Fix unreadable wtfnode output

test/wtfnode.ts

@@ -1,7 +1,23 @@
+import * as util from "util"
 import * as wtfnode from "wtfnode"
 
+// Jest seems to hijack console.log in a way that makes the output difficult to
+// read. So we'll write directly to process.stderr instead.
+const write = (...args: [any, ...any]) => {
+  if (args.length > 0) {
+    process.stderr.write(util.format(...args) + "\n")
+  }
+}
+wtfnode.setLogger("info", write)
+wtfnode.setLogger("warn", write)
+wtfnode.setLogger("error", write)
+
 let active = false
 
+/**
+ * Start logging open handles periodically. This can be used to see what is
+ * hanging open if anything.
+ */
 export function setup(): void {
   if (active) {
     return