Add JSDictionary type for Embedded Swift compat

Author: MaxDesiatov

Runtime/src/index.ts

@@ -517,6 +517,8 @@ export class SwiftRuntime {
                 return this.memory.retain(array.slice());
             },
 
+            swjs_create_object: () => { return this.memory.retain({}); },
+
             swjs_load_typed_array: (ref: ref, buffer: pointer) => {
                 const memory = this.memory;
                 const typedArray = memory.getObject(ref);

Runtime/src/types.ts

@@ -102,6 +102,7 @@ export interface ImportedFunctions {
         elementsPtr: pointer,
         length: number
     ): number;
+    swjs_create_object(): number;
     swjs_load_typed_array(ref: ref, buffer: pointer): void;
     swjs_release(ref: number): void;
     swjs_release_remote(tid: number, ref: number): void;

Sources/JavaScriptKit/FundamentalObjects/JSDictionary.swift

@@ -0,0 +1,34 @@
+import _CJavaScriptKit
+
+public final class JSDictionary {
+  private let ref: JSObject
+
+  init(ref: JSObject) { self.ref = ref }
+
+  public init() { ref = JSObject(id: swjs_create_object()) }
+
+  public subscript(key: String) -> JSValue {
+    get { ref[dynamicMember: key] }
+    set { ref[dynamicMember: key] = newValue }
+  }
+}
+
+extension JSDictionary: ExpressibleByDictionaryLiteral {
+  public convenience init(dictionaryLiteral elements: (String, JSValue)...) {
+    self.init()
+
+    for (key, value) in elements { self[key] = value }
+  }
+}
+
+extension JSDictionary: ConvertibleToJSValue {
+  public var jsValue: JSValue { .object(ref) }
+}
+
+extension JSDictionary: ConstructibleFromJSValue {
+  public static func construct(from value: JSValue) -> JSDictionary? {
+    guard let object = value.object else { return nil }
+
+    return JSDictionary(ref: object)
+  }
+}

Sources/_CJavaScriptKit/include/_CJavaScriptKit.h

@@ -314,6 +314,8 @@ IMPORT_JS_FUNCTION(swjs_terminate_worker_thread, void, (int tid))
 
 IMPORT_JS_FUNCTION(swjs_get_worker_thread_id, int, (void))
 
+IMPORT_JS_FUNCTION(swjs_create_object, JavaScriptObjectRef, (void))
+
 int swjs_get_worker_thread_id_cached(void);
 
 /// Requests sending a JavaScript object to another worker thread.