Merge pull request #1768 from jasongin/readonly-cache

Bump @actions/cache to v6.1.0 - handle read-only cache access

.licenses/npm/@actions/cache.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/cache"
-version: 5.0.5
+version: 6.1.0
 type: npm
 summary: Actions cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/cache

.licenses/npm/@actions/core.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/core"
-version: 2.0.3
+version: 3.0.1
 type: npm
 summary: Actions core lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/core

.licenses/npm/@actions/exec.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/exec"
-version: 2.0.0
+version: 3.0.0
 type: npm
 summary: Actions exec lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/exec

.licenses/npm/@actions/glob.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/glob"
-version: 0.5.1
+version: 0.6.1
 type: npm
 summary: Actions glob lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/glob

.licenses/npm/@actions/http-client.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/http-client"
-version: 3.0.2
+version: 4.0.1
 type: npm
 summary: Actions Http Client
 homepage: https://github.com/actions/toolkit/tree/main/packages/http-client

.licenses/npm/@actions/io.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/io"
-version: 2.0.0
+version: 3.0.2
 type: npm
 summary: Actions io lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/io

.licenses/npm/@azure/core-client.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@azure/core-client"
-version: 1.10.1
+version: 1.10.2
 type: npm
 summary: Core library for interfacing with AutoRest generated code
 homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-client/

.licenses/npm/@azure/core-http-compat.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@azure/core-http-compat"
-version: 2.3.1
+version: 2.4.0
 type: npm
 summary: Core HTTP Compatibility Library to bridge the gap between Core V1 & V2 packages.
 homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-compat/

.licenses/npm/@azure/core-rest-pipeline.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@azure/core-rest-pipeline"
-version: 1.22.2
+version: 1.24.0
 type: npm
 summary: Isomorphic client library for making HTTP requests in node.js and browser.
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-rest-pipeline/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/core-rest-pipeline/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@azure/core-xml.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@azure/core-xml"
-version: 1.5.0
+version: 1.5.1
 type: npm
 summary: Core library for interacting with XML payloads
 homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/core-xml/

.licenses/npm/@azure/storage-blob.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@azure/storage-blob"
-version: 12.30.0
+version: 12.32.0
 type: npm
 summary: Microsoft Azure Storage SDK for JavaScript - Blob
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/storage/storage-blob/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/storage/storage-blob/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@azure/storage-common.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@azure/storage-common"
-version: 12.2.0
+version: 12.4.0
 type: npm
 summary: Azure Storage Common Client Library for JavaScript
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/storage/storage-internal-avro/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/storage/storage-common/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/@nodable/entities.dep.yml

@@ -0,0 +1,11 @@
+---
+name: "@nodable/entities"
+version: 2.2.0
+type: npm
+summary: Entity parser for XML, HTML, External entites with security and NCR control
+homepage: 
+license: mit
+licenses:
+- sources: README.md
+  text: MIT
+notices: []

.licenses/npm/@typespec/ts-http-runtime.dep.yml

@@ -1,9 +1,9 @@
 ---
 name: "@typespec/ts-http-runtime"
-version: 0.3.5
+version: 0.3.6
 type: npm
 summary: Isomorphic client library for making HTTP requests in node.js and browser.
-homepage: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/core/ts-http-runtime/
+homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/ts-http-runtime/README.md
 license: mit
 licenses:
 - sources: LICENSE

.licenses/npm/anynum.dep.yml

@@ -1,16 +1,17 @@
 ---
-name: "@azure/abort-controller"
-version: 1.1.0
+name: anynum
+version: 1.0.1
 type: npm
-summary: Microsoft Azure SDK for JavaScript - Aborter
-homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/abort-controller/README.md
+summary: Normalize all Unicode decimal digits (Devanagari, Arabic, Thai, etc.) to
+  ASCII numerals. Zero dependencies, performance-first.
+homepage: 
 license: mit
 licenses:
 - sources: LICENSE
   text: |
-    The MIT License (MIT)
+    MIT License
 
-    Copyright (c) 2020 Microsoft
+    Copyright (c) 2026 Natural Intelligence
 
     Permission is hereby granted, free of charge, to any person obtaining a copy
     of this software and associated documentation files (the "Software"), to deal
@@ -29,4 +30,6 @@ licenses:
     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE.
+- sources: README.md
+  text: MIT
 notices: []

.licenses/npm/fast-xml-builder.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: fast-xml-builder
-version: 1.1.4
+version: 1.2.0
 type: npm
 summary: Build XML from JSON without C/C++ based libraries
 homepage: 

.licenses/npm/fast-xml-parser.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: fast-xml-parser
-version: 5.5.6
+version: 5.9.2
 type: npm
 summary: Validate XML, Parse XML, Build XML without C/C++ based libraries
 homepage: 

.licenses/npm/is-unsafe.dep.yml

@@ -0,0 +1,35 @@
+---
+name: is-unsafe
+version: 1.0.1
+type: npm
+summary: Zero-dependency, DOM-free, pure predicate for detecting unsafe strings across
+  HTML, XML, SVG, SQL, SHELL, and REGEX contexts
+homepage: 
+license: mit
+licenses:
+- sources: LICENSE
+  text: |
+    MIT License
+
+    Copyright (c) 2026 Natural Intelligence
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+- sources: README.md
+  text: MIT
+notices: []

.licenses/npm/path-expression-matcher.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: path-expression-matcher
-version: 1.1.3
+version: 1.5.0
 type: npm
 summary: Efficient path tracking and pattern matching for XML/JSON parsers
 homepage: https://github.com/NaturalIntelligence/path-expression-matcher#readme

.licenses/npm/semver.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: semver
-version: 6.3.1
+version: 7.8.5
 type: npm
 summary: The semantic version parser used by npm.
 homepage: 

.licenses/npm/strnum.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: strnum
-version: 2.1.2
+version: 2.4.1
 type: npm
 summary: Parse String to Number based on configuration
 homepage: 

.licenses/npm/undici.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: undici
-version: 6.24.1
+version: 6.27.0
 type: npm
 summary: An HTTP/1.1 client, written from scratch for Node.js
 homepage: https://undici.nodejs.org

.licenses/npm/xml-naming.dep.yml

@@ -0,0 +1,12 @@
+---
+name: xml-naming
+version: 0.1.0
+type: npm
+summary: Validates XML name productions — Name, NCName, QName, NMToken, NMTokens —
+  for XML 1.0 and 1.1
+homepage: 
+license: mit
+licenses:
+- sources: README.md
+  text: MIT
+notices: []

README.md

@@ -18,7 +18,7 @@ See ["Caching dependencies to speed up workflows"](https://docs.github.com/en/ac
 ### ⚠️ Important changes
 
 > [!IMPORTANT]
-> `actions/cache@v6` runs on the Node.js 24 runtime and requires a minimum Actions Runner version of `2.327.1`.
+> `actions/cache@v5` runs on the Node.js 24 runtime and requires a minimum Actions Runner version of `2.327.1`.
 > If you are using self-hosted runners, ensure they are updated before upgrading.
 
 The cache backend service has been rewritten from the ground up for improved performance and reliability. [actions/cache](https://github.com/actions/cache) now integrates with the new cache service (v2) APIs.
@@ -83,7 +83,7 @@ Create a workflow `.yml` file in your repository's `.github/workflows` directory
 
 If you are using this inside a container, a POSIX-compliant `tar` needs to be included and accessible from the execution path.
 
-Note: `actions/cache@v6` runs on Node.js 24 and requires a minimum Actions Runner version of `2.327.1`.
+Note: `actions/cache@v5` runs on Node.js 24 and requires a minimum Actions Runner version of `2.327.1`.
 
 If you are using a `self-hosted` Windows runner, `GNU tar` and `zstd` are required for [Cross-OS caching](https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cross-os-cache) to work. They are also recommended to be installed in general so the performance is on par with `hosted` Windows runners.
 
@@ -114,6 +114,14 @@ The cache is scoped to the key, [version](#cache-version), and branch. The defau
 
 See [Matching a cache key](https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows#matching-a-cache-key) for more info.
 
+### Read-only access
+
+Some workflow runs only have read-only access to the cache. A common case is a workflow triggered by a pull request from a fork: such runs can **restore** existing caches but may not be permitted to **save** new ones.
+
+When the cache token is read-only, the save step does not fail the job. Instead, `@actions/cache` reports the denial once as a warning (for example, `Failed to save: ... cache write denied: ...`) and the step completes successfully without writing a cache entry. Restores in the same run continue to work as usual.
+
+> **Note** This applies to the action's normal save path as well as the standalone [Save action](./save/README.md). If you intentionally want a restore-only setup, see [Make cache read only / Reuse cache from centralized job](./caching-strategies.md#make-cache-read-only--reuse-cache-from-centralized-job).
+
 ### Example cache workflow
 
 #### Restoring and saving cache using a single action

RELEASES.md

@@ -25,6 +25,11 @@
 
 ## Changelog
 
+### 6.1.0
+
+- Bump `@actions/cache` to v6.1.0 to pick up [actions/toolkit#2435 Handle cache write error due to read-only token](https://github.com/actions/toolkit/pull/2435)
+- Switch redundant "Cache save failed" warning to debug log in save-only
+
 ### 6.0.0
 
 - Updated `@actions/cache` to ^6.0.1, `@actions/core` to ^3.0.1, `@actions/exec` to ^3.0.0, `@actions/io` to ^3.0.2

__tests__/actionUtils.test.ts

@@ -50,7 +50,7 @@ let pristineEnv: NodeJS.ProcessEnv;
 beforeEach(() => {
     pristineEnv = { ...process.env };
     jest.clearAllMocks();
-    (core.getInput as jest.Mock).mockImplementation(
+    jest.mocked(core.getInput).mockImplementation(
         (name: string, options?: { required?: boolean }) => {
             const val =
                 process.env[`INPUT_${name.replace(/ /g, "_").toUpperCase()}`] ||
@@ -217,12 +217,12 @@ test("getInputAsBool throws if required and value missing", () => {
 });
 
 test("isCacheFeatureAvailable for ac enabled", () => {
-    (cache.isFeatureAvailable as jest.Mock).mockReturnValue(true);
+    jest.mocked(cache.isFeatureAvailable).mockReturnValue(true);
     expect(actionUtils.isCacheFeatureAvailable()).toBe(true);
 });
 
 test("isCacheFeatureAvailable for ac disabled on GHES", () => {
-    (cache.isFeatureAvailable as jest.Mock).mockReturnValue(false);
+    jest.mocked(cache.isFeatureAvailable).mockReturnValue(false);
 
     const message = `Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.
 Otherwise please upgrade to GHES version >= 3.5 and If you are also using Github Connect, please unretire the actions/cache namespace before upgrade (see https://docs.github.com/en/enterprise-server@3.5/admin/github-actions/managing-access-to-actions-from-githubcom/enabling-automatic-access-to-githubcom-actions-using-github-connect#automatic-retirement-of-namespaces-for-actions-accessed-on-githubcom)`;
@@ -237,7 +237,7 @@ Otherwise please upgrade to GHES version >= 3.5 and If you are also using Github
 });
 
 test("isCacheFeatureAvailable for ac disabled on dotcom", () => {
-    (cache.isFeatureAvailable as jest.Mock).mockReturnValue(false);
+    jest.mocked(cache.isFeatureAvailable).mockReturnValue(false);
 
     const message =
         "An internal error has occurred in cache backend. Please check https://www.githubstatus.com/ for any ongoing issue in actions.";

__tests__/restoreImpl.test.ts

@@ -48,7 +48,7 @@ const testUtils = await import("../src/utils/testUtils");
 
 beforeEach(() => {
     jest.clearAllMocks();
-    (core.getInput as jest.Mock).mockImplementation(
+    jest.mocked(core.getInput).mockImplementation(
         (name: string, options?: { required?: boolean }) => {
             const val =
                 process.env[`INPUT_${name.replace(/ /g, "_").toUpperCase()}`] ||
@@ -59,8 +59,8 @@ beforeEach(() => {
             return val.trim();
         }
     );
-    (core.getState as jest.Mock).mockReturnValue("");
-    (cache.isFeatureAvailable as jest.Mock).mockReturnValue(true);
+    jest.mocked(core.getState).mockReturnValue("");
+    jest.mocked(cache.isFeatureAvailable).mockReturnValue(true);
     process.env[Events.Key] = Events.Push;
     process.env[RefKey] = "refs/heads/feature-branch";
 });
@@ -83,7 +83,7 @@ test("restore with invalid event outputs warning", async () => {
 });
 
 test("restore without AC available should no-op", async () => {
-    (cache.isFeatureAvailable as jest.Mock).mockReturnValue(false);
+    jest.mocked(cache.isFeatureAvailable).mockReturnValue(false);
 
     await restoreImpl(new StateProvider());
 
@@ -93,13 +93,21 @@ test("restore without AC available should no-op", async () => {
 });
 
 test("restore on GHES without AC available should no-op", async () => {
-    (cache.isFeatureAvailable as jest.Mock).mockReturnValue(false);
+    process.env["GITHUB_SERVER_URL"] = "https://my-ghes-server.com";
+    jest.mocked(cache.isFeatureAvailable).mockReturnValue(false);
 
     await restoreImpl(new StateProvider());
 
     expect(cache.restoreCache).toHaveBeenCalledTimes(0);
     expect(core.setOutput).toHaveBeenCalledTimes(1);
     expect(core.setOutput).toHaveBeenCalledWith("cache-hit", "false");
+    expect(core.info).toHaveBeenCalledWith(
+        expect.stringContaining(
+            "Cache action is only supported on GHES version >= 3.5"
+        )
+    );
+
+    delete process.env["GITHUB_SERVER_URL"];
 });
 
 test("restore on GHES with AC available ", async () => {
@@ -111,7 +119,7 @@ test("restore on GHES with AC available ", async () => {
         enableCrossOsArchive: false
     });
 
-    (cache.restoreCache as jest.Mock).mockResolvedValue(key);
+    jest.mocked(cache.restoreCache).mockResolvedValue(key);
 
     await restoreImpl(new StateProvider());
 
@@ -160,7 +168,7 @@ test("restore with too many keys should fail", async () => {
         restoreKeys,
         enableCrossOsArchive: false
     });
-    (cache.restoreCache as jest.Mock).mockRejectedValue(
+    jest.mocked(cache.restoreCache).mockRejectedValue(
         new Error("Key Validation Error: Keys are limited to a maximum of 10.")
     );
     await restoreImpl(new StateProvider());
@@ -178,7 +186,7 @@ test("restore with large key should fail", async () => {
         key,
         enableCrossOsArchive: false
     });
-    (cache.restoreCache as jest.Mock).mockRejectedValue(
+    jest.mocked(cache.restoreCache).mockRejectedValue(
         new Error(
             `Key Validation Error: ${key} cannot be larger than 512 characters.`
         )
@@ -198,7 +206,7 @@ test("restore with invalid key should fail", async () => {
         key,
         enableCrossOsArchive: false
     });
-    (cache.restoreCache as jest.Mock).mockRejectedValue(
+    jest.mocked(cache.restoreCache).mockRejectedValue(
         new Error(`Key Validation Error: ${key} cannot contain commas.`)
     );
     await restoreImpl(new StateProvider());
@@ -217,7 +225,7 @@ test("restore with no cache found", async () => {
         enableCrossOsArchive: false
     });
 
-    (cache.restoreCache as jest.Mock).mockResolvedValue(undefined);
+    jest.mocked(cache.restoreCache).mockResolvedValue(undefined);
 
     await restoreImpl(new StateProvider());
 
@@ -240,7 +248,7 @@ test("restore with restore keys and no cache found", async () => {
         enableCrossOsArchive: false
     });
 
-    (cache.restoreCache as jest.Mock).mockResolvedValue(undefined);
+    jest.mocked(cache.restoreCache).mockResolvedValue(undefined);
 
     await restoreImpl(new StateProvider());
 
@@ -261,7 +269,7 @@ test("restore with cache found for key", async () => {
         enableCrossOsArchive: false
     });
 
-    (cache.restoreCache as jest.Mock).mockResolvedValue(key);
+    jest.mocked(cache.restoreCache).mockResolvedValue(key);
 
     await restoreImpl(new StateProvider());
 
@@ -284,7 +292,7 @@ test("restore with cache found for restore key", async () => {
         enableCrossOsArchive: false
     });
 
-    (cache.restoreCache as jest.Mock).mockResolvedValue(restoreKey);
+    jest.mocked(cache.restoreCache).mockResolvedValue(restoreKey);
 
     await restoreImpl(new StateProvider());
 
@@ -307,7 +315,7 @@ test("restore with lookup-only set", async () => {
         lookupOnly: true
     });
 
-    (cache.restoreCache as jest.Mock).mockResolvedValue(key);
+    jest.mocked(cache.restoreCache).mockResolvedValue(key);
 
     await restoreImpl(new StateProvider());
 

__tests__/saveImpl.test.ts

@@ -101,11 +101,19 @@ test("save without AC available should no-op", async () => {
 });
 
 test("save on ghes without AC available should no-op", async () => {
+    process.env["GITHUB_SERVER_URL"] = "https://my-ghes-server.com";
     (cache.isFeatureAvailable as jest.Mock).mockReturnValue(false);
 
     await saveImpl(new StateProvider());
 
     expect(cache.saveCache).toHaveBeenCalledTimes(0);
+    expect(core.info).toHaveBeenCalledWith(
+        expect.stringContaining(
+            "Cache action is only supported on GHES version >= 3.5"
+        )
+    );
+
+    delete process.env["GITHUB_SERVER_URL"];
 });
 
 test("save on GHES with AC available", async () => {
@@ -159,8 +167,8 @@ test("save with missing input outputs warning", async () => {
     const savedCacheKey = "Linux-node-";
 
     (core.getState as jest.Mock)
-        .mockReturnValueOnce(savedCacheKey)
-        .mockReturnValueOnce(primaryKey);
+        .mockReturnValueOnce(primaryKey)
+        .mockReturnValueOnce(savedCacheKey);
 
     await saveImpl(new StateProvider());
 
@@ -176,8 +184,8 @@ test("save with large cache outputs warning", async () => {
     const savedCacheKey = "Linux-node-";
 
     (core.getState as jest.Mock)
-        .mockReturnValueOnce(savedCacheKey)
-        .mockReturnValueOnce(primaryKey);
+        .mockReturnValueOnce(primaryKey)
+        .mockReturnValueOnce(savedCacheKey);
 
     const inputPath = "node_modules";
     testUtils.setInput(Inputs.Path, inputPath);
@@ -202,8 +210,8 @@ test("save with reserve cache failure outputs warning", async () => {
     const savedCacheKey = "Linux-node-";
 
     (core.getState as jest.Mock)
-        .mockReturnValueOnce(savedCacheKey)
-        .mockReturnValueOnce(primaryKey);
+        .mockReturnValueOnce(primaryKey)
+        .mockReturnValueOnce(savedCacheKey);
 
     const inputPath = "node_modules";
     testUtils.setInput(Inputs.Path, inputPath);
@@ -228,8 +236,8 @@ test("save with server error outputs warning", async () => {
     const savedCacheKey = "Linux-node-";
 
     (core.getState as jest.Mock)
-        .mockReturnValueOnce(savedCacheKey)
-        .mockReturnValueOnce(primaryKey);
+        .mockReturnValueOnce(primaryKey)
+        .mockReturnValueOnce(savedCacheKey);
 
     const inputPath = "node_modules";
     testUtils.setInput(Inputs.Path, inputPath);

__tests__/saveOnly.test.ts

@@ -95,7 +95,11 @@ test("save with valid inputs uploads a cache", async () => {
     expect(core.setFailed).toHaveBeenCalledTimes(0);
 });
 
-test("save failing logs the warning message", async () => {
+test("save failing logs the debug message", async () => {
+    const debugMock = jest.spyOn(core, "debug");
+    const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
+
     const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
 
     const inputPath = "node_modules";
@@ -103,6 +107,9 @@ test("save failing logs the warning message", async () => {
     testUtils.setInput(Inputs.Path, inputPath);
     testUtils.setInput(Inputs.UploadChunkSize, "4000000");
 
+    // A read-only / write-denied save surfaces to the action as saveCache resolving
+    // to -1; the toolkit has already logged the underlying reason. The action
+    // must not fail the job or emit its own warning.
     const cacheId = -1;
     (cache.saveCache as jest.Mock).mockResolvedValue(cacheId);
 
@@ -118,6 +125,7 @@ test("save failing logs the warning message", async () => {
         false
     );
 
-    expect(core.warning).toHaveBeenCalledTimes(1);
-    expect(core.warning).toHaveBeenCalledWith("Cache save failed.");
+    expect(debugMock).toHaveBeenCalledWith("Cache was not saved.");
+    expect(warningMock).not.toHaveBeenCalled();
+    expect(failedMock).not.toHaveBeenCalled();
 });

dist/restore-only/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

dist/restore/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

dist/save-only/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

dist/save/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

jest.config.ts

@@ -1,12 +1,12 @@
 export default {
     clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
-  roots: ['<rootDir>/__tests__'],
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
+    moduleFileExtensions: ["js", "ts"],
+    roots: ["<rootDir>/__tests__"],
+    testEnvironment: "node",
+    testMatch: ["**/*.test.ts"],
     transform: {
-    '^.+\\.ts$': [
-      'ts-jest',
+        "^.+\\.ts$": [
+            "ts-jest",
             {
                 useESM: true,
                 diagnostics: {
@@ -15,7 +15,7 @@ export default {
             }
         ]
     },
-  extensionsToTreatAsEsm: ['.ts'],
-  transformIgnorePatterns: ['node_modules/(?!(@actions)/)'],
+    extensionsToTreatAsEsm: [".ts"],
+    transformIgnorePatterns: ["node_modules/(?!(@actions)/)"],
     verbose: true
-}
+};

package-lock.json

@@ -1,15 +1,15 @@
 {
   "name": "cache",
-  "version": "6.0.0",
+  "version": "6.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
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+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.9.2.tgz",
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       "funding": [
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           "type": "github",
@@ -4325,10 +4421,11 @@
       ],
       "license": "MIT",
       "dependencies": {
-        "@nodable/entities": "^2.1.0",
+        "@nodable/entities": "^2.2.0",
         "fast-xml-builder": "^1.2.0",
+        "is-unsafe": "^1.0.1",
         "path-expression-matcher": "^1.5.0",
-        "strnum": "^2.3.0",
+        "strnum": "^2.4.0",
         "xml-naming": "^0.1.0"
       },
       "bin": {
@@ -5401,6 +5498,18 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/is-unsafe": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-unsafe/-/is-unsafe-1.0.1.tgz",
+      "integrity": "sha512-CLK2+VdgERgD96EYm5lUQssZYlRg2tkZnbsxZoacmSiRxiFJ4Nk4SzjCl+Ur+v3kXIY9dTIdb3IH22y1mZ56LA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/is-weakmap": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/is-weakmap/-/is-weakmap-2.0.2.tgz",
@@ -5489,9 +5598,9 @@
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-      "version": "7.8.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.0.tgz",
-      "integrity": "sha512-AcM7dV/5ul4EekoQ29Agm5vri8JNqRyj39o0qpX6vDF2GZrtutZl5RwgD1XnZjiTAfncsJhMI48QQH3sN87YNA==",
+      "version": "7.8.5",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
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       "dev": true,
       "license": "ISC",
       "bin": {
@@ -5720,9 +5829,9 @@
       }
     },
     "node_modules/jest-config/node_modules/brace-expansion": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.0.tgz",
-      "integrity": "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.1.tgz",
+      "integrity": "sha512-WR1cURNjuvBLMZBMbqM0UoE+WAfdUcEV1ccD8PVBVOI+Z3ND4+SZbN8RsfT2bMuG1qwz5RFvPukSZm5fF2D5eA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6081,9 +6190,9 @@
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     },
     "node_modules/jest-runtime/node_modules/brace-expansion": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.0.tgz",
-      "integrity": "sha512-TN1kCZAgdgweJhWWpgKYrQaMNHcDULHkWwQIspdtjV4Y5aurRdZpjAqn6yX3FPqTA9ngHCc4hJxMAMgGfve85w==",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.1.tgz",
+      "integrity": "sha512-WR1cURNjuvBLMZBMbqM0UoE+WAfdUcEV1ccD8PVBVOI+Z3ND4+SZbN8RsfT2bMuG1qwz5RFvPukSZm5fF2D5eA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6162,9 +6271,9 @@
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     },
     "node_modules/jest-snapshot/node_modules/semver": {
-      "version": "7.8.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.0.tgz",
-      "integrity": "sha512-AcM7dV/5ul4EekoQ29Agm5vri8JNqRyj39o0qpX6vDF2GZrtutZl5RwgD1XnZjiTAfncsJhMI48QQH3sN87YNA==",
+      "version": "7.8.5",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
+      "integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
       "dev": true,
       "license": "ISC",
       "bin": {
@@ -6468,9 +6577,9 @@
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     },
     "node_modules/make-dir/node_modules/semver": {
-      "version": "7.8.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.0.tgz",
-      "integrity": "sha512-AcM7dV/5ul4EekoQ29Agm5vri8JNqRyj39o0qpX6vDF2GZrtutZl5RwgD1XnZjiTAfncsJhMI48QQH3sN87YNA==",
+      "version": "7.8.5",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
+      "integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
       "dev": true,
       "license": "ISC",
       "bin": {
@@ -7239,9 +7348,9 @@
     },
     "node_modules/react-is-19": {
       "name": "react-is",
-      "version": "19.2.6",
-      "resolved": "https://registry.npmjs.org/react-is/-/react-is-19.2.6.tgz",
-      "integrity": "sha512-XjBR15BhXuylgWGuslhDKqlSayuqvqBX91BP8pauG8kd1zY8kotkNWbXksTCNRarse4kuGbe2kIY05ARtwNIvw==",
+      "version": "19.2.7",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-19.2.7.tgz",
+      "integrity": "sha512-kZFnouyVv7eP/Phmrlo9FK+zcAdriZJvzxXHF1Sl1P377WSGe2G/JxVolhTrB/jeV47lKImhNUsijjHAAbcl/A==",
       "dev": true,
       "license": "MIT"
     },
@@ -7865,16 +7974,19 @@
       }
     },
     "node_modules/strnum": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.3.0.tgz",
-      "integrity": "sha512-ums3KNd42PGyx5xaoVTO1mjU1bH3NpY4vsrVlnv9PNGqQj8wd7rJ6nEypLrJ7z5vxK5RP0yMLo6J/Gsm62DI5Q==",
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.4.1.tgz",
+      "integrity": "sha512-M9eUSMT2dCB2cTNPG7UYj6KuK7RJR2SN2+yCV/fTW3xzTCS6EaGZ5pSMgDIjB7r8zSfTGk+dvvn9rTjpVS9Mwg==",
       "funding": [
         {
           "type": "github",
           "url": "https://github.com/sponsors/NaturalIntelligence"
         }
       ],
-      "license": "MIT"
+      "license": "MIT",
+      "dependencies": {
+        "anynum": "^1.0.1"
+      }
     },
     "node_modules/supports-color": {
       "version": "7.2.0",
@@ -8332,9 +8444,9 @@
       }
     },
     "node_modules/undici": {
-      "version": "6.25.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-6.25.0.tgz",
-      "integrity": "sha512-ZgpWDC5gmNiuY9CnLVXEH8rl50xhRCuLNA97fAUnKi8RRuV4E6KG31pDTsLVUKnohJE0I3XDrTeEydAXRw47xg==",
+      "version": "6.27.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.27.0.tgz",
+      "integrity": "sha512-YmfV3YnEDzXRC5lZ2jWtWWHKGUm1zIt8AhesR1tens+HTNv+YZlN/dp6G727LOvMJ8xjP9Be7Y2Sdr96LDm+pg==",
       "license": "MIT",
       "engines": {
         "node": ">=18.17"
@@ -8684,9 +8796,9 @@
       "license": "ISC"
     },
     "node_modules/yargs": {
-      "version": "17.7.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
-      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "version": "17.7.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.3.tgz",
+      "integrity": "sha512-GZtjxm/J/4TSxuL3FNYjCmLktBTnIw/rVmKSIyKeYAZpmJB2ig9VauCC5xsa82GNKVKDAqpOn3KVzNt0zmrU0g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {

package.json

@@ -1,13 +1,13 @@
 {
   "name": "cache",
-  "version": "6.0.0",
+  "version": "6.1.0",
   "private": true,
   "description": "Cache dependencies and build outputs",
   "type": "module",
   "main": "dist/restore/index.js",
   "scripts": {
     "build": "tsc && ncc build -o dist/restore src/restore.ts && ncc build -o dist/save src/save.ts && ncc build -o dist/restore-only src/restoreOnly.ts && ncc build -o dist/save-only src/saveOnly.ts",
-    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js --coverage",
+    "test": "tsc --noEmit && node --experimental-vm-modules node_modules/jest/bin/jest.js --coverage",
     "lint": "eslint **/*.ts --cache",
     "format": "prettier --write **/*.ts",
     "format-check": "prettier --check **/*.ts"
@@ -24,7 +24,7 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^6.0.1",
+    "@actions/cache": "^6.1.0",
     "@actions/core": "^3.0.1",
     "@actions/exec": "^3.0.0",
     "@actions/io": "^3.0.2"

src/saveImpl.ts

@@ -84,7 +84,11 @@ export async function saveOnlyRun(
     try {
         const cacheId = await saveImpl(new NullStateProvider());
         if (cacheId === -1) {
-            core.warning(`Cache save failed.`);
+            // The toolkit's saveCache already logs the underlying reason at
+            // the appropriate severity (warning for most failures, info for
+            // benign concurrency races, error for 5xx). Avoid emitting a
+            // generic warning here that would duplicate or mask that signal.
+            core.debug(`Cache was not saved.`);
         }
     } catch (err) {
         console.error(err);