#no-useless-concat

#Configuration

import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-useless-concat': 'error',
    },
  },
]);

#Rule Details

Disallow unnecessary concatenation of literals or template literals. This rule flags a + that joins two string literals or template literals on the same line, since they could be written as a single literal.

Concatenation that spans multiple source lines is intentionally not reported.

Examples of incorrect code for this rule:

var a = `some` + `string`;
var b = '1' + '0';
var c = '1' + `0`;
var d = `1` + '0';
var e = `1` + `0`;

Examples of correct code for this rule:

// When the variables could hold non-strings
var a = 1 + 1;
var b = 1 + '1';
var c = foo + bar;
var d = 'foo' + bar;

#Original Documentation

• ESLint: no-useless-concat