fix: address PR review — add Node 18 fallback and broaden path assertions

- Use `fileURLToPath(import.meta.url)` fallback for Node < 20.11.0
- Broaden smoke test and build integrity checks to catch any hardcoded
  absolute path (Unix + Windows), not just `home/runner`

Author: suryaiyer95

.github/workflows/release.yml

@@ -161,9 +161,9 @@ jobs:
             echo "::error::node_python_bridge.py missing from dbt-tools dist"
             exit 1
           fi
-          # Verify no hardcoded CI runner paths remain in the bundle
-          if grep -q 'home/runner' packages/dbt-tools/dist/index.js; then
-            echo "::error::dbt-tools bundle contains hardcoded CI runner path"
+          # Verify no hardcoded absolute path in __dirname (catches any CI runner OS)
+          if grep -qE 'var __dirname\s*=\s*"(/|[A-Za-z]:\\)' packages/dbt-tools/dist/index.js; then
+            echo "::error::dbt-tools bundle contains hardcoded absolute path in __dirname"
             exit 1
           fi
           # Verify __dirname was patched to runtime resolution

packages/dbt-tools/script/copy-python.ts

@@ -22,7 +22,10 @@ const indexPath = join(dist, "index.js")
 let code = readFileSync(indexPath, "utf8")
 const pattern = /var __dirname\s*=\s*"[^"]*python-bridge[^"]*"/
 if (pattern.test(code)) {
-  code = code.replace(pattern, `var __dirname = import.meta.dirname`)
+  // Fallback for Node < 20.11.0 where import.meta.dirname is unavailable.
+  // The bundle already imports fileURLToPath from "url", so path + url are in scope.
+  const replacement = `var __dirname = typeof import.meta.dirname === "string" ? import.meta.dirname : path.dirname(fileURLToPath(import.meta.url))`
+  code = code.replace(pattern, replacement)
   writeFileSync(indexPath, code)
   console.log(`Patched __dirname in dist/index.js`)
 } else {

packages/dbt-tools/test/build-integrity.test.ts

@@ -15,14 +15,14 @@ describe("build integrity", () => {
     expect(existsSync(join(dist, "node_python_bridge.py"))).toBe(true)
   })
 
-  test("no hardcoded CI runner paths in bundle", () => {
+  test("no hardcoded absolute paths in __dirname", () => {
     const code = readFileSync(join(dist, "index.js"), "utf8")
-    expect(code).not.toContain("home/runner")
+    // Catch both Unix ("/...") and Windows ("C:\\...") hardcoded paths
+    expect(code).not.toMatch(/var __dirname\s*=\s*"(?:[A-Za-z]:\\\\|\/)/)
   })
 
   test("__dirname is patched to runtime resolution", () => {
     const code = readFileSync(join(dist, "index.js"), "utf8")
     expect(code).toContain("import.meta.dirname")
-    expect(code).not.toMatch(/var __dirname\s*=\s*"\//)
   })
 })