
   },
   content: {
     width: 250,
@@ -165,5 +181,5 @@ const styles = StyleSheet.create({
     fontSize: 14,
     paddingHorizontal: 16,
     paddingVertical: 8,
-  }
+  },
 });
diff --git a/index.js b/index.js
index acb51f6..eea68f2 100644
--- a/index.js
+++ b/index.js
@@ -8,12 +8,12 @@ type SecAccessible =
   | 'AccessibleWhenPasscodeSetThisDeviceOnly'
   | 'AccessibleWhenUnlockedThisDeviceOnly'
   | 'AccessibleAfterFirstUnlockThisDeviceOnly'
-  | 'AccessibleAlwaysThisDeviceOnly'
+  | 'AccessibleAlwaysThisDeviceOnly';
 
 type Options = {
-  accessible?: SecAccessible;
-  accessGroup?: string;
-  service?: string;
+  accessible?: SecAccessible,
+  accessGroup?: string,
+  service?: string,
 };
 
 type SecAccessControl =
@@ -22,16 +22,14 @@ type SecAccessControl =
   | 'TouchIDCurrentSet'
   | 'DevicePasscode'
   | 'TouchIDAnyOrDevicePasscode'
-  | 'TouchIDCurrentSetOrDevicePasscode'
+  | 'TouchIDCurrentSetOrDevicePasscode';
 
-  type LAPolicy =
-    | 'Authentication'
-    | 'AuthenticationWithBiometrics'
+type LAPolicy = 'Authentication' | 'AuthenticationWithBiometrics';
 
 type SecureOptions = {
-  customPrompt?: string;
-  authenticationType?: LAPolicy;
-  accessControl?: SecAccessControl;
+  customPrompt?: string,
+  authenticationType?: LAPolicy,
+  accessControl?: SecAccessControl,
 };
 
 /**
@@ -40,9 +38,7 @@ type SecureOptions = {
  * @param {object} options LAPolicy option, iOS only
  * @return {Promise} Resolves to `true` when successful
  */
-export function canImplyAuthentication(
-  options?: SecureOptions
-): Promise {
+export function canImplyAuthentication(options?: SecureOptions): Promise {
   return RNKeychainManager.canCheckAuthentication(options);
 }
 
@@ -60,7 +56,12 @@ export function setSecurePassword(
   password: string,
   options?: SecureOptions
 ): Promise {
-  return RNKeychainManager.setSecurePasswordForService(service, username, password, options);
+  return RNKeychainManager.setSecurePasswordForService(
+    service,
+    username,
+    password,
+    options
+  );
 }
 
 /**
@@ -89,7 +90,12 @@ export function setInternetCredentials(
   password: string,
   options?: Options
 ): Promise {
-  return RNKeychainManager.setInternetCredentialsForServer(server, username, password, options);
+  return RNKeychainManager.setInternetCredentialsForServer(
+    server,
+    username,
+    password,
+    options
+  );
 }
 
 /**
@@ -120,9 +126,13 @@ export function resetInternetCredentials(
 
 function getOptionsArgument(serviceOrOptions?: string | KeychainOptions) {
   if (Platform.OS !== 'ios') {
-    return typeof serviceOrOptions === 'object' ? serviceOrOptions.service : serviceOrOptions;
+    return typeof serviceOrOptions === 'object'
+      ? serviceOrOptions.service
+      : serviceOrOptions;
   }
-  return typeof serviceOrOptions === 'string' ? { service: serviceOrOptions } : serviceOrOptions;
+  return typeof serviceOrOptions === 'string'
+    ? { service: serviceOrOptions }
+    : serviceOrOptions;
 }
 
 /**
@@ -137,7 +147,11 @@ export function setGenericPassword(
   password: string,
   serviceOrOptions?: string | KeychainOptions
 ): Promise {
-  return RNKeychainManager.setGenericPasswordForOptions(getOptionsArgument(serviceOrOptions), username, password);
+  return RNKeychainManager.setGenericPasswordForOptions(
+    getOptionsArgument(serviceOrOptions),
+    username,
+    password
+  );
 }
 
 /**
@@ -148,7 +162,9 @@ export function setGenericPassword(
 export function getGenericPassword(
   serviceOrOptions?: string | KeychainOptions
 ): Promise {
-  return RNKeychainManager.getGenericPasswordForOptions(getOptionsArgument(serviceOrOptions));
+  return RNKeychainManager.getGenericPasswordForOptions(
+    getOptionsArgument(serviceOrOptions)
+  );
 }
 
 /**
@@ -159,7 +175,9 @@ export function getGenericPassword(
 export function resetGenericPassword(
   serviceOrOptions?: string | KeychainOptions
 ): Promise {
-  return RNKeychainManager.resetGenericPasswordForOptions(getOptionsArgument(serviceOrOptions));
+  return RNKeychainManager.resetGenericPasswordForOptions(
+    getOptionsArgument(serviceOrOptions)
+  );
 }
 
 /**
@@ -167,9 +185,13 @@ export function resetGenericPassword(
  * @return {Promise} Resolves to `{ server, username, password }` if approved and
  * `false` if denied and throws an error if not supported on platform or there's no shared credentials
  */
-export function requestSharedWebCredentials() : Promise {
+export function requestSharedWebCredentials(): Promise {
   if (Platform.OS !== 'ios') {
-    return Promise.reject(new Error(`requestSharedWebCredentials() is not supported on ${Platform.OS} yet`));
+    return Promise.reject(
+      new Error(
+        `requestSharedWebCredentials() is not supported on ${Platform.OS} yet`
+      )
+    );
   }
   return RNKeychainManager.requestSharedWebCredentials();
 }
@@ -185,9 +207,17 @@ export function setSharedWebCredentials(
   server: string,
   username: string,
   password: string
-) : Promise {
+): Promise {
   if (Platform.OS !== 'ios') {
-    return Promise.reject(new Error(`setSharedWebCredentials() is not supported on ${Platform.OS} yet`));
+    return Promise.reject(
+      new Error(
+        `setSharedWebCredentials() is not supported on ${Platform.OS} yet`
+      )
+    );
   }
-  return RNKeychainManager.setSharedWebCredentialsForServer(server, username, password);
+  return RNKeychainManager.setSharedWebCredentialsForServer(
+    server,
+    username,
+    password
+  );
 }