multilineAmbiguities

Reports ambiguous multiline expressions that could be misinterpreted.

✅ This rule is included in the ts stylistic and stylisticStrict presets.

When a line ends with an expression and the next line starts with certain characters (parentheses, brackets, or template literals), JavaScript may interpret them as a continuation of the previous line rather than separate statements. This can lead to unexpected behavior and runtime errors that are difficult to debug.

const 
const value: string
value = 
const identifier: (arg: string) => string
identifier(
const expression: string
expression)
const doSomething: () => void
doSomething();

const 
const data: string
data = 
const getArray: {
    value: string;
}[]
getArray
[0].
value: string
value;

const 
const result: string
result = 
const calculate: (strings: TemplateStringsArray) => string
calculate
`template literal`;

function 
function process(): void
process() {
  const 
const a: void
a = 
const b: (arg: {
    execute(): void;
}) => {
    execute(): void;
}
b
  (
const c: {
    execute(): void;
} | undefined
c || 
const d: {
    execute(): void;
}
d).
function execute(): void
execute();
}

const 
const value: string
value = 
const identifier: string
identifier;
const expression: {
    doSomething(): void;
}
expression.
function doSomething(): void
doSomething();

const 
const data: {
    value: string;
}[]
data = 
const getArray: {
    value: string;
}[]
getArray;
[0].
any
value;

const 
const result: (strings: TemplateStringsArray) => string
result = 
const calculate: (strings: TemplateStringsArray) => string
calculate;
`template literal`;

function 
function process(): void
process() {
  const 
const a: string
a = 
const b: string
b;
  (
const c: {
    execute(): void;
} | undefined
c || 
const d: {
    execute(): void;
}
d).
function execute(): void
execute();
}

Options

This rule is not configurable.

When Not To Use It

If you consistently use semicolons and have tooling that enforces their presence, this rule may be unnecessary. However, having this rule enabled provides an additional safety net against accidental multiline ambiguities.

Equivalents in Other Linters

ESLint: no-unexpected-multiline
Oxlint: eslint/no-unexpected-multiline

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multilineAmbiguities

Examples

Options

When Not To Use It

Further Reading

Equivalents in Other Linters