From 4b33b023bf537b4d2433998bd89003171fd404f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rados=C5=82aw=20Rolka?= <radoslaw.rolka@gmail.com>
Date: Wed, 11 Feb 2026 10:20:46 +0100
Subject: [PATCH 1/4] create android cached rn project for building

---
 .github/workflows/build-library-android.yml |  6 +++
 .github/workflows/cache-rn-project.yml      | 56 +++++++++++++++++++++
 packages/builder/build-utils.ts             | 24 +++++----
 3 files changed, 76 insertions(+), 10 deletions(-)
 create mode 100644 .github/workflows/cache-rn-project.yml

diff --git a/.github/workflows/build-library-android.yml b/.github/workflows/build-library-android.yml
index de4e94cd..bdb90b36 100644
--- a/.github/workflows/build-library-android.yml
+++ b/.github/workflows/build-library-android.yml
@@ -57,6 +57,12 @@ jobs:
       - name: 📦 Install dependencies
         run: bun install
 
+      - name: ♻️ Restore RN project cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ runner.temp }}/rnrepo_build_app
+          key: rn-project-cache-android-${{ inputs.react_native_version }}
+
       - name: 🔨 Build library for Android
         run: bun run packages/builder/build-library-android.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"
 
diff --git a/.github/workflows/cache-rn-project.yml b/.github/workflows/cache-rn-project.yml
new file mode 100644
index 00000000..81b7cce7
--- /dev/null
+++ b/.github/workflows/cache-rn-project.yml
@@ -0,0 +1,56 @@
+name: Cache RN Project
+
+run-name: Cache RN project for RN@${{ inputs.react_native_version }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      react_native_version:
+        description: 'React Native version'
+        required: true
+        type: string
+
+jobs:
+  cache-rn-project:
+    runs-on: rnrepo-builder-ubuntu-latest
+    timeout-minutes: 60
+
+    steps:
+      - name: 🏗 Checkout repository
+        uses: actions/checkout@v4
+
+      - name: ☕ Setup Java JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: '17'
+
+      - name: 📱 Setup Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: ✅ Accept Android Licenses
+        run: |
+          yes | sdkmanager --licenses || true
+
+      - name: 🏗 Setup Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+
+      - name: 📦 Install dependencies
+        run: bun install
+
+      - name: 📱 Create RN project
+        run: |
+          work_dir="${{ runner.temp }}"
+          mkdir -p "$work_dir"
+          cd "$work_dir"
+          bunx @react-native-community/cli@latest init rnrepo_build_app --version "${{ inputs.react_native_version }}" --skip-install
+          cd "$work_dir/rnrepo_build_app"
+          npm install
+
+      - name: 📦 Cache RN project
+        uses: actions/cache@v4
+        with:
+          path: ${{ runner.temp }}/rnrepo_build_app
+          key: rn-project-cache-android-${{ inputs.react_native_version }}
diff --git a/packages/builder/build-utils.ts b/packages/builder/build-utils.ts
index 26110054..28c0621e 100644
--- a/packages/builder/build-utils.ts
+++ b/packages/builder/build-utils.ts
@@ -248,19 +248,23 @@ export async function setupReactNativeProject(
   const { mkdirSync } = await import('fs');
   mkdirSync(workDir, { recursive: true });
 
-  // Check that app directory doesn't exist yet
+  // If appDir already exists, assume it's a cached RN project and skip setup
   if (existsSync(appDir)) {
-    throw new Error(`App directory ${appDir} already exists.`);
-  }
+    console.log(`♻️ Using cached React Native project at ${appDir}`);
+  } else {
+    // Create RN project in the work directory
+    console.log(
+      `📱 Creating temporary React Native project (RN ${reactNativeVersion})...`
+    );
 
-  // Create RN project in the work directory
-  console.log(
-    `📱 Creating temporary React Native project (RN ${reactNativeVersion})...`
-  );
+    await $`bunx @react-native-community/cli@latest init rnrepo_build_app --version ${reactNativeVersion} --skip-install`
+      .cwd(workDir)
+      .quiet();
+  }
 
-  await $`bunx @react-native-community/cli@latest init rnrepo_build_app --version ${reactNativeVersion} --skip-install`
-    .cwd(workDir)
-    .quiet();
+  if (!existsSync(join(appDir, 'package.json'))) {
+    throw new Error(`Invalid React Native project at ${appDir}`);
+  }
 
   // Perform any library-specific setup before installing
   await installSetup(appDir, libraryName, 'preInstall');

From 2138c9209f3c57838c16087645c66ba0d960c466 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rados=C5=82aw=20Rolka?= <radoslaw.rolka@gmail.com>
Date: Wed, 11 Feb 2026 10:26:13 +0100
Subject: [PATCH 2/4] add cache for ios too

---
 .github/workflows/build-library-android.yml |  2 +-
 .github/workflows/build-library-ios.yml     |  6 ++++++
 .github/workflows/cache-rn-project.yml      | 22 +++++++--------------
 3 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/.github/workflows/build-library-android.yml b/.github/workflows/build-library-android.yml
index bdb90b36..a092ec4f 100644
--- a/.github/workflows/build-library-android.yml
+++ b/.github/workflows/build-library-android.yml
@@ -61,7 +61,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ${{ runner.temp }}/rnrepo_build_app
-          key: rn-project-cache-android-${{ inputs.react_native_version }}
+          key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
 
       - name: 🔨 Build library for Android
         run: bun run packages/builder/build-library-android.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"
diff --git a/.github/workflows/build-library-ios.yml b/.github/workflows/build-library-ios.yml
index 25867fc9..3fa43824 100644
--- a/.github/workflows/build-library-ios.yml
+++ b/.github/workflows/build-library-ios.yml
@@ -52,6 +52,12 @@ jobs:
       - name: 📦 Install dependencies
         run: bun install
 
+      - name: ♻️ Restore RN project cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ runner.temp }}/rnrepo_build_app
+          key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
+
       - name: 🔨 Build library for iOS
         run: bun run packages/builder/build-library-ios.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"
 
diff --git a/.github/workflows/cache-rn-project.yml b/.github/workflows/cache-rn-project.yml
index 81b7cce7..8cf2f088 100644
--- a/.github/workflows/cache-rn-project.yml
+++ b/.github/workflows/cache-rn-project.yml
@@ -12,26 +12,18 @@ on:
 
 jobs:
   cache-rn-project:
-    runs-on: rnrepo-builder-ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - rnrepo-builder-ubuntu-latest
+          - macos-latest
     timeout-minutes: 60
 
     steps:
       - name: 🏗 Checkout repository
         uses: actions/checkout@v4
 
-      - name: ☕ Setup Java JDK
-        uses: actions/setup-java@v4
-        with:
-          distribution: 'zulu'
-          java-version: '17'
-
-      - name: 📱 Setup Android SDK
-        uses: android-actions/setup-android@v3
-
-      - name: ✅ Accept Android Licenses
-        run: |
-          yes | sdkmanager --licenses || true
-
       - name: 🏗 Setup Bun
         uses: oven-sh/setup-bun@v1
         with:
@@ -53,4 +45,4 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ${{ runner.temp }}/rnrepo_build_app
-          key: rn-project-cache-android-${{ inputs.react_native_version }}
+          key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}

From bc53b7d974cd8724e9f9b4ca3f02a603c225e9ca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rados=C5=82aw=20Rolka?= <radoslaw.rolka@gmail.com>
Date: Wed, 11 Feb 2026 10:42:32 +0100
Subject: [PATCH 3/4] automate cache creation

---
 .github/workflows/build-library-android.yml | 11 +++++
 .github/workflows/build-library-ios.yml     | 11 +++++
 .github/workflows/cache-rn-project.yml      | 48 ---------------------
 3 files changed, 22 insertions(+), 48 deletions(-)
 delete mode 100644 .github/workflows/cache-rn-project.yml

diff --git a/.github/workflows/build-library-android.yml b/.github/workflows/build-library-android.yml
index a092ec4f..3626b56d 100644
--- a/.github/workflows/build-library-android.yml
+++ b/.github/workflows/build-library-android.yml
@@ -58,11 +58,22 @@ jobs:
         run: bun install
 
       - name: ♻️ Restore RN project cache
+        id: rn-project-cache
         uses: actions/cache@v4
         with:
           path: ${{ runner.temp }}/rnrepo_build_app
           key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
 
+      - name: 📱 Create RN project (cache miss)
+        if: steps.rn-project-cache.outputs.cache-hit != 'true'
+        run: |
+          work_dir="${{ runner.temp }}"
+          mkdir -p "$work_dir"
+          cd "$work_dir"
+          bunx @react-native-community/cli@latest init rnrepo_build_app --version "${{ inputs.react_native_version }}" --skip-install
+          cd "$work_dir/rnrepo_build_app"
+          npm install
+
       - name: 🔨 Build library for Android
         run: bun run packages/builder/build-library-android.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"
 
diff --git a/.github/workflows/build-library-ios.yml b/.github/workflows/build-library-ios.yml
index 3fa43824..8a05c60b 100644
--- a/.github/workflows/build-library-ios.yml
+++ b/.github/workflows/build-library-ios.yml
@@ -53,11 +53,22 @@ jobs:
         run: bun install
 
       - name: ♻️ Restore RN project cache
+        id: rn-project-cache
         uses: actions/cache@v4
         with:
           path: ${{ runner.temp }}/rnrepo_build_app
           key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
 
+      - name: 📱 Create RN project (cache miss)
+        if: steps.rn-project-cache.outputs.cache-hit != 'true'
+        run: |
+          work_dir="${{ runner.temp }}"
+          mkdir -p "$work_dir"
+          cd "$work_dir"
+          bunx @react-native-community/cli@latest init rnrepo_build_app --version "${{ inputs.react_native_version }}" --skip-install
+          cd "$work_dir/rnrepo_build_app"
+          npm install
+
       - name: 🔨 Build library for iOS
         run: bun run packages/builder/build-library-ios.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"
 
diff --git a/.github/workflows/cache-rn-project.yml b/.github/workflows/cache-rn-project.yml
deleted file mode 100644
index 8cf2f088..00000000
--- a/.github/workflows/cache-rn-project.yml
+++ /dev/null
@@ -1,48 +0,0 @@
-name: Cache RN Project
-
-run-name: Cache RN project for RN@${{ inputs.react_native_version }}
-
-on:
-  workflow_dispatch:
-    inputs:
-      react_native_version:
-        description: 'React Native version'
-        required: true
-        type: string
-
-jobs:
-  cache-rn-project:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os:
-          - rnrepo-builder-ubuntu-latest
-          - macos-latest
-    timeout-minutes: 60
-
-    steps:
-      - name: 🏗 Checkout repository
-        uses: actions/checkout@v4
-
-      - name: 🏗 Setup Bun
-        uses: oven-sh/setup-bun@v1
-        with:
-          bun-version: latest
-
-      - name: 📦 Install dependencies
-        run: bun install
-
-      - name: 📱 Create RN project
-        run: |
-          work_dir="${{ runner.temp }}"
-          mkdir -p "$work_dir"
-          cd "$work_dir"
-          bunx @react-native-community/cli@latest init rnrepo_build_app --version "${{ inputs.react_native_version }}" --skip-install
-          cd "$work_dir/rnrepo_build_app"
-          npm install
-
-      - name: 📦 Cache RN project
-        uses: actions/cache@v4
-        with:
-          path: ${{ runner.temp }}/rnrepo_build_app
-          key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}

From 878f6ffd4b6ba0aa88102406ca10fc37160de169 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rados=C5=82aw=20Rolka?= <radoslaw.rolka@gmail.com>
Date: Wed, 11 Feb 2026 10:59:09 +0100
Subject: [PATCH 4/4] save cache before changes

---
 .github/workflows/build-library-android.yml | 9 ++++++++-
 .github/workflows/build-library-ios.yml     | 9 ++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/build-library-android.yml b/.github/workflows/build-library-android.yml
index 3626b56d..07d671a9 100644
--- a/.github/workflows/build-library-android.yml
+++ b/.github/workflows/build-library-android.yml
@@ -59,7 +59,7 @@ jobs:
 
       - name: ♻️ Restore RN project cache
         id: rn-project-cache
-        uses: actions/cache@v4
+        uses: actions/cache/restore@v4
         with:
           path: ${{ runner.temp }}/rnrepo_build_app
           key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
@@ -74,6 +74,13 @@ jobs:
           cd "$work_dir/rnrepo_build_app"
           npm install
 
+      - name: 💾 Save RN project cache (clean)
+        if: steps.rn-project-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: ${{ runner.temp }}/rnrepo_build_app
+          key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
+
       - name: 🔨 Build library for Android
         run: bun run packages/builder/build-library-android.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"
 
diff --git a/.github/workflows/build-library-ios.yml b/.github/workflows/build-library-ios.yml
index 8a05c60b..455d7fd7 100644
--- a/.github/workflows/build-library-ios.yml
+++ b/.github/workflows/build-library-ios.yml
@@ -54,7 +54,7 @@ jobs:
 
       - name: ♻️ Restore RN project cache
         id: rn-project-cache
-        uses: actions/cache@v4
+        uses: actions/cache/restore@v4
         with:
           path: ${{ runner.temp }}/rnrepo_build_app
           key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
@@ -69,6 +69,13 @@ jobs:
           cd "$work_dir/rnrepo_build_app"
           npm install
 
+      - name: 💾 Save RN project cache (clean)
+        if: steps.rn-project-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: ${{ runner.temp }}/rnrepo_build_app
+          key: ${{ runner.os }}-rn-project-cache-${{ inputs.react_native_version }}
+
       - name: 🔨 Build library for iOS
         run: bun run packages/builder/build-library-ios.ts -- "${{ inputs.library_name }}" "${{ inputs.library_version }}" "${{ inputs.react_native_version }}" "${{ runner.temp }}" "${{ inputs.worklets_version }}"