fix(mobile): pin fbjni to React Native version

apps/mobile/app.config.ts

@@ -422,6 +422,7 @@ const config: ExpoConfig = {
     "./plugins/withIosSceneLifecycle.cjs",
     "./plugins/withAndroidCleartextTraffic.cjs",
     "./plugins/withAndroidGradleHeap.cjs",
+    "./plugins/withAndroidFbjniVersion.cjs",
     "./plugins/withAndroidInputBackground.cjs",
     "./plugins/withAndroidModernPopupMenu.cjs",
     "./plugins/withAndroidModernAlertDialog.cjs",

apps/mobile/plugins/withAndroidFbjniVersion.cjs

@@ -0,0 +1,30 @@
+const { withProjectBuildGradle } = require("expo/config-plugins");
+
+const FBJNI_FORCE = "resolutionStrategy.force 'com.facebook.fbjni:fbjni:0.7.0'";
+
+module.exports = function withAndroidFbjniVersion(config) {
+  return withProjectBuildGradle(config, (nextConfig) => {
+    if (nextConfig.modResults.language !== "groovy") {
+      throw new Error("withAndroidFbjniVersion: project build.gradle must use Groovy.");
+    }
+
+    const contents = nextConfig.modResults.contents;
+    if (contents.includes(FBJNI_FORCE)) {
+      return nextConfig;
+    }
+
+    // react-native 0.86.3 requires fbjni 0.7.0. react-native-shiki-engine
+    // requests fbjni:+, whose NDK 28 binary is incompatible with RN's NDK 27
+    // libc++ and crashes before JavaScript starts.
+    nextConfig.modResults.contents = `${contents.trimEnd()}
+
+allprojects {
+  configurations.all {
+    ${FBJNI_FORCE}
+  }
+}
+`;
+
+    return nextConfig;
+  });
+};

apps/mobile/plugins/withAndroidFbjniVersion.test.mjs

@@ -0,0 +1,65 @@
+import * as NodeFS from "node:fs";
+import * as NodeModule from "node:module";
+import * as NodePath from "node:path";
+import { describe, expect, it } from "vitest";
+import withAndroidFbjniVersion from "./withAndroidFbjniVersion.cjs";
+
+const buildGradle = `buildscript {
+  repositories {
+    google()
+    mavenCentral()
+  }
+}
+
+allprojects {
+  repositories {
+    google()
+    mavenCentral()
+  }
+}
+`;
+
+async function transform(contents, language = "groovy") {
+  const config = withAndroidFbjniVersion({ name: "Test", slug: "test" });
+  const result = await config.mods.android.projectBuildGradle({
+    ...config,
+    modRequest: { platform: "android", modName: "projectBuildGradle", introspect: false },
+    modResults: { language, contents },
+  });
+  return result.modResults.contents;
+}
+
+describe("Android fbjni version generation", () => {
+  it("forces the React Native fbjni version and stays idempotent", async () => {
+    const generated = await transform(buildGradle);
+
+    expect(generated).toContain(
+      "resolutionStrategy.force 'com.facebook.fbjni:fbjni:0.7.0'",
+    );
+    expect(await transform(generated)).toBe(generated);
+  });
+
+
+  it("keeps the forced native library aligned with the installed React Native runtime", async () => {
+    const require = NodeModule.createRequire(import.meta.url);
+    const reactNativeRoot = NodePath.dirname(require.resolve("react-native/package.json"));
+    const versions = NodeFS.readFileSync(
+      NodePath.join(reactNativeRoot, "gradle/libs.versions.toml"),
+      "utf8",
+    );
+    const reactNativeFbjni = versions.match(/^fbjni\s*=\s*"([^"]+)"/m)?.[1];
+    expect(reactNativeFbjni).toBeDefined();
+
+    const generated = await transform(buildGradle);
+    const forcedFbjni = generated.match(
+      /resolutionStrategy\.force 'com\.facebook\.fbjni:fbjni:([^']+)'/,
+    )?.[1];
+    expect(forcedFbjni).toBe(reactNativeFbjni);
+  });
+
+  it("fails visibly if Expo switches the project build file away from Groovy", async () => {
+    await expect(transform(buildGradle, "kotlin")).rejects.toThrow(
+      "project build.gradle must use Groovy",
+    );
+  });
+});