Gracefully handle unavailable APIs (#41)

Updating the API to make it compatible with swiftwasm/JavaScriptKit#190.

* Gracefully handle unavailable APIs

* Update `Package.resolved`

* Use JSKit 0.15.0

Author: MaxDesiatov

Package.resolved

@@ -6,8 +6,8 @@
         "repositoryURL": "https://github.com/swiftwasm/JavaScriptKit.git",
         "state": {
           "branch": null,
-          "revision": "95d0c4cd78b48ffc7e19c618d57c3244917be09a",
-          "version": null
+          "revision": "2d7bc960eed438dce7355710ece43fa004bbb3ac",
+          "version": "0.15.0"
         }
       }
     ]

Package.swift

@@ -20,7 +20,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/swiftwasm/JavaScriptKit.git",
-            .revision("95d0c4cd78b48ffc7e19c618d57c3244917be09a")
+            from: "0.15.0"
         ),
     ],
     targets: [
@@ -30,7 +30,12 @@ let package = Package(
         ),
         .target(
             name: "WebAPIKit",
-            dependencies: ["ECMAScript", "JavaScriptKit", .product(name: "JavaScriptEventLoop", package: "JavaScriptKit")]
+            dependencies: [
+                "ECMAScript",
+                "JavaScriptKit",
+                .product(name: "JavaScriptEventLoop", package: "JavaScriptKit"),
+                .product(name: "JavaScriptBigIntSupport", package: "JavaScriptKit"),
+            ]
         ),
         // This support library should be moved to JavaScriptKit
         .target(name: "ECMAScript", dependencies: [

Sources/ECMAScript/ArrayBuffer.swift

@@ -15,7 +15,7 @@ public typealias Float32Array = JSTypedArray<Float32>
 public typealias Float64Array = JSTypedArray<Float64>
 
 public class ArrayBuffer: JSBridgedClass {
-    public class var constructor: JSFunction { JSObject.global.ArrayBuffer.function! }
+    public class var constructor: JSFunction? { JSObject.global.ArrayBuffer.function }
 
     public let jsObject: JSObject
 
@@ -24,32 +24,34 @@ public class ArrayBuffer: JSBridgedClass {
     }
 
     public convenience init(length: Int) {
-        self.init(unsafelyWrapping: Self.constructor.new(length))
+        self.init(unsafelyWrapping: Self.constructor!.new(length))
     }
 
+    @inlinable
     public static func isView(_ object: JSValueCompatible) -> Bool {
         JSObject.global.ArrayBuffer.object!.isView!(object).fromJSValue()!
     }
 }
 
 public extension JSTypedArray {
     convenience init(_ arrayBuffer: ArrayBuffer) {
-        self.init(unsafelyWrapping: Self.constructor.new(arrayBuffer))
+        self.init(unsafelyWrapping: Self.constructor!.new(arrayBuffer))
     }
 
+    @inlinable
     var buffer: ArrayBuffer {
         ArrayBuffer(unsafelyWrapping: jsObject.buffer.object!)
     }
 }
 
 #if canImport(Foundation)
-import Foundation
+    import Foundation
 
-public extension Data {
-    init(_ arrayBuffer: ArrayBuffer) {
-        self = JSTypedArray<UInt8>(arrayBuffer).withUnsafeBytes {
-            Data(buffer: $0)
+    public extension Data {
+        init(_ arrayBuffer: ArrayBuffer) {
+            self = JSTypedArray<UInt8>(arrayBuffer).withUnsafeBytes {
+                Data(buffer: $0)
+            }
         }
     }
-}
 #endif

Sources/ECMAScript/DataView.swift

@@ -5,7 +5,7 @@
 import JavaScriptKit
 
 public class DataView: JSBridgedClass {
-    public class var constructor: JSFunction { JSObject.global.DataView.function! }
+    public class var constructor: JSFunction? { JSObject.global.DataView.function }
 
     public let jsObject: JSObject
 
@@ -17,15 +17,15 @@ public class DataView: JSBridgedClass {
     }
 
     public convenience init(buffer: ArrayBuffer) {
-        self.init(unsafelyWrapping: DataView.constructor.new(buffer.jsValue))
+        self.init(unsafelyWrapping: DataView.constructor!.new(buffer.jsValue))
     }
 
     public convenience init(buffer: ArrayBuffer, byteOffset: UInt32) {
-        self.init(unsafelyWrapping: DataView.constructor.new(buffer.jsValue, byteOffset.jsValue))
+        self.init(unsafelyWrapping: DataView.constructor!.new(buffer.jsValue, byteOffset.jsValue))
     }
 
     public convenience init(buffer: ArrayBuffer, byteOffset: UInt32, byteLength: UInt32) {
-        self.init(unsafelyWrapping: DataView.constructor.new(buffer.jsValue, byteOffset.jsValue, byteLength.jsValue))
+        self.init(unsafelyWrapping: DataView.constructor!.new(buffer.jsValue, byteOffset.jsValue, byteLength.jsValue))
     }
 
     @ReadonlyAttribute