Remove js yaml (#9016)

fix #9015

Author: timotheeguerin

.chronus/changes/remove-js-yaml-2025-10-17-18-13-50.md

@@ -0,0 +1,8 @@
+---
+# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
+changeKind: fix
+packages:
+  - "@typespec/spector"
+---
+
+Switch `js-yaml` to `yaml` library

packages/spector/package.json

@@ -36,7 +36,6 @@
   "homepage": "https://github.com/microsoft/typespec#readme",
   "dependencies": {
     "@azure/identity": "~4.13.0",
-    "@types/js-yaml": "^4.0.5",
     "@typespec/compiler": "workspace:^",
     "@typespec/http": "workspace:^",
     "@typespec/rest": "workspace:^",
@@ -48,13 +47,13 @@
     "deep-equal": "^2.2.0",
     "express": "^5.1.0",
     "globby": "~15.0.0",
-    "js-yaml": "^4.1.0",
     "micromatch": "^4.0.8",
     "morgan": "^1.10.0",
     "multer": "^2.0.1",
     "picocolors": "~1.1.1",
     "source-map-support": "~0.5.21",
     "xml2js": "^0.6.2",
+    "yaml": "~2.8.0",
     "yargs": "~18.0.0"
   },
   "devDependencies": {

packages/spector/src/config/config.ts

@@ -1,5 +1,5 @@
 import { readFile } from "fs/promises";
-import yaml from "js-yaml";
+import yaml from "yaml";
 import { Diagnostic } from "../utils/diagnostic-reporter.js";
 import { SpecConfigJsonSchema } from "./config-schema.js";
 import { SchemaValidator } from "./schema-validator.js";
@@ -9,7 +9,7 @@ const validator = new SchemaValidator(SpecConfigJsonSchema);
 
 export async function loadSpecConfig(path: string): Promise<[SpecConfig, Diagnostic[]]> {
   const content = await readFile(path);
-  const config: any = yaml.load(content.toString(), { filename: path });
+  const config: any = yaml.parse(content.toString());
   const diagnostics = validator.validate(config, path);
   return [config, diagnostics];
 }