Extract constant

extensions/markdown-language-features/src/util/topmostLineMonitor.ts

@@ -4,16 +4,16 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-
 import { disposeAll } from '../util/dispose';
 import { isMarkdownFile } from './file';
 
-
 export class MarkdownFileTopmostLineMonitor {
 	private readonly disposables: vscode.Disposable[] = [];
 
 	private readonly pendingUpdates = new Map<string, number>();
 
+	private readonly throttle = 50;
+
 	constructor() {
 		vscode.window.onDidChangeTextEditorVisibleRanges(event => {
 			if (isMarkdownFile(event.textEditor.document)) {
@@ -47,7 +47,7 @@ export class MarkdownFileTopmostLineMonitor {
 					});
 					this.pendingUpdates.delete(key);
 				}
-			}, 50);
+			}, this.throttle);
 		}
 
 		this.pendingUpdates.set(key, line);