From 3e2673362ffadf6ffbf0db865312520472e1ce6f Mon Sep 17 00:00:00 2001
From: "Mi Feng (Mia)" <miamfeng@gmail.com>
Date: Sat, 27 Apr 2024 16:35:27 -0700
Subject: [PATCH] Attempt to fixing the type issue

---
 src/types/Chart.ts | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/types/Chart.ts b/src/types/Chart.ts
index cd72d3a55..a268fd4c3 100644
--- a/src/types/Chart.ts
+++ b/src/types/Chart.ts
@@ -680,10 +680,16 @@ export interface MarkBounds {
 	y2: number;
 }
 
+const DatumPredefinedKey = {
+	markId: MARK_ID,
+	seriesId: SERIES_ID,
+	trendlineValue: TRENDLINE_VALUE,
+} as const;
+
 export interface Datum {
-	[MARK_ID]: number;
-	[SERIES_ID]: string;
-	[TRENDLINE_VALUE]?: number;
+	[DatumPredefinedKey.markId]: number;
+	[DatumPredefinedKey.seriesId]: string;
+	[DatumPredefinedKey.trendlineValue]?: number;
 	[key: string]: unknown;
 }