Fix JS linting errors in Super Cache and remove .eslintignore #40571 (#47979)

Co-authored-by: yaswanth.kumar <yaswanth.kumar@automationanywhere.com>
Co-authored-by: Brandon Kraft <public@brandonkraft.com>

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/24104123495

Upstream-Ref: Automattic/jetpack@ca90ae2

Author: kraftbj

CHANGELOG.md

@@ -25,6 +25,7 @@ This is an alpha version! The changes listed here are not final.
 - Fix a PHP warning when the newest cached pages list is unavailable.
 - Fix TS errors detected by tsgo.
 - Fix `str_starts_with()` PHP 8.1+ deprecation when `$wp_cache_home_path` is null in `get_current_url_supercache_dir()`.
+- Remove `.eslintignore` and fix JS linting errors in `delete-cache-button.js`.
 
 ## [3.0.3] - 2025-11-11
 ### Added

inc/delete-cache-button.js

@@ -1,3 +1,4 @@
+/* global wpsc_ajax */
 ( function ( $ ) {
 	$( document ).ready( function () {
 		$( '#wp-admin-bar-delete-cache' ).on( 'click', function () {
@@ -16,12 +17,17 @@
 					// send the nonce along with the request
 					nonce: wpsc_ajax.nonce,
 				},
-				success: function ( msg ) {
-					wpsc_ajax.admin == 1 && console.log( 'Deleted entire cache' );
-					wpsc_ajax.admin == 0 && console.log( 'Deleted cache for this page and reloading' );
+				success: function () {
+					if ( wpsc_ajax.admin === '1' ) {
+						// eslint-disable-next-line no-console
+						console.log( 'Deleted entire cache' );
+					} else {
+						// eslint-disable-next-line no-console
+						console.log( 'Deleted cache for this page and reloading' );
+					}
 					window.location.reload();
 				},
-				complete: function ( msg ) {
+				complete: function () {
 					$( '#wp-admin-bar-delete-cache' ).fadeIn( 'slow' );
 				},
 			} );