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packages/native/src/browser.ts

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+import type { NativeCapability } from "./types.ts";
+
+type ShareOptions = { title?: string; text?: string; url?: string };
+type PositionOptions = globalThis.PositionOptions;
+
+export const browserCapabilities: Record<string, NativeCapability> = {
+  "clipboard.write": {
+    browser: {
+      supported: () => typeof navigator !== "undefined" && !!navigator.clipboard?.writeText,
+      run: (options) =>
+        navigator.clipboard.writeText(String((options as { text?: unknown })?.text ?? "")),
+    },
+  },
+  share: {
+    browser: {
+      supported: () => typeof navigator !== "undefined" && typeof navigator.share === "function",
+      run: (options) => navigator.share(options as ShareOptions),
+    },
+  },
+  geolocation: {
+    browser: {
+      supported: () => typeof navigator !== "undefined" && !!navigator.geolocation,
+      run: (options) =>
+        new Promise((resolve, reject) =>
+          navigator.geolocation.getCurrentPosition(resolve, reject, options as PositionOptions),
+        ),
+    },
+  },
+  network: {
+    browser: {
+      supported: () => typeof navigator !== "undefined",
+      run: () => ({ connected: navigator.onLine }),
+    },
+  },
+  camera: {
+    browser: {
+      supported: () => typeof navigator !== "undefined" && !!navigator.mediaDevices?.getUserMedia,
+      run: (options) =>
+        navigator.mediaDevices.getUserMedia({ video: options ?? true, audio: false }),
+    },
+  },
+  "storage.get": {
+    browser: {
+      supported: () => typeof localStorage !== "undefined",
+      run: (options) => ({
+        value: localStorage.getItem(String((options as { key?: unknown })?.key ?? "")),
+      }),
+    },
+  },
+  "storage.set": {
+    browser: {
+      supported: () => typeof localStorage !== "undefined",
+      run: (options) => {
+        const value = options as { key?: unknown; value?: unknown };
+        localStorage.setItem(String(value?.key ?? ""), String(value?.value ?? ""));
+      },
+    },
+  },
+  "notifications.schedule": {
+    browser: {
+      supported: () => typeof Notification !== "undefined",
+      run: async (options) => {
+        if (Notification.permission === "default") await Notification.requestPermission();
+        if (Notification.permission !== "granted")
+          throw new Error("Notification permission was not granted");
+        const value = options as { title?: string; body?: string };
+        return new Notification(value?.title ?? "Notification", { body: value?.body });
+      },
+    },
+  },
+  "device.info": {
+    browser: {
+      supported: () => typeof navigator !== "undefined",
+      run: () => ({
+        platform: "web",
+        userAgent: navigator.userAgent,
+        language: navigator.language,
+      }),
+    },
+  },
+  haptics: {
+    browser: {
+      supported: () => typeof navigator !== "undefined" && typeof navigator.vibrate === "function",
+      run: (options) => navigator.vibrate((options as { duration?: number })?.duration ?? 20),
+    },
+  },
+  "filesystem.read": {
+    browser: {
+      supported: () => typeof window !== "undefined" && "showOpenFilePicker" in window,
+      run: async () => {
+        const picker = (
+          window as unknown as Window & {
+            showOpenFilePicker(): Promise<Array<{ getFile(): Promise<File> }>>;
+          }
+        ).showOpenFilePicker;
+        const [handle] = await picker.call(window);
+        return handle?.getFile();
+      },
+    },
+  },
+  "filesystem.write": {
+    browser: {
+      supported: () => typeof window !== "undefined" && "showSaveFilePicker" in window,
+      run: async (options) => {
+        const picker = (
+          window as unknown as Window & {
+            showSaveFilePicker(): Promise<{
+              createWritable(): Promise<{
+                write(value: unknown): Promise<void>;
+                close(): Promise<void>;
+              }>;
+            }>;
+          }
+        ).showSaveFilePicker;
+        const writable = await (await picker.call(window)).createWritable();
+        await writable.write((options as { data?: unknown })?.data ?? "");
+        await writable.close();
+      },
+    },
+  },
+};

packages/native/src/index.ts

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+import { browserCapabilities } from "./browser.ts";
+import { mobileCapabilities } from "./mobile.ts";
+import { isMobile, platform, register, registered, run, supports } from "./registry.ts";
+
+const names = new Set([...Object.keys(browserCapabilities), ...Object.keys(mobileCapabilities)]);
+for (const name of names) {
+  register(name, { ...browserCapabilities[name], ...mobileCapabilities[name] });
+}
+
+export * from "./types.ts";
+export {
+  NativeUnavailableError,
+  clearRegistry,
+  isMobile,
+  platform,
+  register,
+  registered,
+  run,
+  supports,
+} from "./registry.ts";
+export { browserCapabilities } from "./browser.ts";
+export { mobileCapabilities } from "./mobile.ts";
+
+export const native = { isMobile, platform, register, registered, run, supports };

packages/native/src/mobile.ts

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+import type { NativeCapability } from "./types.ts";
+
+type Plugin = Record<string, (...args: unknown[]) => unknown>;
+
+function plugin(name: string): Plugin | undefined {
+  const root = globalThis as typeof globalThis & {
+    Capacitor?: { Plugins?: Record<string, Plugin> };
+  };
+  return root.Capacitor?.Plugins?.[name];
+}
+
+function capacitorAdapter(pluginName: string, method: string): NativeCapability["mobile"] {
+  return {
+    supported: () => typeof plugin(pluginName)?.[method] === "function",
+    run: (options) => plugin(pluginName)![method]!(options),
+  };
+}
+
+function transformedCapacitorAdapter(
+  pluginName: string,
+  method: string,
+  transform: (options: unknown) => unknown,
+): NativeCapability["mobile"] {
+  return {
+    supported: () => typeof plugin(pluginName)?.[method] === "function",
+    run: (options) => plugin(pluginName)![method]!(transform(options)),
+  };
+}
+
+export const mobileCapabilities: Record<string, NativeCapability> = {
+  camera: { mobile: capacitorAdapter("Camera", "getPhoto") },
+  "clipboard.write": {
+    mobile: transformedCapacitorAdapter("Clipboard", "write", (options) => {
+      const value = options as { text?: unknown; string?: unknown };
+      return { string: String(value?.text ?? value?.string ?? "") };
+    }),
+  },
+  share: { mobile: capacitorAdapter("Share", "share") },
+  geolocation: { mobile: capacitorAdapter("Geolocation", "getCurrentPosition") },
+  network: { mobile: capacitorAdapter("Network", "getStatus") },
+  haptics: { mobile: capacitorAdapter("Haptics", "impact") },
+  "storage.get": { mobile: capacitorAdapter("Preferences", "get") },
+  "storage.set": { mobile: capacitorAdapter("Preferences", "set") },
+  "filesystem.read": { mobile: capacitorAdapter("Filesystem", "readFile") },
+  "filesystem.write": { mobile: capacitorAdapter("Filesystem", "writeFile") },
+  "notifications.schedule": {
+    mobile: transformedCapacitorAdapter("LocalNotifications", "schedule", (options) => {
+      const value = options as {
+        notifications?: unknown[];
+        id?: number;
+        title?: string;
+        body?: string;
+        schedule?: unknown;
+      };
+      if (value?.notifications) return value;
+      return {
+        notifications: [
+          {
+            id: value?.id ?? Date.now() % 2_147_483_647,
+            title: value?.title ?? "Notification",
+            body: value?.body ?? "",
+            schedule: value?.schedule,
+          },
+        ],
+      };
+    }),
+  },
+  "device.info": { mobile: capacitorAdapter("Device", "getInfo") },
+};

packages/native/src/registry.ts

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+import type {
+  NativeAdapter,
+  NativeCapability,
+  NativePlatform,
+  NativeRunOptions,
+  NativeTarget,
+  NativeBrowserRuntime,
+} from "./types.ts";
+
+export class NativeUnavailableError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = "NativeUnavailableError";
+  }
+}
+
+function capacitor():
+  | {
+      isNativePlatform?: () => boolean;
+      getPlatform?: () => string;
+    }
+  | undefined {
+  if (typeof globalThis === "undefined") return undefined;
+  return (globalThis as typeof globalThis & { Capacitor?: object }).Capacitor;
+}
+
+export function isMobile(): boolean {
+  const bridge = capacitor();
+  return (
+    bridge?.isNativePlatform?.() === true ||
+    ["ios", "android"].includes(bridge?.getPlatform?.() ?? "")
+  );
+}
+
+export function platform(): NativePlatform {
+  const bridge = capacitor();
+  if (isMobile()) return bridge?.getPlatform?.() ?? "webview";
+  return typeof window === "undefined" ? "server" : "browser";
+}
+
+const capabilities = new Map<string, NativeCapability>();
+
+function browserRuntime(): NativeBrowserRuntime | undefined {
+  if (typeof globalThis === "undefined") return undefined;
+  return (globalThis as typeof globalThis & { WrNexusNative?: NativeBrowserRuntime }).WrNexusNative;
+}
+
+function pendingRegistrations(): Map<string, NativeCapability> | undefined {
+  if (typeof window === "undefined") return undefined;
+  const root = globalThis as typeof globalThis & {
+    __WrNexusNativePending?: Map<string, NativeCapability>;
+  };
+  return (root.__WrNexusNativePending ??= new Map());
+}
+
+export function register<TOptions = unknown, TResult = unknown>(
+  name: string,
+  capability: NativeCapability<TOptions, TResult>,
+): () => void {
+  if (!/^[a-z][a-z0-9.-]*$/i.test(name))
+    throw new TypeError(`Invalid native capability name: ${name}`);
+  const value = capability as NativeCapability;
+  capabilities.set(name, value);
+  const runtime = browserRuntime();
+  if (runtime) runtime.register(name, value);
+  else pendingRegistrations()?.set(name, value);
+  return () => {
+    capabilities.delete(name);
+    const activeRuntime = browserRuntime();
+    if (activeRuntime) activeRuntime.unregister(name);
+    else pendingRegistrations()?.delete(name);
+  };
+}
+
+export function registered(): string[] {
+  return [...capabilities.keys()].sort();
+}
+
+function adapter(name: string, target: NativeTarget): NativeAdapter | undefined {
+  return capabilities.get(name)?.[target];
+}
+
+export function supports(
+  name: string,
+  target: NativeTarget = isMobile() ? "mobile" : "browser",
+): boolean {
+  const value = adapter(name, target);
+  return !!value && (value.supported?.() ?? true);
+}
+
+export async function run<TResult = unknown>(
+  name: string,
+  options?: unknown,
+  runOptions: NativeRunOptions = {},
+): Promise<TResult> {
+  const target = runOptions.target ?? (isMobile() ? "mobile" : "browser");
+  const value = adapter(name, target);
+  if (!value || !(value.supported?.() ?? true)) {
+    throw new NativeUnavailableError(`Native capability "${name}" is unavailable on ${target}`);
+  }
+  return (await value.run(options)) as TResult;
+}
+
+export function clearRegistry(): void {
+  capabilities.clear();
+}

packages/native/src/types.ts

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+export type NativePlatform = "server" | "browser" | "webview" | "ios" | "android" | "expo" | string;
+export type NativeTarget = "browser" | "mobile";
+
+export interface NativeAdapter<TOptions = unknown, TResult = unknown> {
+  supported?: () => boolean;
+  run(options?: TOptions): TResult | Promise<TResult>;
+}
+
+export interface NativeCapability<TOptions = unknown, TResult = unknown> {
+  browser?: NativeAdapter<TOptions, TResult>;
+  mobile?: NativeAdapter<TOptions, TResult>;
+}
+
+export interface NativeRunOptions {
+  target?: NativeTarget;
+}
+
+export interface NativeBrowserRuntime {
+  target: NativeTarget;
+  isMobile: boolean;
+  register(name: string, capability: NativeCapability): void;
+  unregister(name: string): void;
+  supports(name: string): boolean;
+  run<TResult = unknown>(name: string, options?: unknown): Promise<TResult>;
+}