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Rslint

    no-unexpected-multiline

    Configuration

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

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

    Rule Details

    JavaScript inserts semicolons automatically (ASI), but only at certain positions. When a line break appears between an expression and tokens like (, [, `, or /, the parser treats the next line as a continuation rather than a new statement, which often surprises the author.

    This rule reports four cases where a newline produces an unintended continuation:

    • A function call where ( opens on the next line.
    • A computed property access where [ opens on the next line.
    • A tagged template where the ` opens on the next line.
    • A division by a value that visually resembles a regular-expression literal (e.g. foo / bar /gym), where what looks like a regex is actually parsed as two divisions.

    Examples of incorrect code for this rule:

    var a = b
(x || y).doSomething()

var a = b
[a, b, c].forEach(doSomething)

let x = function() {}
`hello`

foo
/ bar /gym

    Examples of correct code for this rule:

    var a = b;
(x || y).doSomething()

var a = b;
[a, b, c].forEach(doSomething)

let x = function() {};
`hello`

foo / bar / gym

    Original Documentation