Eslint fixes (denoland/deno_std#356)

Make warnings fail
Original: https://github.com/denoland/deno_std/commit/4543b563a9a01c8c168aafcbfd9d4634effba7fc

3 files changed, 5 insertions, 5 deletions

diff --git a/examples/echo_server.ts b/examples/echo_server.ts
index 95b9f7413..970df4f8d 100644
--- a/examples/echo_server.ts
+++ b/examples/echo_server.ts
@@ -1,7 +1,7 @@
 // Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
 const { listen, copy } = Deno;
 
-(async () => {
+(async (): Promise<void> => {
   const addr = "0.0.0.0:8080";
   const listener = listen("tcp", addr);
   console.log("listening on", addr);
diff --git a/examples/test.ts b/examples/test.ts
index a8f4e3548..17d19a312 100644
--- a/examples/test.ts
+++ b/examples/test.ts
@@ -4,16 +4,16 @@ import { test } from "../testing/mod.ts";
 import { assertEquals } from "../testing/asserts.ts";
 
 /** Example of how to do basic tests */
-test(function t1() {
+test(function t1(): void {
   assertEquals("hello", "hello");
 });
 
-test(function t2() {
+test(function t2(): void {
   assertEquals("world", "world");
 });
 
 /** A more complicated test that runs a subprocess. */
-test(async function catSmoke() {
+test(async function catSmoke(): Promise<void> {
   const p = run({
     args: ["deno", "--allow-read", "examples/cat.ts", "README.md"],
     stdout: "piped"
diff --git a/examples/ws.ts b/examples/ws.ts
index 83e890bc0..f5965b7eb 100644
--- a/examples/ws.ts
+++ b/examples/ws.ts
@@ -10,7 +10,7 @@ async function main(): Promise<void> {
   console.log("websocket server is running on 0.0.0.0:8080");
   for await (const req of serve("0.0.0.0:8080")) {
     if (req.url === "/ws") {
-      (async () => {
+      (async (): Promise<void> => {
         const sock = await acceptWebSocket(req);
         console.log("socket connected!");
         for await (const ev of sock.receive()) {