fix an infinite loop which happens when autometrics is initialized in a node service without a git repository (#149)

* fix an infinite loop which happens when autometrics is initialized in a node service without a git repository

* break readClosest after root path attempt

* fix type annotation, as well as path usage

Author: benjibuiltit

packages/autometrics/src/platform.node.ts

@@ -4,7 +4,7 @@
 
 import { AsyncLocalStorage } from "node:async_hooks";
 import { readFileSync } from "node:fs";
-import { dirname, join } from "node:path";
+import { dirname, join, parse } from "node:path";
 
 import { AUTOMETRICS_DEFAULT_SERVICE_NAME } from "./constants.ts";
 import { getGitRepositoryUrl, getPackageStringField } from "./platformUtils.ts";
@@ -112,6 +112,15 @@ export function getALSInstance() {
   }>();
 }
 
+/**
+ * Returns a boolean indicating whether a given path is the file-system root or not.
+ *
+ * @internal
+ */
+export function isRootPath(pathToCheck: string): boolean {
+  return pathToCheck == parse(getCwd()).root;
+}
+
 function detectPackageName(): string | undefined {
   try {
     const gitConfig = readClosest("package.json");
@@ -139,6 +148,10 @@ function readClosest(path: string): Uint8Array {
     try {
       return readFileSync(join(basePath, path));
     } catch {
+      // Break once we've tried the file-system root
+      if (isRootPath(basePath)) {
+        break;
+      }
       basePath = dirname(basePath);
     }
   }