diff --git a/dist/index.js b/dist/index.js
index 9d171f0d..1fccfef3 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -126811,111 +126811,45 @@ var lib_github = __nccwpck_require__(84005);
 var date_fns = __nccwpck_require__(61223);
 // EXTERNAL MODULE: ../../node_modules/yaml/dist/index.js
 var dist = __nccwpck_require__(8447);
-;// CONCATENATED MODULE: external "node:fs"
-const external_node_fs_namespaceObject = __WEBPACK_EXTERNAL_createRequire(import.meta.url)("node:fs");
-;// CONCATENATED MODULE: ./src/system.ts
+;// CONCATENATED MODULE: ./src/constants.ts
 
 
 
 
-function getArchitecture() {
+const ARCHITECTURE = (() => {
     switch (external_node_os_namespaceObject.arch()) {
         case "x64": {
-            return Architecture.X86_64;
+            return "x86_64";
         }
         case "arm64": {
-            return Architecture.ARM;
+            return "arm64";
         }
         default: {
             throw new Error("The architecture is not supported.");
         }
     }
-}
-function getPlatform() {
+})();
+const PLATFORM = (() => {
     switch (external_node_os_namespaceObject.platform()) {
         case "linux": {
-            return Platform.Linux;
+            return "linux";
         }
         case "darwin": {
-            return Platform.MacOS;
+            return "macos";
         }
         case "win32": {
-            return Platform.Win32;
+            return "win32";
         }
         default: {
             throw new Error("The platform is not supported.");
         }
     }
-}
-async function getSystemIdentificationInfo() {
-    const platform = getPlatform();
-    if (platform === Platform.Linux) {
-        const osRelease = await external_node_fs_namespaceObject.promises.readFile("/etc/os-release", "utf8");
-        const lines = osRelease.split(external_node_os_namespaceObject.EOL);
-        let id = "";
-        let version = "";
-        for (const line of lines) {
-            const [key, value] = line.split("=").map((kv) => kv.trim());
-            if (key === "ID" && value !== undefined) {
-                id = value.toLowerCase();
-            }
-            else if (key === "VERSION_ID" && value !== undefined) {
-                version = value.toLowerCase().replaceAll('"', "");
-            }
-        }
-        return { id, version };
-    }
-    else if (platform === Platform.MacOS) {
-        const swVers = await (0,lib_exec.getExecOutput)("sw_vers");
-        const lines = swVers.stdout.split(external_node_os_namespaceObject.EOL);
-        let version = "";
-        for (const line of lines) {
-            const [key, value] = line.split(":").map((kv) => kv.trim());
-            if (key === "ProductVersion" && value !== undefined) {
-                version = value;
-            }
-        }
-        return { id: "macos", version };
-    }
-    else {
-        throw new Error("The system is not supported.");
-    }
-}
-async function updateUnixPackageIndexFiles() {
-    const isGitHubRunner = process.env["ImageOS"] !== undefined;
-    const platform = getPlatform();
-    if (isGitHubRunner) {
-        if (platform === Platform.Linux) {
-            await (0,lib_exec.exec)("sudo", ["apt-get", "update"]);
-        }
-        else if (platform === Platform.MacOS) {
-            await (0,lib_exec.exec)("brew", ["update"]);
-        }
-    }
-}
-
-;// CONCATENATED MODULE: ./src/constants.ts
-
-
-
-
-var Architecture;
-(function (Architecture) {
-    Architecture["X86_64"] = "x86_64";
-    Architecture["ARM"] = "arm64";
-})(Architecture || (Architecture = {}));
-var Platform;
-(function (Platform) {
-    Platform["Linux"] = "linux";
-    Platform["MacOS"] = "macos";
-    Platform["Win32"] = "win32";
-})(Platform || (Platform = {}));
-const platform = getPlatform();
+})();
 const CYGWIN_ROOT = external_node_path_namespaceObject.join("D:", "cygwin");
 const CYGWIN_ROOT_BIN = external_node_path_namespaceObject.join(CYGWIN_ROOT, "bin");
 const CYGWIN_ROOT_WRAPPERBIN = external_node_path_namespaceObject.join(CYGWIN_ROOT, "wrapperbin");
 // [todo] remove the branch for Windows once opam 2.2 is released as stable.
-const ALLOW_PRELEASE_OPAM = platform !== Platform.Win32 &&
+const ALLOW_PRELEASE_OPAM = PLATFORM !== "win32" &&
     lib_core.getBooleanInput("allow-prelease-opam", {
         required: false,
         trimWhitespace: true,
@@ -126956,19 +126890,71 @@ const OPAM_PIN = lib_core.getBooleanInput("opam-pin", {
     trimWhitespace: true,
 });
 const repositories_yaml = dist/* parse */.Qc(lib_core.getInput("opam-repositories", { required: false, trimWhitespace: true }));
-const defaultRepository = platform === Platform.Win32
+const defaultRepository = PLATFORM === "win32"
     ? "https://github.com/ocaml-opam/opam-repository-mingw.git#sunset"
     : "https://github.com/ocaml/opam-repository.git";
 const OPAM_REPOSITORIES = repositories_yaml
     ? Object.entries(repositories_yaml).reverse()
     : [["default", defaultRepository]];
 
+;// CONCATENATED MODULE: external "node:fs"
+const external_node_fs_namespaceObject = __WEBPACK_EXTERNAL_createRequire(import.meta.url)("node:fs");
 // EXTERNAL MODULE: ../../node_modules/@actions/io/lib/io.js
 var io = __nccwpck_require__(96890);
 // EXTERNAL MODULE: ../../node_modules/@actions/tool-cache/lib/tool-cache.js
 var tool_cache = __nccwpck_require__(40834);
 // EXTERNAL MODULE: ../../node_modules/semver/index.js
 var semver = __nccwpck_require__(77546);
+;// CONCATENATED MODULE: ./src/system.ts
+
+
+
+
+async function getSystemIdentificationInfo() {
+    if (PLATFORM === "linux") {
+        const osRelease = await external_node_fs_namespaceObject.promises.readFile("/etc/os-release", "utf8");
+        const lines = osRelease.split(external_node_os_namespaceObject.EOL);
+        let id = "";
+        let version = "";
+        for (const line of lines) {
+            const [key, value] = line.split("=").map((kv) => kv.trim());
+            if (key === "ID" && value !== undefined) {
+                id = value.toLowerCase();
+            }
+            else if (key === "VERSION_ID" && value !== undefined) {
+                version = value.toLowerCase().replaceAll('"', "");
+            }
+        }
+        return { id, version };
+    }
+    else if (PLATFORM === "macos") {
+        const swVers = await (0,lib_exec.getExecOutput)("sw_vers");
+        const lines = swVers.stdout.split(external_node_os_namespaceObject.EOL);
+        let version = "";
+        for (const line of lines) {
+            const [key, value] = line.split(":").map((kv) => kv.trim());
+            if (key === "ProductVersion" && value !== undefined) {
+                version = value;
+            }
+        }
+        return { id: "macos", version };
+    }
+    else {
+        throw new Error("The system is not supported.");
+    }
+}
+async function updateUnixPackageIndexFiles() {
+    const isGitHubRunner = process.env["ImageOS"] !== undefined;
+    if (isGitHubRunner) {
+        if (PLATFORM === "linux") {
+            await (0,lib_exec.exec)("sudo", ["apt-get", "update"]);
+        }
+        else if (PLATFORM === "macos") {
+            await (0,lib_exec.exec)("brew", ["update"]);
+        }
+    }
+}
+
 // EXTERNAL MODULE: ../../node_modules/@actions/http-client/lib/index.js
 var lib = __nccwpck_require__(87301);
 ;// CONCATENATED MODULE: ../../node_modules/cheerio/lib/esm/options.js
@@ -144303,9 +144289,7 @@ async function getLatestOpamRelease() {
     if (!latestRelease) {
         throw new Error("Could not retrieve the opam release matching the version constraint");
     }
-    const architecture = getArchitecture();
-    const platform = getPlatform();
-    const matchedAssets = latestRelease.assets.find((asset) => asset.browser_download_url.includes(`${architecture}-${platform}`));
+    const matchedAssets = latestRelease.assets.find((asset) => asset.browser_download_url.includes(`${ARCHITECTURE}-${PLATFORM}`));
     if (!matchedAssets) {
         throw new Error("Could not find any assets matching the current platform or architecture");
     }
@@ -144315,8 +144299,7 @@ async function getLatestOpamRelease() {
     };
 }
 async function findOpam() {
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const opamPath = external_node_path_namespaceObject.join(CYGWIN_ROOT, "bin", "opam.exe");
         return opamPath;
     }
@@ -144327,12 +144310,11 @@ async function findOpam() {
 }
 async function acquireOpamUnix() {
     const { version, browserDownloadUrl } = await getLatestOpamRelease();
-    const architecture = getArchitecture();
-    const cachedPath = tool_cache.find("opam", version, architecture);
+    const cachedPath = tool_cache.find("opam", version, ARCHITECTURE);
     if (cachedPath === "") {
         const downloadedPath = await tool_cache.downloadTool(browserDownloadUrl);
         lib_core.info(`Acquired ${version} from ${browserDownloadUrl}`);
-        const cachedPath = await tool_cache.cacheFile(downloadedPath, "opam", "opam", version, architecture);
+        const cachedPath = await tool_cache.cacheFile(downloadedPath, "opam", "opam", version, ARCHITECTURE);
         lib_core.info(`Successfully cached opam to ${cachedPath}`);
         await external_node_fs_namespaceObject.promises.chmod(`${cachedPath}/opam`, 0o755);
         lib_core.addPath(cachedPath);
@@ -144345,9 +144327,8 @@ async function acquireOpamUnix() {
 }
 async function installUnixSystemPackages() {
     const isGitHubRunner = external_node_process_namespaceObject.env.ImageOS !== undefined;
-    const platform = getPlatform();
     if (isGitHubRunner) {
-        if (platform === Platform.Linux) {
+        if (PLATFORM === "linux") {
             const { version: systemVersion } = await getSystemIdentificationInfo();
             if (systemVersion === "18.04") {
                 // [info]: musl-tools bug in ubuntu 18.04;
@@ -144367,7 +144348,7 @@ async function installUnixSystemPackages() {
                 "rsync",
             ]);
         }
-        else if (platform === Platform.MacOS) {
+        else if (PLATFORM === "macos") {
             await (0,lib_exec.exec)("brew", ["install", "darcs", "gpatch", "mercurial"]);
         }
     }
@@ -144501,8 +144482,7 @@ async function setupOpamWindows() {
     external_node_process_namespaceObject.env.PATH = originalPath.join(external_node_path_namespaceObject.delimiter);
 }
 async function setupOpam() {
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         await setupOpamWindows();
     }
     else {
@@ -144511,8 +144491,7 @@ async function setupOpam() {
 }
 async function installOcaml(ocamlCompiler) {
     await lib_core.group("Install OCaml", async () => {
-        const platform = getPlatform();
-        if (platform === Platform.Win32) {
+        if (PLATFORM === "win32") {
             // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
             const originalPath = external_node_process_namespaceObject.env.PATH.split(external_node_path_namespaceObject.delimiter);
             const patchedPath = [CYGWIN_ROOT_BIN, ...originalPath];
@@ -144564,12 +144543,11 @@ async function repositoryAdd(name, address) {
 }
 async function repositoryAddAll(repositories) {
     await lib_core.group("Initialise the opam repositories", async () => {
-        const platform = getPlatform();
         let restore_autocrlf;
         // Works around the lack of https://github.com/ocaml/opam/pull/3882 when
         // adding ocaml/opam-repository on Windows. Can be removed when the action
         // switches to opam 2.2
-        if (platform === Platform.Win32) {
+        if (PLATFORM === "win32") {
             const autocrlf = await (0,lib_exec.getExecOutput)("git", ["config", "--global", "core.autocrlf"], { ignoreReturnCode: true });
             if (autocrlf.stdout.trim() !== "input") {
                 if (autocrlf.exitCode === 0) {
@@ -144629,7 +144607,6 @@ async function repositoryRemoveAll() {
 
 
 
-
 function isSemverValidRange(semverVersion) {
     const isValidSemver = semver.validRange(semverVersion, { loose: true }) !== null;
     // [NOTE] explicitly deny compilers like "4.14.0+mingw64c" as invalid semver
@@ -144639,10 +144616,9 @@ function isSemverValidRange(semverVersion) {
 }
 async function getAllCompilerVersions() {
     const octokit = lib_github.getOctokit(constants_GITHUB_TOKEN);
-    const platform = getPlatform();
-    const owner = platform === Platform.Win32 ? "ocaml-opam" : "ocaml";
-    const repo = platform === Platform.Win32 ? "opam-repository-mingw" : "opam-repository";
-    const prefix = platform === Platform.Win32 ? "ocaml-variants" : "ocaml-base-compiler";
+    const owner = PLATFORM === "win32" ? "ocaml-opam" : "ocaml";
+    const repo = PLATFORM === "win32" ? "opam-repository-mingw" : "opam-repository";
+    const prefix = PLATFORM === "win32" ? "ocaml-variants" : "ocaml-base-compiler";
     const { data: packages } = await octokit.rest.repos.getContent({
         owner,
         repo,
@@ -144675,9 +144651,8 @@ async function resolveVersion(semverVersion) {
     }
 }
 async function resolveCompiler(compiler) {
-    const platform = getPlatform();
     const resolvedCompiler = isSemverValidRange(compiler)
-        ? platform === Platform.Win32
+        ? PLATFORM === "win32"
             ? `ocaml-variants.${await resolveVersion(compiler)}+mingw64c`
             : `ocaml-base-compiler.${await resolveVersion(compiler)}`
         : compiler;
@@ -144720,8 +144695,8 @@ async function composeCygwinCacheKeys() {
     return { key, restoreKeys };
 }
 function composeDuneCacheKeys() {
-    const platform = getPlatform().replaceAll(/\W/g, "_");
-    const architecture = getArchitecture().replaceAll(/\W/g, "_");
+    const platform = PLATFORM.replaceAll(/\W/g, "_");
+    const architecture = ARCHITECTURE.replaceAll(/\W/g, "_");
     const { workflow: _workflow, job: _job, runId, runNumber } = lib_github.context;
     const workflow = _workflow.toLowerCase().replaceAll(/\W/g, "_");
     const job = _job.replaceAll(/\W/g, "_");
@@ -144735,13 +144710,11 @@ function composeDuneCacheKeys() {
     return { key, restoreKeys };
 }
 async function composeOpamCacheKeys() {
-    const platform = getPlatform();
-    const fullPlatform = platform === Platform.Win32
-        ? platform
+    const fullPlatform = PLATFORM === "win32"
+        ? PLATFORM
         : // eslint-disable-next-line unicorn/no-await-expression-member
-            `${platform}-${(await getSystemIdentificationInfo()).version}`;
-    const architecture = getArchitecture();
-    const opamVersion = platform === Platform.Win32
+            `${PLATFORM}-${(await getSystemIdentificationInfo()).version}`;
+    const opamVersion = PLATFORM === "win32"
         ? "0.0.0.2"
         : // eslint-disable-next-line unicorn/no-await-expression-member
             (await getLatestOpamRelease()).version;
@@ -144749,11 +144722,11 @@ async function composeOpamCacheKeys() {
     const ocamlVersion = ocamlCompiler.toLowerCase().replaceAll(/\W/g, "_");
     const sandboxed = OPAM_DISABLE_SANDBOXING ? "nosandbox" : "sandbox";
     const { year, week } = composeDate();
-    const key = `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-${week}`;
+    const key = `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-${week}`;
     const restoreKeys = [
-        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-${week}`,
-        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-`,
-        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-`,
+        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-${week}`,
+        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-`,
+        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-`,
     ];
     return { key, restoreKeys };
 }
@@ -144795,8 +144768,7 @@ function composeCygwinCachePaths() {
 function composeDuneCachePaths() {
     const paths = [];
     const homeDir = external_node_os_namespaceObject.homedir();
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const duneCacheDir = external_node_path_namespaceObject.join(homeDir, "Local Settings", "Cache", "dune");
         paths.push(duneCacheDir);
     }
@@ -144811,8 +144783,7 @@ function composeDuneCachePaths() {
 }
 function composeOpamCachePaths() {
     const paths = [];
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const opamRootCachePath = external_node_path_namespaceObject.join("D:", ".opam");
         paths.push(opamRootCachePath);
         const { repo: { repo }, } = lib_github.context;
@@ -144831,8 +144802,7 @@ function composeOpamCachePaths() {
 }
 function composeOpamDownloadCachePaths() {
     const paths = [];
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const opamDownloadCachePath = external_node_path_namespaceObject.join("D:", ".opam", "download-cache");
         paths.push(opamDownloadCachePath);
     }
@@ -144943,13 +144913,11 @@ async function saveOpamDownloadCache() {
 
 
 
-
 async function installDepext(ocamlVersion) {
     await lib_core.group("Install depext", async () => {
-        const platform = getPlatform();
-        const depextCygwinports = platform === Platform.Win32 ? ["depext-cygwinports"] : [];
+        const depextCygwinports = PLATFORM === "win32" ? ["depext-cygwinports"] : [];
         await (0,lib_exec.exec)("opam", ["install", "opam-depext", ...depextCygwinports]);
-        if (platform === Platform.Win32) {
+        if (PLATFORM === "win32") {
             let base = "";
             if (ocamlVersion.includes("mingw64")) {
                 base = "x86_64-w64-mingw32";
@@ -145026,7 +144994,6 @@ async function getOpamLocalPackages() {
 
 
 async function installer() {
-    const platform = getPlatform();
     if (!ALLOW_PRELEASE_OPAM) {
         // [todo] remove this once opam 2.2 is released as stable.
         // https://github.com/ocaml/setup-ocaml/issues/299
@@ -145040,11 +145007,11 @@ async function installer() {
     // https://github.com/ocaml/opam/issues/3447
     lib_core.exportVariable("OPAMSOLVERTIMEOUT", 1000);
     lib_core.exportVariable("OPAMYES", 1);
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const opamRoot = external_node_path_namespaceObject.join("D:", ".opam");
         lib_core.exportVariable("OPAMROOT", opamRoot);
     }
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         await lib_core.group("Change the file system behavior parameters", async () => {
             await (0,lib_exec.exec)("fsutil", ["behavior", "query", "SymlinkEvaluation"]);
             // https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-behavior
@@ -145058,25 +145025,25 @@ async function installer() {
             await (0,lib_exec.exec)("fsutil", ["behavior", "query", "SymlinkEvaluation"]);
         });
     }
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         lib_core.exportVariable("HOME", external_node_process_namespaceObject.env.USERPROFILE);
         lib_core.exportVariable("MSYS", "winsymlinks:native");
     }
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         await restoreCygwinCache();
     }
     const opamCacheHit = await restoreOpamCache();
     await setupOpam();
     await repositoryRemoveAll();
     await repositoryAddAll(OPAM_REPOSITORIES);
+    const ocamlCompiler = await resolveCompiler(OCAML_COMPILER);
     if (!opamCacheHit) {
-        const ocamlCompiler = await resolveCompiler(OCAML_COMPILER);
         await installOcaml(ocamlCompiler);
         await saveOpamCache();
     }
     await restoreOpamDownloadCache();
     if (OPAM_DEPEXT) {
-        await installDepext(platform);
+        await installDepext(ocamlCompiler);
     }
     if (DUNE_CACHE) {
         await restoreDuneCache();
diff --git a/dist/post/index.js b/dist/post/index.js
index 8ce4247e..bb2d7400 100644
--- a/dist/post/index.js
+++ b/dist/post/index.js
@@ -125629,111 +125629,45 @@ var lib_github = __nccwpck_require__(84005);
 var date_fns = __nccwpck_require__(61223);
 // EXTERNAL MODULE: ../../node_modules/yaml/dist/index.js
 var dist = __nccwpck_require__(8447);
-;// CONCATENATED MODULE: external "node:fs"
-const external_node_fs_namespaceObject = __WEBPACK_EXTERNAL_createRequire(import.meta.url)("node:fs");
-;// CONCATENATED MODULE: ./src/system.ts
+;// CONCATENATED MODULE: ./src/constants.ts
 
 
 
 
-function system_getArchitecture() {
+const constants_ARCHITECTURE = (() => {
     switch (external_node_os_namespaceObject.arch()) {
         case "x64": {
-            return Architecture.X86_64;
+            return "x86_64";
         }
         case "arm64": {
-            return Architecture.ARM;
+            return "arm64";
         }
         default: {
             throw new Error("The architecture is not supported.");
         }
     }
-}
-function system_getPlatform() {
+})();
+const constants_PLATFORM = (() => {
     switch (external_node_os_namespaceObject.platform()) {
         case "linux": {
-            return constants_Platform.Linux;
+            return "linux";
         }
         case "darwin": {
-            return constants_Platform.MacOS;
+            return "macos";
         }
         case "win32": {
-            return constants_Platform.Win32;
+            return "win32";
         }
         default: {
             throw new Error("The platform is not supported.");
         }
     }
-}
-async function system_getSystemIdentificationInfo() {
-    const platform = system_getPlatform();
-    if (platform === Platform.Linux) {
-        const osRelease = await fs.readFile("/etc/os-release", "utf8");
-        const lines = osRelease.split(os.EOL);
-        let id = "";
-        let version = "";
-        for (const line of lines) {
-            const [key, value] = line.split("=").map((kv) => kv.trim());
-            if (key === "ID" && value !== undefined) {
-                id = value.toLowerCase();
-            }
-            else if (key === "VERSION_ID" && value !== undefined) {
-                version = value.toLowerCase().replaceAll('"', "");
-            }
-        }
-        return { id, version };
-    }
-    else if (platform === Platform.MacOS) {
-        const swVers = await getExecOutput("sw_vers");
-        const lines = swVers.stdout.split(os.EOL);
-        let version = "";
-        for (const line of lines) {
-            const [key, value] = line.split(":").map((kv) => kv.trim());
-            if (key === "ProductVersion" && value !== undefined) {
-                version = value;
-            }
-        }
-        return { id: "macos", version };
-    }
-    else {
-        throw new Error("The system is not supported.");
-    }
-}
-async function system_updateUnixPackageIndexFiles() {
-    const isGitHubRunner = process.env["ImageOS"] !== undefined;
-    const platform = system_getPlatform();
-    if (isGitHubRunner) {
-        if (platform === Platform.Linux) {
-            await exec("sudo", ["apt-get", "update"]);
-        }
-        else if (platform === Platform.MacOS) {
-            await exec("brew", ["update"]);
-        }
-    }
-}
-
-;// CONCATENATED MODULE: ./src/constants.ts
-
-
-
-
-var Architecture;
-(function (Architecture) {
-    Architecture["X86_64"] = "x86_64";
-    Architecture["ARM"] = "arm64";
-})(Architecture || (Architecture = {}));
-var constants_Platform;
-(function (Platform) {
-    Platform["Linux"] = "linux";
-    Platform["MacOS"] = "macos";
-    Platform["Win32"] = "win32";
-})(constants_Platform || (constants_Platform = {}));
-const platform = system_getPlatform();
+})();
 const constants_CYGWIN_ROOT = external_node_path_namespaceObject.join("D:", "cygwin");
 const constants_CYGWIN_ROOT_BIN = external_node_path_namespaceObject.join(constants_CYGWIN_ROOT, "bin");
 const constants_CYGWIN_ROOT_WRAPPERBIN = external_node_path_namespaceObject.join(constants_CYGWIN_ROOT, "wrapperbin");
 // [todo] remove the branch for Windows once opam 2.2 is released as stable.
-const constants_ALLOW_PRELEASE_OPAM = platform !== constants_Platform.Win32 &&
+const constants_ALLOW_PRELEASE_OPAM = constants_PLATFORM !== "win32" &&
     lib_core.getBooleanInput("allow-prelease-opam", {
         required: false,
         trimWhitespace: true,
@@ -125774,19 +125708,71 @@ const OPAM_PIN = lib_core.getBooleanInput("opam-pin", {
     trimWhitespace: true,
 });
 const repositories_yaml = dist/* parse */.Qc(lib_core.getInput("opam-repositories", { required: false, trimWhitespace: true }));
-const defaultRepository = platform === constants_Platform.Win32
+const defaultRepository = constants_PLATFORM === "win32"
     ? "https://github.com/ocaml-opam/opam-repository-mingw.git#sunset"
     : "https://github.com/ocaml/opam-repository.git";
 const OPAM_REPOSITORIES = repositories_yaml
     ? Object.entries(repositories_yaml).reverse()
     : [["default", defaultRepository]];
 
+;// CONCATENATED MODULE: external "node:fs"
+const external_node_fs_namespaceObject = __WEBPACK_EXTERNAL_createRequire(import.meta.url)("node:fs");
 // EXTERNAL MODULE: ../../node_modules/@actions/io/lib/io.js
 var lib_io = __nccwpck_require__(96890);
 // EXTERNAL MODULE: ../../node_modules/@actions/tool-cache/lib/tool-cache.js
 var tool_cache = __nccwpck_require__(40834);
 // EXTERNAL MODULE: ../../node_modules/semver/index.js
 var node_modules_semver = __nccwpck_require__(77546);
+;// CONCATENATED MODULE: ./src/system.ts
+
+
+
+
+async function system_getSystemIdentificationInfo() {
+    if (PLATFORM === "linux") {
+        const osRelease = await fs.readFile("/etc/os-release", "utf8");
+        const lines = osRelease.split(os.EOL);
+        let id = "";
+        let version = "";
+        for (const line of lines) {
+            const [key, value] = line.split("=").map((kv) => kv.trim());
+            if (key === "ID" && value !== undefined) {
+                id = value.toLowerCase();
+            }
+            else if (key === "VERSION_ID" && value !== undefined) {
+                version = value.toLowerCase().replaceAll('"', "");
+            }
+        }
+        return { id, version };
+    }
+    else if (PLATFORM === "macos") {
+        const swVers = await getExecOutput("sw_vers");
+        const lines = swVers.stdout.split(os.EOL);
+        let version = "";
+        for (const line of lines) {
+            const [key, value] = line.split(":").map((kv) => kv.trim());
+            if (key === "ProductVersion" && value !== undefined) {
+                version = value;
+            }
+        }
+        return { id: "macos", version };
+    }
+    else {
+        throw new Error("The system is not supported.");
+    }
+}
+async function system_updateUnixPackageIndexFiles() {
+    const isGitHubRunner = process.env["ImageOS"] !== undefined;
+    if (isGitHubRunner) {
+        if (PLATFORM === "linux") {
+            await exec("sudo", ["apt-get", "update"]);
+        }
+        else if (PLATFORM === "macos") {
+            await exec("brew", ["update"]);
+        }
+    }
+}
+
 // EXTERNAL MODULE: ../../node_modules/@actions/http-client/lib/index.js
 var lib = __nccwpck_require__(87301);
 ;// CONCATENATED MODULE: ../../node_modules/cheerio/lib/esm/options.js
@@ -143121,9 +143107,7 @@ async function opam_getLatestOpamRelease() {
     if (!latestRelease) {
         throw new Error("Could not retrieve the opam release matching the version constraint");
     }
-    const architecture = getArchitecture();
-    const platform = getPlatform();
-    const matchedAssets = latestRelease.assets.find((asset) => asset.browser_download_url.includes(`${architecture}-${platform}`));
+    const matchedAssets = latestRelease.assets.find((asset) => asset.browser_download_url.includes(`${ARCHITECTURE}-${PLATFORM}`));
     if (!matchedAssets) {
         throw new Error("Could not find any assets matching the current platform or architecture");
     }
@@ -143133,8 +143117,7 @@ async function opam_getLatestOpamRelease() {
     };
 }
 async function findOpam() {
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const opamPath = path.join(CYGWIN_ROOT, "bin", "opam.exe");
         return opamPath;
     }
@@ -143145,12 +143128,11 @@ async function findOpam() {
 }
 async function acquireOpamUnix() {
     const { version, browserDownloadUrl } = await opam_getLatestOpamRelease();
-    const architecture = getArchitecture();
-    const cachedPath = tc.find("opam", version, architecture);
+    const cachedPath = tc.find("opam", version, ARCHITECTURE);
     if (cachedPath === "") {
         const downloadedPath = await tc.downloadTool(browserDownloadUrl);
         core.info(`Acquired ${version} from ${browserDownloadUrl}`);
-        const cachedPath = await tc.cacheFile(downloadedPath, "opam", "opam", version, architecture);
+        const cachedPath = await tc.cacheFile(downloadedPath, "opam", "opam", version, ARCHITECTURE);
         core.info(`Successfully cached opam to ${cachedPath}`);
         await fs.chmod(`${cachedPath}/opam`, 0o755);
         core.addPath(cachedPath);
@@ -143163,9 +143145,8 @@ async function acquireOpamUnix() {
 }
 async function installUnixSystemPackages() {
     const isGitHubRunner = process.env["ImageOS"] !== undefined;
-    const platform = getPlatform();
     if (isGitHubRunner) {
-        if (platform === Platform.Linux) {
+        if (PLATFORM === "linux") {
             const { version: systemVersion } = await getSystemIdentificationInfo();
             if (systemVersion === "18.04") {
                 // [info]: musl-tools bug in ubuntu 18.04;
@@ -143185,7 +143166,7 @@ async function installUnixSystemPackages() {
                 "rsync",
             ]);
         }
-        else if (platform === Platform.MacOS) {
+        else if (PLATFORM === "macos") {
             await exec("brew", ["install", "darcs", "gpatch", "mercurial"]);
         }
     }
@@ -143319,8 +143300,7 @@ async function setupOpamWindows() {
     process.env["PATH"] = originalPath.join(path.delimiter);
 }
 async function setupOpam() {
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         await setupOpamWindows();
     }
     else {
@@ -143329,8 +143309,7 @@ async function setupOpam() {
 }
 async function installOcaml(ocamlCompiler) {
     await core.group("Install OCaml", async () => {
-        const platform = getPlatform();
-        if (platform === Platform.Win32) {
+        if (PLATFORM === "win32") {
             // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
             const originalPath = process.env["PATH"].split(path.delimiter);
             const patchedPath = [CYGWIN_ROOT_BIN, ...originalPath];
@@ -143382,12 +143361,11 @@ async function repositoryAdd(name, address) {
 }
 async function repositoryAddAll(repositories) {
     await core.group("Initialise the opam repositories", async () => {
-        const platform = getPlatform();
         let restore_autocrlf;
         // Works around the lack of https://github.com/ocaml/opam/pull/3882 when
         // adding ocaml/opam-repository on Windows. Can be removed when the action
         // switches to opam 2.2
-        if (platform === Platform.Win32) {
+        if (PLATFORM === "win32") {
             const autocrlf = await getExecOutput("git", ["config", "--global", "core.autocrlf"], { ignoreReturnCode: true });
             if (autocrlf.stdout.trim() !== "input") {
                 if (autocrlf.exitCode === 0) {
@@ -143447,7 +143425,6 @@ async function repositoryRemoveAll() {
 
 
 
-
 function isSemverValidRange(semverVersion) {
     const isValidSemver = semver.validRange(semverVersion, { loose: true }) !== null;
     // [NOTE] explicitly deny compilers like "4.14.0+mingw64c" as invalid semver
@@ -143457,10 +143434,9 @@ function isSemverValidRange(semverVersion) {
 }
 async function getAllCompilerVersions() {
     const octokit = github.getOctokit(GITHUB_TOKEN);
-    const platform = getPlatform();
-    const owner = platform === Platform.Win32 ? "ocaml-opam" : "ocaml";
-    const repo = platform === Platform.Win32 ? "opam-repository-mingw" : "opam-repository";
-    const prefix = platform === Platform.Win32 ? "ocaml-variants" : "ocaml-base-compiler";
+    const owner = PLATFORM === "win32" ? "ocaml-opam" : "ocaml";
+    const repo = PLATFORM === "win32" ? "opam-repository-mingw" : "opam-repository";
+    const prefix = PLATFORM === "win32" ? "ocaml-variants" : "ocaml-base-compiler";
     const { data: packages } = await octokit.rest.repos.getContent({
         owner,
         repo,
@@ -143493,9 +143469,8 @@ async function resolveVersion(semverVersion) {
     }
 }
 async function version_resolveCompiler(compiler) {
-    const platform = getPlatform();
     const resolvedCompiler = isSemverValidRange(compiler)
-        ? platform === Platform.Win32
+        ? PLATFORM === "win32"
             ? `ocaml-variants.${await resolveVersion(compiler)}+mingw64c`
             : `ocaml-base-compiler.${await resolveVersion(compiler)}`
         : compiler;
@@ -143538,8 +143513,8 @@ async function composeCygwinCacheKeys() {
     return { key, restoreKeys };
 }
 function composeDuneCacheKeys() {
-    const platform = system_getPlatform().replaceAll(/\W/g, "_");
-    const architecture = system_getArchitecture().replaceAll(/\W/g, "_");
+    const platform = constants_PLATFORM.replaceAll(/\W/g, "_");
+    const architecture = constants_ARCHITECTURE.replaceAll(/\W/g, "_");
     const { workflow: _workflow, job: _job, runId, runNumber } = lib_github.context;
     const workflow = _workflow.toLowerCase().replaceAll(/\W/g, "_");
     const job = _job.replaceAll(/\W/g, "_");
@@ -143553,13 +143528,11 @@ function composeDuneCacheKeys() {
     return { key, restoreKeys };
 }
 async function composeOpamCacheKeys() {
-    const platform = getPlatform();
-    const fullPlatform = platform === Platform.Win32
-        ? platform
+    const fullPlatform = PLATFORM === "win32"
+        ? PLATFORM
         : // eslint-disable-next-line unicorn/no-await-expression-member
-            `${platform}-${(await getSystemIdentificationInfo()).version}`;
-    const architecture = getArchitecture();
-    const opamVersion = platform === Platform.Win32
+            `${PLATFORM}-${(await getSystemIdentificationInfo()).version}`;
+    const opamVersion = PLATFORM === "win32"
         ? "0.0.0.2"
         : // eslint-disable-next-line unicorn/no-await-expression-member
             (await getLatestOpamRelease()).version;
@@ -143567,11 +143540,11 @@ async function composeOpamCacheKeys() {
     const ocamlVersion = ocamlCompiler.toLowerCase().replaceAll(/\W/g, "_");
     const sandboxed = OPAM_DISABLE_SANDBOXING ? "nosandbox" : "sandbox";
     const { year, week } = composeDate();
-    const key = `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-${week}`;
+    const key = `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-${week}`;
     const restoreKeys = [
-        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-${week}`,
-        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-`,
-        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-`,
+        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-${week}`,
+        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-`,
+        `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-`,
     ];
     return { key, restoreKeys };
 }
@@ -143613,8 +143586,7 @@ function composeCygwinCachePaths() {
 function composeDuneCachePaths() {
     const paths = [];
     const homeDir = external_node_os_namespaceObject.homedir();
-    const platform = system_getPlatform();
-    if (platform === constants_Platform.Win32) {
+    if (constants_PLATFORM === "win32") {
         const duneCacheDir = external_node_path_namespaceObject.join(homeDir, "Local Settings", "Cache", "dune");
         paths.push(duneCacheDir);
     }
@@ -143629,8 +143601,7 @@ function composeDuneCachePaths() {
 }
 function composeOpamCachePaths() {
     const paths = [];
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
         const opamRootCachePath = path.join("D:", ".opam");
         paths.push(opamRootCachePath);
         const { repo: { repo }, } = github.context;
@@ -143649,8 +143620,7 @@ function composeOpamCachePaths() {
 }
 function composeOpamDownloadCachePaths() {
     const paths = [];
-    const platform = system_getPlatform();
-    if (platform === constants_Platform.Win32) {
+    if (constants_PLATFORM === "win32") {
         const opamDownloadCachePath = external_node_path_namespaceObject.join("D:", ".opam", "download-cache");
         paths.push(opamDownloadCachePath);
     }
diff --git a/packages/setup-ocaml/src/cache.ts b/packages/setup-ocaml/src/cache.ts
index 225a809d..588869ab 100644
--- a/packages/setup-ocaml/src/cache.ts
+++ b/packages/setup-ocaml/src/cache.ts
@@ -9,18 +9,15 @@ import * as github from "@actions/github";
 import * as datefns from "date-fns";
 
 import {
+  ARCHITECTURE,
   CACHE_PREFIX,
   OCAML_COMPILER,
   OPAM_DISABLE_SANDBOXING,
   OPAM_REPOSITORIES,
-  Platform,
+  PLATFORM,
 } from "./constants.js";
 import { getLatestOpamRelease } from "./opam.js";
-import {
-  getArchitecture,
-  getPlatform,
-  getSystemIdentificationInfo,
-} from "./system.js";
+import { getSystemIdentificationInfo } from "./system.js";
 import { resolveCompiler } from "./version.js";
 import { getCygwinVersion } from "./win32.js";
 
@@ -48,8 +45,8 @@ async function composeCygwinCacheKeys() {
 }
 
 function composeDuneCacheKeys() {
-  const platform = getPlatform().replaceAll(/\W/g, "_");
-  const architecture = getArchitecture().replaceAll(/\W/g, "_");
+  const platform = PLATFORM.replaceAll(/\W/g, "_");
+  const architecture = ARCHITECTURE.replaceAll(/\W/g, "_");
   const { workflow: _workflow, job: _job, runId, runNumber } = github.context;
   const workflow = _workflow.toLowerCase().replaceAll(/\W/g, "_");
   const job = _job.replaceAll(/\W/g, "_");
@@ -64,15 +61,13 @@ function composeDuneCacheKeys() {
 }
 
 async function composeOpamCacheKeys() {
-  const platform = getPlatform();
   const fullPlatform =
-    platform === Platform.Win32
-      ? platform
+    PLATFORM === "win32"
+      ? PLATFORM
       : // eslint-disable-next-line unicorn/no-await-expression-member
-        `${platform}-${(await getSystemIdentificationInfo()).version}`;
-  const architecture = getArchitecture();
+        `${PLATFORM}-${(await getSystemIdentificationInfo()).version}`;
   const opamVersion =
-    platform === Platform.Win32
+    PLATFORM === "win32"
       ? "0.0.0.2"
       : // eslint-disable-next-line unicorn/no-await-expression-member
         (await getLatestOpamRelease()).version;
@@ -80,11 +75,11 @@ async function composeOpamCacheKeys() {
   const ocamlVersion = ocamlCompiler.toLowerCase().replaceAll(/\W/g, "_");
   const sandboxed = OPAM_DISABLE_SANDBOXING ? "nosandbox" : "sandbox";
   const { year, week } = composeDate();
-  const key = `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-${week}`;
+  const key = `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-${week}`;
   const restoreKeys = [
-    `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-${week}`,
-    `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-${year}-`,
-    `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${architecture}-${ocamlVersion}-`,
+    `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-${week}`,
+    `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-${year}-`,
+    `${CACHE_PREFIX}-setup-ocaml-opam-${opamVersion}-${sandboxed}-${fullPlatform}-${ARCHITECTURE}-${ocamlVersion}-`,
   ];
   return { key, restoreKeys };
 }
@@ -130,8 +125,7 @@ function composeCygwinCachePaths() {
 function composeDuneCachePaths() {
   const paths = [];
   const homeDir = os.homedir();
-  const platform = getPlatform();
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     const duneCacheDir = path.join(homeDir, "Local Settings", "Cache", "dune");
     paths.push(duneCacheDir);
   } else {
@@ -146,8 +140,7 @@ function composeDuneCachePaths() {
 
 function composeOpamCachePaths() {
   const paths = [];
-  const platform = getPlatform();
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     const opamRootCachePath = path.join("D:", ".opam");
     paths.push(opamRootCachePath);
     const {
@@ -175,8 +168,7 @@ function composeOpamCachePaths() {
 
 function composeOpamDownloadCachePaths() {
   const paths = [];
-  const platform = getPlatform();
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     const opamDownloadCachePath = path.join("D:", ".opam", "download-cache");
     paths.push(opamDownloadCachePath);
   } else {
diff --git a/packages/setup-ocaml/src/constants.ts b/packages/setup-ocaml/src/constants.ts
index 7e430afd..a6e3729c 100644
--- a/packages/setup-ocaml/src/constants.ts
+++ b/packages/setup-ocaml/src/constants.ts
@@ -1,22 +1,39 @@
+import * as os from "node:os";
 import * as path from "node:path";
 
 import * as core from "@actions/core";
 import * as yaml from "yaml";
 
-import { getPlatform } from "./system.js";
-
-export enum Architecture {
-  X86_64 = "x86_64",
-  ARM = "arm64",
-}
-
-export enum Platform {
-  Linux = "linux",
-  MacOS = "macos",
-  Win32 = "win32",
-}
-
-const platform = getPlatform();
+export const ARCHITECTURE = (() => {
+  switch (os.arch()) {
+    case "x64": {
+      return "x86_64";
+    }
+    case "arm64": {
+      return "arm64";
+    }
+    default: {
+      throw new Error("The architecture is not supported.");
+    }
+  }
+})();
+
+export const PLATFORM = (() => {
+  switch (os.platform()) {
+    case "linux": {
+      return "linux";
+    }
+    case "darwin": {
+      return "macos";
+    }
+    case "win32": {
+      return "win32";
+    }
+    default: {
+      throw new Error("The platform is not supported.");
+    }
+  }
+})();
 
 export const CYGWIN_ROOT = path.join("D:", "cygwin");
 
@@ -26,7 +43,7 @@ export const CYGWIN_ROOT_WRAPPERBIN = path.join(CYGWIN_ROOT, "wrapperbin");
 
 // [todo] remove the branch for Windows once opam 2.2 is released as stable.
 export const ALLOW_PRELEASE_OPAM =
-  platform !== Platform.Win32 &&
+  PLATFORM !== "win32" &&
   core.getBooleanInput("allow-prelease-opam", {
     required: false,
     trimWhitespace: true,
@@ -86,7 +103,7 @@ const repositories_yaml = yaml.parse(
 ) as Record<string, string> | null;
 
 const defaultRepository =
-  platform === Platform.Win32
+  PLATFORM === "win32"
     ? "https://github.com/ocaml-opam/opam-repository-mingw.git#sunset"
     : "https://github.com/ocaml/opam-repository.git";
 
diff --git a/packages/setup-ocaml/src/depext.ts b/packages/setup-ocaml/src/depext.ts
index f3977857..d92b4b0b 100644
--- a/packages/setup-ocaml/src/depext.ts
+++ b/packages/setup-ocaml/src/depext.ts
@@ -3,16 +3,14 @@ import * as path from "node:path";
 import * as core from "@actions/core";
 import { exec } from "@actions/exec";
 
-import { OPAM_DEPEXT_FLAGS, Platform } from "./constants.js";
-import { getPlatform } from "./system.js";
+import { OPAM_DEPEXT_FLAGS, PLATFORM } from "./constants.js";
 
 export async function installDepext(ocamlVersion: string) {
   await core.group("Install depext", async () => {
-    const platform = getPlatform();
     const depextCygwinports =
-      platform === Platform.Win32 ? ["depext-cygwinports"] : [];
+      PLATFORM === "win32" ? ["depext-cygwinports"] : [];
     await exec("opam", ["install", "opam-depext", ...depextCygwinports]);
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
       let base = "";
       if (ocamlVersion.includes("mingw64")) {
         base = "x86_64-w64-mingw32";
diff --git a/packages/setup-ocaml/src/installer.ts b/packages/setup-ocaml/src/installer.ts
index f9a1773d..ba0d2ad3 100644
--- a/packages/setup-ocaml/src/installer.ts
+++ b/packages/setup-ocaml/src/installer.ts
@@ -19,7 +19,7 @@ import {
   OPAM_DEPEXT,
   OPAM_PIN,
   OPAM_REPOSITORIES,
-  Platform,
+  PLATFORM,
 } from "./constants.js";
 import { installDepext, installDepextPackages } from "./depext.js";
 import { installDune } from "./dune.js";
@@ -31,11 +31,10 @@ import {
   setupOpam,
 } from "./opam.js";
 import { getOpamLocalPackages } from "./packages.js";
-import { getPlatform, updateUnixPackageIndexFiles } from "./system.js";
+import { updateUnixPackageIndexFiles } from "./system.js";
 import { resolveCompiler } from "./version.js";
 
 export async function installer() {
-  const platform = getPlatform();
   if (!ALLOW_PRELEASE_OPAM) {
     // [todo] remove this once opam 2.2 is released as stable.
     // https://github.com/ocaml/setup-ocaml/issues/299
@@ -49,11 +48,11 @@ export async function installer() {
   // https://github.com/ocaml/opam/issues/3447
   core.exportVariable("OPAMSOLVERTIMEOUT", 1000);
   core.exportVariable("OPAMYES", 1);
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     const opamRoot = path.join("D:", ".opam");
     core.exportVariable("OPAMROOT", opamRoot);
   }
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     await core.group("Change the file system behavior parameters", async () => {
       await exec("fsutil", ["behavior", "query", "SymlinkEvaluation"]);
       // https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-behavior
@@ -67,25 +66,25 @@ export async function installer() {
       await exec("fsutil", ["behavior", "query", "SymlinkEvaluation"]);
     });
   }
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     core.exportVariable("HOME", process.env["USERPROFILE"]);
     core.exportVariable("MSYS", "winsymlinks:native");
   }
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     await restoreCygwinCache();
   }
   const opamCacheHit = await restoreOpamCache();
   await setupOpam();
   await repositoryRemoveAll();
   await repositoryAddAll(OPAM_REPOSITORIES);
+  const ocamlCompiler = await resolveCompiler(OCAML_COMPILER);
   if (!opamCacheHit) {
-    const ocamlCompiler = await resolveCompiler(OCAML_COMPILER);
     await installOcaml(ocamlCompiler);
     await saveOpamCache();
   }
   await restoreOpamDownloadCache();
   if (OPAM_DEPEXT) {
-    await installDepext(platform);
+    await installDepext(ocamlCompiler);
   }
   if (DUNE_CACHE) {
     await restoreDuneCache();
diff --git a/packages/setup-ocaml/src/opam.ts b/packages/setup-ocaml/src/opam.ts
index 4b65d735..dc465d0d 100644
--- a/packages/setup-ocaml/src/opam.ts
+++ b/packages/setup-ocaml/src/opam.ts
@@ -13,16 +13,15 @@ import * as semver from "semver";
 import { saveCygwinCache } from "./cache.js";
 import {
   ALLOW_PRELEASE_OPAM,
+  ARCHITECTURE,
   CYGWIN_ROOT,
   CYGWIN_ROOT_BIN,
   CYGWIN_ROOT_WRAPPERBIN,
   GITHUB_TOKEN,
   OPAM_DISABLE_SANDBOXING,
-  Platform,
+  PLATFORM,
 } from "./constants.js";
 import {
-  getArchitecture,
-  getPlatform,
   getSystemIdentificationInfo,
   updateUnixPackageIndexFiles,
 } from "./system.js";
@@ -51,10 +50,8 @@ export async function getLatestOpamRelease() {
       "Could not retrieve the opam release matching the version constraint",
     );
   }
-  const architecture = getArchitecture();
-  const platform = getPlatform();
   const matchedAssets = latestRelease.assets.find((asset) =>
-    asset.browser_download_url.includes(`${architecture}-${platform}`),
+    asset.browser_download_url.includes(`${ARCHITECTURE}-${PLATFORM}`),
   );
   if (!matchedAssets) {
     throw new Error(
@@ -68,8 +65,7 @@ export async function getLatestOpamRelease() {
 }
 
 async function findOpam() {
-  const platform = getPlatform();
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     const opamPath = path.join(CYGWIN_ROOT, "bin", "opam.exe");
     return opamPath;
   } else {
@@ -80,8 +76,7 @@ async function findOpam() {
 
 async function acquireOpamUnix() {
   const { version, browserDownloadUrl } = await getLatestOpamRelease();
-  const architecture = getArchitecture();
-  const cachedPath = tc.find("opam", version, architecture);
+  const cachedPath = tc.find("opam", version, ARCHITECTURE);
   if (cachedPath === "") {
     const downloadedPath = await tc.downloadTool(browserDownloadUrl);
     core.info(`Acquired ${version} from ${browserDownloadUrl}`);
@@ -90,7 +85,7 @@ async function acquireOpamUnix() {
       "opam",
       "opam",
       version,
-      architecture,
+      ARCHITECTURE,
     );
     core.info(`Successfully cached opam to ${cachedPath}`);
     await fs.chmod(`${cachedPath}/opam`, 0o755);
@@ -104,9 +99,8 @@ async function acquireOpamUnix() {
 
 async function installUnixSystemPackages() {
   const isGitHubRunner = process.env["ImageOS"] !== undefined;
-  const platform = getPlatform();
   if (isGitHubRunner) {
-    if (platform === Platform.Linux) {
+    if (PLATFORM === "linux") {
       const { version: systemVersion } = await getSystemIdentificationInfo();
       if (systemVersion === "18.04") {
         // [info]: musl-tools bug in ubuntu 18.04;
@@ -125,7 +119,7 @@ async function installUnixSystemPackages() {
         "musl-tools",
         "rsync",
       ]);
-    } else if (platform === Platform.MacOS) {
+    } else if (PLATFORM === "macos") {
       await exec("brew", ["install", "darcs", "gpatch", "mercurial"]);
     }
   }
@@ -275,8 +269,7 @@ async function setupOpamWindows() {
 }
 
 export async function setupOpam() {
-  const platform = getPlatform();
-  if (platform === Platform.Win32) {
+  if (PLATFORM === "win32") {
     await setupOpamWindows();
   } else {
     await setupOpamUnix();
@@ -285,8 +278,7 @@ export async function setupOpam() {
 
 export async function installOcaml(ocamlCompiler: string) {
   await core.group("Install OCaml", async () => {
-    const platform = getPlatform();
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
       // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
       const originalPath = process.env["PATH"]!.split(path.delimiter);
       const patchedPath = [CYGWIN_ROOT_BIN, ...originalPath];
@@ -340,12 +332,11 @@ async function repositoryAdd(name: string, address: string) {
 
 export async function repositoryAddAll(repositories: [string, string][]) {
   await core.group("Initialise the opam repositories", async () => {
-    const platform = getPlatform();
     let restore_autocrlf;
     // Works around the lack of https://github.com/ocaml/opam/pull/3882 when
     // adding ocaml/opam-repository on Windows. Can be removed when the action
     // switches to opam 2.2
-    if (platform === Platform.Win32) {
+    if (PLATFORM === "win32") {
       const autocrlf = await getExecOutput(
         "git",
         ["config", "--global", "core.autocrlf"],
diff --git a/packages/setup-ocaml/src/system.ts b/packages/setup-ocaml/src/system.ts
index 8b63c014..ae86d93b 100644
--- a/packages/setup-ocaml/src/system.ts
+++ b/packages/setup-ocaml/src/system.ts
@@ -3,42 +3,10 @@ import * as os from "node:os";
 
 import { exec, getExecOutput } from "@actions/exec";
 
-import { Architecture, Platform } from "./constants.js";
-
-export function getArchitecture() {
-  switch (os.arch()) {
-    case "x64": {
-      return Architecture.X86_64;
-    }
-    case "arm64": {
-      return Architecture.ARM;
-    }
-    default: {
-      throw new Error("The architecture is not supported.");
-    }
-  }
-}
-
-export function getPlatform() {
-  switch (os.platform()) {
-    case "linux": {
-      return Platform.Linux;
-    }
-    case "darwin": {
-      return Platform.MacOS;
-    }
-    case "win32": {
-      return Platform.Win32;
-    }
-    default: {
-      throw new Error("The platform is not supported.");
-    }
-  }
-}
+import { PLATFORM } from "./constants.js";
 
 export async function getSystemIdentificationInfo() {
-  const platform = getPlatform();
-  if (platform === Platform.Linux) {
+  if (PLATFORM === "linux") {
     const osRelease = await fs.readFile("/etc/os-release", "utf8");
     const lines = osRelease.split(os.EOL);
     let id = "";
@@ -52,7 +20,7 @@ export async function getSystemIdentificationInfo() {
       }
     }
     return { id, version };
-  } else if (platform === Platform.MacOS) {
+  } else if (PLATFORM === "macos") {
     const swVers = await getExecOutput("sw_vers");
     const lines = swVers.stdout.split(os.EOL);
     let version = "";
@@ -70,11 +38,10 @@ export async function getSystemIdentificationInfo() {
 
 export async function updateUnixPackageIndexFiles() {
   const isGitHubRunner = process.env["ImageOS"] !== undefined;
-  const platform = getPlatform();
   if (isGitHubRunner) {
-    if (platform === Platform.Linux) {
+    if (PLATFORM === "linux") {
       await exec("sudo", ["apt-get", "update"]);
-    } else if (platform === Platform.MacOS) {
+    } else if (PLATFORM === "macos") {
       await exec("brew", ["update"]);
     }
   }
diff --git a/packages/setup-ocaml/src/version.ts b/packages/setup-ocaml/src/version.ts
index b673b687..d38f2921 100644
--- a/packages/setup-ocaml/src/version.ts
+++ b/packages/setup-ocaml/src/version.ts
@@ -3,8 +3,7 @@ import * as path from "node:path";
 import * as github from "@actions/github";
 import * as semver from "semver";
 
-import { GITHUB_TOKEN, Platform } from "./constants.js";
-import { getPlatform } from "./system.js";
+import { GITHUB_TOKEN, PLATFORM } from "./constants.js";
 
 function isSemverValidRange(semverVersion: string) {
   const isValidSemver =
@@ -17,12 +16,12 @@ function isSemverValidRange(semverVersion: string) {
 
 async function getAllCompilerVersions() {
   const octokit = github.getOctokit(GITHUB_TOKEN);
-  const platform = getPlatform();
-  const owner = platform === Platform.Win32 ? "ocaml-opam" : "ocaml";
+
+  const owner = PLATFORM === "win32" ? "ocaml-opam" : "ocaml";
   const repo =
-    platform === Platform.Win32 ? "opam-repository-mingw" : "opam-repository";
+    PLATFORM === "win32" ? "opam-repository-mingw" : "opam-repository";
   const prefix =
-    platform === Platform.Win32 ? "ocaml-variants" : "ocaml-base-compiler";
+    PLATFORM === "win32" ? "ocaml-variants" : "ocaml-base-compiler";
   const { data: packages } = await octokit.rest.repos.getContent({
     owner,
     repo,
@@ -62,9 +61,8 @@ async function resolveVersion(semverVersion: string) {
 }
 
 export async function resolveCompiler(compiler: string) {
-  const platform = getPlatform();
   const resolvedCompiler = isSemverValidRange(compiler)
-    ? platform === Platform.Win32
+    ? PLATFORM === "win32"
       ? `ocaml-variants.${await resolveVersion(compiler)}+mingw64c`
       : `ocaml-base-compiler.${await resolveVersion(compiler)}`
     : compiler;