feat(cli): update to TypeScript 4.1 (#7573)

1 files changed, 2 insertions, 2 deletions

diff --git a/cli/tests/workers_test.ts b/cli/tests/workers_test.ts
index 7cff6848b..c74680c27 100644
--- a/cli/tests/workers_test.ts
+++ b/cli/tests/workers_test.ts
@@ -10,14 +10,14 @@
 import { assert, assertEquals } from "../../std/testing/asserts.ts";
 
 export interface ResolvableMethods<T> {
-  resolve: (value?: T | PromiseLike<T>) => void;
+  resolve: (value: T | PromiseLike<T>) => void;
   // deno-lint-ignore no-explicit-any
   reject: (reason?: any) => void;
 }
 
 export type Resolvable<T> = Promise<T> & ResolvableMethods<T>;
 
-export function createResolvable<T>(): Resolvable<T> {
+export function createResolvable<T = void>(): Resolvable<T> {
   let methods: ResolvableMethods<T>;
   const promise = new Promise<T>((resolve, reject): void => {
     methods = { resolve, reject };