From 78fb9afda573b6f738fdab76c01d119f9b861201 Mon Sep 17 00:00:00 2001
From: ssube <seansube@gmail.com>
Date: Mon, 2 Mar 2020 18:33:48 -0600
Subject: [PATCH] lint: fix nulls

---
 test/helpers/async.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/test/helpers/async.ts b/test/helpers/async.ts
index 226555f..6cf68c4 100644
--- a/test/helpers/async.ts
+++ b/test/helpers/async.ts
@@ -1,5 +1,8 @@
 import { AsyncHook, createHook } from 'async_hooks';
 
+/* eslint-disable-next-line @typescript-eslint/ban-types */
+export type Maybe<TValue> = TValue | null | undefined;
+
 // this will pull Mocha internals out of the stacks
 /* eslint-disable-next-line @typescript-eslint/no-var-requires */
 const { stackTraceFilter } = require('mocha/lib/utils');
@@ -8,7 +11,8 @@ const filterStack = stackTraceFilter();
 type AsyncMochaTest = (this: Mocha.Context | void) => Promise<void>;
 type AsyncMochaSuite = (this: Mocha.Suite) => Promise<void>;
 
-function isNil<T>(val: T | null | undefined): val is null | undefined {
+/* eslint-disable-next-line @typescript-eslint/ban-types */
+function isNil<T>(val: Maybe<T>): val is null | undefined {
   /* eslint-disable-next-line no-null/no-null */
   return val === null || val === undefined;
 }