refactor: share duplicate script helpers

scripts/lib/package-root-args.mjs

@@ -0,0 +1,23 @@
+import path from "node:path";
+import process from "node:process";
+import { fileURLToPath } from "node:url";
+
+const defaultPackageRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..", "..");
+
+export function parsePackageRootArg(argv, envName) {
+  let packageRoot = process.env[envName];
+  for (let index = 0; index < argv.length; index += 1) {
+    const arg = argv[index];
+    if (arg === "--package-root") {
+      packageRoot = argv[index + 1];
+      index += 1;
+      continue;
+    }
+    if (arg?.startsWith("--package-root=")) {
+      packageRoot = arg.slice("--package-root=".length);
+      continue;
+    }
+    throw new Error(`unknown argument: ${arg}`);
+  }
+  return { packageRoot: path.resolve(packageRoot ?? defaultPackageRoot) };
+}