From 9ab34c23016423611e218b98f3ffaca9c9bca885 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Acid=20Chicken=20=28=E7=A1=AB=E9=85=B8=E9=B6=8F=29?=
 <root@acid-chicken.com>
Date: Sat, 15 Dec 2018 20:54:34 +0900
Subject: [PATCH] Update index.ts (#3624)

---
 src/chart/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/chart/index.ts b/src/chart/index.ts
index ccfcef39ab..58ab7f7f4f 100644
--- a/src/chart/index.ts
+++ b/src/chart/index.ts
@@ -64,7 +64,7 @@ export default abstract class Chart<T> {
 		const keys = {
 			span: -1,
 			date: -1
-		} as any;
+		} as { [key: string]: 1 | -1; };
 		if (grouped) keys.group = -1;
 		this.collection.createIndex(keys, { unique: true });
 	}