blockString-fuzz: improve lexValue typing (#2966)

graphql · Mar 13, 2021 · 8109e42 · 8109e42
1 parent afffdfe
commit 8109e42
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/language/__tests__/blockString-fuzz.js b/src/language/__tests__/blockString-fuzz.js
@@ -10,10 +10,11 @@ import { Lexer } from '../lexer';
 import { Source } from '../source';
 import { printBlockString } from '../blockString';
 
-function lexValue(str: string) {
+function lexValue(str: string): string {
   const lexer = new Lexer(new Source(str));
   const value = lexer.advance().value;
 
+  invariant(typeof value === 'string');
   invariant(lexer.advance().kind === '<EOF>', 'Expected EOF');
   return value;
 }