Fix ignored forX initializer (#20204)

changelog_unreleased/javascript/20204.md

@@ -0,0 +1,13 @@
+#### Fix `prettier-ignore`d `for` initializer (#20204 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+for (/* prettier-ignore */ let i  = 0; i < 1; i++) {}
+
+// Prettier stable
+for (/* prettier-ignore */ let i  = 0;; i < 1; i++) {}
+
+// Prettier main
+for (/* prettier-ignore */ let i  = 0; i < 1; i++) {}
+```