A few type/nullability annotations (#1782)

src/objc/imap/MCOIMAPFetchMessagesOperation.h

@@ -15,6 +15,7 @@
 
 /** This class implements an operation to fetch a list of messages from a folder */
 
+@class MCOIMAPMessage;
 @class MCOIndexSet;
 
 NS_ASSUME_NONNULL_BEGIN
@@ -39,7 +40,7 @@ NS_ASSUME_NONNULL_BEGIN
 
    If you are not supporting QRESYNC you can safely ignore `vanishedMessages`.
 */
-- (void) start:(void (^)(NSError * __nullable error, NSArray * /* MCOIMAPMessage */ __nullable messages, MCOIndexSet * __nullable vanishedMessages))completionBlock;
+- (void) start:(void (^)(NSError * __nullable error, NSArray<MCOIMAPMessage *> * __nullable messages, MCOIndexSet * __nullable vanishedMessages))completionBlock;
 
 @end
 NS_ASSUME_NONNULL_END

src/objc/imap/MCOIMAPFetchMessagesOperation.mm

@@ -41,7 +41,7 @@ - (void) dealloc
     [super dealloc];
 }
 
-- (void) start:(void (^)(NSError *error, NSArray * messages, MCOIndexSet * vanishedMessages))completionBlock
+- (void) start:(void (^)(NSError *error, NSArray<MCOIMAPMessage *> * messages, MCOIndexSet * vanishedMessages))completionBlock
 {
     _completionBlock = [completionBlock copy];
     [self start];

src/objc/provider/MCOMailProvider.h

@@ -8,6 +8,8 @@
 
 #import <Foundation/Foundation.h>
 
+@class MCONetService;
+
 /**
    Represents a email service provider, like for example Gmail, Yahoo, Fastmail.fm etc.
 */
@@ -22,19 +24,19 @@
    A list of ways that you can connect to the IMAP server
    @return An array of MCONetService
 */
-- (NSArray * /* MCONetService */) imapServices;
+- (NSArray<MCONetService *> *) imapServices;
 
 /**
    A list of ways that you can connect to the SMTP server
    @return An array of MCONetService
 */
-- (NSArray * /* MCONetService */) smtpServices;
+- (NSArray<MCONetService *> *) smtpServices;
 
 /**
    A list of ways that you can connect to the POP3 server
    @return An array of MCONetService
 */
-- (NSArray * /* MCONetService */) popServices;
+- (NSArray<MCONetService *> *) popServices;
 
 - (BOOL) matchEmail:(NSString *)email;
 - (BOOL) matchMX:(NSString *)hostname;

src/objc/provider/MCOMailProvidersManager.h

@@ -20,32 +20,36 @@
 
 @interface MCOMailProvidersManager : NSObject
 
+NS_ASSUME_NONNULL_BEGIN
+
 /** The shared manager that is used for all lookups */
 + (MCOMailProvidersManager *) sharedManager;
 
 /** 
     Given an email address will try to determine the provider
     @return The email provider info or nil if it can't be determined.
 */
-- (MCOMailProvider *) providerForEmail:(NSString *)email;
+- (nullable MCOMailProvider *) providerForEmail:(NSString *)email;
 
 /** 
     Given the DNS MX record will try to determine the provider
     @return The email provider info or nil if it can't be determined.
 */
-- (MCOMailProvider *) providerForMX:(NSString *)hostname;
+- (nullable MCOMailProvider *) providerForMX:(NSString *)hostname;
 
 /**
    Will return information about a provider. Useful if you already know the
    provider (like if it has been determined previously)
    @return The email provider info or nil if none matches
 */
-- (MCOMailProvider *) providerForIdentifier:(NSString *)identifier;
+- (nullable MCOMailProvider *) providerForIdentifier:(NSString *)identifier;
 
 /**
    Registers the providers in the JSON file at the file path so they
    can be used with MCOMailProvidersManager.
  */
 - (void) registerProvidersWithFilename:(NSString *)filename;
 
+NS_ASSUME_NONNULL_END
+
 @end