Fix some TSLint issues (#3605)

src/sql/base/browser/ui/table/asyncDataView.ts

@@ -11,7 +11,7 @@ export interface IObservableCollection<T> {
 	at(index: number): T;
 	getRange(start: number, end: number): T[];
 	setCollectionChangedCallback(callback: (startIndex: number, count: number) => void): void;
-	setLength(number): void;
+	setLength(length: number): void;
 	dispose(): void;
 }
 
@@ -115,8 +115,8 @@ export class VirtualizedCollection<T extends Slick.SlickData> implements IObserv
 		return this.length;
 	}
 
-	setLength(number: any): void {
-		this.length = number;
+	setLength(length: number): void {
+		this.length = length;
 	}
 
 	public at(index: number): T {