Unify some #if canImport(Darwin) conditional compilations

Sources/Nimble/Matchers/BeGreaterThan.swift

@@ -1,5 +1,3 @@
-import Foundation
-
 /// A Nimble matcher that succeeds when the actual value is greater than the expected value.
 public func beGreaterThan<T: Comparable>(_ expectedValue: T?) -> Predicate<T> {
     let errorMessage = "be greater than <\(stringify(expectedValue))>"
@@ -15,6 +13,8 @@ public func ><T: Comparable>(lhs: Expectation<T>, rhs: T) {
 }
 
 #if canImport(Darwin)
+import enum Foundation.ComparisonResult
+
 /// A Nimble matcher that succeeds when the actual value is greater than the expected value.
 public func beGreaterThan(_ expectedValue: NMBComparable?) -> Predicate<NMBComparable> {
     let errorMessage = "be greater than <\(stringify(expectedValue))>"
@@ -29,9 +29,7 @@ public func beGreaterThan(_ expectedValue: NMBComparable?) -> Predicate<NMBCompa
 public func > (lhs: Expectation<NMBComparable>, rhs: NMBComparable?) {
     lhs.to(beGreaterThan(rhs))
 }
-#endif
 
-#if canImport(Darwin)
 extension NMBPredicate {
     @objc public class func beGreaterThanMatcher(_ expected: NMBComparable?) -> NMBPredicate {
         return NMBPredicate { actualExpression in

Sources/Nimble/Matchers/BeGreaterThanOrEqualTo.swift

@@ -1,5 +1,3 @@
-import Foundation
-
 /// A Nimble matcher that succeeds when the actual value is greater than
 /// or equal to the expected value.
 public func beGreaterThanOrEqualTo<T: Comparable>(_ expectedValue: T?) -> Predicate<T> {
@@ -16,6 +14,8 @@ public func >=<T: Comparable>(lhs: Expectation<T>, rhs: T) {
 }
 
 #if canImport(Darwin)
+import enum Foundation.ComparisonResult
+
 /// A Nimble matcher that succeeds when the actual value is greater than
 /// or equal to the expected value.
 public func beGreaterThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Predicate<T> {
@@ -30,9 +30,7 @@ public func beGreaterThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Pre
 public func >=<T: NMBComparable>(lhs: Expectation<T>, rhs: T) {
     lhs.to(beGreaterThanOrEqualTo(rhs))
 }
-#endif
 
-#if canImport(Darwin)
 extension NMBPredicate {
     @objc public class func beGreaterThanOrEqualToMatcher(_ expected: NMBComparable?) -> NMBPredicate {
         return NMBPredicate { actualExpression in

Sources/Nimble/Matchers/BeLessThan.swift

@@ -1,7 +1,3 @@
-#if canImport(Foundation)
-import enum Foundation.ComparisonResult
-#endif
-
 /// A Nimble matcher that succeeds when the actual value is less than the expected value.
 public func beLessThan<T: Comparable>(_ expectedValue: T?) -> Predicate<T> {
     let message = "be less than <\(stringify(expectedValue))>"
@@ -17,6 +13,8 @@ public func <<T: Comparable>(lhs: Expectation<T>, rhs: T) {
 }
 
 #if canImport(Darwin)
+import enum Foundation.ComparisonResult
+
 /// A Nimble matcher that succeeds when the actual value is less than the expected value.
 public func beLessThan(_ expectedValue: NMBComparable?) -> Predicate<NMBComparable> {
     let message = "be less than <\(stringify(expectedValue))>"
@@ -30,9 +28,7 @@ public func beLessThan(_ expectedValue: NMBComparable?) -> Predicate<NMBComparab
 public func < (lhs: Expectation<NMBComparable>, rhs: NMBComparable?) {
     lhs.to(beLessThan(rhs))
 }
-#endif
 
-#if canImport(Darwin)
 extension NMBPredicate {
     @objc public class func beLessThanMatcher(_ expected: NMBComparable?) -> NMBPredicate {
         return NMBPredicate { actualExpression in

Sources/Nimble/Matchers/BeLessThanOrEqual.swift

@@ -1,7 +1,3 @@
-#if canImport(Foundation)
-import enum Foundation.ComparisonResult
-#endif
-
 /// A Nimble matcher that succeeds when the actual value is less than
 /// or equal to the expected value.
 public func beLessThanOrEqualTo<T: Comparable>(_ expectedValue: T?) -> Predicate<T> {
@@ -17,6 +13,8 @@ public func <=<T: Comparable>(lhs: Expectation<T>, rhs: T) {
 }
 
 #if canImport(Darwin)
+import enum Foundation.ComparisonResult
+
 /// A Nimble matcher that succeeds when the actual value is less than
 /// or equal to the expected value.
 public func beLessThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Predicate<T> {
@@ -30,9 +28,7 @@ public func beLessThanOrEqualTo<T: NMBComparable>(_ expectedValue: T?) -> Predic
 public func <=<T: NMBComparable>(lhs: Expectation<T>, rhs: T) {
     lhs.to(beLessThanOrEqualTo(rhs))
 }
-#endif
 
-#if canImport(Darwin)
 extension NMBPredicate {
     @objc public class func beLessThanOrEqualToMatcher(_ expected: NMBComparable?) -> NMBPredicate {
         return NMBPredicate { actualExpression in

Sources/Nimble/Matchers/MatcherProtocols.swift

@@ -129,17 +129,15 @@ extension NSDate: TestOutputStringConvertible {
     }
 }
 
+#if canImport(Darwin)
 /// Protocol for types to support beLessThan(), beLessThanOrEqualTo(),
 ///  beGreaterThan(), beGreaterThanOrEqualTo(), and equal() matchers.
 ///
 /// Types that conform to Swift's Comparable protocol will work implicitly too
-#if canImport(Darwin)
 @objc public protocol NMBComparable {
     func NMB_compare(_ otherObject: NMBComparable!) -> ComparisonResult
 }
-#endif
 
-#if canImport(Darwin)
 extension NSNumber: NMBComparable {
     public func NMB_compare(_ otherObject: NMBComparable!) -> ComparisonResult {
         // swiftlint:disable:next force_cast