From 02b42cfb3b0d30538802b79eae14a771279ff14d Mon Sep 17 00:00:00 2001
From: Ismar Besic <development@ismar.se>
Date: Mon, 26 Jan 2026 08:43:26 +0100
Subject: [PATCH 1/3] fix: hermes-compiler path for RN 0.82+ in the hermes
 bytecode plugin

---
 .changeset/cuddly-months-think.md               |  5 +++++
 .../utils/getHermesCLIPath.ts                   | 17 ++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/cuddly-months-think.md

diff --git a/.changeset/cuddly-months-think.md b/.changeset/cuddly-months-think.md
new file mode 100644
index 000000000..6f79b23d7
--- /dev/null
+++ b/.changeset/cuddly-months-think.md
@@ -0,0 +1,5 @@
+---
+"@callstack/repack": patch
+---
+
+Fix hermes-compiler path for RN 0.82+ in the hermes bytecode plugin
diff --git a/packages/repack/src/plugins/HermesBytecodePlugin/utils/getHermesCLIPath.ts b/packages/repack/src/plugins/HermesBytecodePlugin/utils/getHermesCLIPath.ts
index c5cad5b33..61b031414 100644
--- a/packages/repack/src/plugins/HermesBytecodePlugin/utils/getHermesCLIPath.ts
+++ b/packages/repack/src/plugins/HermesBytecodePlugin/utils/getHermesCLIPath.ts
@@ -1,3 +1,4 @@
+import fs from 'node:fs';
 import os from 'node:os';
 import path from 'node:path';
 
@@ -20,7 +21,7 @@ const getHermesOSBin = (): string | null => {
 /**
  * Determines the path to the Hermes compiler binary.
  *
- * Defaults to './node_modules/react-native/sdks/hermesc/{os-bin}/hermesc'
+ * Defaults to './node_modules/hermes-compiler/hermesc/{os-bin}/hermesc'
  */
 export const getHermesCLIPath = (reactNativePath: string): string => {
   const osBin = getHermesOSBin();
@@ -32,5 +33,19 @@ export const getHermesCLIPath = (reactNativePath: string): string => {
     );
   }
 
+  const hermesCompilerPath = path.join(
+    reactNativePath,
+    '..',
+    'hermes-compiler',
+    'hermesc',
+    osBin,
+    'hermesc'
+  );
+
+  if (fs.existsSync(hermesCompilerPath)) {
+    return hermesCompilerPath;
+  }
+
+  // Fallback to the previous hermesc path in older react native versions, <0.82.
   return path.join(reactNativePath, 'sdks', 'hermesc', osBin, 'hermesc');
 };

From 30321d1679ad1968c2fc79ddc153c85956467ea3 Mon Sep 17 00:00:00 2001
From: Ismar Besic <development@ismar.se>
Date: Mon, 2 Feb 2026 13:52:07 +0100
Subject: [PATCH 2/3] test: update mocks

---
 .../repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts    | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts b/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
index 10568640b..6f318f333 100644
--- a/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
+++ b/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
@@ -6,6 +6,7 @@ import { HermesBytecodePlugin } from '../HermesBytecodePlugin/index.js';
 jest.mock('node:fs', () => ({
   __esModule: true,
   default: {
+    existsSync: jest.fn(),
     promises: {
       access: jest.fn(),
       rename: jest.fn(),

From 29736500570359b6fce8aba6757ada4cd729c893 Mon Sep 17 00:00:00 2001
From: Ismar Besic <development@ismar.se>
Date: Mon, 2 Feb 2026 13:58:24 +0100
Subject: [PATCH 3/3] test: cover hermes cli path for older and newer react
 native versions

---
 .../__tests__/HermesBytecodePlugin.test.ts    | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts b/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
index 6f318f333..f93c32447 100644
--- a/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
+++ b/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
@@ -1,7 +1,9 @@
 import fs from 'node:fs';
+import os from 'node:os';
 import { type Compiler, ModuleFilenameHelpers } from '@rspack/core';
 import execa from 'execa';
 import { HermesBytecodePlugin } from '../HermesBytecodePlugin/index.js';
+import { getHermesCLIPath } from '../HermesBytecodePlugin/utils/getHermesCLIPath.js';
 
 jest.mock('node:fs', () => ({
   __esModule: true,
@@ -143,4 +145,30 @@ describe('HermesBytecodePlugin', () => {
       expect(execaMock.mock.calls[0][0]).toEqual('path/to/hermesc');
     });
   });
+
+  describe('getHermesCLIPath', () => {
+    const reactNativePath = 'path/to/react-native';
+
+    it('returns new hermes-compiler path when it exists', () => {
+      jest.spyOn(os, 'platform').mockReturnValue('darwin');
+      jest.mocked(fs.existsSync).mockReturnValue(true);
+
+      const hermesPath = getHermesCLIPath(reactNativePath);
+
+      expect(hermesPath).toBe(
+        'path/to/hermes-compiler/hermesc/osx-bin/hermesc'
+      );
+    });
+
+    it('falls back to legacy hermesc path when hermes-compiler does not exist', () => {
+      jest.spyOn(os, 'platform').mockReturnValue('darwin');
+      jest.mocked(fs.existsSync).mockReturnValue(false);
+
+      const hermesPath = getHermesCLIPath(reactNativePath);
+
+      expect(hermesPath).toBe(
+        'path/to/react-native/sdks/hermesc/osx-bin/hermesc'
+      );
+    });
+  });
 });