Ensure RCT_USE_PREBUILT_RNCORE is never enabled

Author: kraenhansen

packages/host/scripts/patch-hermes.rb

@@ -1,5 +1,9 @@
 Pod::UI.warn "!!! PATCHING HERMES WITH NODE-API SUPPORT !!!"
 
+if ENV['RCT_USE_PREBUILT_RNCORE'] == '1'
+  raise "React Native Node-API cannot reliably patch JSI when React Native Core is prebuilt."
+end
+
 VENDORED_HERMES_DIR ||= `npx react-native-node-api vendor-hermes --silent '#{Pod::Config.instance.installation_root}'`.strip
 if Dir.exist?(VENDORED_HERMES_DIR)
   Pod::UI.info "Hermes vendored into #{VENDORED_HERMES_DIR.inspect}"

packages/host/src/node/podspec.test.ts

@@ -0,0 +1,24 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import cp from "node:child_process";
+
+describe("Podspec", () => {
+  // We cannot support prebuilds of React Native Core since we're patching JSI
+  it(
+    "should error when RCT_USE_PREBUILT_RNCORE is set",
+    // We cannot call `pod` on non-macOS systems
+    { skip: process.platform !== "darwin" },
+    () => {
+      const { status, stdout } = cp.spawnSync("pod", ["spec", "lint"], {
+        env: { ...process.env, RCT_USE_PREBUILT_RNCORE: "1" },
+        encoding: "utf-8",
+      });
+
+      assert.notEqual(status, 0);
+      assert.match(
+        stdout,
+        /React Native Node-API cannot reliably patch JSI when React Native Core is prebuilt/,
+      );
+    },
+  );
+});