diff --git a/src/lang-promql/index.ts b/src/lang-promql/index.ts
index e21d3d7..a14e5ae 100644
--- a/src/lang-promql/index.ts
+++ b/src/lang-promql/index.ts
@@ -23,4 +23,4 @@
 export { PrometheusClient } from './client';
 export { CompleteConfiguration, CompleteStrategy } from './complete';
 export { LintStrategy } from './lint';
-export { PromQLExtension, LanguageType } from './promql';
+export { PromQLExtension, LanguageType, promQLLanguage } from './promql';
diff --git a/src/lang-promql/promql.ts b/src/lang-promql/promql.ts
index 27560a1..ec720d3 100644
--- a/src/lang-promql/promql.ts
+++ b/src/lang-promql/promql.ts
@@ -33,7 +33,7 @@ export enum LanguageType {
   MetricName = 'MetricName',
 }
 
-function promQLLanguage(top: LanguageType) {
+export function promQLLanguage(top: LanguageType) {
   return LezerLanguage.define({
     parser: parser.configure({
       top: top,