BridgeJS: Migrate Dictionary tests to use conventional style

Plugins/BridgeJS/Sources/BridgeJSCore/ExportSwift.swift

@@ -724,57 +724,19 @@ struct StackCodegen {
         switch type {
         case .string, .int, .uint, .bool, .float, .double,
             .jsObject(nil), .jsValue, .swiftStruct, .swiftHeapObject, .unsafePointer,
-            .swiftProtocol, .caseEnum, .associatedValueEnum, .rawValueEnum, .array:
+            .swiftProtocol, .caseEnum, .associatedValueEnum, .rawValueEnum, .array, .dictionary:
             return "\(raw: type.swiftType).bridgeJSStackPop()"
         case .jsObject(let className?):
             return "\(raw: className)(unsafelyWrapping: JSObject.bridgeJSStackPop())"
         case .nullable(let wrappedType, let kind):
             return liftNullableExpression(wrappedType: wrappedType, kind: kind)
-        case .dictionary(let valueType):
-            return liftDictionaryExpression(valueType: valueType)
         case .closure:
             return "JSObject.bridgeJSStackPop()"
         case .void, .namespaceEnum:
             return "()"
         }
     }
 
-    func liftDictionaryExpression(valueType: BridgeType) -> ExprSyntax {
-        switch valueType {
-        case .jsObject(let className?) where className != "JSObject":
-            return """
-                {
-                    let __dict = [String: JSObject].bridgeJSStackPop()
-                    return __dict.mapValues { \(raw: className)(unsafelyWrapping: $0) }
-                }()
-                """
-        case .nullable, .closure:
-            return liftDictionaryExpressionInline(valueType: valueType)
-        case .void, .namespaceEnum:
-            fatalError("Invalid dictionary value type: \(valueType)")
-        default:
-            return "[String: \(raw: valueType.swiftType)].bridgeJSStackPop()"
-        }
-    }
-
-    private func liftDictionaryExpressionInline(valueType: BridgeType) -> ExprSyntax {
-        let valueLift = liftExpression(for: valueType)
-        let swiftTypeName = valueType.swiftType
-        return """
-            {
-                let __count = Int(_swift_js_pop_i32())
-                var __result: [String: \(raw: swiftTypeName)] = [:]
-                __result.reserveCapacity(__count)
-                for _ in 0..<__count {
-                    let __value = \(valueLift)
-                    let __key = String.bridgeJSStackPop()
-                    __result[__key] = __value
-                }
-                return __result
-            }()
-            """
-    }
-
     private func liftNullableExpression(wrappedType: BridgeType, kind: JSOptionalKind) -> ExprSyntax {
         let typeName = kind == .null ? "Optional" : "JSUndefinedOr"
         switch wrappedType {

Tests/BridgeJSRuntimeTests/DictionarySupportTests.swift

@@ -0,0 +1,54 @@
+@_spi(BridgeJS) import JavaScriptKit
+import XCTest
+
+@JSClass struct DictionarySupportImports {
+    @JSFunction static func jsRoundTripDictionaryInt(_ values: [String: Int]) throws(JSException) -> [String: Int]
+    @JSFunction static func jsRoundTripDictionaryBool(_ values: [String: Bool]) throws(JSException) -> [String: Bool]
+    @JSFunction static func jsRoundTripDictionaryDouble(
+        _ values: [String: Double]
+    ) throws(JSException) -> [String: Double]
+    @JSFunction static func jsRoundTripDictionaryJSObject(
+        _ values: [String: JSObject]
+    ) throws(JSException) -> [String: JSObject]
+    @JSFunction static func jsRoundTripDictionaryJSValue(
+        _ values: [String: JSValue]
+    ) throws(JSException) -> [String: JSValue]
+    @JSFunction static func jsRoundTripDictionaryDoubleArray(
+        _ values: [String: [Double]]
+    ) throws(JSException) -> [String: [Double]]
+}
+
+final class DictionarySupportTests: XCTestCase {
+
+    private func roundTripTest<T: Equatable>(_ fn: ([String: T]) throws -> [String: T], _ input: [String: T]) throws {
+        let result = try fn(input)
+        XCTAssertEqual(result, input)
+    }
+
+    func testRoundTripDictionaryInt() throws {
+        try roundTripTest(DictionarySupportImports.jsRoundTripDictionaryInt, ["a": 1, "b": 2])
+    }
+
+    func testRoundTripDictionaryBool() throws {
+        try roundTripTest(DictionarySupportImports.jsRoundTripDictionaryBool, ["yes": true, "no": false])
+    }
+
+    func testRoundTripDictionaryDouble() throws {
+        try roundTripTest(DictionarySupportImports.jsRoundTripDictionaryDouble, ["pi": 3.14, "tau": 6.28])
+    }
+
+    func testRoundTripDictionaryJSObject() throws {
+        try roundTripTest(DictionarySupportImports.jsRoundTripDictionaryJSObject, ["global": JSObject.global])
+    }
+
+    func testRoundTripDictionaryJSValue() throws {
+        try roundTripTest(
+            DictionarySupportImports.jsRoundTripDictionaryJSValue,
+            ["number": .number(123.5), "boolean": .boolean(true), "string": .string("hello"), "null": .null]
+        )
+    }
+
+    func testRoundTripDictionaryDoubleArray() throws {
+        try roundTripTest(DictionarySupportImports.jsRoundTripDictionaryDoubleArray, ["xs": [1.0, 2.5], "ys": []])
+    }
+}