chore: add prep script for Viewfinder (#1126)

Author: tido64

example/package.json

@@ -52,5 +52,37 @@
     "roots": [
       "test"
     ]
+  },
+  "rnx-kit": {
+    "//": "This configuration is only used for Viewfinder",
+    "kitType": "app",
+    "reactNativeVersion": "0.68",
+    "capabilities": [
+      "core-android",
+      "core-ios",
+      "core-macos",
+      "core-windows",
+      "animation",
+      "babel-preset-react-native",
+      "checkbox",
+      "clipboard",
+      "datetime-picker",
+      "filesystem",
+      "floating-action",
+      "gestures",
+      "html",
+      "masked-view",
+      "modal",
+      "navigation/native",
+      "navigation/stack",
+      "netinfo",
+      "popover",
+      "screens",
+      "shimmer",
+      "sqlite",
+      "storage",
+      "svg",
+      "webview"
+    ]
   }
 }

scripts/prepare-viewfinder.mjs

@@ -0,0 +1,64 @@
+#!/usr/bin/env node
+// @ts-check
+
+import { spawnSync } from "node:child_process";
+import * as fs from "node:fs";
+import * as path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const APP_IDENTIFIER = "com.microsoft.ReactNativeViewfinder";
+const PACKAGE_MANAGER = "yarn";
+
+const PROJECT_ROOT = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  ".."
+);
+const APP_ROOT = path.resolve(PROJECT_ROOT, "example");
+const APP_MANIFEST = path.resolve(APP_ROOT, "app.json");
+const PROJECT_MANIFEST = path.resolve(APP_ROOT, "package.json");
+
+/**
+ * Configures the app manifest for Viewfinder.
+ */
+function configureAppManifest() {
+  const original = JSON.parse(
+    fs.readFileSync(APP_MANIFEST, { encoding: "utf-8" })
+  );
+
+  const manifest = {
+    ...original,
+    $schema: undefined,
+    name: "Viewfinder",
+    displayName: "Viewfinder",
+    components: [],
+    android: {
+      package: APP_IDENTIFIER,
+    },
+    ios: {
+      bundleIdentifier: APP_IDENTIFIER,
+    },
+  };
+
+  fs.writeFileSync(APP_MANIFEST, JSON.stringify(manifest, null, 2) + "\n");
+}
+
+/**
+ * Runs the specified command.
+ * @param {string} command
+ * @param {string[]} args
+ * @param {Record<string, unknown>=} options
+ */
+function run(command, args, options) {
+  const { error, status } = spawnSync(command, args, {
+    cwd: PROJECT_ROOT,
+    stdio: "inherit",
+    ...options,
+  });
+  if (status !== 0) {
+    throw error ?? new Error(`Command failed: ${command} ${args.join(" ")}`);
+  }
+}
+
+configureAppManifest();
+run("npx", ["@rnx-kit/dep-check", "--write", PROJECT_MANIFEST]);
+run(PACKAGE_MANAGER, ["install"]);