oxc-project/oxc · error · OxcDiagnostic

Unexpected nested ternary expression without parentheses.

Error message

Unexpected nested ternary expression without parentheses.

What it means

Raised by unicorn/no-nested-ternary (with its default parens mode) when a ternary appears nested inside another ternary without enclosing parentheses, hurting readability and parse intent. The faulting input is the unparenthesized nested conditional at the labeled span.

Source

Thrown at crates/oxc_linter/src/rules/unicorn/no_nested_ternary.rs:9

use oxc_ast::{AstKind, ast::Expression};
use oxc_diagnostics::OxcDiagnostic;
use oxc_macros::declare_oxc_lint;
use oxc_span::Span;

use crate::{AstNode, context::LintContext, rule::Rule};

fn unparenthesized_nested_ternary(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Unexpected nested ternary expression without parentheses.")
        .with_help("Add parentheses around the nested ternary expression.")
        .with_label(span)
}

fn deeply_nested_ternary(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Unexpected deeply nested ternary expression.")
        .with_help("Avoid nesting ternary expressions for more than one level.")
        .with_label(span)
}

#[derive(Debug, Default, Clone)]
pub struct NoNestedTernary;

declare_oxc_lint!(
    /// ### What it does
    ///
    /// Disallow deeply nested ternary expressions.
    ///

View on GitHub (pinned to e1e7af627c)

Solutions

1. Add parentheses around the nested ternary to make grouping explicit
2. Refactor the chain into if/else statements or a lookup map for clarity

When it happens

Trigger: Thrown at crates/oxc_linter/src/rules/unicorn/no_nested_ternary.rs:9 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of oxc-project/oxc@e1e7af627c (2026-08-20). Data as JSON: /api/errors/4ba0a291efdf309d. Report an issue: GitHub.