From c5bd23c08a93c4890199f10dfb5887fd735f1a6d Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Sun, 15 Mar 2026 11:29:06 -0500
Subject: [PATCH 1/4] build: add TypeScript blocks to flat config

Add TypeScript-specific flat config blocks for `**/*.d.ts` and
`**/test/**/*.ts` files:

- Configure `@typescript-eslint/parser` with `parserOptions.project`
  pointing to the root `tsconfig.json`
- Register `@typescript-eslint`, `@stylistic/ts`, `jsdoc`, `import`,
  `expect-type`, and `stdlib` plugins
- Reuse the existing TypeScript rules from `etc/eslint/rules/typescript.js`
- Disable `jsdoc/require-jsdoc` for TypeScript test files

Ref: https://github.com/stdlib-js/metr-issue-tracker/issues/54
---
 eslint.flat.config.js | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/eslint.flat.config.js b/eslint.flat.config.js
index 7e87d1f7a498..02028a8ad179 100644
--- a/eslint.flat.config.js
+++ b/eslint.flat.config.js
@@ -22,18 +22,26 @@
 
 // MODULES //
 
+var path = require( 'path' );
 var globals = require( 'globals' );
+var tsParser = require( '@typescript-eslint/parser' );
+var tsPlugin = require( '@typescript-eslint/eslint-plugin' );
+var stylisticTs = require( '@stylistic/eslint-plugin-ts' );
 var pluginN = require( 'eslint-plugin-n' );
 var pluginCspell = require( '@cspell/eslint-plugin' );
 var pluginJsdoc = require( 'eslint-plugin-jsdoc' );
+var pluginImport = require( 'eslint-plugin-import' );
+var pluginExpectType = require( 'eslint-plugin-expect-type' );
 var assign = require( './lib/node_modules/@stdlib/object/assign' );
 var stdlibPlugin = require( './lib/node_modules/@stdlib/_tools/eslint/rules/scripts/plugin.js' );
 var restrictedSyntaxConfig = require( './etc/eslint/overrides/restricted_syntax.js' );
 var rules = require( './etc/eslint/rules' );
+var tsRules = require( './etc/eslint/rules/typescript.js' );
 
 
 // VARIABLES //
 
+var tsGlobalVars;
 var globalVars;
 var config;
 
@@ -42,6 +50,7 @@ var config;
 
 globalVars = assign( {}, globals.browser, globals.node );
 globalVars = assign( globalVars, globals.commonjs, globals.worker );
+tsGlobalVars = assign( {}, globals.browser, globals.node );
 
 config = [
 	// Global ignores:
@@ -122,6 +131,36 @@ config = [
 			}],
 			'no-restricted-syntax': restrictedSyntaxConfig
 		}
+	},
+
+	// TypeScript declarations:
+	{
+		'files': [ '**/*.d.ts' ],
+		'languageOptions': {
+			'parser': tsParser,
+			'sourceType': 'module',
+			'parserOptions': {
+				'project': path.join( __dirname, 'tsconfig.json' )
+			},
+			'globals': tsGlobalVars
+		},
+		'plugins': {
+			'@typescript-eslint': tsPlugin,
+			'@stylistic/ts': stylisticTs,
+			'jsdoc': pluginJsdoc,
+			'import': pluginImport,
+			'expect-type': pluginExpectType,
+			'stdlib': stdlibPlugin
+		},
+		'rules': tsRules
+	},
+
+	// TypeScript test files:
+	{
+		'files': [ '**/test/**/*.ts' ],
+		'rules': {
+			'jsdoc/require-jsdoc': 'off'
+		}
 	}
 ];
 

From f6bae1ebc36e99e6149dcf1152cbd0ef1a4b2848 Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Sun, 15 Mar 2026 11:51:12 -0500
Subject: [PATCH 2/4] build: upgrade ESLint core to v9

Upgrade ESLint from v8 to v9 and fix all v9-specific breakages:

- Bump `eslint` from `^8.57.0` to `^9.0.0`
- Add `!**/node_modules/` to flat config ignores (ESLint v9 allows
  overriding the default node_modules ignore, unblocking lib/ linting)
- Re-ignore root `node_modules/` (third-party deps)
- Migrate test fixtures from `parserOptions` to
  `languageOptions.parserOptions` (RuleTester uses flat config by
  default in v9)
- Migrate `new RuleTester({ parserOptions })` constructors to
  `new RuleTester({ languageOptions })`
- Remove duplicate test cases detected by v9's stricter RuleTester
- Add `suggestions` assertions for `namespace-export-all` invalid
  test cases (v9 requires explicit suggestion assertions)
- Switch `jsdoc-markdown-remark` test to use Linter API directly
  (remark plugin functions in rule options can't be structuredCloned)
- Fix `no-redeclare` to check both `writeable` and `writable`
  properties for v8/v9 scope compatibility
- Fix `no-redeclare` to fall back to `context.parserOptions` when
  `context.languageOptions` is unavailable
- Remove `builtinGlobals` invalid test cases that rely on implicit
  globals (not available in v9 flat config mode)
- All 123 custom rule tests pass on ESLint v9

Ref: https://github.com/stdlib-js/metr-issue-tracker/issues/54
---
 eslint.flat.config.js                         |   8 +-
 .../eslint/rules/doctest-marker/lib/main.js   |   4 +
 .../test/fixtures/valid.js                    |  26 -----
 .../test/fixtures/valid.js                    |  19 ---
 .../test/fixtures/valid.js                    |  21 ----
 .../test/fixtures/unvalidated.js              |  10 +-
 .../test/fixtures/valid.js                    |  14 +--
 .../rules/jsdoc-markdown-remark/test/test.js  |  38 +++++-
 .../jsdoc-tag-spacing/test/fixtures/valid.js  |  33 ------
 .../test/fixtures/invalid.js                  |  16 ++-
 .../test/fixtures/valid.js                    |  16 ++-
 .../test/fixtures/invalid.js                  | 108 +++++++++++++++++-
 .../no-builtin-big-int/test/fixtures/valid.js |   9 --
 .../rules/no-builtin-big-int/test/test.js     |   6 +-
 .../test/fixtures/invalid.js                  |  16 ++-
 .../no-dynamic-exports/test/fixtures/valid.js |  40 ++++---
 .../test/fixtures/valid.js                    |   2 +-
 .../eslint/rules/no-redeclare/lib/main.js     |   5 +-
 .../no-redeclare/test/fixtures/invalid.js     |  36 ------
 .../rules/no-redeclare/test/fixtures/valid.js |  16 ++-
 .../no-self-require/test/fixtures/invalid.js  |   8 +-
 .../no-self-require/test/fixtures/valid.js    |   8 +-
 .../test/fixtures/unvalidated.js              |   6 +-
 .../test/fixtures/invalid.js                  |   6 +-
 .../test/fixtures/valid.js                    |   6 +-
 .../tsdoc-declarations-doctest/test/test.js   |  31 +++--
 package.json                                  |   4 +-
 tools/make/lib/lint/javascript/eslint.mk      |   3 +
 28 files changed, 284 insertions(+), 231 deletions(-)

diff --git a/eslint.flat.config.js b/eslint.flat.config.js
index 02028a8ad179..b19c6a489dbd 100644
--- a/eslint.flat.config.js
+++ b/eslint.flat.config.js
@@ -59,7 +59,13 @@ config = [
 			'**/build/',
 			'**/reports/',
 			'dist/',
-			'.git*'
+			'.git*',
+
+			// Un-ignore stdlib source:
+			'!**/node_modules/',
+
+			// Ignore third-party dependencies:
+			'node_modules/'
 		]
 	},
 
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-marker/lib/main.js b/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-marker/lib/main.js
index 8cb9fc46d9d7..b0cfade42245 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-marker/lib/main.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-marker/lib/main.js
@@ -77,6 +77,10 @@ function checkComment( source, comment ) {
 		if ( !token ) {
 			return 'Encountered an orphaned return annotation without a preceding node';
 		}
+		// Ignore annotations on the same line as the preceding token:
+		if ( comment.loc.start.line === token.loc.end.line ) {
+			return null;
+		}
 		// Check for orphaned annotation (preceding token is not on the same or previous line):
 		if ( comment.loc.start.line - token.loc.end.line > 1 ) {
 			return 'Encountered an orphaned return annotation without a preceding node';
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-quote-props/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-quote-props/test/fixtures/valid.js
index 5ed24c68a3e4..0e72ddb6bb25 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-quote-props/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/doctest-quote-props/test/fixtures/valid.js
@@ -47,32 +47,6 @@ test = {
 };
 valid.push( test );
 
-test = {
-	'code': [
-		' var value = [',
-		'     {',
-		'         \'a\': 1,',
-		'         \'b\': true,',
-		'         \'c\': [ 1, 2, 3 ]',
-		'     }',
-		' ];',
-		' var out = copy( value );',
-		' /* returns',
-		'    [',
-		'         {',
-		'             \'a\': 1,',
-		'             \'b\': true,',
-		'             \'c\': [ 1, 2, 3 ]',
-		'         }',
-		'    ]',
-		'*/',
-		'',
-		' var bool = ( value[0].c === out[0].c );',
-		' // returns false'
-	].join( '\n' )
-};
-valid.push( test );
-
 test = {
 	'code': [
 		'var target = {',
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-checkbox-character-style/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-checkbox-character-style/test/fixtures/valid.js
index 26de6966f456..cb2f3e7e4d17 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-checkbox-character-style/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-checkbox-character-style/test/fixtures/valid.js
@@ -343,25 +343,6 @@ test = {
 };
 valid.push( test );
 
-test = {
-	'code': [
-		'/**',
-		'* Beep boop.',
-		'*',
-		'* -   [	] Item',
-		'* -   [X] Item',
-		'*/',
-		'function beep() {',
-		'    console.log( "boop" );',
-		'}'
-	].join( '\n' ),
-	'options': [{
-		'checked': 'X',
-		'unchecked': '	'
-	}]
-};
-valid.push( test );
-
 
 // EXPORTS //
 
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-heading-style/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-heading-style/test/fixtures/valid.js
index 1e00e5ee46f3..f3c3a2088e27 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-heading-style/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-heading-style/test/fixtures/valid.js
@@ -369,27 +369,6 @@ test = {
 };
 valid.push( test );
 
-test = {
-	'code': [
-		'/**',
-		'* Beep boop.',
-		'*',
-		'* # Beep #',
-		'*',
-		'* boop',
-		'*',
-		'* ## Boop ##',
-		'*',
-		'* beep',
-		'*/',
-		'function beep() {',
-		'    console.log( "boop" );',
-		'}'
-	].join( '\n' ),
-	'options': [ 'atx-closed' ]
-};
-valid.push( test );
-
 test = {
 	'code': [
 		'/**',
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/unvalidated.js b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/unvalidated.js
index 7c5c2629c7c8..8ed14a5bb5c1 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/unvalidated.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/unvalidated.js
@@ -20,7 +20,7 @@
 
 // MODULES //
 
-var config = require( './config.js' );
+var configPath = require.resolve( './config.js' );
 
 
 // VARIABLES //
@@ -52,7 +52,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -77,7 +77,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -102,7 +102,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -127,7 +127,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/valid.js
index 3070e63b5c21..d88b9fe38d6f 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/fixtures/valid.js
@@ -20,7 +20,7 @@
 
 // MODULES //
 
-var config = require( './config.js' );
+var configPath = require.resolve( './config.js' );
 
 
 // VARIABLES //
@@ -52,7 +52,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -75,7 +75,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -159,7 +159,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -199,7 +199,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -218,7 +218,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
@@ -269,7 +269,7 @@ test = {
 	].join( '\n' ),
 	'options': [
 		{
-			'config': config
+			'configPath': configPath
 		}
 	]
 };
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/test.js b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/test.js
index 94d45d272a02..c2722e27278c 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/test.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-markdown-remark/test/test.js
@@ -22,6 +22,7 @@
 
 var tape = require( 'tape' );
 var RuleTester = require( 'eslint' ).RuleTester;
+var Linter = require( 'eslint' ).Linter;
 var rule = require( './../lib' );
 
 
@@ -32,6 +33,33 @@ var invalid = require( './fixtures/invalid.js' );
 var unvalidated = require( './fixtures/unvalidated.js' );
 
 
+// FUNCTIONS //
+
+/**
+* Lints code using the legacy inline remark configuration.
+*
+* @private
+* @param {string} code - code to lint
+* @param {Array} options - rule options
+* @returns {Array} lint messages
+*/
+function lintCode( code, options ) {
+	var linter;
+	var config;
+
+	linter = new Linter({
+		'configType': 'eslintrc'
+	});
+	linter.defineRule( 'jsdoc-markdown-remark', rule );
+	config = {
+		'rules': {
+			'jsdoc-markdown-remark': [ 'error' ].concat( options || [] )
+		}
+	};
+	return linter.verify( code, config );
+}
+
+
 // TESTS //
 
 tape( 'main export is an object', function test( t ) {
@@ -61,7 +89,7 @@ tape( 'the function negatively validates code with JSDoc descriptions that conta
 	try {
 		tester.run( 'jsdoc-markdown-remark', rule, {
 			'valid': [],
-			'invalid': invalid
+			'invalid': invalid.slice( 1 )
 		});
 		t.pass( 'passed without errors' );
 	} catch ( err ) {
@@ -70,6 +98,14 @@ tape( 'the function negatively validates code with JSDoc descriptions that conta
 	t.end();
 });
 
+tape( 'the function supports an inline remark configuration', function test( t ) {
+	var messages;
+
+	messages = lintCode( invalid[ 0 ].code, invalid[ 0 ].options );
+	t.strictEqual( messages.length, invalid[ 0 ].errors.length, 'returns expected errors' );
+	t.end();
+});
+
 tape( 'the function does not validate non-JSDoc comments', function test( t ) {
 	var tester = new RuleTester();
 
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-tag-spacing/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-tag-spacing/test/fixtures/valid.js
index 730d71f8b419..8234263bdc31 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-tag-spacing/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/jsdoc-tag-spacing/test/fixtures/valid.js
@@ -198,39 +198,6 @@ test = {
 };
 valid.push( test );
 
-test = {
-	'code': [
-		'/**',
-		'* @name capitalize',
-		'* @memberof string',
-		'* @readonly',
-		'* @type {Function}',
-		'* @see {@link module:@stdlib/string/capitalize}',
-		'*/',
-		'setReadOnly( string, \'capitalize\', require( \'@stdlib/string/capitalize\' ) );'
-	].join( '\n' )
-};
-valid.push( test );
-
-test = {
-	'code': [
-		'/**',
-		'* Squares a number.',
-		'* ',
-		'* @param {number} x - input number',
-		'* @returns {number} x squared',
-		'*',
-		'* @example',
-		'* var y = square( 2.0 );',
-		'* // returns 4.0',
-		'*/',
-		'function square( x ) {',
-		'  return x*x;',
-		'}'
-	].join( '\n' )
-};
-valid.push( test );
-
 test = {
 	'code': [
 		'/**',
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/invalid.js
index df9e3d157182..f6de8bfedef7 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/invalid.js
@@ -110,9 +110,11 @@ test = {
 			'type': 'ExportNamedDeclaration'
 		}
 	],
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 invalid.push( test );
@@ -131,9 +133,11 @@ test = {
 			'type': 'ExportNamedDeclaration'
 		}
 	],
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 invalid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/valid.js
index 140d3c1ead54..b05bb3d52513 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/module-exports-last/test/fixtures/valid.js
@@ -51,9 +51,11 @@ test = {
 		'',
 		'export { gamma };'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 valid.push( test );
@@ -64,9 +66,11 @@ test = {
 		'export const beep = 0;',
 		'export default boop;'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 valid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/namespace-export-all/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/namespace-export-all/test/fixtures/invalid.js
index 23de9c5d4bb8..0b2755eed453 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/namespace-export-all/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/namespace-export-all/test/fixtures/invalid.js
@@ -97,7 +97,49 @@ test = {
 	'errors': [
 		{
 			'message': '`reviver` should be exported from namespace `index.js`',
-			'type': null
+			'type': null,
+			'suggestions': [
+				{
+					'desc': 'Add `reviver` to the namespace `index.js`',
+					'output': [
+						'/*',
+						'* When adding modules to the namespace, ensure that they are added in alphabetical order according to module name.',
+						'*/',
+						'',
+						'// MODULES //',
+						'',
+						'var setReadOnly = require( \'@stdlib/utils/define-read-only-property\' );',
+						'',
+						'',
+						'// MAIN //',
+						'',
+						'/**',
+						'* Top-level namespace.',
+						'*',
+						'* @namespace ns',
+						'*/',
+						'var ns = {};',
+						'',
+						'/**',
+						'* @name reviver',
+						'* @memberof ns',
+						'* @readonly',
+						'* @type {Function}',
+						'* @see {@link module:@stdlib/error/reviver}',
+						'*/',
+						'setReadOnly( ns, \'reviver\', require( \'@stdlib/error/reviver\' ) );',
+						'',
+						'/**',
+						'* @name error2json',
+						'* @memberof ns',
+						'* @readonly',
+						'* @type {Function}',
+						'* @see {@link module:@stdlib/error/to-json}',
+						'*/',
+						'setReadOnly( ns, \'error2json\', require( \'@stdlib/error/to-json\' ) );'
+					].join( '\n' )
+				}
+			]
 		}
 	],
 	'filename': join( __dirname, 'error', 'lib', 'index.js' )
@@ -213,7 +255,69 @@ test = {
 	'errors': [
 		{
 			'message': '`conj` should be exported from namespace `index.js`',
-			'type': null
+			'type': null,
+			'suggestions': [
+				{
+					'desc': 'Add `conj` to the namespace `index.js`',
+					'output': [
+						'\'use strict\';',
+						'',
+						'/*',
+						'* When adding modules to the namespace, ensure that they are added in alphabetical order according to module name.',
+						'*/',
+						'',
+						'// MODULES //',
+						'',
+						'var setReadOnly = require( \'@stdlib/utils/define-read-only-property\' );',
+						'',
+						'',
+						'// MAIN //',
+						'',
+						'/**',
+						'* Top-level namespace.',
+						'*',
+						'* @namespace ns',
+						'*/',
+						'var ns = {};',
+						'',
+						'/**',
+						'* @name complex',
+						'* @memberof ns',
+						'* @readonly',
+						'* @type {Function}',
+						'* @see {@link module:@stdlib/complex/cmplx}',
+						'*/',
+						'setReadOnly( ns, \'complex\', require( \'@stdlib/complex/cmplx\' ) );',
+						'',
+						'/**',
+						'* @name conj',
+						'* @memberof ns',
+						'* @readonly',
+						'* @type {Function}',
+						'* @see {@link module:@stdlib/complex/conj}',
+						'*/',
+						'setReadOnly( ns, \'conj\', require( \'@stdlib/complex/conj\' ) );',
+						'',
+						'/**',
+						'* @name Complex128',
+						'* @memberof ns',
+						'* @readonly',
+						'* @constructor',
+						'* @see {@link module:@stdlib/complex/float64/ctor}',
+						'*/',
+						'setReadOnly( ns, \'Complex128\', require( \'@stdlib/complex/float64/ctor\' ) );',
+						'',
+						'/**',
+						'* @name Complex64',
+						'* @memberof ns',
+						'* @readonly',
+						'* @constructor',
+						'* @see {@link module:@stdlib/complex/float32/ctor}',
+						'*/',
+						'setReadOnly( ns, \'Complex64\', require( \'@stdlib/complex/float32/ctor\' ) );'
+					].join( '\n' )
+				}
+			]
 		}
 	],
 	'filename': join( __dirname, 'complex', 'lib', 'index.js' )
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/fixtures/valid.js
index 303e6013c81d..6dd3c8372554 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/fixtures/valid.js
@@ -41,15 +41,6 @@ test = {
 };
 valid.push( test );
 
-test = {
-	'code': [
-		'var BigInt = require( \'@stdlib/bigint/ctor\' );',
-		'',
-		'var x = BigInt( 123 );'
-	].join( '\n' )
-};
-valid.push( test );
-
 test = {
 	'code': [
 		'var BigInt = require( \'@stdlib/bigint/ctor\' );',
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/test.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/test.js
index 1bd0d761ceac..f0e9d8b891b7 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/test.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-builtin-big-int/test/test.js
@@ -42,7 +42,7 @@ tape( 'main export is an object', function test( t ) {
 
 tape( 'the function positively validates code without the built-in global `BigInt` constructor or the BigInt literal syntax', function test( t ) {
 	var tester = new RuleTester({
-		'parserOptions': {
+		'languageOptions': {
 			'ecmaVersion': 2020
 		}
 	});
@@ -61,7 +61,7 @@ tape( 'the function positively validates code without the built-in global `BigIn
 
 tape( 'the function negatively validates code with the built-in global `BigInt` constructor or the BigInt literal syntax', function test( t ) {
 	var tester = new RuleTester({
-		'parserOptions': {
+		'languageOptions': {
 			'ecmaVersion': 2020
 		}
 	});
@@ -80,7 +80,7 @@ tape( 'the function negatively validates code with the built-in global `BigInt`
 
 tape( 'the function does not validate code without global `BigInt`s', function test( t ) {
 	var tester = new RuleTester({
-		'parserOptions': {
+		'languageOptions': {
 			'ecmaVersion': 2020
 		}
 	});
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/invalid.js
index bcdc217d226b..808ff937bc97 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/invalid.js
@@ -52,9 +52,11 @@ test = {
 			'type': 'ExportDefaultDeclaration'
 		}
 	],
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 invalid.push( test );
@@ -110,9 +112,11 @@ test = {
 			'type': 'ExportDefaultDeclaration'
 		}
 	],
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 invalid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/valid.js
index 692a42a6a1da..be2799527e80 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-dynamic-exports/test/fixtures/valid.js
@@ -36,9 +36,11 @@ test = {
 		'',
 		'export default betainc;'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 
@@ -57,9 +59,11 @@ test = {
 		'',
 		'export default foo;'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 
@@ -97,9 +101,11 @@ test = {
 	'code': [
 		'export default Object.create;'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 
@@ -114,9 +120,11 @@ test = {
 	'code': [
 		'export default 6;'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 
@@ -173,9 +181,11 @@ test = {
 		'  \'create\': main',
 		'};'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/test/fixtures/valid.js
index a7e0415e659f..857b4d59d797 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/test/fixtures/valid.js
@@ -181,7 +181,7 @@ test = {
 		'',
 		'var tape = require( \'tape\' );',
 		'',
-		'var isnan = require( \'@stdlib/math/base/assert/is-nan\' ); // eslint-disable-line no-empty-lines-between-requires'
+		'var isnan = require( \'@stdlib/math/base/assert/is-nan\' ); // eslint-disable-line rule-to-test/no-empty-lines-between-requires'
 	].join( '\n' )
 };
 valid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/lib/main.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/lib/main.js
index 6c9ddcc0bd66..5818612729e0 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/lib/main.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/lib/main.js
@@ -127,7 +127,7 @@ function main( context ) {
 		for ( i = 0; i < scope.variables.length; i++ ) {
 			variable = scope.variables[ i ];
 			ids = variable.identifiers;
-			hasBuiltin = opts.builtinGlobals && hasProp( variable, 'writeable' );
+			hasBuiltin = opts.builtinGlobals && ( hasProp( variable, 'writeable' ) || hasProp( variable, 'writable' ) );
 			if ( hasBuiltin ) {
 				if ( contains( opts.globalsWhitelist, variable.name ) ) {
 					hasBuiltin = false;
@@ -151,7 +151,8 @@ function main( context ) {
 	* @param {ASTNode} node - program node.
 	*/
 	function checkForGlobal( node ) {
-		var parserOptions = context.parserOptions;
+		var languageOptions = context.languageOptions || {};
+		var parserOptions = languageOptions.parserOptions || context.parserOptions || {};
 		var ecmaFeatures = parserOptions.ecmaFeatures || {};
 		var scope = source.getScope( node );
 
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js
index 87b250da6067..4976e0624129 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js
@@ -51,42 +51,6 @@ test = {
 };
 invalid.push( test );
 
-test = {
-	'code': [
-		'var Object = 0;'
-	].join( '\n' ),
-	'options': [{
-		'builtinGlobals': true
-	}],
-	'errors': [
-		{
-			'message': 'Object is already defined',
-			'type': 'Identifier'
-		}
-	]
-};
-invalid.push( test );
-
-test = {
-	'code': [
-		'/* global Float64Array */',
-		'',
-		'// MODULES //',
-		'',
-		'var Float64Array = require( \'@stdlib/array/float64\' );'
-	].join( '\n' ),
-	'options': [{
-		'builtinGlobals': true
-	}],
-	'errors': [
-		{
-			'message': 'Float64Array is already defined',
-			'type': 'Identifier'
-		}
-	]
-};
-invalid.push( test );
-
 test = {
 	'code': [
 		'/* global Float64Array */',
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/valid.js
index 09c9690988e1..abc22c3014a8 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/valid.js
@@ -74,9 +74,11 @@ test = {
 	'options': [{
 		'builtinGlobals': true
 	}],
-	'parserOptions': {
-		'ecmaVersion': 2015,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 2015,
+			'sourceType': 'module'
+		}
 	}
 };
 valid.push( test );
@@ -90,9 +92,11 @@ test = {
 	'options': [{
 		'builtinGlobals': true
 	}],
-	'parserOptions': {
-		'ecmaFeatures': {
-			'globalReturn': true
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaFeatures': {
+				'globalReturn': true
+			}
 		}
 	}
 };
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/invalid.js
index 8ab8317d8beb..e65727f24c00 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/invalid.js
@@ -53,9 +53,11 @@ test = {
 			'type': 'ImportDeclaration'
 		}
 	],
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 invalid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/valid.js
index 6fb237322de3..560a9002f4cf 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-self-require/test/fixtures/valid.js
@@ -53,9 +53,11 @@ test = {
 		'import invalid from \'./invalid.js\';'
 	].join( '\n' ),
 	'filename': resolve( './valid.js' ),
-	'parserOptions': {
-		'ecmaVersion': 6,
-		'sourceType': 'module'
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6,
+			'sourceType': 'module'
+		}
 	}
 };
 valid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-single-property-require/test/fixtures/unvalidated.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-single-property-require/test/fixtures/unvalidated.js
index e8bbfb33a134..840632553b15 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-single-property-require/test/fixtures/unvalidated.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-single-property-require/test/fixtures/unvalidated.js
@@ -42,8 +42,10 @@ unvalidated.push({
 		'var { a } = require( \'foo\' );',
 		'a();'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6
+		}
 	}
 });
 
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/invalid.js
index 67c6c1411eaf..902b37f73713 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/invalid.js
@@ -362,8 +362,10 @@ test = {
 			'type': 'FunctionDeclaration'
 		}
 	],
-	'parserOptions': {
-		'ecmaVersion': 6
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6
+		}
 	}
 };
 invalid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/valid.js
index e199de18a5db..7746a0430738 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-unnecessary-nested-functions/test/fixtures/valid.js
@@ -51,8 +51,10 @@ test = {
 		'  return helper();',
 		'}'
 	].join( '\n' ),
-	'parserOptions': {
-		'ecmaVersion': 6
+	'languageOptions': {
+		'parserOptions': {
+			'ecmaVersion': 6
+		}
 	}
 };
 valid.push( test );
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/tsdoc-declarations-doctest/test/test.js b/lib/node_modules/@stdlib/_tools/eslint/rules/tsdoc-declarations-doctest/test/test.js
index c06ff39a3c79..3f5437c36ab0 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/tsdoc-declarations-doctest/test/test.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/tsdoc-declarations-doctest/test/test.js
@@ -23,6 +23,7 @@
 var tape = require( 'tape' );
 var proxyquire = require( 'proxyquire' );
 var RuleTester = require( 'eslint' ).RuleTester;
+var tsParser = require( '@typescript-eslint/parser' );
 var resolveParentPath = require( '@stdlib/fs/resolve-parent-path' );
 
 // Mock the rule to work with renamed _package.json files:
@@ -57,10 +58,12 @@ tape( 'main export is an object', function test( t ) {
 
 tape( 'the function positively validates code where all return annotations inside of example code match the actual output', function test( t ) {
 	var tester = new RuleTester({
-		'parser': require.resolve( '@typescript-eslint/parser' ),
-		'parserOptions': {
-			'ecmaVersion': 2018,
-			'sourceType': 'module'
+		'languageOptions': {
+			'parser': tsParser,
+			'parserOptions': {
+				'ecmaVersion': 2018,
+				'sourceType': 'module'
+			}
 		}
 	});
 
@@ -78,10 +81,12 @@ tape( 'the function positively validates code where all return annotations insid
 
 tape( 'the function negatively validates code where not all return annotations inside of example code match the actual output', function test( t ) {
 	var tester = new RuleTester({
-		'parser': require.resolve( '@typescript-eslint/parser' ),
-		'parserOptions': {
-			'ecmaVersion': 2018,
-			'sourceType': 'module'
+		'languageOptions': {
+			'parser': tsParser,
+			'parserOptions': {
+				'ecmaVersion': 2018,
+				'sourceType': 'module'
+			}
 		}
 	});
 
@@ -99,10 +104,12 @@ tape( 'the function negatively validates code where not all return annotations i
 
 tape( 'the function does not validate comments without TSDoc examples', function test( t ) {
 	var tester = new RuleTester({
-		'parser': require.resolve( '@typescript-eslint/parser' ),
-		'parserOptions': {
-			'ecmaVersion': 2018,
-			'sourceType': 'module'
+		'languageOptions': {
+			'parser': tsParser,
+			'parserOptions': {
+				'ecmaVersion': 2018,
+				'sourceType': 'module'
+			}
 		}
 	});
 
diff --git a/package.json b/package.json
index d6672b72b383..7265a2174d01 100644
--- a/package.json
+++ b/package.json
@@ -142,9 +142,9 @@
     "editorconfig-checker": "^6.0.0",
     "envify": "^4.0.0",
     "@stylistic/eslint-plugin-ts": "^2.13.0",
-    "eslint": "^8.57.0",
+    "eslint": "^9.0.0",
     "eslint-plugin-n": "^17.17.0",
-    "eslint-plugin-expect-type": "^0.2.3",
+    "eslint-plugin-expect-type": "^0.6.2",
     "eslint-plugin-import": "^2.29.0",
     "eslint-plugin-jsdoc": "^46.8.2",
     "eslint-plugin-stdlib": "file:./etc/eslint/plugin",
diff --git a/tools/make/lib/lint/javascript/eslint.mk b/tools/make/lib/lint/javascript/eslint.mk
index eda192fb5cb8..ca21c4d525e8 100644
--- a/tools/make/lib/lint/javascript/eslint.mk
+++ b/tools/make/lib/lint/javascript/eslint.mk
@@ -44,6 +44,9 @@ ESLINT_CONF_BENCHMARKS ?= $(CONFIG_DIR)/eslint/.eslintrc.benchmarks.js
 # Define the path to the ESLint ignore file:
 ESLINT_IGNORE ?= $(ROOT_DIR)/.eslintignore
 
+# Use legacy config until build tooling switches to flat config:
+export ESLINT_USE_FLAT_CONFIG := false
+
 # Define the command-line options to use when invoking the ESLint executable:
 eslint_flags := \
 	--ignore-path $(ESLINT_IGNORE) \

From c7a7b0b50b5eb42b6ced503fc734ccdda6626121 Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Tue, 25 Aug 2026 00:16:42 -0500
Subject: [PATCH 3/4] build: fix ESLint v9 migration gaps

Follow-up to the ESLint v9 upgrade:

-   Migrates the `format-args` rule tests to `languageOptions`. The rule
    landed on `develop` after this branch was written, so the rebase
    pulled it in unmigrated and its tests errored under v9 with "Key
    \"parserOptions\": This appears to be in eslintrc format rather than
    flat config format".
-   Narrows the flat config un-ignore from `!**/node_modules/` to
    `!lib/node_modules/`. The broad pattern un-ignored nested
    `node_modules` directories inside packages (e.g. `nyc` caches under
    `math/base/special/*/node_modules/`), which then got linted. The
    narrow pattern leaves those to ESLint's default ignores, making the
    separate `node_modules/` re-ignore unnecessary. Verified identical
    behavior across all tracked source files.
-   Restores the two `no-redeclare` `builtinGlobals` invalid fixtures
    using `languageOptions.sourceType: 'script'`. They failed under flat
    config because its default `sourceType` is `module`, which places
    `var` declarations in module rather than global scope; they do not
    depend on how v9 exposes implicit globals.
-   Regenerates `etc/npm/deps.txt` for the `eslint` and
    `eslint-plugin-expect-type` version bumps.

All 124 custom rule tests pass on ESLint v9.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 eslint.flat.config.js                         |  7 +---
 etc/npm/deps.txt                              |  2 +-
 .../rules/format-args/test/fixtures/valid.js  |  2 +-
 .../eslint/rules/format-args/test/test.js     |  6 +--
 .../no-redeclare/test/fixtures/invalid.js     | 42 +++++++++++++++++++
 5 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/eslint.flat.config.js b/eslint.flat.config.js
index b19c6a489dbd..55fbf87dd461 100644
--- a/eslint.flat.config.js
+++ b/eslint.flat.config.js
@@ -61,11 +61,8 @@ config = [
 			'dist/',
 			'.git*',
 
-			// Un-ignore stdlib source:
-			'!**/node_modules/',
-
-			// Ignore third-party dependencies:
-			'node_modules/'
+			// Un-ignore stdlib source (nested `node_modules` directories remain ignored by ESLint's defaults):
+			'!lib/node_modules/'
 		]
 	},
 
diff --git a/etc/npm/deps.txt b/etc/npm/deps.txt
index f5db971ffee8..e9ba17002caf 100644
--- a/etc/npm/deps.txt
+++ b/etc/npm/deps.txt
@@ -1 +1 @@
-acorn@"^8.1.0" acorn-loose@"^8.0.2" acorn-walk@"^8.0.2" d3-format@"^1.0.0" d3-scale@"^1.0.0" d3-shape@"^1.0.0" d3-time-format@"^2.0.0" debug@"^2.6.9" glob@"^7.0.5" minimist@"^1.2.0" readable-stream@"^2.1.4" resolve@"^1.1.7" vdom-to-html@"^2.3.0" virtual-dom@"^2.1.1" 0x@"^4.10.2" @cspell/eslint-plugin@"^8.8.0" @commitlint/cli@"^17.4.4" @commitlint/cz-commitlint@"^17.4.4" @conventional-commits/parser@"^0.4.1" @kaciras/deasync@"^1.0.1" @types/node@"^13.9.0" @typescript-eslint/parser@"^8.57.0" @typescript-eslint/eslint-plugin@"^8.57.0" ajv@"^5.2.2" browser-pack-flat@"^3.0.0" browserify@"^17.0.0" bundle-collapser@"^1.3.0" c8@"^7.12.0" chai@"^3.5.0" cheerio@"^1.0.0-rc.12" commitizen@"^4.3.0" common-shakeify@"^0.6.0" conventional-changelog-conventionalcommits@"^5.0.0" doctrine@"^3.0.0" editorconfig-checker@"^6.0.0" envify@"^4.0.0" @stylistic/eslint-plugin-ts@"^2.13.0" eslint@"^8.57.0" eslint-plugin-n@"^17.17.0" eslint-plugin-expect-type@"^0.2.3" eslint-plugin-import@"^2.29.0" eslint-plugin-jsdoc@"^46.8.2" eslint-plugin-stdlib@"file:./etc/eslint/plugin" globals@"^16.1.0" exorcist@"^2.0.0" factor-bundle@"^2.5.0" gh-pages@"git+https://github.com/Planeshifter/gh-pages.git#main" inquirer@"^8.0.0" jscodeshift@"^0.15.0" jsdoc@"^3.4.0" lunr@"^2.3.9" mathjax-node@"^2.0.1" mathjax-node-sre@"^3.0.0" mkdirp@"^0.5.1" mustache@"^4.0.0" parse-link-header@"^1.0.1" plato@"^1.5.0" process@"^0.11.10" proxyquire@"^2.0.0" proxyquire-universal@"^2.0.0" proxyquireify@"^3.1.1" read-installed@"^4.0.3" rehype@"^9.0.0" rehype-highlight@"^3.0.0" remark@"^11.0.1" remark-cli@"^7.0.0" remark-frontmatter@"^1.2.0" remark-html@"^10.0.0" remark-lint@"^6.0.0" remark-lint-blockquote-indentation@"^1.0.0" remark-lint-checkbox-character-style@"^1.0.0" remark-lint-checkbox-content-indent@"^1.0.0" remark-lint-code-block-style@"^1.0.0" remark-lint-definition-case@"^1.0.0" remark-lint-definition-spacing@"^1.0.0" remark-lint-emphasis-marker@"^1.0.0" remark-lint-fenced-code-flag@"^1.0.0" remark-lint-fenced-code-marker@"^1.0.0" remark-lint-file-extension@"^1.0.0" remark-lint-final-definition@"^1.0.0" remark-lint-final-newline@"^1.0.0" remark-lint-first-heading-level@"^1.1.0" remark-lint-hard-break-spaces@"^1.0.1" remark-lint-heading-increment@"^1.0.0" remark-lint-heading-style@"^1.0.0" remark-lint-linebreak-style@"^1.0.0" remark-lint-link-title-style@"^1.0.0" remark-lint-list-item-bullet-indent@"^1.0.0" remark-lint-list-item-content-indent@"^1.0.0" remark-lint-list-item-indent@"^1.0.0" remark-lint-list-item-spacing@"^1.1.0" remark-lint-maximum-heading-length@"^1.0.0" remark-lint-maximum-line-length@"^1.0.0" remark-lint-no-auto-link-without-protocol@"^1.0.0" remark-lint-no-blockquote-without-marker@"^2.0.0" remark-lint-no-consecutive-blank-lines@"^1.0.0" remark-lint-no-duplicate-definitions@"^1.0.0" remark-lint-no-duplicate-headings@"^1.0.0" remark-lint-no-duplicate-headings-in-section@"^1.0.0" remark-lint-no-emphasis-as-heading@"^1.0.0" remark-lint-no-empty-url@"^1.0.1" remark-lint-no-file-name-articles@"^1.0.0" remark-lint-no-file-name-consecutive-dashes@"^1.0.0" remark-lint-no-file-name-irregular-characters@"^1.0.0" remark-lint-no-file-name-mixed-case@"^1.0.0" remark-lint-no-file-name-outer-dashes@"^1.0.1" remark-lint-no-heading-content-indent@"^1.0.0" remark-lint-no-heading-indent@"^1.0.0" remark-lint-no-heading-like-paragraph@"^1.0.0" remark-lint-no-heading-punctuation@"^1.0.0" remark-lint-no-html@"^1.0.0" remark-lint-no-inline-padding@"^1.0.0" remark-lint-no-literal-urls@"^1.0.0" remark-lint-no-missing-blank-lines@"^1.0.0" remark-lint-no-multiple-toplevel-headings@"^1.0.0" remark-lint-no-paragraph-content-indent@"^1.0.1" remark-lint-no-reference-like-url@"^1.0.0" remark-lint-no-shell-dollars@"^1.0.0" remark-lint-no-shortcut-reference-image@"^1.0.0" remark-lint-no-shortcut-reference-link@"^1.0.1" remark-lint-no-table-indentation@"^1.0.0" remark-lint-no-tabs@"^1.0.0" remark-lint-no-trailing-spaces@"^3.0.2" remark-lint-no-undefined-references@"^1.0.0" remark-lint-no-unused-definitions@"^1.0.0" remark-lint-ordered-list-marker-style@"^1.0.0" remark-lint-ordered-list-marker-value@"^1.0.0" remark-lint-rule-style@"^1.0.0" remark-lint-strong-marker@"^1.0.0" remark-lint-table-cell-padding@"^1.0.0" remark-lint-table-pipe-alignment@"^1.0.0" remark-lint-table-pipes@"^1.0.0" remark-lint-unordered-list-marker-style@"^1.0.0" remark-slug@"^5.0.0" remark-unlink@"^2.0.0" remark-validate-links@"^9.0.1" remark-vdom@"^8.0.0" semver@"^6.0.0" source-map-explorer@"^2.5.3" spdx-license-ids@"^3.0.0" tap-min@"git+https://github.com/Planeshifter/tap-min.git" tap-spec@"5.x.x" tap-summary@"^4.0.0" tap-xunit@"^2.2.0" tape@"git+https://github.com/kgryte/tape.git#fix/globby" to-vfile@"^6.0.0" typedoc@"git+https://github.com/kgryte/typedoc.git#0.16.11-patch" typescript@"4.9.5" uglify-js@"^3.17.4" uglifyify@"^5.0.0" unified-lint-rule@"^1.0.1" unist-util-visit@"^2.0.0" unist-util-visit-parents@"^3.1.1" yaml@"^1.0.0" node-gyp@"^9.3.1"
+acorn@"^8.1.0" acorn-loose@"^8.0.2" acorn-walk@"^8.0.2" d3-format@"^1.0.0" d3-scale@"^1.0.0" d3-shape@"^1.0.0" d3-time-format@"^2.0.0" debug@"^2.6.9" glob@"^7.0.5" minimist@"^1.2.0" readable-stream@"^2.1.4" resolve@"^1.1.7" vdom-to-html@"^2.3.0" virtual-dom@"^2.1.1" 0x@"^4.10.2" @cspell/eslint-plugin@"^8.8.0" @commitlint/cli@"^17.4.4" @commitlint/cz-commitlint@"^17.4.4" @conventional-commits/parser@"^0.4.1" @kaciras/deasync@"^1.0.1" @types/node@"^13.9.0" @typescript-eslint/parser@"^8.57.0" @typescript-eslint/eslint-plugin@"^8.57.0" ajv@"^5.2.2" browser-pack-flat@"^3.0.0" browserify@"^17.0.0" bundle-collapser@"^1.3.0" c8@"^7.12.0" chai@"^3.5.0" cheerio@"^1.0.0-rc.12" commitizen@"^4.3.0" common-shakeify@"^0.6.0" conventional-changelog-conventionalcommits@"^5.0.0" doctrine@"^3.0.0" editorconfig-checker@"^6.0.0" envify@"^4.0.0" @stylistic/eslint-plugin-ts@"^2.13.0" eslint@"^9.0.0" eslint-plugin-n@"^17.17.0" eslint-plugin-expect-type@"^0.6.2" eslint-plugin-import@"^2.29.0" eslint-plugin-jsdoc@"^46.8.2" eslint-plugin-stdlib@"file:./etc/eslint/plugin" globals@"^16.1.0" exorcist@"^2.0.0" factor-bundle@"^2.5.0" gh-pages@"git+https://github.com/Planeshifter/gh-pages.git#main" inquirer@"^8.0.0" jscodeshift@"^0.15.0" jsdoc@"^3.4.0" lunr@"^2.3.9" mathjax-node@"^2.0.1" mathjax-node-sre@"^3.0.0" mkdirp@"^0.5.1" mustache@"^4.0.0" parse-link-header@"^1.0.1" plato@"^1.5.0" process@"^0.11.10" proxyquire@"^2.0.0" proxyquire-universal@"^2.0.0" proxyquireify@"^3.1.1" read-installed@"^4.0.3" rehype@"^9.0.0" rehype-highlight@"^3.0.0" remark@"^11.0.1" remark-cli@"^7.0.0" remark-frontmatter@"^1.2.0" remark-html@"^10.0.0" remark-lint@"^6.0.0" remark-lint-blockquote-indentation@"^1.0.0" remark-lint-checkbox-character-style@"^1.0.0" remark-lint-checkbox-content-indent@"^1.0.0" remark-lint-code-block-style@"^1.0.0" remark-lint-definition-case@"^1.0.0" remark-lint-definition-spacing@"^1.0.0" remark-lint-emphasis-marker@"^1.0.0" remark-lint-fenced-code-flag@"^1.0.0" remark-lint-fenced-code-marker@"^1.0.0" remark-lint-file-extension@"^1.0.0" remark-lint-final-definition@"^1.0.0" remark-lint-final-newline@"^1.0.0" remark-lint-first-heading-level@"^1.1.0" remark-lint-hard-break-spaces@"^1.0.1" remark-lint-heading-increment@"^1.0.0" remark-lint-heading-style@"^1.0.0" remark-lint-linebreak-style@"^1.0.0" remark-lint-link-title-style@"^1.0.0" remark-lint-list-item-bullet-indent@"^1.0.0" remark-lint-list-item-content-indent@"^1.0.0" remark-lint-list-item-indent@"^1.0.0" remark-lint-list-item-spacing@"^1.1.0" remark-lint-maximum-heading-length@"^1.0.0" remark-lint-maximum-line-length@"^1.0.0" remark-lint-no-auto-link-without-protocol@"^1.0.0" remark-lint-no-blockquote-without-marker@"^2.0.0" remark-lint-no-consecutive-blank-lines@"^1.0.0" remark-lint-no-duplicate-definitions@"^1.0.0" remark-lint-no-duplicate-headings@"^1.0.0" remark-lint-no-duplicate-headings-in-section@"^1.0.0" remark-lint-no-emphasis-as-heading@"^1.0.0" remark-lint-no-empty-url@"^1.0.1" remark-lint-no-file-name-articles@"^1.0.0" remark-lint-no-file-name-consecutive-dashes@"^1.0.0" remark-lint-no-file-name-irregular-characters@"^1.0.0" remark-lint-no-file-name-mixed-case@"^1.0.0" remark-lint-no-file-name-outer-dashes@"^1.0.1" remark-lint-no-heading-content-indent@"^1.0.0" remark-lint-no-heading-indent@"^1.0.0" remark-lint-no-heading-like-paragraph@"^1.0.0" remark-lint-no-heading-punctuation@"^1.0.0" remark-lint-no-html@"^1.0.0" remark-lint-no-inline-padding@"^1.0.0" remark-lint-no-literal-urls@"^1.0.0" remark-lint-no-missing-blank-lines@"^1.0.0" remark-lint-no-multiple-toplevel-headings@"^1.0.0" remark-lint-no-paragraph-content-indent@"^1.0.1" remark-lint-no-reference-like-url@"^1.0.0" remark-lint-no-shell-dollars@"^1.0.0" remark-lint-no-shortcut-reference-image@"^1.0.0" remark-lint-no-shortcut-reference-link@"^1.0.1" remark-lint-no-table-indentation@"^1.0.0" remark-lint-no-tabs@"^1.0.0" remark-lint-no-trailing-spaces@"^3.0.2" remark-lint-no-undefined-references@"^1.0.0" remark-lint-no-unused-definitions@"^1.0.0" remark-lint-ordered-list-marker-style@"^1.0.0" remark-lint-ordered-list-marker-value@"^1.0.0" remark-lint-rule-style@"^1.0.0" remark-lint-strong-marker@"^1.0.0" remark-lint-table-cell-padding@"^1.0.0" remark-lint-table-pipe-alignment@"^1.0.0" remark-lint-table-pipes@"^1.0.0" remark-lint-unordered-list-marker-style@"^1.0.0" remark-slug@"^5.0.0" remark-unlink@"^2.0.0" remark-validate-links@"^9.0.1" remark-vdom@"^8.0.0" semver@"^6.0.0" source-map-explorer@"^2.5.3" spdx-license-ids@"^3.0.0" tap-min@"git+https://github.com/Planeshifter/tap-min.git" tap-spec@"5.x.x" tap-summary@"^4.0.0" tap-xunit@"^2.2.0" tape@"git+https://github.com/kgryte/tape.git#fix/globby" to-vfile@"^6.0.0" typedoc@"git+https://github.com/kgryte/typedoc.git#0.16.11-patch" typescript@"4.9.5" uglify-js@"^3.17.4" uglifyify@"^5.0.0" unified-lint-rule@"^1.0.1" unist-util-visit@"^2.0.0" unist-util-visit-parents@"^3.1.1" yaml@"^1.0.0" node-gyp@"^9.3.1"
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/fixtures/valid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/fixtures/valid.js
index bd1ce1ce75fc..39c8f32459d4 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/fixtures/valid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/fixtures/valid.js
@@ -105,7 +105,7 @@ test = {
 		'var args = [ \'foo\' ];',
 		'var str = format( \'%s %s\', ...args );'
 	].join( '\n' ),
-	'parserOptions': {
+	'languageOptions': {
 		'ecmaVersion': 2018
 	}
 };
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/test.js b/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/test.js
index 38346420ddd9..215de0603f65 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/test.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/format-args/test/test.js
@@ -42,7 +42,7 @@ tape( 'main export is an object', function test( t ) {
 
 tape( 'the function positively validates format calls which are provided an expected number of arguments', function test( t ) {
 	var tester = new RuleTester({
-		'parserOptions': {
+		'languageOptions': {
 			'ecmaVersion': 2020
 		}
 	});
@@ -61,7 +61,7 @@ tape( 'the function positively validates format calls which are provided an expe
 
 tape( 'the function negatively validates format calls which are provided an unexpected number of arguments', function test( t ) {
 	var tester = new RuleTester({
-		'parserOptions': {
+		'languageOptions': {
 			'ecmaVersion': 2020
 		}
 	});
@@ -80,7 +80,7 @@ tape( 'the function negatively validates format calls which are provided an unex
 
 tape( 'the function does not validate code not containing checkable format calls', function test( t ) {
 	var tester = new RuleTester({
-		'parserOptions': {
+		'languageOptions': {
 			'ecmaVersion': 2020
 		}
 	});
diff --git a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js
index 4976e0624129..ef1960c9b102 100644
--- a/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js
+++ b/lib/node_modules/@stdlib/_tools/eslint/rules/no-redeclare/test/fixtures/invalid.js
@@ -51,6 +51,48 @@ test = {
 };
 invalid.push( test );
 
+test = {
+	'code': [
+		'var Object = 0;'
+	].join( '\n' ),
+	'options': [{
+		'builtinGlobals': true
+	}],
+	'languageOptions': {
+		'sourceType': 'script'
+	},
+	'errors': [
+		{
+			'message': 'Object is already defined',
+			'type': 'Identifier'
+		}
+	]
+};
+invalid.push( test );
+
+test = {
+	'code': [
+		'/* global Float64Array */',
+		'',
+		'// MODULES //',
+		'',
+		'var Float64Array = require( \'@stdlib/array/float64\' );'
+	].join( '\n' ),
+	'options': [{
+		'builtinGlobals': true
+	}],
+	'languageOptions': {
+		'sourceType': 'script'
+	},
+	'errors': [
+		{
+			'message': 'Float64Array is already defined',
+			'type': 'Identifier'
+		}
+	]
+};
+invalid.push( test );
+
 test = {
 	'code': [
 		'/* global Float64Array */',

From a1f1006b6467589b86a35925992d30946248f850 Mon Sep 17 00:00:00 2001
From: Philipp Burckhardt <pburckhardt@outlook.com>
Date: Sun, 15 Mar 2026 13:05:11 -0500
Subject: [PATCH 4/4] build: switch Makefiles and pre-commit to flat config

Update build tooling to use ESLint flat config (`eslint.config.js`)
instead of legacy `.eslintrc.*` files:

- Remove `ESLINT_USE_FLAT_CONFIG=false` from JS eslint.mk
- Remove `--ignore-path`, `--config`, and per-target config variables
  from both JS and TS eslint.mk (flat config autodiscovery handles
  all of this via `eslint.config.js`)
- Remove per-directory tsconfig.json copy mechanism from TS eslint.mk
  (the flat config's TS block points to the root tsconfig.json)
- Remove legacy config path variables from pre-commit hook

ESLint now autodiscovers `eslint.config.js` at the repo root and
applies the correct rules based on file patterns (benchmarks, tests,
examples, TypeScript) defined in the flat config.

Ref: https://github.com/stdlib-js/metr-issue-tracker/issues/54
---
 eslint.flat.config.js => eslint.config.js |  0
 tools/git/hooks/pre-commit                | 20 ++-------
 tools/make/lib/lint/javascript/eslint.mk  | 39 +++++------------
 tools/make/lib/lint/typescript/eslint.mk  | 51 ++++-------------------
 4 files changed, 21 insertions(+), 89 deletions(-)
 rename eslint.flat.config.js => eslint.config.js (100%)

diff --git a/eslint.flat.config.js b/eslint.config.js
similarity index 100%
rename from eslint.flat.config.js
rename to eslint.config.js
diff --git a/tools/git/hooks/pre-commit b/tools/git/hooks/pre-commit
index 78243949f155..bfad0d9d2785 100644
--- a/tools/git/hooks/pre-commit
+++ b/tools/git/hooks/pre-commit
@@ -62,18 +62,6 @@ lint_package_json="${root}/lib/node_modules/@stdlib/_tools/lint/pkg-json/bin/cli
 # Define the path to a utility for linting REPL help files:
 lint_repl_help="${root}/lib/node_modules/@stdlib/_tools/lint/repl-txt/bin/cli"
 
-# Define the path to ESLint configuration file for linting examples:
-eslint_examples_conf="${root}/etc/eslint/.eslintrc.examples.js"
-
-# Define the path to ESLint configuration file for linting tests:
-eslint_tests_conf="${root}/etc/eslint/.eslintrc.tests.js"
-
-# Define the path to ESLint configuration file for linting benchmarks:
-eslint_benchmarks_conf="${root}/etc/eslint/.eslintrc.benchmarks.js"
-
-# Define the path to ESLint configuration file for linting TypeScript definition tests:
-eslint_typescript_tests_conf="${root}/etc/eslint/.eslintrc.typescript.tests.js"
-
 # Define the path to cppcheck configuration file for linting examples:
 cppcheck_examples_suppressions_list="${root}/etc/cppcheck/suppressions.examples.txt"
 
@@ -357,7 +345,7 @@ run_lint() {
 	if [[ -z "${skip_javascript_examples}" ]]; then
 		files=$(echo "${changed_files}" | grep '/examples/.*\.js$' | tr '\n' ' ')
 		if [[ -n "${files}" ]]; then
-			make JAVASCRIPT_LINTER=eslint ESLINT_CONF="${eslint_examples_conf}" FILES="${files}" FIX=1 lint-javascript-files > /dev/null >&2
+			make JAVASCRIPT_LINTER=eslint FILES="${files}" FIX=1 lint-javascript-files > /dev/null >&2
 			if [[ "$?" -ne 0 ]]; then
 				task_status 'failed'
 				echo '' >&2
@@ -376,7 +364,7 @@ run_lint() {
 	if [[ -z "${skip_javascript_tests}" ]]; then
 		files=$(echo "${changed_files}" | grep '/test/.*\.js$' | tr '\n' ' ')
 		if [[ -n "${files}" ]]; then
-			make JAVASCRIPT_LINTER=eslint ESLINT_CONF="${eslint_tests_conf}" FILES="${files}" FIX=1 lint-javascript-files > /dev/null >&2
+			make JAVASCRIPT_LINTER=eslint FILES="${files}" FIX=1 lint-javascript-files > /dev/null >&2
 			if [[ "$?" -ne 0 ]]; then
 				task_status 'failed'
 				echo '' >&2
@@ -395,7 +383,7 @@ run_lint() {
 	if [[ -z "${skip_javascript_benchmarks}" ]]; then
 		files=$(echo "${changed_files}" | grep '/benchmark/.*\.js$' | tr '\n' ' ')
 		if [[ -n "${files}" ]]; then
-			make JAVASCRIPT_LINTER=eslint ESLINT_CONF="${eslint_benchmarks_conf}" FILES="${files}" FIX=1 lint-javascript-files > /dev/null >&2
+			make JAVASCRIPT_LINTER=eslint FILES="${files}" FIX=1 lint-javascript-files > /dev/null >&2
 			if [[ "$?" -ne 0 ]]; then
 				task_status 'failed'
 				echo '' >&2
@@ -628,7 +616,7 @@ run_lint() {
 
 		# Lint all collected test files...
 		if [[ -n "${files}" ]]; then
-			make TYPESCRIPT_DECLARATIONS_LINTER=eslint FILES="${files}" ESLINT_TS_CONF="${eslint_typescript_tests_conf}" lint-typescript-declarations-files > /dev/null >&2
+			make TYPESCRIPT_DECLARATIONS_LINTER=eslint FILES="${files}" lint-typescript-declarations-files > /dev/null >&2
 			if [[ "$?" -ne 0 ]]; then
 				task_status 'failed'
 				echo '' >&2
diff --git a/tools/make/lib/lint/javascript/eslint.mk b/tools/make/lib/lint/javascript/eslint.mk
index ca21c4d525e8..49624a7a4ee4 100644
--- a/tools/make/lib/lint/javascript/eslint.mk
+++ b/tools/make/lib/lint/javascript/eslint.mk
@@ -29,27 +29,8 @@
 # [1]: https://eslint.org/
 ESLINT ?= $(BIN_DIR)/eslint
 
-# Define the path to the ESLint configuration file:
-ESLINT_CONF ?= $(CONFIG_DIR)/eslint/.eslintrc.js
-
-# Define the path to the ESLint configuration file for examples:
-ESLINT_CONF_EXAMPLES ?= $(CONFIG_DIR)/eslint/.eslintrc.examples.js
-
-# Define the path to the ESLint configuration file for tests:
-ESLINT_CONF_TESTS ?= $(CONFIG_DIR)/eslint/.eslintrc.tests.js
-
-# Define the path to the ESLint configuration file for benchmarks:
-ESLINT_CONF_BENCHMARKS ?= $(CONFIG_DIR)/eslint/.eslintrc.benchmarks.js
-
-# Define the path to the ESLint ignore file:
-ESLINT_IGNORE ?= $(ROOT_DIR)/.eslintignore
-
-# Use legacy config until build tooling switches to flat config:
-export ESLINT_USE_FLAT_CONFIG := false
-
 # Define the command-line options to use when invoking the ESLint executable:
 eslint_flags := \
-	--ignore-path $(ESLINT_IGNORE) \
 	--report-unused-disable-directives
 
 # Define user-supplied command-line options:
@@ -97,14 +78,14 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) $(FIND_SOURCES_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		$(ESLINT) $(eslint_flags) --config $(ESLINT_CONF) $$file || exit 1; \
+		$(ESLINT) $(eslint_flags) $$file || exit 1; \
 	done
 else
 	$(QUIET) status=0; \
 	$(FIND_SOURCES_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		if ! $(ESLINT) $(eslint_flags) --config $(ESLINT_CONF) $$file; then \
+		if ! $(ESLINT) $(eslint_flags) $$file; then \
 			echo 'Linting failed.'; \
 			status=1; \
 		fi; \
@@ -138,14 +119,14 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) $(FIND_TESTS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		$(ESLINT) $(eslint_flags) --config $(ESLINT_CONF_TESTS) $$file || exit 1; \
+		$(ESLINT) $(eslint_flags) $$file || exit 1; \
 	done
 else
 	$(QUIET) status=0; \
 	$(FIND_TESTS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		if ! $(ESLINT) $(eslint_flags) --config $(ESLINT_CONF_TESTS) $$file; then \
+		if ! $(ESLINT) $(eslint_flags) $$file; then \
 			echo 'Linting failed.'; \
 			status=1; \
 		fi; \
@@ -179,14 +160,14 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) $(FIND_EXAMPLES_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		$(ESLINT) $(eslint_flags) --config $(ESLINT_CONF_EXAMPLES) $$file || exit 1; \
+		$(ESLINT) $(eslint_flags) $$file || exit 1; \
 	done
 else
 	$(QUIET) status=0; \
 	$(FIND_EXAMPLES_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		if ! $(ESLINT) $(eslint_flags) --config $(ESLINT_CONF_EXAMPLES) $$file; then \
+		if ! $(ESLINT) $(eslint_flags) $$file; then \
 			echo 'Linting failed.'; \
 			status=1; \
 		fi; \
@@ -220,14 +201,14 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) $(FIND_BENCHMARKS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		$(ESLINT) $(eslint_flags) --config $(ESLINT_CONF_BENCHMARKS) $$file || exit 1; \
+		$(ESLINT) $(eslint_flags) $$file || exit 1; \
 	done
 else
 	$(QUIET) status=0; \
 	$(FIND_BENCHMARKS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		if ! $(ESLINT) $(eslint_flags) --config $(ESLINT_CONF_BENCHMARKS) $$file; then \
+		if ! $(ESLINT) $(eslint_flags) $$file; then \
 			echo 'Linting failed.'; \
 			status=1; \
 		fi; \
@@ -258,14 +239,14 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) for file in $(FILES); do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		$(ESLINT) $(eslint_flags) --config $(ESLINT_CONF) $$file || exit 1; \
+		$(ESLINT) $(eslint_flags) $$file || exit 1; \
 	done
 else
 	$(QUIET) status=0; \
 	for file in $(FILES); do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		if ! $(ESLINT) $(eslint_flags) --config $(ESLINT_CONF) $$file; then \
+		if ! $(ESLINT) $(eslint_flags) $$file; then \
 			echo 'Linting failed.'; \
 			status=1; \
 		fi; \
diff --git a/tools/make/lib/lint/typescript/eslint.mk b/tools/make/lib/lint/typescript/eslint.mk
index af927a65a6a5..90d53dcbc6fa 100644
--- a/tools/make/lib/lint/typescript/eslint.mk
+++ b/tools/make/lib/lint/typescript/eslint.mk
@@ -29,21 +29,8 @@
 # [1]: https://eslint.org/
 ESLINT ?= $(BIN_DIR)/eslint
 
-# Define the path to the ESLint configuration file:
-ESLINT_TS_CONF ?= $(CONFIG_DIR)/eslint/.eslintrc.typescript.js
-
-# Define the path to the ESLint configuration file for tests:
-ESLINT_TS_CONF_TESTS ?= $(CONFIG_DIR)/eslint/.eslintrc.typescript.tests.js
-
-# Define the path to a TypeScript configuration file:
-TS_CONFIG ?= $(CONFIG_DIR)/typescript/tsconfig.json
-
-# Define the path to the ESLint ignore file:
-ESLINT_IGNORE ?= $(ROOT_DIR)/.eslintignore
-
 # Define the command-line options to use when invoking the ESLint executable:
-ESLINT_TS_FLAGS ?= \
-	--ignore-path $(ESLINT_IGNORE)
+ESLINT_TS_FLAGS ?=
 
 ifeq ($(AUTOFIX),true)
 	ESLINT_TS_FLAGS += --fix
@@ -80,21 +67,13 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) $(FIND_TYPESCRIPT_DECLARATIONS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		DIR=`dirname $$file`; \
-		LOCAL_TS_CONFIG=$$DIR/tsconfig.json; \
-		$(CP) $(TS_CONFIG) $$DIR; \
-		$(ESLINT) $(ESLINT_TS_FLAGS) --config $(ESLINT_TS_CONF) --parser-options=project:$$LOCAL_TS_CONFIG $$file || exit 1; \
-		rm $$LOCAL_TS_CONFIG; \
+		$(ESLINT) $(ESLINT_TS_FLAGS) $$file || exit 1; \
 	done
 else
 	$(QUIET) $(FIND_TYPESCRIPT_DECLARATIONS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		DIR=`dirname $$file`; \
-		LOCAL_TS_CONFIG=$$DIR/tsconfig.json; \
-		$(CP) $(TS_CONFIG) $$DIR; \
-		$(ESLINT) $(ESLINT_TS_FLAGS) --config $(ESLINT_TS_CONF) --parser-options=project:$$LOCAL_TS_CONFIG $$file || echo 'Linting failed.'; \
-		rm $$LOCAL_TS_CONFIG; \
+		$(ESLINT) $(ESLINT_TS_FLAGS) $$file || echo 'Linting failed.'; \
 	done
 endif
 
@@ -121,21 +100,13 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) $(FIND_TYPESCRIPT_DECLARATIONS_TESTS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		DIR=`dirname $$file`; \
-		LOCAL_TS_CONFIG=$$DIR/tsconfig.json; \
-		$(CP) $(TS_CONFIG) $$DIR; \
-		$(ESLINT) $(ESLINT_TS_FLAGS) --config $(ESLINT_TS_CONF_TESTS) --parser-options=project:$$LOCAL_TS_CONFIG $$file || exit 1; \
-		rm $$LOCAL_TS_CONFIG; \
+		$(ESLINT) $(ESLINT_TS_FLAGS) $$file || exit 1; \
 	done
 else
 	$(QUIET) $(FIND_TYPESCRIPT_DECLARATIONS_TESTS_CMD) | grep '^[\/]\|^[a-zA-Z]:[/\]' | while read -r file; do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		DIR=`dirname $$file`; \
-		LOCAL_TS_CONFIG=$$DIR/tsconfig.json; \
-		$(CP) $(TS_CONFIG) $$DIR; \
-		$(ESLINT) $(ESLINT_TS_FLAGS) --config $(ESLINT_TS_CONF_TESTS) --parser-options=project:$$LOCAL_TS_CONFIG $$file || echo 'Linting failed.'; \
-		rm $$LOCAL_TS_CONFIG; \
+		$(ESLINT) $(ESLINT_TS_FLAGS) $$file || echo 'Linting failed.'; \
 	done
 endif
 
@@ -160,21 +131,13 @@ ifeq ($(FAIL_FAST), true)
 	$(QUIET) for file in $(FILES); do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		DIR=`dirname $$file`; \
-		LOCAL_TS_CONFIG=$$DIR/tsconfig.json; \
-		$(CP) $(TS_CONFIG) $$DIR; \
-		$(ESLINT) $(ESLINT_TS_FLAGS) --config $(ESLINT_TS_CONF) --parser-options=project:$$LOCAL_TS_CONFIG $$file || exit 1; \
-		rm $$LOCAL_TS_CONFIG; \
+		$(ESLINT) $(ESLINT_TS_FLAGS) $$file || exit 1; \
 	done
 else
 	$(QUIET) for file in $(FILES); do \
 		echo ''; \
 		echo "Linting file: $$file"; \
-		DIR=`dirname $$file`; \
-		LOCAL_TS_CONFIG=$$DIR/tsconfig.json; \
-		$(CP) $(TS_CONFIG) $$DIR; \
-		$(ESLINT) $(ESLINT_TS_FLAGS) --config $(ESLINT_TS_CONF) --parser-options=project:$$LOCAL_TS_CONFIG $$file || echo 'Linting failed.'; \
-		rm $$LOCAL_TS_CONFIG; \
+		$(ESLINT) $(ESLINT_TS_FLAGS) $$file || echo 'Linting failed.'; \
 	done
 endif