diff --git a/packages/kbn-monaco/src/esql/lib/ast/ast_helpers.ts b/packages/kbn-monaco/src/esql/lib/ast/ast_helpers.ts
index e72c5892c2116..b390d51d0451c 100644
--- a/packages/kbn-monaco/src/esql/lib/ast/ast_helpers.ts
+++ b/packages/kbn-monaco/src/esql/lib/ast/ast_helpers.ts
@@ -9,10 +9,9 @@
 import type { ParserRuleContext } from 'antlr4ts/ParserRuleContext';
 import { ErrorNode } from 'antlr4ts/tree/ErrorNode';
 import type { TerminalNode } from 'antlr4ts/tree/TerminalNode';
-import {
+import type {
   ArithmeticUnaryContext,
   DecimalValueContext,
-  esql_parser,
   IntegerValueContext,
   QualifiedIntegerLiteralContext,
 } from '../../antlr/esql_parser';
@@ -161,17 +160,18 @@ export function computeLocationExtends(fn: ESQLFunction) {
   return location;
 }
 
+// Note: do not import esql_parser or bundle size will grow up by ~500 kb
 function getQuotedText(ctx: ParserRuleContext) {
   return (
-    ctx.tryGetToken(esql_parser.SRC_QUOTED_IDENTIFIER, 0) ||
-    ctx.tryGetToken(esql_parser.QUOTED_IDENTIFIER, 0)
+    ctx.tryGetToken(73 /* esql_parser.SRC_QUOTED_IDENTIFIER*/, 0) ||
+    ctx.tryGetToken(64 /* esql_parser.QUOTED_IDENTIFIER */, 0)
   );
 }
 
 function getUnquotedText(ctx: ParserRuleContext) {
   return (
-    ctx.tryGetToken(esql_parser.SRC_UNQUOTED_IDENTIFIER, 0) ||
-    ctx.tryGetToken(esql_parser.UNQUOTED_IDENTIFIER, 0)
+    ctx.tryGetToken(72 /* esql_parser.SRC_UNQUOTED_IDENTIFIER */, 0) ||
+    ctx.tryGetToken(63 /* esql_parser.UNQUOTED_IDENTIFIER */, 0)
   );
 }