@class NSDictionary, NSArray; @interface EMMessageHeaders : NSObject <NSSecureCoding> @property (class, readonly) BOOL supportsSecureCoding; @property (copy, nonatomic) NSDictionary *headers; @property (readonly, copy, nonatomic) NSArray *headerKeys; - (void)encodeWithCoder:(id)a0; - (void).cxx_destruct; - (id)initWithCoder:(id)a0; - (id)firstHeaderForKey:(id)a0; - (id)headersForKey:(id)a0; - (id)initWithHeaders:(id)a0; @end