fix eslint

fs/write_file_str.ts

@@ -5,6 +5,7 @@
  *
  * @param filename File to write
  * @param content The content write to file
+ * @returns void
  */
 export function writeFileStrSync(filename: string, content: string): void {
   const encoder = new TextEncoder();
@@ -16,6 +17,7 @@ export function writeFileStrSync(filename: string, content: string): void {
  *
  * @param filename File to write
  * @param content The content write to file
+ * @returns Promise<void>
  */
 export async function writeFileStr(
   filename: string,

fs/write_file_str_test.ts

@@ -1,5 +1,5 @@
 import { test } from "../testing/mod.ts";
-import { assert, assertEquals } from "../testing/asserts.ts";
+import { assertEquals } from "../testing/asserts.ts";
 import { writeFileStr, writeFileStrSync } from "./write_file_str.ts";
 import * as path from "./path/mod.ts";