fix: check if the parser is built-in

lib/linter/linter.js

@@ -433,16 +433,19 @@ function getDirectiveComments(filename, ast, ruleMapper, warnInlineConfig) {
 
 /**
  * Normalize ECMAScript version from the initial config
+ * @param {Parser} parser The parser which uses this options.
  * @param {number} ecmaVersion ECMAScript version from the initial config
  * @returns {number} normalized ECMAScript version
  */
-function normalizeEcmaVersion(ecmaVersion) {
-    if (ecmaVersion === void 0) {
-        return DEFAULT_ECMA_VERSION;
-    }
+function normalizeEcmaVersion(parser, ecmaVersion) {
+    if (parser === espree) {
+        if (ecmaVersion === void 0) {
+            return DEFAULT_ECMA_VERSION;
+        }
 
-    if (ecmaVersion === "latest") {
-        return espree.latestEcmaVersion;
+        if (ecmaVersion === "latest") {
+            return espree.latestEcmaVersion;
+        }
     }
 
     /*
@@ -529,12 +532,12 @@ function normalizeVerifyOptions(providedOptions, config) {
 
 /**
  * Combines the provided parserOptions with the options from environments
- * @param {string} parserName The parser name which uses this options.
+ * @param {Parser} parser The parser which uses this options.
  * @param {ParserOptions} providedOptions The provided 'parserOptions' key in a config
  * @param {Environment[]} enabledEnvironments The environments enabled in configuration and with inline comments
  * @returns {ParserOptions} Resulting parser options after merge
  */
-function resolveParserOptions(parserName, providedOptions, enabledEnvironments) {
+function resolveParserOptions(parser, providedOptions, enabledEnvironments) {
     const parserOptionsFromEnv = enabledEnvironments
         .filter(env => env.parserOptions)
         .reduce((parserOptions, env) => merge(parserOptions, env.parserOptions), {});
@@ -550,7 +553,7 @@ function resolveParserOptions(parserName, providedOptions, enabledEnvironments)
         mergedParserOptions.ecmaFeatures = Object.assign({}, mergedParserOptions.ecmaFeatures, { globalReturn: false });
     }
 
-    mergedParserOptions.ecmaVersion = normalizeEcmaVersion(mergedParserOptions.ecmaVersion);
+    mergedParserOptions.ecmaVersion = normalizeEcmaVersion(parser, mergedParserOptions.ecmaVersion);
 
     return mergedParserOptions;
 }