diff --git a/src/cypress.ts b/src/cypress.ts
index c3b08dd..f91f22a 100644
--- a/src/cypress.ts
+++ b/src/cypress.ts
@@ -18,20 +18,18 @@ export function cypressConfig(files: string[] = ['cypress/**/*.[jt]s']): Record<
         //  so skipping them until it's possible to add directory configuration for Jest rules.
         files,
         languageOptions: {
-            ...cypressOptionalConfig.languageOptions,
+            sourceType: 'module',
+            ecmaVersion: 'latest',
             parser: tsEslint.parser,
             parserOptions: {
-                // Parser options have to be duplicated when the parser is overridden
-                ecmaVersion: 6,
                 ecmaFeatures: {
                     globalReturn: false,
                     impliedStrict: true,
                 },
-                sourceType: 'module',
-                // TypeScript ESLint Parser
-                project: './tsconfig.json',
+                projectService: true,
                 warnOnUnsupportedTypeScriptVersion: true,
             },
+            ...cypressOptionalConfig.languageOptions,
         },
         plugins: {
             ...cypressOptionalConfig.plugins,
diff --git a/src/index.ts b/src/index.ts
index 3ddd710..91b8799 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -31,17 +31,18 @@ export default [
     {
         files: ['**/*.[jt]s?(x)'],
         languageOptions: {
+            sourceType: 'module',
+            ecmaVersion: 'latest',
             parser: tsEslint.parser,
             parserOptions: {
-                // Parser options have to be duplicated when the parser is overridden
-                ecmaVersion: 6,
                 ecmaFeatures: {
                     globalReturn: false,
                     impliedStrict: true,
                 },
-                sourceType: 'module',
-                // TypeScript ESLint Parser
-                project: './tsconfig.json',
+                projectService: {
+                    // Allow parsing JS config files that are not listed in the tsconfig
+                    allowDefaultProject: ['?(.)*.?(m|c)js'],
+                },
                 warnOnUnsupportedTypeScriptVersion: true,
             },
         },
@@ -111,17 +112,15 @@ export default [
     {
         files: ['**/*.ts?(x)'],
         languageOptions: {
+            sourceType: 'module',
+            ecmaVersion: 'latest',
             parser: tsEslint.parser,
             parserOptions: {
-                // Parser options have to be duplicated when the parser is overridden
-                ecmaVersion: 6,
                 ecmaFeatures: {
                     globalReturn: false,
                     impliedStrict: true,
                 },
-                sourceType: 'module',
-                // TypeScript ESLint Parser
-                project: './tsconfig.json',
+                projectService: true,
                 warnOnUnsupportedTypeScriptVersion: true,
             },
         },
diff --git a/src/rxjs.ts b/src/rxjs.ts
index 633d558..23c1f6a 100644
--- a/src/rxjs.ts
+++ b/src/rxjs.ts
@@ -12,17 +12,15 @@ export function rxjsConfig(files: string[] = ['**/*.ts?(x)']): Record<string, un
     return {
         files,
         languageOptions: {
+            sourceType: 'module',
+            ecmaVersion: 'latest',
             parser: tsEslint.parser,
             parserOptions: {
-                // Parser options have to be duplicated when the parser is overridden
-                ecmaVersion: 6,
                 ecmaFeatures: {
                     globalReturn: false,
                     impliedStrict: true,
                 },
-                sourceType: 'module',
-                // TypeScript ESLint Parser
-                project: './tsconfig.json',
+                projectService: true,
                 warnOnUnsupportedTypeScriptVersion: true,
             },
         },