fix: adjust "is source type module" checks for flat config

Also see jest-community/eslint-plugin-jest#1639

Author: G-Rath

src/rules/no-default-export.js

@@ -15,7 +15,10 @@ module.exports = {
 
   create(context) {
     // ignore non-modules
-    if (context.parserOptions.sourceType !== 'module') {
+    if (
+      context.parserOptions.sourceType !== 'module'
+      && (!context.languageOptions || context.languageOptions.sourceType !== 'module')
+    ) {
       return {};
     }
 

src/rules/no-named-export.js

@@ -13,7 +13,10 @@ module.exports = {
 
   create(context) {
     // ignore non-modules
-    if (context.parserOptions.sourceType !== 'module') {
+    if (
+      context.parserOptions.sourceType !== 'module'
+      && (!context.languageOptions || context.languageOptions.sourceType !== 'module')
+    ) {
       return {};
     }
 

src/rules/unambiguous.js

@@ -19,7 +19,10 @@ module.exports = {
 
   create(context) {
     // ignore non-modules
-    if (context.parserOptions.sourceType !== 'module') {
+    if (
+      context.parserOptions.sourceType !== 'module'
+      && (!context.languageOptions || context.languageOptions.sourceType !== 'module')
+    ) {
       return {};
     }