From 4066adebf8a5de6268f7d54ef9725621eb6790c3 Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:04:29 +0200
Subject: [PATCH 1/9] Add CI workflow that builds the layer and tests it in the
 Lambda runtime image

---
 .github/workflows/test-layer.yml | 92 ++++++++++++++++++++++++++++++++
 README.md                        |  3 ++
 test/layer.test.js               | 86 +++++++++++++++++++++++++++++
 3 files changed, 181 insertions(+)
 create mode 100644 .github/workflows/test-layer.yml
 create mode 100644 test/layer.test.js

diff --git a/.github/workflows/test-layer.yml b/.github/workflows/test-layer.yml
new file mode 100644
index 0000000..bed73cb
--- /dev/null
+++ b/.github/workflows/test-layer.yml
@@ -0,0 +1,92 @@
+name: Test layer
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  SAM_CLI_TELEMETRY: 0
+  LAMBDA_IMAGE: public.ecr.aws/lambda/nodejs:24
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
+        with:
+          node-version: 24
+          cache: npm
+      - run: npm ci
+      - run: npm run lint
+
+  build-and-test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: aws-actions/setup-sam@v2
+        with:
+          use-installer: true
+
+      - name: Read pinned versions
+        run: |
+          echo "EXPECTED_SHARP_VERSION=$(sed -n 's/^SHARP_VERSION=//p' layer/Makefile)" >> "$GITHUB_ENV"
+          echo "EXPECTED_VIPS_VERSION=$(sed -n 's/^VIPS_VERSION=//p' layer/Makefile)" >> "$GITHUB_ENV"
+
+      # Same build image as the documented CodeBuild/SAM path. GitHub runners have 4 vCPUs / 16 GB,
+      # so the CodeBuild-oriented parallelism limits can be raised.
+      - name: Build layer
+        run: sam build --use-container --container-env-var BUILD_JOBS=4 --container-env-var LIBAOM_BUILD_JOBS=2
+
+      - name: Upload layer
+        uses: actions/upload-artifact@v4
+        with:
+          name: sharp-heic-layer-x86_64
+          path: .aws-sam/build/SharpHEICLayer
+          retention-days: 7
+
+      # The Lambda runtime image has no build toolchain or -devel packages, so any shared library
+      # missing from the layer's lib/ directory fails here.
+      - name: Test layer in Lambda runtime image
+        run: |
+          docker run --rm \
+            --entrypoint /var/lang/bin/node \
+            -v "$PWD/.aws-sam/build/SharpHEICLayer:/opt:ro" \
+            -v "$PWD:/work:ro" \
+            -e NODE_PATH=/opt/nodejs/node_modules \
+            -e LD_LIBRARY_PATH=/var/lang/lib:/lib64:/usr/lib64:/var/runtime:/var/runtime/lib:/var/task:/var/task/lib:/opt/lib \
+            -e EXPECTED_SHARP_VERSION -e EXPECTED_VIPS_VERSION \
+            "$LAMBDA_IMAGE" --test /work/test/layer.test.js
+
+      - name: Invoke example function via Lambda Runtime Interface Emulator
+        run: |
+          docker run -d --name lambda -p 9000:8080 \
+            -v "$PWD/.aws-sam/build/SharpHEICLayer:/opt:ro" \
+            -v "$PWD/examples/src:/var/task:ro" \
+            "$LAMBDA_IMAGE" index.handler
+          curl --silent --show-error --fail --retry 10 --retry-connrefused --retry-delay 1 \
+            -d '{}' http://localhost:9000/2015-03-31/functions/function/invocations > response.json
+          node -e '
+            const res = JSON.parse(require("fs").readFileSync("response.json", "utf8"));
+            if (res.statusCode !== 200) throw new Error("unexpected response: " + JSON.stringify(res).slice(0, 500));
+            if (res.headers["content-type"] !== "image/webp") throw new Error("unexpected content-type " + res.headers["content-type"]);
+            const body = Buffer.from(res.body, "base64");
+            if (body.toString("ascii", 0, 4) !== "RIFF" || body.toString("ascii", 8, 12) !== "WEBP") throw new Error("body is not a WebP image");
+            console.log("Lambda returned a WebP image of " + body.length + " bytes");
+          '
+
+      - name: Lambda container logs
+        if: always()
+        run: docker logs lambda 2>&1 || true
diff --git a/README.md b/README.md
index 0b1a5ec..ce6619b 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,9 @@ The environment variables are used to create a `samconfig.toml` file that config
 ### Note regarding build process
 Previously, some custom docker images were needed to build this layer. AWS now publishes managed SAM build images for current Lambda runtimes, including `public.ecr.aws/sam/build-nodejs24.x`.
 
+### Testing
+The [Test layer](.github/workflows/test-layer.yml) workflow builds the layer with `sam build --use-container` and mounts the result at `/opt` in the `public.ecr.aws/lambda/nodejs:24` runtime image. There it runs [test/layer.test.js](test/layer.test.js), which checks shared library resolution, the libvips and sharp versions, HEIC decoding, WebP resizing, and HEIF encoding with both HEVC and AV1. It also invokes the [example function](examples/src/index.js) through the Lambda Runtime Interface Emulator.
+
 ## Background
 This repo exists as it is rather painful to compile all libraries required to get sharp to work with HEIC/HEIF files in an AWS Lambda environment. The sharp repository has several [issues](https://github.com/lovell/sharp/issues) related to this.
 
diff --git a/test/layer.test.js b/test/layer.test.js
new file mode 100644
index 0000000..cf4d994
--- /dev/null
+++ b/test/layer.test.js
@@ -0,0 +1,86 @@
+// Smoke test for the built layer. Runs inside the public.ecr.aws/lambda/nodejs image
+// with the layer mounted at /opt, see .github/workflows/test-layer.yml.
+const assert = require('node:assert/strict');
+const { execFileSync } = require('node:child_process');
+const fs = require('node:fs');
+const path = require('node:path');
+const { test } = require('node:test');
+
+const LAYER_NODE_MODULES = '/opt/nodejs/node_modules';
+const TEST_IMAGE = path.resolve(__dirname, '../examples/src/test-input.heic');
+const TEST_IMAGE_WIDTH = 4032;
+const TEST_IMAGE_HEIGHT = 3024;
+
+const findSharpBinary = (dir) => {
+  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+    const full = path.join(dir, entry.name);
+    if (entry.isDirectory()) {
+      const found = findSharpBinary(full);
+      if (found) return found;
+    } else if (/(^|\/)Release\/sharp[^/]*\.node$/.test(full)) {
+      return full;
+    }
+  }
+  return null;
+};
+
+test('compiled sharp addon resolves all shared libraries', () => {
+  const binary = findSharpBinary(path.join(LAYER_NODE_MODULES, 'sharp'));
+  assert.ok(binary, 'compiled sharp addon not found in layer');
+
+  // ldd is not guaranteed to exist in the Lambda image, so ask the dynamic loader directly.
+  const loader = ['/lib64/ld-linux-x86-64.so.2', '/lib/ld-linux-aarch64.so.1'].find((p) => fs.existsSync(p));
+  assert.ok(loader, 'dynamic loader not found');
+  const output = execFileSync(loader, ['--list', binary], { encoding: 'utf8' });
+  console.log(output);
+  assert.doesNotMatch(output, /not found/);
+});
+
+test('sharp uses the libvips built for the layer', () => {
+  const sharp = require('sharp');
+  assert.equal(require('sharp/package.json').version, process.env.EXPECTED_SHARP_VERSION);
+  assert.equal(sharp.versions.vips, process.env.EXPECTED_VIPS_VERSION);
+  assert.ok(!fs.existsSync(path.join(LAYER_NODE_MODULES, '@img')), 'prebuilt @img/sharp-* packages must not be bundled');
+});
+
+test('sharp reports HEIF and WebP support', () => {
+  const { format } = require('sharp');
+  for (const name of ['heif', 'webp', 'jpeg', 'png']) {
+    assert.ok(format[name].input.buffer, `${name} input`);
+    assert.ok(format[name].output.buffer, `${name} output`);
+  }
+});
+
+test('decodes HEIC input', async () => {
+  const sharp = require('sharp');
+  const metadata = await sharp(TEST_IMAGE).metadata();
+  assert.equal(metadata.format, 'heif');
+  assert.equal(metadata.compression, 'hevc');
+  assert.equal(metadata.width, TEST_IMAGE_WIDTH);
+  assert.equal(metadata.height, TEST_IMAGE_HEIGHT);
+});
+
+test('resizes HEIC to WebP', async () => {
+  const sharp = require('sharp');
+  const { info } = await sharp(TEST_IMAGE).resize({ width: 200 }).webp().toBuffer({ resolveWithObject: true });
+  assert.equal(info.format, 'webp');
+  assert.equal(info.width, 200);
+  assert.equal(info.height, Math.round(200 * TEST_IMAGE_HEIGHT / TEST_IMAGE_WIDTH));
+});
+
+for (const { compression, encoder } of [
+  { compression: 'hevc', encoder: 'x265' },
+  { compression: 'av1', encoder: 'libaom' },
+]) {
+  test(`encodes and decodes HEIF with ${compression} (${encoder})`, async () => {
+    const sharp = require('sharp');
+    const encoded = await sharp(TEST_IMAGE).resize({ width: 320 }).heif({ compression, quality: 50 }).toBuffer();
+    const metadata = await sharp(encoded).metadata();
+    assert.equal(metadata.format, 'heif');
+    assert.equal(metadata.compression, compression);
+    assert.equal(metadata.width, 320);
+
+    const { info } = await sharp(encoded).png().toBuffer({ resolveWithObject: true });
+    assert.equal(info.width, 320);
+  });
+}

From f69b12be3dea746ccd74021c5c97cf8500fa3a3c Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:06:45 +0200
Subject: [PATCH 2/9] Bump GitHub Actions to latest major versions

---
 .github/workflows/test-layer.yml | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/test-layer.yml b/.github/workflows/test-layer.yml
index bed73cb..8b5f0d4 100644
--- a/.github/workflows/test-layer.yml
+++ b/.github/workflows/test-layer.yml
@@ -22,8 +22,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v7
         with:
           node-version: 24
           cache: npm
@@ -34,9 +34,9 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 120
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
 
-      - uses: aws-actions/setup-sam@v2
+      - uses: aws-actions/setup-sam@v3
         with:
           use-installer: true
 
@@ -51,7 +51,7 @@ jobs:
         run: sam build --use-container --container-env-var BUILD_JOBS=4 --container-env-var LIBAOM_BUILD_JOBS=2
 
       - name: Upload layer
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: sharp-heic-layer-x86_64
           path: .aws-sam/build/SharpHEICLayer

From 3790c93238ad070becc2cd94a83ad0ef30632e4e Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:11:41 +0200
Subject: [PATCH 3/9] Remove eslint in favor of node --check

eslint was the only dependency of the root package and the source of all
open Dependabot alerts (transitive deps in package-lock.json). node --check
gives the same syntax check without installing anything.
---
 .github/workflows/test-layer.yml |    6 +-
 buildspec.yml                    |    4 +-
 eslint.config.js                 |    8 -
 package-lock.json                | 1076 ------------------------------
 package.json                     |    7 +-
 5 files changed, 5 insertions(+), 1096 deletions(-)
 delete mode 100644 eslint.config.js

diff --git a/.github/workflows/test-layer.yml b/.github/workflows/test-layer.yml
index 8b5f0d4..a89d959 100644
--- a/.github/workflows/test-layer.yml
+++ b/.github/workflows/test-layer.yml
@@ -18,7 +18,7 @@ env:
   LAMBDA_IMAGE: public.ecr.aws/lambda/nodejs:24
 
 jobs:
-  lint:
+  syntax-check:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
@@ -26,9 +26,7 @@ jobs:
       - uses: actions/setup-node@v7
         with:
           node-version: 24
-          cache: npm
-      - run: npm ci
-      - run: npm run lint
+      - run: npm test
 
   build-and-test:
     runs-on: ubuntu-latest
diff --git a/buildspec.yml b/buildspec.yml
index a0a3c96..0105cc1 100644
--- a/buildspec.yml
+++ b/buildspec.yml
@@ -27,8 +27,8 @@ phases:
       - NODE_ENV=development npm ci
       - 'echo "==> Pre-build phase: audit dependencies"'
       - npm audit --audit-level=moderate
-      - 'echo "==> Pre-build phase: lint"'
-      - npm run lint
+      - 'echo "==> Pre-build phase: syntax check"'
+      - npm test
   build:
     commands:
       - 'echo "==> Build phase: sam build"'
diff --git a/eslint.config.js b/eslint.config.js
deleted file mode 100644
index ef6d27a..0000000
--- a/eslint.config.js
+++ /dev/null
@@ -1,8 +0,0 @@
-module.exports = [
-  {
-    languageOptions: {
-      ecmaVersion: 2022,
-      sourceType: 'script',
-    },
-  },
-];
diff --git a/package-lock.json b/package-lock.json
index aaf103e..9ba2a60 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,1085 +8,9 @@
       "name": "sharp-heic-lambda-layer",
       "version": "4.2.0",
       "license": "MIT",
-      "devDependencies": {
-        "eslint": "^9.38.0"
-      },
       "engines": {
         "node": ">=22.11"
       }
-    },
-    "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.9.0",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.0.tgz",
-      "integrity": "sha512-ayVFHdtZ+hsq1t2Dy24wCmGXGe4q9Gu3smhLYALJrr473ZH27MsnSL+LKUlimp4BWJqMDMLmPpx/Q9R3OAlL4g==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "eslint-visitor-keys": "^3.4.3"
-      },
-      "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
-      },
-      "peerDependencies": {
-        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
-      }
-    },
-    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
-      "version": "3.4.3",
-      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
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-      "dev": true,
-      "license": "Apache-2.0",
-      "engines": {
-        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
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-      "funding": {
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-      }
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diff --git a/package.json b/package.json
index a66ba0b..2be2b32 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,7 @@
   "description": "Lambda Layer providing sharp with HEIC support",
   "main": "index.js",
   "scripts": {
-    "test": "npm run lint",
-    "lint": "npx eslint .",
-    "lint:fix": "npx eslint --fix .",
+    "test": "node --check deployment/createSAMConfiguration.js && node --check examples/src/index.js && node --check test/layer.test.js",
     "build": "sam build",
     "prepackage": "node deployment/createSAMConfiguration.js > samconfig.toml",
     "package": "sam package",
@@ -26,8 +24,5 @@
   "homepage": "https://github.com/zoellner/sharp-heic-lambda-layer#readme",
   "engines": {
     "node": ">=22.11"
-  },
-  "devDependencies": {
-    "eslint": "^9.38.0"
   }
 }

From 779efe2544aad94f3e90a4db274b386c3aba55fe Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:20:57 +0200
Subject: [PATCH 4/9] Fix layer test: read sharp version from disk, correct
 test image dimensions, set x265-compatible tune

---
 test/layer.test.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/test/layer.test.js b/test/layer.test.js
index cf4d994..28cf494 100644
--- a/test/layer.test.js
+++ b/test/layer.test.js
@@ -8,8 +8,8 @@ const { test } = require('node:test');
 
 const LAYER_NODE_MODULES = '/opt/nodejs/node_modules';
 const TEST_IMAGE = path.resolve(__dirname, '../examples/src/test-input.heic');
-const TEST_IMAGE_WIDTH = 4032;
-const TEST_IMAGE_HEIGHT = 3024;
+const TEST_IMAGE_WIDTH = 3024;
+const TEST_IMAGE_HEIGHT = 4032;
 
 const findSharpBinary = (dir) => {
   for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
@@ -38,7 +38,8 @@ test('compiled sharp addon resolves all shared libraries', () => {
 
 test('sharp uses the libvips built for the layer', () => {
   const sharp = require('sharp');
-  assert.equal(require('sharp/package.json').version, process.env.EXPECTED_SHARP_VERSION);
+  const { version } = JSON.parse(fs.readFileSync(path.join(LAYER_NODE_MODULES, 'sharp/package.json'), 'utf8'));
+  assert.equal(version, process.env.EXPECTED_SHARP_VERSION);
   assert.equal(sharp.versions.vips, process.env.EXPECTED_VIPS_VERSION);
   assert.ok(!fs.existsSync(path.join(LAYER_NODE_MODULES, '@img')), 'prebuilt @img/sharp-* packages must not be bundled');
 });
@@ -68,13 +69,14 @@ test('resizes HEIC to WebP', async () => {
   assert.equal(info.height, Math.round(200 * TEST_IMAGE_HEIGHT / TEST_IMAGE_WIDTH));
 });
 
-for (const { compression, encoder } of [
-  { compression: 'hevc', encoder: 'x265' },
-  { compression: 'av1', encoder: 'libaom' },
+for (const { compression, encoder, options } of [
+  // sharp defaults to tune 'auto', which libheif's x265 plugin rejects (only psnr, ssim, grain, fastdecode).
+  { compression: 'hevc', encoder: 'x265', options: { tune: 'ssim' } },
+  { compression: 'av1', encoder: 'libaom', options: {} },
 ]) {
   test(`encodes and decodes HEIF with ${compression} (${encoder})`, async () => {
     const sharp = require('sharp');
-    const encoded = await sharp(TEST_IMAGE).resize({ width: 320 }).heif({ compression, quality: 50 }).toBuffer();
+    const encoded = await sharp(TEST_IMAGE).resize({ width: 320 }).heif({ compression, quality: 50, ...options }).toBuffer();
     const metadata = await sharp(encoded).metadata();
     assert.equal(metadata.format, 'heif');
     assert.equal(metadata.compression, compression);

From 3ec3a766be7097ab36b76b98036d7d04f7f24bb5 Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:22:21 +0200
Subject: [PATCH 5/9] Do not upload the compiled layer as a workflow artifact

---
 .github/workflows/test-layer.yml | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/test-layer.yml b/.github/workflows/test-layer.yml
index a89d959..ba5ca77 100644
--- a/.github/workflows/test-layer.yml
+++ b/.github/workflows/test-layer.yml
@@ -28,6 +28,8 @@ jobs:
           node-version: 24
       - run: npm test
 
+  # The compiled layer must not be published (codec licensing), so it is never uploaded as an
+  # artifact or cached; it only exists on the ephemeral runner for the duration of this job.
   build-and-test:
     runs-on: ubuntu-latest
     timeout-minutes: 120
@@ -48,13 +50,6 @@ jobs:
       - name: Build layer
         run: sam build --use-container --container-env-var BUILD_JOBS=4 --container-env-var LIBAOM_BUILD_JOBS=2
 
-      - name: Upload layer
-        uses: actions/upload-artifact@v7
-        with:
-          name: sharp-heic-layer-x86_64
-          path: .aws-sam/build/SharpHEICLayer
-          retention-days: 7
-
       # The Lambda runtime image has no build toolchain or -devel packages, so any shared library
       # missing from the layer's lib/ directory fails here.
       - name: Test layer in Lambda runtime image

From 29ce09452f4cc0eb6add5e4e9b7ab8f5f1c5fcdf Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:32:45 +0200
Subject: [PATCH 6/9] Only flag prebuilt @img/sharp-* packages in layer test

---
 test/layer.test.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/layer.test.js b/test/layer.test.js
index 28cf494..9b50ec3 100644
--- a/test/layer.test.js
+++ b/test/layer.test.js
@@ -41,7 +41,10 @@ test('sharp uses the libvips built for the layer', () => {
   const { version } = JSON.parse(fs.readFileSync(path.join(LAYER_NODE_MODULES, 'sharp/package.json'), 'utf8'));
   assert.equal(version, process.env.EXPECTED_SHARP_VERSION);
   assert.equal(sharp.versions.vips, process.env.EXPECTED_VIPS_VERSION);
-  assert.ok(!fs.existsSync(path.join(LAYER_NODE_MODULES, '@img')), 'prebuilt @img/sharp-* packages must not be bundled');
+  // @img/colour is a regular JS dependency; only the prebuilt @img/sharp-* binaries must be absent.
+  const scope = path.join(LAYER_NODE_MODULES, '@img');
+  const prebuilt = fs.existsSync(scope) ? fs.readdirSync(scope).filter((name) => name.startsWith('sharp-')) : [];
+  assert.deepEqual(prebuilt, [], 'prebuilt @img/sharp-* packages must not be bundled');
 });
 
 test('sharp reports HEIF and WebP support', () => {

From 51a475c8526c0c926861a90d873fdc9a1ca424b8 Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:47:13 +0200
Subject: [PATCH 7/9] Verify decoded pixel colours using a synthetic HEIC
 fixture

---
 README.md                            |   2 +-
 package.json                         |   2 +-
 test/fixtures/make-quadrants-heic.js |  47 +++++++++++++++++++++++++++
 test/fixtures/quadrants.heic         | Bin 0 -> 865 bytes
 test/fixtures/quadrants.js           |  11 +++++++
 test/layer.test.js                   |  46 +++++++++++++++++++++++---
 6 files changed, 101 insertions(+), 7 deletions(-)
 create mode 100644 test/fixtures/make-quadrants-heic.js
 create mode 100644 test/fixtures/quadrants.heic
 create mode 100644 test/fixtures/quadrants.js

diff --git a/README.md b/README.md
index ce6619b..51e0e86 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ The environment variables are used to create a `samconfig.toml` file that config
 Previously, some custom docker images were needed to build this layer. AWS now publishes managed SAM build images for current Lambda runtimes, including `public.ecr.aws/sam/build-nodejs24.x`.
 
 ### Testing
-The [Test layer](.github/workflows/test-layer.yml) workflow builds the layer with `sam build --use-container` and mounts the result at `/opt` in the `public.ecr.aws/lambda/nodejs:24` runtime image. There it runs [test/layer.test.js](test/layer.test.js), which checks shared library resolution, the libvips and sharp versions, HEIC decoding, WebP resizing, and HEIF encoding with both HEVC and AV1. It also invokes the [example function](examples/src/index.js) through the Lambda Runtime Interface Emulator.
+The [Test layer](.github/workflows/test-layer.yml) workflow builds the layer with `sam build --use-container` and mounts the result at `/opt` in the `public.ecr.aws/lambda/nodejs:24` runtime image. There it runs [test/layer.test.js](test/layer.test.js), which checks shared library resolution, the libvips and sharp versions, HEIC decoding, WebP resizing, and HEIF encoding with both HEVC and AV1. Pixel colours are verified against [test/fixtures/quadrants.heic](test/fixtures/quadrants.heic), a synthetic image encoded with macOS `sips` (regenerate with `node test/fixtures/make-quadrants-heic.js`). It also invokes the [example function](examples/src/index.js) through the Lambda Runtime Interface Emulator.
 
 ## Background
 This repo exists as it is rather painful to compile all libraries required to get sharp to work with HEIC/HEIF files in an AWS Lambda environment. The sharp repository has several [issues](https://github.com/lovell/sharp/issues) related to this.
diff --git a/package.json b/package.json
index 2be2b32..20f9ee8 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "Lambda Layer providing sharp with HEIC support",
   "main": "index.js",
   "scripts": {
-    "test": "node --check deployment/createSAMConfiguration.js && node --check examples/src/index.js && node --check test/layer.test.js",
+    "test": "node --check deployment/createSAMConfiguration.js && node --check examples/src/index.js && node --check test/layer.test.js && node --check test/fixtures/quadrants.js && node --check test/fixtures/make-quadrants-heic.js",
     "build": "sam build",
     "prepackage": "node deployment/createSAMConfiguration.js > samconfig.toml",
     "package": "sam package",
diff --git a/test/fixtures/make-quadrants-heic.js b/test/fixtures/make-quadrants-heic.js
new file mode 100644
index 0000000..28b811a
--- /dev/null
+++ b/test/fixtures/make-quadrants-heic.js
@@ -0,0 +1,47 @@
+// Generates test/fixtures/quadrants.heic: a 480x320 image with one solid colour per quadrant.
+// Encoded with Apple's HEIF encoder (macOS sips) so the fixture is independent of the libheif/x265
+// build under test. Usage (macOS only): node test/fixtures/make-quadrants-heic.js
+const { execFileSync } = require('node:child_process');
+const fs = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+const zlib = require('node:zlib');
+
+const { WIDTH, HEIGHT, QUADRANTS } = require('./quadrants.js');
+
+const chunk = (type, data) => {
+  const body = Buffer.concat([Buffer.from(type, 'ascii'), data]);
+  const length = Buffer.alloc(4);
+  length.writeUInt32BE(data.length);
+  const crc = Buffer.alloc(4);
+  crc.writeUInt32BE(zlib.crc32(body));
+  return Buffer.concat([length, body, crc]);
+};
+
+const header = Buffer.alloc(13);
+header.writeUInt32BE(WIDTH, 0);
+header.writeUInt32BE(HEIGHT, 4);
+header.set([8, 2, 0, 0, 0], 8); // 8-bit RGB, no interlace
+
+const rows = [];
+for (let y = 0; y < HEIGHT; y++) {
+  const row = Buffer.alloc(1 + WIDTH * 3); // leading 0 = no filter
+  for (let x = 0; x < WIDTH; x++) {
+    const { rgb } = QUADRANTS.find((q) => q.x === (x < WIDTH / 2 ? 0 : 1) && q.y === (y < HEIGHT / 2 ? 0 : 1));
+    row.set(rgb, 1 + x * 3);
+  }
+  rows.push(row);
+}
+
+const png = Buffer.concat([
+  Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]),
+  chunk('IHDR', header),
+  chunk('IDAT', zlib.deflateSync(Buffer.concat(rows))),
+  chunk('IEND', Buffer.alloc(0)),
+]);
+
+const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'quadrants-'));
+const pngPath = path.join(tmp, 'quadrants.png');
+fs.writeFileSync(pngPath, png);
+execFileSync('sips', ['-s', 'format', 'heic', '-s', 'formatOptions', 'best', pngPath, '--out', path.join(__dirname, 'quadrants.heic')], { stdio: 'inherit' });
+fs.rmSync(tmp, { recursive: true });
diff --git a/test/fixtures/quadrants.heic b/test/fixtures/quadrants.heic
new file mode 100644
index 0000000000000000000000000000000000000000..9577b2740121aa31bd47555d1b86c9ce4a8b57fd
GIT binary patch
literal 865
zcmZQzU{FabsVvAy%}izhg51nBL*GmfSKrKlqTI~HG>AB3OKxgOB1j$x6f;tCiXcn|
zhJwuG5*QmstE6P+r2#oIDMhIu8Uz@Dn5VQTM*+&_E66O#1+pPB%9#)y5S}QIlgb2@
z%P31W1Tmjv78Df#>BE@?$@xH9I5|J3C@(puf`JJL*&2XCJjppZnGB~H9Dr<*%;JJn
zAPoeJ4}jPK$l%N@$_G1Epdhm%6DYvI%)!9{r1F85I5V<<nEOBkgZ&4FKmULHU|`^8
zUI28uxC0{(<NyC41<YU-%s?gLOb!cya*9rjV4Vnw35*XJ7Hnktu5@VG0|$o#0*ipE
zI9(VIBwP__TB!guT{5#E7Z#X|42*1zOw6opEkFsm%$$61EVzII0u*FG%(w%HSAy8N
zDT&aqX50znF4bUMr{QW55#ZtLU|^x6_ose0_x=B$7TK5!+tvL1;@&T3Q}OZi{Qp1C
zrvCpw@#E|x<@alUs!Z}!nWXamzo;2Q>`mc~Sv#K!&04l{Rn~$IC5|Qq5b<uA!tbN+
zlOG?m4?OZw&Tw%?iQ7L72F~*2ov(wGkN3;jt`1upwKXe&|Kp1K|Emj2HN8SOoCI3f
zJ1;f;|9}7V`^)dU?|#oN+YUsz+it_qfdyR8Za-PXz?5~=cEerch*Q9@<d9gkD{VuA
zI51jE9j2^NU|@dBz)*Cc9Tdtw4GhK$E*JFl#Q*=@ozwMt-LBWa-|zeVegoq_BL}AQ
zVtwir&U>nbH(CRc+{gDY<frb%{r|tKUF*;DC;#vt03nHkJusxyQ2Hn27z4xcMS{H-
zD;XG_tvXjv=x<#L1m7TF>ztPG|9|2Sm9b`heSLlXv$M0!a&A^x%N>yU67nK{p3Js=
z>sP<}b)Z3kgNdO*f&DLQ=8U-xyffxDFd8v%10#x=S%u+o128E{u!}G-C|PJI007am
BAMpSH

literal 0
HcmV?d00001

diff --git a/test/fixtures/quadrants.js b/test/fixtures/quadrants.js
new file mode 100644
index 0000000..7ad47a5
--- /dev/null
+++ b/test/fixtures/quadrants.js
@@ -0,0 +1,11 @@
+// Layout of test/fixtures/quadrants.heic, shared by the generator and the layer test.
+module.exports = {
+  WIDTH: 480,
+  HEIGHT: 320,
+  QUADRANTS: [
+    { name: 'top-left', x: 0, y: 0, rgb: [220, 40, 40] },
+    { name: 'top-right', x: 1, y: 0, rgb: [40, 200, 60] },
+    { name: 'bottom-left', x: 0, y: 1, rgb: [40, 60, 220] },
+    { name: 'bottom-right', x: 1, y: 1, rgb: [230, 210, 40] },
+  ],
+};
diff --git a/test/layer.test.js b/test/layer.test.js
index 9b50ec3..b24b850 100644
--- a/test/layer.test.js
+++ b/test/layer.test.js
@@ -11,6 +11,24 @@ const TEST_IMAGE = path.resolve(__dirname, '../examples/src/test-input.heic');
 const TEST_IMAGE_WIDTH = 3024;
 const TEST_IMAGE_HEIGHT = 4032;
 
+// Synthetic HEIC with one solid colour per quadrant, see test/fixtures/make-quadrants-heic.js.
+const QUADRANTS_IMAGE = path.resolve(__dirname, 'fixtures/quadrants.heic');
+const QUADRANTS_LAYOUT = require('./fixtures/quadrants.js');
+
+// Samples the centre of each quadrant, which also catches flipped or rotated output.
+const assertQuadrantColours = async (input, tolerance) => {
+  const sharp = require('sharp');
+  const { data, info } = await sharp(input).removeAlpha().raw().toBuffer({ resolveWithObject: true });
+  for (const { name, x, y, rgb } of QUADRANTS_LAYOUT.QUADRANTS) {
+    const cx = Math.floor((x + 0.5) * info.width / 2);
+    const cy = Math.floor((y + 0.5) * info.height / 2);
+    const i = (cy * info.width + cx) * info.channels;
+    const actual = [data[i], data[i + 1], data[i + 2]];
+    const ok = actual.every((value, c) => Math.abs(value - rgb[c]) <= tolerance);
+    assert.ok(ok, `${name}: expected ${rgb} ±${tolerance}, got ${actual}`);
+  }
+};
+
 const findSharpBinary = (dir) => {
   for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
     const full = path.join(dir, entry.name);
@@ -64,6 +82,25 @@ test('decodes HEIC input', async () => {
   assert.equal(metadata.height, TEST_IMAGE_HEIGHT);
 });
 
+test('decodes synthetic HEIC with correct dimensions and colours', async () => {
+  const sharp = require('sharp');
+  const metadata = await sharp(QUADRANTS_IMAGE).metadata();
+  assert.equal(metadata.format, 'heif');
+  assert.equal(metadata.compression, 'hevc');
+  assert.equal(metadata.width, QUADRANTS_LAYOUT.WIDTH);
+  assert.equal(metadata.height, QUADRANTS_LAYOUT.HEIGHT);
+  await assertQuadrantColours(QUADRANTS_IMAGE, 8);
+});
+
+test('resizes synthetic HEIC to WebP with correct colours', async () => {
+  const sharp = require('sharp');
+  const { data, info } = await sharp(QUADRANTS_IMAGE).resize({ width: 240 }).webp().toBuffer({ resolveWithObject: true });
+  assert.equal(info.format, 'webp');
+  assert.equal(info.width, 240);
+  assert.equal(info.height, 160);
+  await assertQuadrantColours(data, 12);
+});
+
 test('resizes HEIC to WebP', async () => {
   const sharp = require('sharp');
   const { info } = await sharp(TEST_IMAGE).resize({ width: 200 }).webp().toBuffer({ resolveWithObject: true });
@@ -79,13 +116,12 @@ for (const { compression, encoder, options } of [
 ]) {
   test(`encodes and decodes HEIF with ${compression} (${encoder})`, async () => {
     const sharp = require('sharp');
-    const encoded = await sharp(TEST_IMAGE).resize({ width: 320 }).heif({ compression, quality: 50, ...options }).toBuffer();
+    const encoded = await sharp(QUADRANTS_IMAGE).heif({ compression, quality: 80, ...options }).toBuffer();
     const metadata = await sharp(encoded).metadata();
     assert.equal(metadata.format, 'heif');
     assert.equal(metadata.compression, compression);
-    assert.equal(metadata.width, 320);
-
-    const { info } = await sharp(encoded).png().toBuffer({ resolveWithObject: true });
-    assert.equal(info.width, 320);
+    assert.equal(metadata.width, QUADRANTS_LAYOUT.WIDTH);
+    assert.equal(metadata.height, QUADRANTS_LAYOUT.HEIGHT);
+    await assertQuadrantColours(encoded, 12);
   });
 }

From 7df49e4df8a9d45db96bff6071984bbe7e5fb9de Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Thu, 8 Oct 2026 23:55:57 +0200
Subject: [PATCH 8/9] Link sharp issue for the x265 tune workaround

---
 test/layer.test.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/layer.test.js b/test/layer.test.js
index b24b850..c4f2ea5 100644
--- a/test/layer.test.js
+++ b/test/layer.test.js
@@ -111,6 +111,7 @@ test('resizes HEIC to WebP', async () => {
 
 for (const { compression, encoder, options } of [
   // sharp defaults to tune 'auto', which libheif's x265 plugin rejects (only psnr, ssim, grain, fastdecode).
+  // https://github.com/lovell/sharp/issues/4621
   { compression: 'hevc', encoder: 'x265', options: { tune: 'ssim' } },
   { compression: 'av1', encoder: 'libaom', options: {} },
 ]) {

From cb51689591a602543843a96ff2a6de2ab118e061 Mon Sep 17 00:00:00 2001
From: Andreas Zoellner <andreaszoellner@gmail.com>
Date: Fri, 9 Oct 2026 09:56:24 +0200
Subject: [PATCH 9/9] Skip the layer build when no layer-relevant files
 changed; document HEVC tune workaround

---
 .github/workflows/test-layer.yml | 28 ++++++++++++++++++++++++++++
 README.md                        |  3 ++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/test-layer.yml b/.github/workflows/test-layer.yml
index ba5ca77..6e517fc 100644
--- a/.github/workflows/test-layer.yml
+++ b/.github/workflows/test-layer.yml
@@ -28,9 +28,37 @@ jobs:
           node-version: 24
       - run: npm test
 
+  # Decides whether the layer needs to be rebuilt. The workflow itself always runs because its jobs
+  # are required checks; a job skipped via `if` counts as passing, a workflow that never starts does not.
+  changes:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    outputs:
+      layer: ${{ steps.filter.outputs.layer }}
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
+      - id: filter
+        env:
+          BASE_SHA: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}
+        run: |
+          if [ "$GITHUB_EVENT_NAME" = workflow_dispatch ] || ! git cat-file -e "${BASE_SHA}^{commit}" 2>/dev/null; then
+            echo "layer=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          git diff --name-only "$BASE_SHA" "$GITHUB_SHA" | tee changed-files.txt
+          if grep -qE '^(layer/|test/|examples/src/|template\.yaml$|\.github/workflows/test-layer\.yml$)' changed-files.txt; then
+            echo "layer=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "layer=false" >> "$GITHUB_OUTPUT"
+          fi
+
   # The compiled layer must not be published (codec licensing), so it is never uploaded as an
   # artifact or cached; it only exists on the ephemeral runner for the duration of this job.
   build-and-test:
+    needs: changes
+    if: needs.changes.outputs.layer == 'true'
     runs-on: ubuntu-latest
     timeout-minutes: 120
     steps:
diff --git a/README.md b/README.md
index 51e0e86..9a81ac6 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ sam deploy --guided
 ### Lambda Layer
 - Add the lambda layer with ARN `arn:aws:lambda:us-east-1:${AWS:AccountId}:layer:sharp-heic:${LAYER_VERSION}` to any lambda function (replace `${LAYER_VERSION}` with the appropriate version and `${AWS:AccountId}` if you're not using a layer from the same account as the function). You can also import the layer ARN using `!ImportValue SharpHEICLayerArn`.
 - Remove sharp from the dependencies in the function code (it will otherwise conflict with the one provided through the layer)
+- When encoding HEIC (`heif({ compression: 'hevc' })`), pass `tune: 'ssim'` or `tune: 'psnr'`. sharp's default `tune: 'auto'` is rejected by the x265 encoder with `heif: Invalid parameter value (5.2006)`, see [lovell/sharp#4621](https://github.com/lovell/sharp/issues/4621). AVIF (`compression: 'av1'`) is not affected.
 - See [example template](examples/sam-template.yaml) for a complete sample template.
 
 ### Environment Variables for build
@@ -59,7 +60,7 @@ The environment variables are used to create a `samconfig.toml` file that config
 Previously, some custom docker images were needed to build this layer. AWS now publishes managed SAM build images for current Lambda runtimes, including `public.ecr.aws/sam/build-nodejs24.x`.
 
 ### Testing
-The [Test layer](.github/workflows/test-layer.yml) workflow builds the layer with `sam build --use-container` and mounts the result at `/opt` in the `public.ecr.aws/lambda/nodejs:24` runtime image. There it runs [test/layer.test.js](test/layer.test.js), which checks shared library resolution, the libvips and sharp versions, HEIC decoding, WebP resizing, and HEIF encoding with both HEVC and AV1. Pixel colours are verified against [test/fixtures/quadrants.heic](test/fixtures/quadrants.heic), a synthetic image encoded with macOS `sips` (regenerate with `node test/fixtures/make-quadrants-heic.js`). It also invokes the [example function](examples/src/index.js) through the Lambda Runtime Interface Emulator.
+The [Test layer](.github/workflows/test-layer.yml) workflow builds the layer with `sam build --use-container` and mounts the result at `/opt` in the `public.ecr.aws/lambda/nodejs:24` runtime image. There it runs [test/layer.test.js](test/layer.test.js), which checks shared library resolution, the libvips and sharp versions, HEIC decoding, WebP resizing, and HEIF encoding with both HEVC and AV1. Pixel colours are verified against [test/fixtures/quadrants.heic](test/fixtures/quadrants.heic), a synthetic image encoded with macOS `sips` (regenerate with `node test/fixtures/make-quadrants-heic.js`). The layer is only rebuilt when `layer/`, `test/`, `examples/src/`, `template.yaml` or the workflow itself change; for other changes (e.g. documentation) the build job is skipped. It also invokes the [example function](examples/src/index.js) through the Lambda Runtime Interface Emulator.
 
 ## Background
 This repo exists as it is rather painful to compile all libraries required to get sharp to work with HEIC/HEIF files in an AWS Lambda environment. The sharp repository has several [issues](https://github.com/lovell/sharp/issues) related to this.