oxc/crates/oxc_linter/src/rules/early_error/javascript.rs

#[allow(clippy::wildcard_imports)]
use oxc_ast::{ast::*, AstKind, Span};
use oxc_diagnostics::{
    miette::{self, Diagnostic},
    thiserror::Error,
};

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

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

impl Rule for EarlyErrorJavaScript {
    #[allow(clippy::single_match)]
    fn run<'a>(&self, node: &AstNode<'a>, ctx: &LintContext<'a>) {
        match node.get().kind() {
            AstKind::RegExpLiteral(lit) => check_regexp_literal(lit, ctx),
            _ => {}
        }
    }
}

fn check_regexp_literal(lit: &RegExpLiteral, ctx: &LintContext) {
    #[derive(Debug, Error, Diagnostic)]
    #[error("The 'u' and 'v' regular expression flags cannot be enabled at the same time")]
    #[diagnostic()]
    struct RegExpFlagUAndV(#[label] Span);

    let flags = lit.regex.flags;
    if flags.contains(RegExpFlags::U | RegExpFlags::V) {
        ctx.diagnostic(RegExpFlagUAndV(lit.span));
    }
}