Update some packages (#366)

* Update some packages

* Run `make-everything-from-scratch`

* Update `@types/node`

.github/dependabot.yml

@@ -5,15 +5,30 @@ updates:
   schedule:
     interval: monthly
   open-pull-requests-limit: 99
+  groups:
+    # Group all Git submodules PRs into a single PR:
+    all-gitsubmodule-actions:
+      patterns:
+        - "*"
 
 - package-ecosystem: 'github-actions'
   directory: '/'
   schedule:
     interval: 'monthly'
   open-pull-requests-limit: 99
+  groups:
+    # Group all GitHub Actions PRs into a single PR:
+    all-github-actions:
+      patterns:
+        - "*"
     
 - package-ecosystem: npm
   directory: "/"
   schedule:
     interval: monthly
   open-pull-requests-limit: 99
+  groups:
+    # Group all NPM PRs into a single PR:
+    all-npm-actions:
+      patterns:
+        - "*"

.github/workflows/codeql-analysis.yml

@@ -42,11 +42,11 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6.0.1
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v3
+      uses: github/codeql-action/init@v4
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -57,7 +57,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v3
+      uses: github/codeql-action/autobuild@v4
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -71,4 +71,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v3
+      uses: github/codeql-action/analyze@v4

.github/workflows/example-builds-defaultarch.yml

@@ -23,9 +23,9 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6.0.1
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
           node-version-file: '.tool-versions'

.github/workflows/example-builds-nightly-defaultarch.yml

@@ -18,20 +18,18 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: [nightly, 1.10-nightly]
+        julia-version: [nightly, 1.13-nightly]
         os:
           - ubuntu-latest
           - windows-latest
-          # - macos-11 # Intel
+          - macos-15-intel # Intel
-          - macos-12 # Intel
-          - macos-13 # Intel
           - macos-14 # Apple Silicon
-          - macos-latest # Currently Intel, but will probably point to Apple Silicon in the future
+          - macos-latest # Apple Silicon
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6.0.1
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
           node-version-file: '.tool-versions'

.github/workflows/example-builds-nightly.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: [nightly, 1.10-nightly]
+        julia-version: [nightly, 1.13-nightly]
         julia-arch: [x64, x86]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         # 32-bit Julia binaries are not available on macOS
@@ -29,9 +29,9 @@ jobs:
             julia-arch: x86
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6.0.1
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
           node-version-file: '.tool-versions'

.github/workflows/example-builds.yml

@@ -27,11 +27,18 @@ jobs:
         exclude:
           - os: macOS-latest
             julia-arch: x86
+        include:
+          - os: macOS-latest
+            julia-arch: aarch64
+            julia-version: 'lts'
+          - os: macOS-latest
+            julia-arch: aarch64
+            julia-version: '1'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6.0.1
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         if: ${{ ! startsWith(github.ref, 'refs/heads/releases') }}
         with:
           node-version-file: '.tool-versions'

.github/workflows/pr_checks.yml

@@ -39,21 +39,21 @@ jobs:
       fail-fast: false
     steps:
       ### Check out the repo:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false
       ### Cleanall:
       - run: make cleanall
       ### Install NodeJS
       # Unix (non-Windows):
-      - uses: asdf-vm/actions/setup@05e0d2ed97b598bfce82fd30daf324ae0c4570e6
+      - uses: asdf-vm/actions/setup@b7bcd026f18772e44fe1026d729e1611cc435d47
         if: runner.os != 'Windows'
       - run: make unix-asdf-install
         if: runner.os != 'Windows'
       # Windows:
         # Windows does not support asdf, so we have to use `actions/setup-node`
         # to install asdf:
-      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b
+      - uses: actions/setup-node@dda4788290998366da86b6a4f497909644397bb2
         if: runner.os == 'Windows'
         with:
           node-version-file: '.tool-versions'
@@ -71,7 +71,7 @@ jobs:
       ### Clean (not cleanall!):
       - run: make clean
       ### Make sure there are no uncommited changes
-      - uses: julia-actions/setup-julia@780022b48dfc0c2c6b94cfee6a9284850107d037
+      - uses: julia-actions/setup-julia@5c9647d97b78a5debe5164e9eec09d653d29bd71 # v2.6.1
         with:
           version: '1'
       - run: git --no-pager status
@@ -82,21 +82,21 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       ### Check out the repo:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false
       ### Cleanall:
       - run: make cleanall
       ### Install NodeJS
       # Unix (non-Windows):
-      - uses: asdf-vm/actions/setup@05e0d2ed97b598bfce82fd30daf324ae0c4570e6
+      - uses: asdf-vm/actions/setup@b7bcd026f18772e44fe1026d729e1611cc435d47
         if: runner.os != 'Windows'
       - run: make unix-asdf-install
         if: runner.os != 'Windows'
       # Windows:
         # Windows does not support asdf, so we have to use `actions/setup-node`
         # to install asdf:
-      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b
+      - uses: actions/setup-node@dda4788290998366da86b6a4f497909644397bb2
         if: runner.os == 'Windows'
         with:
           node-version-file: '.tool-versions'
@@ -126,21 +126,21 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       ### Check out the repo:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false
       ### Cleanall:
       - run: make cleanall
       ### Install NodeJS
       # Unix (non-Windows):
-      - uses: asdf-vm/actions/setup@05e0d2ed97b598bfce82fd30daf324ae0c4570e6
+      - uses: asdf-vm/actions/setup@b7bcd026f18772e44fe1026d729e1611cc435d47
         if: runner.os != 'Windows'
       - run: make unix-asdf-install
         if: runner.os != 'Windows'
       # Windows:
         # Windows does not support asdf, so we have to use `actions/setup-node`
         # to install asdf:
-      - uses: actions/setup-node@1e60f620b9541d16bece96c5465dc8ee9832be0b
+      - uses: actions/setup-node@dda4788290998366da86b6a4f497909644397bb2
         if: runner.os == 'Windows'
         with:
           node-version-file: '.tool-versions'
@@ -161,14 +161,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       ### Check out the repo:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false
       ### Cleanall:
       - run: make cleanall
       ### Install NodeJS
       # Unix (non-Windows):
-      - uses: asdf-vm/actions/setup@05e0d2ed97b598bfce82fd30daf324ae0c4570e6
+      - uses: asdf-vm/actions/setup@b7bcd026f18772e44fe1026d729e1611cc435d47
         if: runner.os != 'Windows'
       - run: make unix-asdf-install
         if: runner.os != 'Windows'
@@ -199,12 +199,12 @@ jobs:
       fail-fast: false
     steps:
       ### Check out the repo:
-      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false
       ### Install NodeJS
       # Unix (non-Windows):
-      - uses: asdf-vm/actions/setup@05e0d2ed97b598bfce82fd30daf324ae0c4570e6
+      - uses: asdf-vm/actions/setup@b7bcd026f18772e44fe1026d729e1611cc435d47
         if: runner.os != 'Windows'
       - run: make unix-asdf-install
         if: runner.os != 'Windows'
@@ -214,7 +214,7 @@ jobs:
       # - run: npm install --package-lock-only
       - run: npm install
       ### Make sure there are no uncommited changes
-      - uses: julia-actions/setup-julia@780022b48dfc0c2c6b94cfee6a9284850107d037
+      - uses: julia-actions/setup-julia@5c9647d97b78a5debe5164e9eec09d653d29bd71 # v2.6.1
         with:
           version: '1'
       - run: git --no-pager status

README.md

@@ -41,7 +41,7 @@ This action sets up a Julia environment for use in actions by downloading a spec
     #          For example, `1.10` may be parsed as `1.1`.
     #
     # Default: '1'
-    version: ''
+    version: '1'
 
     # The architecture of the Julia binaries.
     #
@@ -53,8 +53,8 @@ This action sets up a Julia environment for use in actions by downloading a spec
     #
     # Note: you can use X64, X86, and ARM64 as synonyms for x64, x86, and aarch64, respectively.
     #
-    # Defaults to the architecture of the runner executing the job.
+    # Specifying 'default' uses the architecture of the runner executing the job.
-    arch: ''
+    arch: 'default'
 
     # Set the display setting for printing InteractiveUtils.versioninfo() after installing.
     #
@@ -70,12 +70,12 @@ This action sets up a Julia environment for use in actions by downloading a spec
     # never: Never print versioninfo
     #
     # Default: false
-    show-versioninfo: ''
+    show-versioninfo: 'false'
 
     # Set the path to the project directory or file to use when resolving some versions (e.g. `min`).
     #
     # Defaults to using JULIA_PROJECT if defined, otherwise '.'
-    project: ''
+    project: ${{ env.JULIA_PROJECT }} or '.' (if JULIA_PROJECT is unset)
 ```
 
 ### Outputs
@@ -122,6 +122,7 @@ You can either specify specific Julia versions or version ranges. If you specify
 - `'~1.3.0-rc1'` is a **tilde** version range that includes pre-releases of `1.3.0` starting at `rc1`. It matches all versions `≥ 1.3.0-rc1` and `< 1.4.0`.
 - `'^1.3.0-0'` is a **caret** version range that includes _all_ pre-releases of `1.3.0`. It matches all versions `≥ 1.3.0-` and `< 2.0.0`.
 - `'~1.3.0-0'` is a **tilde** version range that includes _all_ pre-releases of `1.3.0`. It matches all versions `≥ 1.3.0-` and `< 1.4.0`.
+- `'1'` will install the latest v1 version of Julia.
 - `'lts'` will install the latest LTS build.
 - `'pre'` will install the latest prerelease build (RCs, betas, and alphas).
 - `'nightly'` will install the latest nightly build.
@@ -193,12 +194,18 @@ jobs:
     strategy:
       matrix:
         julia-version: ['1.0', '1.2.0', '^1.3.0-rc1']
-        julia-arch: [x64, x86]
+        julia-arch: [x64, x86, aarch64]
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        # 32-bit Julia binaries are not available on macOS
+        # exclude unavailable/unwanted architectures
         exclude:
           - os: macOS-latest
             julia-arch: x86
+          - os: macOS-latest
+            julia-arch: x64 # can be run but via rosetta on apple silicon runners
+          - os: ubuntu-latest
+            julia-arch: aarch64
+          - os: windows-latest
+            julia-arch: aarch64
 
     steps:
       - uses: actions/checkout@v4

__tests__/installer.test.ts

@@ -26,8 +26,8 @@ const testVersions = [
     '1.7.0', '1.7.0-beta1', '1.7.0-beta2', '1.7.0-beta3', '1.7.0-beta4', '1.7.0-rc1', '1.7.0-rc2', '1.7.0-rc3', '1.7.1', '1.7.2', '1.7.3',
     '1.8.0', '1.8.0-beta1', '1.8.0-beta2', '1.8.0-beta3', '1.8.0-rc1', '1.8.0-rc2', '1.8.0-rc3', '1.8.0-rc4', '1.8.1', '1.8.2', '1.8.3', '1.8.4', '1.8.5',
     '1.9.0', '1.9.0-alpha1', '1.9.0-beta1', '1.9.0-beta2', '1.9.0-beta3', '1.9.0-beta4', '1.9.0-rc1', '1.9.0-rc2', '1.9.0-rc3', '1.9.1', '1.9.2', '1.9.3', '1.9.4',
-    '1.10.0', '1.10.0-alpha1', '1.10.0-beta1', '1.10.0-beta2', '1.10.0-beta3', '1.10.0-rc1', '1.10.0-rc2', '1.10.0-rc3', '1.10.1', '1.10.2',
+    '1.10.0', '1.10.0-alpha1', '1.10.0-beta1', '1.10.0-beta2', '1.10.0-beta3', '1.10.0-rc1', '1.10.0-rc2', '1.10.0-rc3', '1.10.1', '1.10.2', '1.10.3', '1.10.4', '1.10.5',
-    '1.11.0-alpha1', '1.11.0-alpha2', '1.11.0-beta1'
+    '1.11.0', '1.11.0-alpha1', '1.11.0-alpha2', '1.11.0-beta1', '1.11.0-beta2', '1.11.0-rc1', '1.11.0-rc2', '1.11.0-rc3', '1.11.0-rc4',
 ]
 
 const toolDir = path.join(__dirname, 'runner', 'tools')
@@ -187,30 +187,30 @@ describe('version matching tests', () => {
 
         it('LTS', () => {
             // Update test when LTS is updated
-            expect(installer.getJuliaVersion(testVersions, 'lts')).toEqual(installer.getJuliaVersion(testVersions, '1.6'))
+            expect(installer.getJuliaVersion(testVersions, 'lts')).toEqual(installer.getJuliaVersion(testVersions, '1.10'))
-            expect(installer.getJuliaVersion(testVersions, 'lts')).toEqual('1.6.7')
+            expect(installer.getJuliaVersion(testVersions, 'lts')).toEqual('1.10.5')
         })
 
         it('pre', () => {
-            expect(installer.getJuliaVersion(testVersions, 'pre')).toEqual('1.11.0-beta1')
+            expect(installer.getJuliaVersion(testVersions, 'pre')).toEqual('1.11.0')
         })
     })
 
     describe('version ranges', () => {
         it('Chooses the highest available version that matches the input', () => {
-            expect(installer.getJuliaVersion(testVersions, '1')).toEqual('1.10.2')
+            expect(installer.getJuliaVersion(testVersions, '1')).toEqual('1.11.0')
             expect(installer.getJuliaVersion(testVersions, '1.0')).toEqual('1.0.5')
-            expect(installer.getJuliaVersion(testVersions, '^1.3.0-rc1')).toEqual('1.10.2')
+            expect(installer.getJuliaVersion(testVersions, '^1.3.0-rc1')).toEqual('1.11.0')
-            expect(installer.getJuliaVersion(testVersions, '^1.2.0-rc1')).toEqual('1.10.2')
+            expect(installer.getJuliaVersion(testVersions, '^1.2.0-rc1')).toEqual('1.11.0')
-            expect(installer.getJuliaVersion(testVersions, '^1.10.0-rc1')).toEqual('1.10.2')
+            expect(installer.getJuliaVersion(testVersions, '^1.10.0-rc1')).toEqual('1.11.0')
         })
     })
 
     describe('include-prereleases', () => {
         it('Chooses the highest available version that matches the input including prereleases', () => {
-            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', true)).toEqual('1.11.0-beta1')
+            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', true)).toEqual('1.11.0')
-            expect(installer.getJuliaVersion(testVersions, '1', true)).toEqual('1.11.0-beta1')
+            expect(installer.getJuliaVersion(testVersions, '1', true)).toEqual('1.11.0')
-            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', false)).toEqual('1.10.2')
+            expect(installer.getJuliaVersion(testVersions, '^1.2.0-0', false)).toEqual('1.11.0')
         })
     })
 

lib/installer.js

@@ -15,13 +15,23 @@ var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (
 }) : function(o, v) {
     o["default"] = v;
 });
-var __importStar = (this && this.__importStar) || function (mod) {
+var __importStar = (this && this.__importStar) || (function () {
-    if (mod && mod.__esModule) return mod;
+    var ownKeys = function(o) {
-    var result = {};
+        ownKeys = Object.getOwnPropertyNames || function (o) {
-    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+            var ar = [];
-    __setModuleDefault(result, mod);
+            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
-    return result;
+            return ar;
-};
+        };
+        return ownKeys(o);
+    };
+    return function (mod) {
+        if (mod && mod.__esModule) return mod;
+        var result = {};
+        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
+        __setModuleDefault(result, mod);
+        return result;
+    };
+})();
 var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
     function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
     return new (P || (P = Promise))(function (resolve, reject) {
@@ -52,7 +62,7 @@ const path = __importStar(require("path"));
 const retry = require("async-retry");
 const semver = __importStar(require("semver"));
 const toml = __importStar(require("toml"));
-const LTS_VERSION = '1.6';
+const LTS_VERSION = '1.10';
 const MAJOR_VERSION = '1'; // Could be deduced from versions.json
 // Translations between actions input and Julia arch names
 const osMap = {

lib/setup-julia.js

@@ -15,13 +15,23 @@ var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (
 }) : function(o, v) {
     o["default"] = v;
 });
-var __importStar = (this && this.__importStar) || function (mod) {
+var __importStar = (this && this.__importStar) || (function () {
-    if (mod && mod.__esModule) return mod;
+    var ownKeys = function(o) {
-    var result = {};
+        ownKeys = Object.getOwnPropertyNames || function (o) {
-    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+            var ar = [];
-    __setModuleDefault(result, mod);
+            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
-    return result;
+            return ar;
-};
+        };
+        return ownKeys(o);
+    };
+    return function (mod) {
+        if (mod && mod.__esModule) return mod;
+        var result = {};
+        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
+        __setModuleDefault(result, mod);
+        return result;
+    };
+})();
 var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
     function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
     return new (P || (P = Promise))(function (resolve, reject) {
@@ -46,6 +56,7 @@ const installer = __importStar(require("./installer"));
 const archSynonyms = {
     'x86': 'x86',
     'x64': 'x64',
+    'x86_64': 'x64',
     'aarch64': 'aarch64',
     'arm64': 'aarch64'
 };
@@ -87,6 +98,9 @@ function run() {
             if (!originalArchInput) { // if `originalArchInput` is an empty string
                 throw new Error(`Arch input must not be null`);
             }
+            if (originalArchInput == 'x64' && os.platform() == 'darwin' && os.arch() == 'arm64') {
+                core.warning('[setup-julia] x64 arch has been requested on a macOS runner that has an arm64 (Apple Silicon) architecture. You may have meant to use the "aarch64" arch instead (or left it unspecified for the correct default).');
+            }
             let processedArchInput;
             if (originalArchInput == "default") {
                 // If the user sets the `arch` input to `default`, then we use the

package.json

@@ -20,26 +20,26 @@
   "author": "Sascha Mann <git@mail.saschamann.eu>",
   "license": "MIT",
   "dependencies": {
-    "@actions/core": "^1.10.1",
+    "@actions/core": "^1.11.1",
     "@actions/exec": "^1.1.1",
     "@actions/io": "^1.1.3",
-    "@actions/tool-cache": "^2.0.1",
+    "@actions/tool-cache": "^2.0.2",
     "async-retry": "^1.3.3",
-    "semver": "^7.6.3",
+    "semver": "^7.7.0",
     "toml": "^3.0.0"
   },
   "devDependencies": {
-    "@types/async-retry": "^1.4.8",
+    "@types/async-retry": "^1.4.9",
-    "@types/jest": "^29.5.12",
+    "@types/jest": "^30.0.0",
-    "@types/node": "^22.5.1",
+    "@types/node": "^25.2.0",
     "@types/retry": "^0.12.5",
-    "@types/semver": "^7.5.8",
+    "@types/semver": "^7.7.0",
-    "@vercel/ncc": "^0.38.1",
+    "@vercel/ncc": "^0.38.3",
-    "jest": "^29.7.0",
+    "jest": "^30.0.5",
-    "jest-circus": "^29.7.0",
+    "jest-circus": "^30.0.3",
-    "nock": "^13.5.4",
+    "nock": "^14.0.8",
-    "prettier": "^3.3.3",
+    "prettier": "^3.6.2",
-    "ts-jest": "^29.2.5",
+    "ts-jest": "^29.4.0",
-    "typescript": "^5.5.4"
+    "typescript": "^5.9.2"
   }
 }

src/installer.ts

@@ -11,7 +11,7 @@ import retry = require('async-retry')
 import * as semver from 'semver'
 import * as toml from 'toml'
 
-const LTS_VERSION = '1.6'
+const LTS_VERSION = '1.10'
 const MAJOR_VERSION = '1' // Could be deduced from versions.json
 
 // Translations between actions input and Julia arch names

src/setup-julia.ts

@@ -15,6 +15,7 @@ import * as installer from './installer'
 const archSynonyms = {
     'x86': 'x86',
     'x64': 'x64',
+    'x86_64': 'x64',
     'aarch64': 'aarch64',
     'arm64': 'aarch64'
 }
@@ -61,6 +62,10 @@ async function run() {
             throw new Error(`Arch input must not be null`)
         }
 
+        if (originalArchInput == 'x64' && os.platform() == 'darwin' && os.arch() == 'arm64') {
+            core.warning('[setup-julia] x64 arch has been requested on a macOS runner that has an arm64 (Apple Silicon) architecture. You may have meant to use the "aarch64" arch instead (or left it unspecified for the correct default).')
+        }
+
         let processedArchInput: string;
         if (originalArchInput == "default") {
             // If the user sets the `arch` input to `default`, then we use the