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fix(es/lints): Disallow duplicate export functions (#5234)

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Austaras 2022-07-17 18:09:29 +08:00 committed by GitHub
parent 9616d760a2
commit c68d484305
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3 changed files with 75 additions and 10 deletions
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4
crates/swc/tests/errors/lints/duplicate-bindings/function/3/input.js Normal file
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@ -0,0 +1,4 @@
export function foo() {}
export default function foo() {}
function foo() {}

22
crates/swc/tests/errors/lints/duplicate-bindings/function/3/output.swc-stderr Normal file
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@ -0,0 +1,22 @@
x the name `foo` is defined multiple times
,-[1:1]
1 | export function foo() {}
: ^|^
: `-- previous definition of `foo` here
2 | export default function foo() {}
: ^|^
: `-- `foo` redefined here
`----
x the name `foo` is defined multiple times
,-[1:1]
1 | export function foo() {}
: ^|^
: `-- previous definition of `foo` here
2 | export default function foo() {}
3 |
4 | function foo() {}
: ^|^
: `-- `foo` redefined here
`----

59
crates/swc_ecma_lints/src/rules/duplicate_bindings.rs
View File

@ -7,7 +7,6 @@ use swc_common::{
Span,
};
use swc_ecma_ast::*;
use swc_ecma_utils::StmtLike;
use swc_ecma_visit::{noop_visit_type, Visit, VisitWith};
use crate::rule::{visitor_rule, Rule};
@ -84,15 +83,14 @@ impl DuplicateBindings {
// this is for the wired case:
// in non strict mode, function in non top level or function scope
// is hoisted, while still error when collides with same level lexical var
fn visit_with_stmt_like<T: StmtLike + VisitWith<Self>>(&mut self, s: &[T]) {
fn visit_with_stmt_like<T: VisitWith<Self>, F: Fn(&T) -> Option<Ident>>(
&mut self,
s: &[T],
get_fn_ident: F,
) {
let mut fn_name = AHashMap::default();
for s in s {
if let Some(Stmt::Decl(Decl::Fn(FnDecl {
ident,
function: Function { body: Some(_), .. },
..
}))) = s.as_stmt()
{
if let Some(ident) = get_fn_ident(s) {
if let Some(prev) = fn_name.get(&ident.sym) {
emit_error(&ident.sym, ident.span, *prev)
} else {
@ -109,7 +107,18 @@ impl DuplicateBindings {
self.lexical_function = lexical_function;
if lexical_function {
self.visit_with_stmt_like(s);
self.visit_with_stmt_like(s, |s| {
if let Stmt::Decl(Decl::Fn(FnDecl {
ident,
function: Function { body: Some(_), .. },
..
})) = s
{
Some(ident.clone())
} else {
None
}
});
} else {
s.visit_children_with(self);
}
@ -299,7 +308,37 @@ impl Visit for DuplicateBindings {
self.lexical_function = true;
self.visit_with_stmt_like(&m.body);
self.visit_with_stmt_like(&m.body, |s| {
if let ModuleItem::Stmt(Stmt::Decl(Decl::Fn(FnDecl {
ident,
function: Function { body: Some(_), .. },
..
})))
| ModuleItem::ModuleDecl(
ModuleDecl::ExportDecl(ExportDecl {
decl:
Decl::Fn(FnDecl {
ident,
function: Function { body: Some(_), .. },
..
}),
..
})
| ModuleDecl::ExportDefaultDecl(ExportDefaultDecl {
decl:
DefaultDecl::Fn(FnExpr {
ident: Some(ident),
function: Function { body: Some(..), .. },
}),
..
}),
) = s
{
Some(ident.clone())
} else {
None
}
});
}
fn visit_pat(&mut self, p: &Pat) {