oxc-project/oxc · error · OxcDiagnostic

Unnecessary braces in case clause.

Error message

Unnecessary braces in case clause.

What it means

Emitted by the unicorn/switch-case-braces rule (with the `convert` option) at a `case` clause that already has braces but whose body would not need them under the configured conversion policy. The braces are considered redundant and should be removed for consistency.

Source

Thrown at crates/oxc_linter/src/rules/unicorn/switch_case_braces.rs:28

    ast_util::get_preceding_indent_str,
    context::LintContext,
    rule::{DefaultRuleConfig, Rule},
};

fn switch_case_braces_diagnostic_empty_clause(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Unexpected braces in empty case clause.")
        .with_help("Remove braces in empty case clause.")
        .with_label(span)
}

fn switch_case_braces_diagnostic_missing_braces(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Missing braces in case clause.")
        .with_help("Add Braces for case clause.")
        .with_label(span)
}

fn switch_case_braces_diagnostic_unnecessary_braces(span: Span) -> OxcDiagnostic {
    OxcDiagnostic::warn("Unnecessary braces in case clause.")
        .with_help("Remove Braces for case clause.")
        .with_label(span)
}

#[derive(Debug, Clone, Deserialize)]
pub struct SwitchCaseBraces(Box<SwitchCaseBracesConfig>);

impl Default for SwitchCaseBraces {
    fn default() -> Self {
        Self(Box::new(SwitchCaseBracesConfig::Always))
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema, Default)]
#[serde(rename_all = "kebab-case")]
pub enum SwitchCaseBracesConfig {
    /// Always require braces in case clauses (except empty cases).
    #[default]

View on GitHub (pinned to e1e7af627c)

Solutions

1. Remove the unnecessary braces from the case clause

When it happens

Trigger: Thrown at crates/oxc_linter/src/rules/unicorn/switch_case_braces.rs:28 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/9ed666373d3cc7c9. Report an issue: GitHub.