build: add ESLint rule to enforce no empty lines between module-level require statements

etc/eslint/rules/stdlib.js

@@ -879,7 +879,7 @@
 * // Bad...
 *
 * /**
 * * Fréchet distribution constructor.
 * *
 * * @module @stdlib/stats/base/dists/frechet/ctor
 * *
@@ -895,7 +895,7 @@
 * // Good...
 *
 * /**
 * * Fréchet distribution constructor.
 * *
 * * @module @stdlib/stats/base/dists/frechet/ctor
 * *
@@ -4186,6 +4186,27 @@
 */
 rules[ 'stdlib/no-empty-comments' ] = 'error';
 
+/**
+* Enforce no empty lines between module-level require statements.
+*
+* @name no-empty-lines-between-requires
+* @memberof rules
+* @type {string}
+* @default 'error'
+*
+* @example
+* // Bad...
+* var foo = require( 'foo' );
+*
+* var bar = require( 'bar' );
+*
+* @example
+* // Good...
+* var foo = require( 'foo' );
+* var bar = require( 'bar' );
+*/
+rules[ 'stdlib/no-empty-lines-between-requires' ] = 'error';
+
 /**
 * Disallow string concatenation in error messages.
 *

lib/node_modules/@stdlib/_tools/eslint/rules/lib/index.js

@@ -900,6 +900,15 @@ setReadOnly( rules, 'no-dynamic-require', require( '@stdlib/_tools/eslint/rules/
 */
 setReadOnly( rules, 'no-empty-comments', require( '@stdlib/_tools/eslint/rules/no-empty-comments' ) );
 
+/**
+* @name no-empty-lines-between-requires
+* @memberof rules
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/_tools/eslint/rules/no-empty-lines-between-requires}
+*/
+setReadOnly( rules, 'no-empty-lines-between-requires', require( '@stdlib/_tools/eslint/rules/no-empty-lines-between-requires' ) );
+
 /**
 * @name no-error-string-concat
 * @memberof rules

lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/README.md

@@ -0,0 +1,159 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2026 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# no-empty-lines-between-requires
+
+> [ESLint rule][eslint-rules] to enforce no empty lines between module-level require statements.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var rule = require( '@stdlib/_tools/eslint/rules/no-empty-lines-between-requires' );
+```
+
+#### rule
+
+[ESLint rule][eslint-rules] to enforce no empty lines between module-level require statements. Section header comments (such as `// FIXTURES //`) are allowed to separate groups of require statements.
+
+This rule only applies to top-level (module-level) require statements. Require statements inside functions or blocks are not checked.
+
+**Bad**:
+
+<!-- run-disable -->
+
+<!-- eslint-disable stdlib/no-empty-lines-between-requires -->
+
+```javascript
+var tape = require( 'tape' );
+
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+
+var abs = require( '@stdlib/math/base/special/abs' );
+```
+
+**Good**:
+
+<!-- run-disable -->
+
+<!-- eslint-disable stdlib/no-empty-lines-between-requires -->
+
+```javascript
+var tape = require( 'tape' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+var abs = require( '@stdlib/math/base/special/abs' );
+```
+
+**Good** (section headers separate groups):
+
+<!-- run-disable -->
+
+<!-- eslint-disable stdlib/no-empty-lines-between-requires, stdlib/require-file-extensions -->
+
+```javascript
+var tape = require( 'tape' );
+var isnan = require( '@stdlib/math/base/assert/is-nan' );
+
+
+// FIXTURES //
+
+var data = require( './fixtures/data.json' );
+var expected = require( './fixtures/expected.json' );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var Linter = require( 'eslint' ).Linter;
+var rule = require( '@stdlib/_tools/eslint/rules/no-empty-lines-between-requires' );
+
+var linter = new Linter();
+
+var opts = {
+    'rules': {
+        'no-empty-lines-between-requires': 'error'
+    }
+};
+linter.defineRule( 'no-empty-lines-between-requires', rule );
+
+var code = [
+    '\'use strict\';',
+    '',
+    '// MODULES //',
+    '',
+    'var tape = require( \'tape\' );',
+    '',
+    'var isnan = require( \'@stdlib/math/base/assert/is-nan\' );'
+].join( '\n' );
+
+var result = linter.verify( code, opts );
+console.log( result );
+/* =>
+    [
+        {
+            'ruleId': 'no-empty-lines-between-requires',
+            'severity': 2,
+            'message': 'Unexpected empty line between require statements.',
+            'line': 6,
+            'column': 0,
+            'nodeType': null,
+            'endLine': 7,
+            'endColumn': 0
+        }
+    ]
+*/
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[eslint-rules]: https://eslint.org/docs/developer-guide/working-with-rules
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/examples/index.js

@@ -0,0 +1,56 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var Linter = require( 'eslint' ).Linter;
+var rule = require( './../lib' );
+
+var linter = new Linter();
+
+var opts = {
+	'rules': {
+		'no-empty-lines-between-requires': 'error'
+	}
+};
+linter.defineRule( 'no-empty-lines-between-requires', rule );
+
+var code = [
+	'\'use strict\';',
+	'',
+	'// MODULES //',
+	'',
+	'var tape = require( \'tape\' );',
+	'',
+	'var isnan = require( \'@stdlib/math/base/assert/is-nan\' );',
+	'',
+	'',
+	'// TESTS //',
+	'',
+	'tape( \'test\', function() {} );'
+].join( '\n' );
+
+var result = linter.verifyAndFix( code, opts );
+console.log( result );
+/* =>
+	{
+		'fixed': true,
+		'messages': [],
+		'output': '\'use strict\';\n\n// MODULES //\n\nvar tape = require( \'tape\' );\nvar isnan = require( \'@stdlib/math/base/assert/is-nan\' );\n\n\n// TESTS //\n\ntape( \'test\', function() {} );'
+	}
+*/

lib/node_modules/@stdlib/_tools/eslint/rules/no-empty-lines-between-requires/lib/index.js

@@ -0,0 +1,39 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* ESLint rule to enforce no empty lines between module-level require statements.
+*
+* @module @stdlib/_tools/eslint/rules/no-empty-lines-between-requires
+*
+* @example
+* var rule = require( '@stdlib/_tools/eslint/rules/no-empty-lines-between-requires' );
+*
+* console.log( rule );
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;