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use super::Context;
use super::LintRule;
use crate::swc_ecma_ast;
use crate::swc_ecma_ast::VarDecl;
use swc_ecma_visit::Node;
use swc_ecma_visit::Visit;
pub struct SingleVarDeclarator;
impl LintRule for SingleVarDeclarator {
fn new() -> Box<Self> {
Box::new(SingleVarDeclarator)
}
fn code(&self) -> &'static str {
"single-var-declarator"
}
fn lint_module(&self, context: Context, module: swc_ecma_ast::Module) {
let mut visitor = SingleVarDeclaratorVisitor::new(context);
visitor.visit_module(&module, &module);
}
}
struct SingleVarDeclaratorVisitor {
context: Context,
}
impl SingleVarDeclaratorVisitor {
pub fn new(context: Context) -> Self {
Self { context }
}
}
impl Visit for SingleVarDeclaratorVisitor {
fn visit_var_decl(&mut self, var_decl: &VarDecl, _parent: &dyn Node) {
if var_decl.decls.len() > 1 {
self.context.add_diagnostic(
var_decl.span,
"single-var-declarator",
"Multiple variable declarators are not allowed",
);
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_util::*;
#[test]
fn single_var_declarator_test() {
assert_lint_err::<SingleVarDeclarator>(
r#"const a1 = "a", b1 = "b", c1 = "c";"#,
0,
);
assert_lint_err::<SingleVarDeclarator>(
r#"let a2 = "a", b2 = "b", c2 = "c";"#,
0,
);
assert_lint_err::<SingleVarDeclarator>(
r#"var a3 = "a", b3 = "b", c3 = "c";"#,
0,
);
}
}