fix: Switch YAML library for ESM compatibility

Author: mvsde

package-lock.json

@@ -129,15 +129,16 @@
 		"vscode:prepublish": "npm run build"
 	},
 	"config": {
-		"esbuild": "./src/extension.ts --bundle --outfile=out/extension.js --external:vscode --external:yaml --platform=node --target=node22.15 --format=esm --sourcemap"
+		"esbuild": "./src/extension.ts --bundle --outfile=out/extension.js --external:vscode --platform=node --target=node22.15 --format=esm --sourcemap"
 	},
 	"dependencies": {
 		"deepmerge": "^4.3.1",
-		"semver": "^7.7.2",
-		"yaml": "^2.8.0"
+		"js-yaml": "^4.1.0",
+		"semver": "^7.7.2"
 	},
 	"devDependencies": {
 		"@eslint/js": "^9.31.0",
+		"@types/js-yaml": "^4.0.9",
 		"@types/json-schema": "^7.0.15",
 		"@types/node": "^24.0.14",
 		"@types/vscode": "^1.102.0",

package.json

@@ -1,8 +1,8 @@
 import path from 'node:path'
 
+import YAML from 'js-yaml'
 import { JSONSchema7 } from 'json-schema'
 import { RelativePattern, Uri, workspace } from 'vscode'
-import YAML from 'yaml'
 
 import { EXCLUDE_GLOB, SCHEMA_GLOB } from '../constants.ts'
 import type { Schema } from '../types.ts'
@@ -18,7 +18,7 @@ async function convertSchema(uri: Uri): Promise<Schema> {
 		}
 
 		if (extension === 'yaml') {
-			content = YAML.parse(file.toString())
+			content = YAML.load(file.toString()) as JSONSchema7
 		}
 	} catch {
 		content = {}