WebIDLToSwift: Generate single file to make output filenames predictable (#19)

* WebIDLToSwift: Generate into a single file to make the output filenames predictable

* Split DOM related support code and generic support snippet

* Stop cleaning up generated directory

* Format only Generated.swift

* Move Sources/DOMKit/WebIDL/*.swift to Sources/DOMKit/

* Move hardcoded output path to main.swift

Author: kateinoigakukun

Package.swift

@@ -26,7 +26,11 @@ let package = Package(
             dependencies: ["DOMKit"]),
         .target(
             name: "DOMKit",
-            dependencies: ["JavaScriptKit", .product(name: "JavaScriptEventLoop", package: "JavaScriptKit")]),
+            dependencies: ["ECMAScript", "JavaScriptKit", .product(name: "JavaScriptEventLoop", package: "JavaScriptKit")]),
+        // This support library should be moved to JavaScriptKit
+        .target(name: "ECMAScript", dependencies: [
+            "JavaScriptKit",
+            .product(name: "JavaScriptEventLoop", package: "JavaScriptKit")]),
         .target(name: "WebIDL"),
         .target(
             name: "WebIDLToSwift",

Sources/DOMKit/ECMAScript/CanvasImageSource.swift renamed to Sources/DOMKit/CanvasImageSource.swift

@@ -1,4 +1,5 @@
 import JavaScriptKit
+@_exported import ECMAScript
 
 /* TODO: fix this */
 public typealias __UNSUPPORTED_BIGINT__ = JSValue