From c9be94f5ba3423437ff273fe4ec8a6376cfae77d Mon Sep 17 00:00:00 2001
From: Sosuke Suzuki <sosuke.suzuki@dr-ubie.com>
Date: Sun, 5 Mar 2023 23:55:42 +0900
Subject: [PATCH] fix(eslint-plugin): fix printing BigInt literal

---
 .../src/rules/no-redundant-type-constituents.ts           | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts b/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts
index 33237a8ae4e2..2ba163487785 100644
--- a/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts
+++ b/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts
@@ -83,7 +83,13 @@ function describeLiteralType(type: ts.Type): string {
   }
 
   if (type.isLiteral()) {
-    return type.value.toString();
+    if (typeof type.value === 'string' || typeof type.value === 'number') {
+      return type.value.toString();
+    }
+    // type.valeus is ts.PseudoBigInt
+    return `${
+      type.value.negative ? '-' : ''
+    }${type.value.base10Value.toString()}n`;
   }
 
   if (util.isTypeAnyType(type)) {