fix: improve WSL2 systemd daemon hints

src/infra/wsl.ts

@@ -0,0 +1,25 @@
+import fs from "node:fs/promises";
+
+let wslCached: boolean | null = null;
+
+export function isWSLEnv(): boolean {
+  if (process.env.WSL_INTEROP || process.env.WSL_DISTRO_NAME || process.env.WSLENV) {
+    return true;
+  }
+  return false;
+}
+
+export async function isWSL(): Promise<boolean> {
+  if (wslCached !== null) return wslCached;
+  if (isWSLEnv()) {
+    wslCached = true;
+    return wslCached;
+  }
+  try {
+    const release = await fs.readFile("/proc/sys/kernel/osrelease", "utf8");
+    wslCached = release.toLowerCase().includes("microsoft") || release.toLowerCase().includes("wsl");
+  } catch {
+    wslCached = false;
+  }
+  return wslCached;
+}