Build: improve specificity of eslint config; add ecma versions

Closes gh-5501

15 files changed, 141 insertions, 125 deletions

diff --git a/eslint.config.js b/eslint.config.js
index fb70e1a88..d4e57930e 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -15,26 +15,6 @@ export default [
 		]
 	},
 
-	{
-		files: [
-			"eslint.config.js",
-			"Gruntfile.cjs",
-			"test/bundler_smoke_tests/**/*",
-			"test/node_smoke_tests/**",
-			"test/promises_aplus_adapters/**",
-			"test/middleware-mockserver.cjs"
-		],
-		languageOptions: {
-			globals: {
-				...globals.node
-			}
-		},
-		rules: {
-			...jqueryConfig.rules,
-			strict: [ "error", "global" ]
-		}
-	},
-
 	// Source
 	{
 		files: [ "src/**" ],
@@ -42,6 +22,7 @@ export default [
 			import: importPlugin
 		},
 		languageOptions: {
+			ecmaVersion: 2015,
 
 			// The browser env is not enabled on purpose so that code takes
 			// all browser-only globals from window instead of assuming
@@ -84,6 +65,7 @@ export default [
 					outerIIFEBody: 0
 				}
 			],
+			"no-implicit-globals": "error",
 			"one-var": [ "error", { var: "always" } ],
 			strict: [ "error", "function" ]
 		}
@@ -159,7 +141,10 @@ export default [
 	// Tests
 	{
 		files: [
-			"test/**"
+			"test/*",
+			"test/data/**",
+			"test/integration/**",
+			"test/unit/**"
 		],
 		ignores: [
 			"test/data/jquery-3.7.1.js",
@@ -170,11 +155,11 @@ export default [
 			"test/data/core/jquery-iterability-transpiled.js"
 		],
 		languageOptions: {
+			ecmaVersion: 2015,
+			sourceType: "script",
 			globals: {
 				...globals.browser,
 				require: false,
-				Promise: false,
-				Symbol: false,
 				trustedTypes: false,
 				QUnit: false,
 				ajaxTest: false,
@@ -186,32 +171,43 @@ export default [
 				moduleTeardown: false,
 				url: false,
 				q: false,
-				jQuery: true,
-				sinon: true,
-				amdDefined: true,
-				fireNative: true,
-				Globals: true,
-				hasPHP: true,
-				isLocal: true,
-				supportjQuery: true,
-				originaljQuery: true,
-				$: true,
-				original$: true,
-				baseURL: true,
-				externalHost: true
+				jQuery: false,
+				$: false,
+				sinon: false,
+				amdDefined: false,
+				fireNative: false,
+				Globals: false,
+				hasPHP: false,
+				isLocal: false,
+				supportjQuery: false,
+				originaljQuery: false,
+				original$: false,
+				baseURL: false,
+				externalHost: false
 			}
 		},
 		rules: {
 			...jqueryConfig.rules,
-			strict: [ "error", "function" ],
 
-			// See https://github.com/eslint/eslint/issues/2342
-			"no-unused-vars": "off",
+			"no-unused-vars": [
+				"error",
+				{ args: "after-used", argsIgnorePattern: "^_" }
+			],
 
 			// Too many errors
 			"max-len": "off",
-			camelcase: "off",
-			"one-var": "off"
+			camelcase: "off"
+		}
+	},
+
+	{
+		files: [
+			"test/unit/core.js"
+		],
+		rules: {
+
+			// Core has several cases where unused vars are expected
+			"no-unused-vars": "off"
 		}
 	},
 
@@ -220,10 +216,10 @@ export default [
 			"test/runner/**/*.js"
 		],
 		languageOptions: {
+			ecmaVersion: "latest",
 			globals: {
 				...globals.node
-			},
-			sourceType: "module"
+			}
 		},
 		rules: {
 			...jqueryConfig.rules
@@ -234,70 +230,80 @@ export default [
 		files: [ "test/runner/listeners.js" ],
 		languageOptions: {
 			ecmaVersion: 5,
-			sourceType: "script"
+			sourceType: "script",
+			globals: {
+				...globals.browser,
+				QUnit: false,
+				Symbol: false
+			}
 		}
 	},
 
 	{
 		files: [
+			"test/data/testinit.js",
 			"test/data/testrunner.js",
 			"test/data/core/jquery-iterability-transpiled-es6.js"
 		],
 		languageOptions: {
-			sourceType: "script"
+			ecmaVersion: 2015,
+			sourceType: "script",
+			globals: {
+				...globals.browser
+			}
+		},
+		rules: {
+			...jqueryConfig.rules,
+			strict: [ "error", "function" ]
 		}
 	},
 
 	{
 		files: [
-			"test/unit/deferred.js"
+			"test/data/testinit.js"
 		],
 		rules: {
-
-			// Deferred tests set strict mode for certain tests
-			strict: "off"
+			strict: [ "error", "global" ]
 		}
 	},
 
 	{
 		files: [
-			"test/bundler_smoke_tests/**",
-			"test/node_smoke_tests/**",
-			"test/promises_aplus_adapters/**",
-			"test/middleware-mockserver.cjs"
+			"test/unit/deferred.js"
 		],
-		languageOptions: {
-			globals: {
-				...globals.node,
-				...globals.es2021
-			}
-		},
 		rules: {
-			strict: [ "error", "global" ]
+
+			// Deferred tests set strict mode for certain tests
+			strict: "off"
 		}
 	},
 
 	{
 		files: [
 			"build/**",
-			"test/data/testinit.js"
+			"eslint.config.js",
+			"test/node_smoke_tests/**",
+			"test/bundler_smoke_tests/**/*",
+			"test/promises_aplus_adapters/**",
+			"test/middleware-mockserver.cjs"
 		],
 		languageOptions: {
+			ecmaVersion: "latest",
 			globals: {
-				...globals.node,
-				...globals.es2021
+				...globals.browser,
+				...globals.node
 			}
 		},
 		rules: {
 			...jqueryConfig.rules,
+			"no-implicit-globals": "error",
 			strict: [ "error", "global" ]
 		}
 	},
 
 	{
 		files: [
-			"build/**/*.js",
-			"test/data/testinit.js"
+			"build/**/*.js"
 		],
 		languageOptions: {
 			sourceType: "commonjs"
@@ -313,40 +319,26 @@ export default [
 			"dist-module/jquery.module.js",
 			"dist-module/jquery.slim.module.js",
 			"dist-module/jquery.factory.module.js",
-			"dist-module/jquery.factory.slim.module.js"
-		],
-
-		languageOptions: {
-			globals: {
-				...globals.es2021,
-				define: false,
-				module: false,
-				Symbol: false
-			}
-		}
-	},
-
-	{
-		files: [
+			"dist-module/jquery.factory.slim.module.js",
 			"dist/jquery.bundler-require-wrapper.js",
 			"dist/jquery.bundler-require-wrapper.slim.js",
 			"dist-module/jquery.node-module-wrapper.js",
 			"dist-module/jquery.node-module-wrapper.slim.js"
 		],
-
 		languageOptions: {
+			ecmaVersion: 2015,
 			globals: {
-				...globals.node,
-				...globals.es2021,
 				define: false,
 				module: false,
-				Symbol: false
+				Symbol: false,
+				window: false
 			}
 		},
-
 		rules: {
 			...jqueryConfig.rules,
 
+			"no-implicit-globals": "error",
+
 			// That is okay for the built version
 			"no-multiple-empty-lines": "off",
 
@@ -355,5 +347,49 @@ export default [
 			"max-len": "off",
 			"one-var": "off"
 		}
+	},
+
+	{
+		files: [
+			"src/wrapper.js",
+			"src/wrapper-factory.js",
+			"dist/jquery.factory.js",
+			"dist/jquery.factory.slim.js",
+			"test/middleware-mockserver.cjs"
+		],
+		rules: {
+			"no-implicit-globals": "off"
+		}
+	},
+
+	{
+		files: [
+			"dist/**"
+		],
+		languageOptions: {
+			ecmaVersion: 5,
+			sourceType: "script"
+		}
+	},
+
+	{
+		files: [
+			"dist-module/**"
+		],
+		languageOptions: {
+			ecmaVersion: 2015,
+			sourceType: "module"
+		}
+	},
+
+	{
+		files: [
+			"dist/jquery.bundler-require-wrapper.js",
+			"dist/jquery.bundler-require-wrapper.slim.js"
+		],
+		languageOptions: {
+			ecmaVersion: 2015,
+			sourceType: "commonjs"
+		}
 	}
 ];
diff --git a/test/bundler_smoke_tests/run-jsdom-tests.js b/test/bundler_smoke_tests/run-jsdom-tests.js
index ba7100c44..f4eb54806 100644
--- a/test/bundler_smoke_tests/run-jsdom-tests.js
+++ b/test/bundler_smoke_tests/run-jsdom-tests.js
@@ -21,7 +21,7 @@ async function runJSDOMTest( { title, folder } ) {
 
 	const virtualConsole = new jsdom.VirtualConsole();
 	virtualConsole.sendTo( console );
-	virtualConsole.on( "assert", ( success, message ) => {
+	virtualConsole.on( "assert", ( success ) => {
 		if ( !success ) {
 			process.exitCode = 1;
 		}
diff --git a/test/data/csp-nonce-external.js b/test/data/csp-nonce-external.js
index efedd5a9a..27132b3fb 100644
--- a/test/data/csp-nonce-external.js
+++ b/test/data/csp-nonce-external.js
@@ -1,5 +1,3 @@
-/* global startIframeTest */
-
 jQuery( function() {
 	$( "body" ).append( "<script nonce='jquery+hardcoded+nonce' src='csp-nonce.js'></script>" );
 } );
diff --git a/test/data/csp-nonce-globaleval.js b/test/data/csp-nonce-globaleval.js
index 23d549fd6..8c6cb6346 100644
--- a/test/data/csp-nonce-globaleval.js
+++ b/test/data/csp-nonce-globaleval.js
@@ -1,5 +1,3 @@
-/* global startIframeTest */
-
 jQuery( function() {
 	$.globalEval( "startIframeTest()", { nonce: "jquery+hardcoded+nonce" } );
 } );
diff --git a/test/data/csp-nonce.js b/test/data/csp-nonce.js
index 507e87e68..547891df5 100644
--- a/test/data/csp-nonce.js
+++ b/test/data/csp-nonce.js
@@ -1,5 +1,3 @@
-/* global startIframeTest */
-
 jQuery( function() {
 	var script = document.createElement( "script" );
 	script.setAttribute( "nonce", "jquery+hardcoded+nonce" );
diff --git a/test/jquery.js b/test/jquery.js
index a8a800d24..cd9c490b1 100644
--- a/test/jquery.js
+++ b/test/jquery.js
@@ -1,7 +1,5 @@
 // Use the right jQuery source on the test page (and iframes)
 ( function() {
-	/* global loadTests: false */
-
 	var dynamicImportSource, config, src,
 		parentUrl = window.location.protocol + "//" + window.location.host,
 		QUnit = window.QUnit;
diff --git a/test/unit/attributes.js b/test/unit/attributes.js
index 477f3464a..b02e99e87 100644
--- a/test/unit/attributes.js
+++ b/test/unit/attributes.js
@@ -261,7 +261,7 @@ QUnit.test( "attr(String, Object)", function( assert ) {
 
 	var $input, $text, $details,
 		attributeNode, commentNode, textNode, obj,
-		table, td, j, type,
+		table, td, j,
 		check, thrown, button, $radio, $radios, $svg,
 		div = jQuery( "#qunit-fixture div" ).attr( "foo", "bar" ),
 		i = 0,
@@ -418,7 +418,6 @@ QUnit.test( "attr(String, Object)", function( assert ) {
 	j.removeAttr( "name" );
 
 	// Type
-	type = jQuery( "#check2" ).attr( "type" );
 	try {
 		jQuery( "#check2" ).attr( "type", "hidden" );
 		assert.ok( true, "No exception thrown on input type change" );
diff --git a/test/unit/css.js b/test/unit/css.js
index a8b7d8e89..d872e52bb 100644
--- a/test/unit/css.js
+++ b/test/unit/css.js
@@ -7,7 +7,7 @@ QUnit.test( "css(String|Hash)", function( assert ) {
 
 	assert.equal( jQuery( "#qunit-fixture" ).css( "display" ), "block", "Check for css property \"display\"" );
 
-	var $child, div, div2, width, height, child, prctval, checkval, old;
+	var $child, div, div2, child, prctval, checkval, old;
 
 	$child = jQuery( "#nothiddendivchild" ).css( { "width": "20%", "height": "20%" } );
 	assert.notEqual( $child.css( "width" ), "20px", "Retrieving a width percentage on the child of a hidden div returns percentage" );
@@ -36,8 +36,6 @@ QUnit.test( "css(String|Hash)", function( assert ) {
 	// handle negative numbers by setting to zero trac-11604
 	jQuery( "#nothiddendiv" ).css( { "width": 1, "height": 1 } );
 
-	width = parseFloat( jQuery( "#nothiddendiv" ).css( "width" ) );
-	height = parseFloat( jQuery( "#nothiddendiv" ).css( "height" ) );
 	jQuery( "#nothiddendiv" ).css( { "overflow": "hidden", "width": -1, "height": -1 } );
 	assert.equal( parseFloat( jQuery( "#nothiddendiv" ).css( "width" ) ), 0, "Test negative width set to 0" );
 	assert.equal( parseFloat( jQuery( "#nothiddendiv" ).css( "height" ) ), 0, "Test negative height set to 0" );
@@ -274,8 +272,7 @@ QUnit.test( "css() non-px relative values (gh-1711)", function( assert ) {
 QUnit.test( "css() mismatched relative values with bounded styles (gh-2144)", function( assert ) {
 	assert.expect( 1 );
 
-	var right,
-		$container = jQuery( "<div></div>" )
+	var $container = jQuery( "<div></div>" )
 			.css( { position: "absolute", width: "400px", fontSize: "4px" } )
 			.appendTo( "#qunit-fixture" ),
 		$el = jQuery( "<div></div>" )
diff --git a/test/unit/data.js b/test/unit/data.js
index 98973c6ed..d4a0f7b12 100644
--- a/test/unit/data.js
+++ b/test/unit/data.js
@@ -317,6 +317,7 @@ QUnit.test( "data-* attributes", function( assert ) {
 
 	assert.equal( num, check.length, "Make sure that the right number of properties came through." );
 
+	/* eslint-disable-next-line no-unused-vars */
 	for ( prop in obj2 ) {
 		num2++;
 	}
diff --git a/test/unit/deferred.js b/test/unit/deferred.js
index 45c94fd1d..1ff0e5618 100644
--- a/test/unit/deferred.js
+++ b/test/unit/deferred.js
@@ -823,11 +823,11 @@ QUnit.test( "jQuery.when(nonThenable) - like Promise.resolve", function( assert
 		done = assert.async( 20 );
 
 	jQuery.when()
-		.done( function( resolveValue ) {
+		.done( function() {
 			assert.strictEqual( arguments.length, 0, "Resolved .done with no arguments" );
 			assert.strictEqual( this, defaultContext, "Default .done context with no arguments" );
 		} )
-		.then( function( resolveValue ) {
+		.then( function() {
 			assert.strictEqual( arguments.length, 0, "Resolved .then with no arguments" );
 			assert.strictEqual( this, defaultContext, "Default .then context with no arguments" );
 		} );
diff --git a/test/unit/effects.js b/test/unit/effects.js
index 8f6492124..2ba9ee686 100644
--- a/test/unit/effects.js
+++ b/test/unit/effects.js
@@ -1138,18 +1138,13 @@ QUnit.test( "interrupt toggle", function( assert ) {
 
 	var longDuration = fxInterval * 200,
 		shortDuration = fxInterval * 50,
-		remaining = 0,
 		$elems = jQuery( ".chain-test" ),
 		clock = this.clock,
-		finish = function() {
-		};
+		finish = function() {};
 
 	jQuery.each( { slideToggle: "height", fadeToggle: "opacity", toggle: "width" }, function( method, prop ) {
 		var $methodElems = $elems.filter( "[id^='" + method.toLowerCase() + "']" ).each( function() {
 
-			// Don't end test until we're done with this element
-			remaining++;
-
 			// Save original property value for comparison
 			jQuery.data( this, "startVal", jQuery( this ).css( prop ) );
 		} );
diff --git a/test/unit/event.js b/test/unit/event.js
index 111b1a18b..89d48c420 100644
--- a/test/unit/event.js
+++ b/test/unit/event.js
@@ -2698,7 +2698,6 @@ testIframe(
 		assert.expect( 1 );
 
 		var done = assert.async(),
-			focus = false,
 			input = jQuery( frameDoc ).find( "#frame-input" );
 
 		// Create a focusin handler on the parent; shouldn't affect the iframe's fate
@@ -3113,11 +3112,11 @@ QUnit.test(
 				spy.immediate = sinon.stub( event.originalEvent, "stopImmediatePropagation" );
 				event.stopImmediatePropagation();
 			} )
-			.on( "simulated", function( event ) {
+			.on( "simulated", function() {
 				assert.ok( false, "simulated event immediate propagation stopped" );
 			} );
 		outer
-			.on( "simulated", function( event ) {
+			.on( "simulated", function() {
 				assert.ok( false, "simulated event propagation stopped" );
 			} );
 
@@ -3180,8 +3179,7 @@ QUnit.test( "trigger('click') on radio passes extra params", function( assert )
 QUnit.test( "focusout/focusin support", function( assert ) {
 	assert.expect( 6 );
 
-	var focus,
-		parent = jQuery( "<div>" ),
+	var parent = jQuery( "<div>" ),
 		input = jQuery( "<input>" ),
 		inputExternal = jQuery( "<input>" );
 
diff --git a/test/unit/manipulation.js b/test/unit/manipulation.js
index a3ac18eef..b91d72b29 100644
--- a/test/unit/manipulation.js
+++ b/test/unit/manipulation.js
@@ -1329,7 +1329,7 @@ QUnit.test( "Empty replaceWith (trac-13401; trac-13596; gh-2204)", function( ass
 			return input;
 		} );
 		assert.strictEqual( $el.html(), "", "replaceWith(function returning " + label + ")" );
-		$el.html( "<i></i>" ).children().replaceWith( function( i ) {
+		$el.html( "<i></i>" ).children().replaceWith( function() {
 			return input;
 		} );
 		assert.strictEqual( $el.html(), "", "replaceWith(other function returning " + label + ")" );
@@ -2661,8 +2661,6 @@ QUnit.test( "insertAfter, insertBefore, etc do not work when destination is orig
 
 	assert.expect( 10 );
 
-	var elems;
-
 	jQuery.each( [
 		"appendTo",
 		"prependTo",
@@ -2670,7 +2668,7 @@ QUnit.test( "insertAfter, insertBefore, etc do not work when destination is orig
 		"insertAfter",
 		"replaceAll"
 	], function( index, name ) {
-		elems = jQuery( [
+		jQuery( [
 			"<ul id='test4087-complex'><li class='test4087'><div>c1</div>h1</li><li><div>c2</div>h2</li></ul>",
 			"<div id='test4087-simple'><div class='test4087-1'>1<div class='test4087-2'>2</div><div class='test4087-3'>3</div></div></div>",
 			"<div id='test4087-multiple'><div class='test4087-multiple'>1</div><div class='test4087-multiple'>2</div></div>"
@@ -2955,7 +2953,7 @@ QUnit.test( "Ignore content from unsuccessful responses (gh-4126)", function( as
 	assert.expect( 1 );
 
 	var globalEval = jQuery.globalEval;
-	jQuery.globalEval = function( code ) {
+	jQuery.globalEval = function( _code ) {
 		assert.ok( false, "no attempt to evaluate code from an unsuccessful response" );
 	};
 
@@ -2973,7 +2971,7 @@ QUnit.test( "Ignore content from unsuccessful responses (gh-4126)", function( as
 testIframe(
 	"Check if CSP nonce is preserved",
 	"mock.php?action=cspNonce",
-	function( assert, jQuery, window, document ) {
+	function( assert ) {
 		var done = assert.async();
 
 		assert.expect( 1 );
@@ -2988,7 +2986,7 @@ testIframe(
 testIframe(
 	"Check if CSP nonce is preserved for external scripts with src attribute",
 	"mock.php?action=cspNonce&test=external",
-	function( assert, jQuery, window, document ) {
+	function( assert ) {
 		var done = assert.async();
 
 		assert.expect( 1 );
@@ -3006,7 +3004,7 @@ testIframe(
 testIframe(
 	"jQuery.globalEval supports nonce",
 	"mock.php?action=cspNonce&test=globaleval",
-	function( assert, jQuery, window, document ) {
+	function( assert ) {
 		var done = assert.async();
 
 		assert.expect( 1 );
diff --git a/test/unit/offset.js b/test/unit/offset.js
index 50eee3dd5..a62ebde5b 100644
--- a/test/unit/offset.js
+++ b/test/unit/offset.js
@@ -4,7 +4,7 @@ if ( !includesModule( "offset" ) ) {
 	return;
 }
 
-var supportsScroll, alwaysScrollable,
+var alwaysScrollable,
 	forceScroll = supportjQuery( "<div></div>" ).css( { width: 2000, height: 2000 } ),
 	checkSupport = function( assert ) {
 
@@ -14,7 +14,7 @@ var supportsScroll, alwaysScrollable,
 		// Append forceScroll to the body instead of #qunit-fixture because the latter is hidden
 		forceScroll.appendTo( "body" );
 		window.scrollTo( 200, 200 );
-		supportsScroll = document.documentElement.scrollTop || document.body.scrollTop;
+		window.supportsScroll = document.documentElement.scrollTop || document.body.scrollTop;
 		forceScroll.detach();
 
 		// Support: iOS <=7 - 12+
diff --git a/test/unit/traversing.js b/test/unit/traversing.js
index acc9c732d..d3f69db81 100644
--- a/test/unit/traversing.js
+++ b/test/unit/traversing.js
@@ -857,7 +857,7 @@ QUnit.testUnlessIE( "contents() for <template /> remains inert", function( asser
 		"</template>"
 	);
 
-	var content = jQuery( "#template" ).contents();
+	jQuery( "#template" ).contents();
 
 	assert.strictEqual( window.testScript, true, "script in template isn't executed" );
 	assert.strictEqual( window.testImgOnload, true, "onload of image in template isn't executed" );