DefinitelyTyped · jakebailey · Jul 19, 2024 · Jul 19, 2024
diff --git a/types/dom-view-transitions/dom-view-transitions-tests.ts b/types/dom-view-transitions/dom-view-transitions-tests.ts
@@ -1,11 +1,11 @@
 const updateCallback: () => Promise<void> | void = () => {};
 // $ExpectType ViewTransition
 const viewTransition = document.startViewTransition(updateCallback);
-// $ExpectType Promise<void>
+// $ExpectType Promise<undefined>
 const finished = viewTransition.finished;
-// $ExpectType Promise<void>
+// $ExpectType Promise<undefined>
 const ready = viewTransition.ready;
-// $ExpectType Promise<void>
+// $ExpectType Promise<undefined>
 const updateCallbackdone: Promise<void> = viewTransition.updateCallbackDone;
 // $ExpectType void
 viewTransition.skipTransition();
diff --git a/types/dom-view-transitions/index.d.ts b/types/dom-view-transitions/index.d.ts
@@ -3,9 +3,9 @@ interface Document {
 }
 
 interface ViewTransition {
-    finished: Promise<void>;
-    ready: Promise<void>;
-    updateCallbackDone: Promise<void>;
+    readonly ready: Promise<undefined>;
+    readonly finished: Promise<undefined>;
+    readonly updateCallbackDone: Promise<undefined>;
     skipTransition(): void;
 }
 

diff --git a/types/dom-view-transitions/package.json b/types/dom-view-transitions/package.json
@@ -7,6 +7,14 @@
     "projects": [
         "https://drafts.csswg.org/css-view-transitions-1/"
     ],
+    "types": "index",
+    "typesVersions": {
+        "<=5.5": {
+            "*": [
+                "ts5.5/*"
+            ]
+        }
+    },
     "devDependencies": {
         "@types/dom-view-transitions": "workspace:."
     },

diff --git a/types/dom-view-transitions/ts5.5/dom-view-transitions-tests.ts b/types/dom-view-transitions/ts5.5/dom-view-transitions-tests.ts
@@ -0,0 +1,11 @@
+const updateCallback: () => Promise<void> | void = () => {};
+// $ExpectType ViewTransition
+const viewTransition = document.startViewTransition(updateCallback);
+// $ExpectType Promise<void>
+const finished = viewTransition.finished;
+// $ExpectType Promise<void>
+const ready = viewTransition.ready;
+// $ExpectType Promise<void>
+const updateCallbackdone: Promise<void> = viewTransition.updateCallbackDone;
+// $ExpectType void
+viewTransition.skipTransition();
diff --git a/types/dom-view-transitions/ts5.5/index.d.ts b/types/dom-view-transitions/ts5.5/index.d.ts
@@ -0,0 +1,14 @@
+interface Document {
+    startViewTransition(updateCallback: () => Promise<void> | void): ViewTransition;
+}
+
+interface ViewTransition {
+    finished: Promise<void>;
+    ready: Promise<void>;
+    updateCallbackDone: Promise<void>;
+    skipTransition(): void;
+}
+
+interface CSSStyleDeclaration {
+    viewTransitionName: string;
+}
diff --git a/types/dom-view-transitions/ts5.5/tsconfig.json b/types/dom-view-transitions/ts5.5/tsconfig.json
@@ -0,0 +1,20 @@
+{
+    "compilerOptions": {
+        "module": "node16",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "dom-view-transitions-tests.ts"
+    ]
+}