From 321db7e2183bf3dd93d90e65689cb319cbd22138 Mon Sep 17 00:00:00 2001
From: Adan Toscano <adantoscano@gmail.com>
Date: Tue, 3 Oct 2023 14:38:36 +0100
Subject: [PATCH] feat: read just the first line

---
 package-lock.json                 | 9 +++++++++
 package.json                      | 2 ++
 src/services/find-oas-from-dir.js | 8 +++++---
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 09370e5..2ee396c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "0.0.0",
       "license": "MPL-2.0",
       "dependencies": {
+        "n-readlines": "^1.0.1",
         "open-api-mocker": "github:adantoscano/open-api-mocker"
       }
     },
@@ -955,6 +956,14 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
       "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
     },
+    "node_modules/n-readlines": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/n-readlines/-/n-readlines-1.0.1.tgz",
+      "integrity": "sha512-z4SyAIVgMy7CkgsoNw7YVz40v0g4+WWvvqy8+ZdHrCtgevcEO758WQyrYcw3XPxcLxF+//RszTz/rO48nzD0wQ==",
+      "engines": {
+        "node": ">=6.x.x"
+      }
+    },
     "node_modules/negotiator": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
diff --git a/package.json b/package.json
index d952641..c929955 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "0.0.0",
   "description": "Create mocks servers with its schemas",
   "main": "src/index.js",
+  "type": "module",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "start": "node ."
@@ -10,6 +11,7 @@
   "author": "",
   "license": "MPL-2.0",
   "dependencies": {
+    "n-readlines": "^1.0.1",
     "open-api-mocker": "github:adantoscano/open-api-mocker"
   }
 }
diff --git a/src/services/find-oas-from-dir.js b/src/services/find-oas-from-dir.js
index ddce8cf..7d77707 100644
--- a/src/services/find-oas-from-dir.js
+++ b/src/services/find-oas-from-dir.js
@@ -1,10 +1,12 @@
 import path from 'path';
 import * as fs from 'fs';
+import nReadlines from 'n-readlines'
 
 function isOas(filePath) {
-  const fileString = fs.readFileSync(filePath, 'utf8')
+  const line = new nReadlines(filePath);
+  const firstLine = line.next().toString();
   const oasRegEx = /^openapi/i
-  return oasRegEx.test(fileString);
+  return oasRegEx.test(firstLine);
 }
 
 export default function findOasFromDir(startPath) {
@@ -18,7 +20,7 @@ export default function findOasFromDir(startPath) {
     const filePath = path.join(startPath, file);
     const stat = fs.lstatSync(filePath);
     if (stat.isDirectory()) {
-      return [...acc, ...findOasFromDir(filePath)]; //recurse
+      return [...acc, ...findOasFromDir(filePath)];
     } 
     if (file.endsWith('.yaml') && isOas(filePath)) {
       console.log('-- found: ', filePath);