🤖 Merge PR #56849 dom-navigation-preload: Add types for service worker navigation preload by @frigus02

* Add types for service worker navigation preload

TypeScript 4.4 removed types for navigation preload. This makes sense
because it's currently only supported by Chromium based browsers. It
seems to make sense to add those types to DefinitelyTyped until more
browser engines support it.

* Add mprobst as owner for dom-navigation-preload

types/dom-navigation-preload/dom-navigation-preload-tests.ts

@@ -0,0 +1,13 @@
+// This throws a TypeError at runtime, but TypeScript should probably allow it.
+new NavigationPreloadManager();
+
+navigator.serviceWorker.ready.then(async registration => {
+    await registration.navigationPreload.enable();
+    await registration.navigationPreload.disable();
+
+    await registration.navigationPreload.setHeaderValue('test');
+
+    const state = await registration.navigationPreload.getState();
+    console.log(state.enabled);
+    console.log(state.headerValue);
+});

types/dom-navigation-preload/index.d.ts

@@ -0,0 +1,30 @@
+// Type definitions for non-npm package dom-navigation-preload-browser 0.0
+// Project: https://w3c.github.io/ServiceWorker/#service-worker-registration-navigationpreload
+// Definitions by: Jan Kuehle <https://github.com/frigus02>
+//                 Martin Probst <https://github.com/mprobst>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// Minimum TypeScript Version: 4.4
+
+interface ServiceWorkerRegistration {
+    /*~ https://w3c.github.io/ServiceWorker/#ref-for-dom-serviceworkerregistration-navigationpreload */
+    readonly navigationPreload: NavigationPreloadManager;
+}
+
+/*~ https://w3c.github.io/ServiceWorker/#navigationpreloadmanager */
+interface NavigationPreloadManager {
+    disable(): Promise<void>;
+    enable(): Promise<void>;
+    getState(): Promise<NavigationPreloadState>;
+    setHeaderValue(value: string): Promise<void>;
+}
+
+declare var NavigationPreloadManager: {
+    prototype: NavigationPreloadManager;
+    new (): NavigationPreloadManager;
+};
+
+/*~ https://w3c.github.io/ServiceWorker/#dictdef-navigationpreloadstate */
+interface NavigationPreloadState {
+    enabled: boolean;
+    headerValue: string;
+}

types/dom-navigation-preload/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "dom-navigation-preload-tests.ts"
+    ]
+}

types/dom-navigation-preload/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }