update driftless interval and timeout functions to also allow strings

types/driftless/index.d.ts

@@ -4,13 +4,13 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 export function setDriftlessTimeout(
-    callback: (...args: any[]) => void,
+    callback: ((...args: any[]) => void) | string,
     delayMs: number,
     ...params: any[]
 ): number;
 
 export function setDriftlessInterval(
-    callback: (...args: any[]) => void,
+    callback: ((...args: any[]) => void) | string,
     delayMs: number,
     ...params: any[]
 ): number;