fix(lint): selectively allow null types

src/source.ts

@@ -42,6 +42,7 @@ export async function writeSource(path: string, data: string, stream = process.s
 
 export function writeStream(stream: NodeJS.WriteStream, data: string): Promise<void> {
   return new Promise((res, rej) => {
+    /* eslint-disable-next-line @typescript-eslint/ban-types */
     stream.write(data, (err: Error | null | undefined) => {
       if (isNil(err)) {
         res();

src/utils/index.ts

@@ -1,5 +1,7 @@
 import { isNil } from 'lodash';
 
+/* eslint-disable @typescript-eslint/ban-types */
+
 export function doesExist<T>(val: T | null | undefined): val is T {
   return !isNil(val);
 }

test/helpers/async.ts

@@ -8,6 +8,7 @@ const filterStack = stackTraceFilter();
 type AsyncMochaTest = (this: Mocha.Context | void) => Promise<void>;
 type AsyncMochaSuite = (this: Mocha.Suite) => Promise<void>;
 
+/* eslint-disable-next-line @typescript-eslint/ban-types */
 function isNil<T>(val: T | null | undefined): val is null | undefined {
   /* eslint-disable-next-line no-null/no-null */
   return val === null || val === undefined;