build: add ESLint rule disallowing string concatenation in error messages

etc/eslint/rules/stdlib.js

@@ -850,7 +850,7 @@
 * // Bad...
 *
 * /**
 * * Fréchet distribution constructor.
 * *
 * * @module @stdlib/stats/base/dists/frechet/ctor
 * *
@@ -866,7 +866,7 @@
 * // Good...
 *
 * /**
 * * Fréchet distribution constructor.
 * *
 * * @module @stdlib/stats/base/dists/frechet/ctor
 * *
@@ -4157,6 +4157,25 @@
 */
 rules[ 'stdlib/no-empty-comments' ] = 'error';
 
+/**
+* Disallow string concatenation in error messages.
+*
+* @name no-error-string-concat
+* @memberof rules
+* @type {string}
+* @default 'error'
+*
+* @example
+* // Bad...
+* throw new Error( 'invalid argument. Value: `' + value + '`.' );
+*
+* @example
+* // Good...
+* throw new Error( 'unexpected error.' );
+* throw new Error( format( 'invalid argument. Value: `%s`.', value ) );
+*/
+rules[ 'stdlib/no-error-string-concat' ] = 'error';
+
 /**
 * Enforce that `require()` expressions are not immediately invoked.
 *

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

@@ -882,6 +882,15 @@ 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-error-string-concat
+* @memberof rules
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/_tools/eslint/rules/no-error-string-concat}
+*/
+setReadOnly( rules, 'no-error-string-concat', require( '@stdlib/_tools/eslint/rules/no-error-string-concat' ) );
+
 /**
 * @name no-immediate-require
 * @memberof rules

lib/node_modules/@stdlib/_tools/eslint/rules/no-error-string-concat/README.md

@@ -0,0 +1,124 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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-error-string-concat
+
+> [ESLint rule][eslint-rules] disallowing string concatenation in error messages.
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var rule = require( '@stdlib/_tools/eslint/rules/no-error-string-concat' );
+```
+
+#### rule
+
+[ESLint rule][eslint-rules] disallowing string concatenation in error messages.
+
+**Bad**:
+
+<!-- run-disable -->
+
+<!-- eslint-disable stdlib/no-error-string-concat -->
+
+```javascript
+throw new Error( 'invalid argument. Value: `' + value + '`.' );
+```
+
+**Good**:
+
+<!-- run-disable -->
+
+```javascript
+var format = require( '@stdlib/string/format' );
+
+throw new Error( format( 'invalid argument. Value: `%s`.', value ) );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+```javascript
+var Linter = require( 'eslint' ).Linter;
+var rule = require( '@stdlib/_tools/eslint/rules/no-error-string-concat' );
+
+var linter = new Linter();
+var result;
+var code;
+
+code = 'throw new Error( \'invalid argument. Value: `\' + value + \'`.\' );';
+
+linter.defineRule( 'no-error-string-concat', rule );
+
+result = linter.verify( code, {
+    'rules': {
+        'no-error-string-concat': 'error'
+    }
+});
+/* returns
+    [
+        {
+            'ruleId': 'no-error-string-concat',
+            'severity': 2,
+            'message': 'Use `@stdlib/string/format` instead of string concatenation in error messages.',
+            'line': 1,
+            'column': 18,
+            'nodeType': 'BinaryExpression',
+            'endLine': 1,
+            'endColumn': 61
+        }
+    ]
+*/
+```
+
+</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-error-string-concat/examples/index.js

@@ -0,0 +1,51 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 result;
+var code;
+
+code = 'throw new Error( \'invalid argument. Value: `\' + value + \'`.\' );';
+
+linter.defineRule( 'no-error-string-concat', rule );
+
+result = linter.verify( code, {
+	'rules': {
+		'no-error-string-concat': 'error'
+	}
+});
+console.log( result );
+/* =>
+	[
+		{
+			'ruleId': 'no-error-string-concat',
+			'severity': 2,
+			'message': 'Use `@stdlib/string/format` instead of string concatenation in error messages.',
+			'line': 1,
+			'column': 18,
+			'nodeType': 'BinaryExpression',
+			'endLine': 1,
+			'endColumn': 61
+		}
+	]
+*/

lib/node_modules/@stdlib/_tools/eslint/rules/no-error-string-concat/lib/index.js

@@ -0,0 +1,39 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 disallowing string concatenation in error messages.
+*
+* @module @stdlib/_tools/eslint/rules/no-error-string-concat
+*
+* @example
+* var rule = require( '@stdlib/_tools/eslint/rules/no-error-string-concat' );
+*
+* console.log( rule );
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;