diff --git a/package.json b/package.json
index a7dba018..966933fb 100644
--- a/package.json
+++ b/package.json
@@ -50,8 +50,11 @@
   },
   "devDependencies": {
     "@biomejs/biome": "1.8.2",
+    "@types/didyoumean": "1.2.2",
+    "@types/js-yaml": "4.0.9",
     "@types/lodash": "4.17.5",
     "@types/node": "20.14.6",
+    "@types/swagger2openapi": "7.0.4",
     "axios": "1.7.2",
     "shx": "0.3.4",
     "vitest": "1.6.0"
diff --git a/src/util/file-system.js b/src/util/file-system.js
index 3bf750a7..15ea38bd 100644
--- a/src/util/file-system.js
+++ b/src/util/file-system.js
@@ -25,7 +25,7 @@ class FileSystem {
   }
 
   getFileContent = (path) => {
-    return fs.readFileSync(path, { encoding: "UTF-8" });
+    return fs.readFileSync(path, { encoding: "utf8" });
   };
 
   readDir = (path) => {
diff --git a/yarn.lock b/yarn.lock
index 07f4c795..aeca7a46 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -478,6 +478,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/didyoumean@npm:1.2.2":
+  version: 1.2.2
+  resolution: "@types/didyoumean@npm:1.2.2"
+  checksum: 10c0/59dbc10061ef486a672b222c55f2183e71c34e575652a1e2a88412b31086065d6a38ee046eca8a7568d2cf0fa86ee13df7dfa9e68dbe28ea829ba284c1673fb6
+  languageName: node
+  linkType: hard
+
 "@types/estree@npm:1.0.5, @types/estree@npm:^1.0.0":
   version: 1.0.5
   resolution: "@types/estree@npm:1.0.5"
@@ -485,6 +492,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/js-yaml@npm:4.0.9":
+  version: 4.0.9
+  resolution: "@types/js-yaml@npm:4.0.9"
+  checksum: 10c0/24de857aa8d61526bbfbbaa383aa538283ad17363fcd5bb5148e2c7f604547db36646440e739d78241ed008702a8920665d1add5618687b6743858fae00da211
+  languageName: node
+  linkType: hard
+
 "@types/lodash@npm:4.17.5":
   version: 4.17.5
   resolution: "@types/lodash@npm:4.17.5"
@@ -492,7 +506,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:20.14.6":
+"@types/node@npm:*, @types/node@npm:20.14.6":
   version: 20.14.6
   resolution: "@types/node@npm:20.14.6"
   dependencies:
@@ -508,6 +522,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/swagger2openapi@npm:7.0.4":
+  version: 7.0.4
+  resolution: "@types/swagger2openapi@npm:7.0.4"
+  dependencies:
+    "@types/node": "npm:*"
+    openapi-types: "npm:^12.1.0"
+  checksum: 10c0/bd13f18f64cb4e8e15ef15e005b85422d929a792a4f32217dd476caa2efc8d0241aac22914c53addb94711455e7a353973d6383290e06bd69c73468f0b29898d
+  languageName: node
+  linkType: hard
+
 "@vitest/expect@npm:1.6.0":
   version: 1.6.0
   resolution: "@vitest/expect@npm:1.6.0"
@@ -1930,6 +1954,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"openapi-types@npm:^12.1.0":
+  version: 12.1.3
+  resolution: "openapi-types@npm:12.1.3"
+  checksum: 10c0/4ad4eb91ea834c237edfa6ab31394e87e00c888fc2918009763389c00d02342345195d6f302d61c3fd807f17723cd48df29b47b538b68375b3827b3758cd520f
+  languageName: node
+  linkType: hard
+
 "p-limit@npm:^5.0.0":
   version: 5.0.0
   resolution: "p-limit@npm:5.0.0"
@@ -2526,9 +2557,12 @@ __metadata:
   resolution: "swagger-typescript-api@workspace:."
   dependencies:
     "@biomejs/biome": "npm:1.8.2"
+    "@types/didyoumean": "npm:1.2.2"
+    "@types/js-yaml": "npm:4.0.9"
     "@types/lodash": "npm:4.17.5"
     "@types/node": "npm:20.14.6"
     "@types/swagger-schema-official": "npm:^2.0.25"
+    "@types/swagger2openapi": "npm:7.0.4"
     axios: "npm:1.7.2"
     cosmiconfig: "npm:^9.0.0"
     didyoumean: "npm:^1.2.2"