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use swc_common::{util::take::Take, DUMMY_SP};
use swc_ecma_ast::*;
use swc_ecma_utils::IdentExt;
use swc_ecma_visit::{as_folder, noop_visit_mut_type, Fold, VisitMut};
pub fn export_default_from() -> impl Fold + VisitMut {
as_folder(ExportDefaultFrom)
}
struct ExportDefaultFrom;
impl VisitMut for ExportDefaultFrom {
noop_visit_mut_type!();
fn visit_mut_module_items(&mut self, items: &mut Vec<ModuleItem>) {
let mut stmts = Vec::with_capacity(items.len() + 4);
let mut extra_stmts = Vec::with_capacity(items.len() + 4);
for item in items.take() {
match item {
ModuleItem::ModuleDecl(ModuleDecl::ExportNamed(mut export)) => {
if export.specifiers.iter().all(|s| match *s {
ExportSpecifier::Named(..) | ExportSpecifier::Namespace(..) => true,
_ => false,
}) {
extra_stmts.push(ModuleItem::ModuleDecl(ModuleDecl::ExportNamed(export)));
continue;
}
match export.specifiers.remove(0) {
ExportSpecifier::Default(ExportDefaultSpecifier { exported: default }) => {
let local = default.prefix("_").private();
stmts.push(ModuleItem::ModuleDecl(ModuleDecl::Import(ImportDecl {
span: DUMMY_SP,
specifiers: vec![ImportSpecifier::Default(
ImportDefaultSpecifier {
span: DUMMY_SP,
local: local.clone(),
},
)],
src: export
.src
.clone()
.expect("`export default from` requires source"),
type_only: false,
asserts: None,
})));
extra_stmts.push(ModuleItem::ModuleDecl(ModuleDecl::ExportNamed(
NamedExport {
span: DUMMY_SP,
specifiers: vec![ExportSpecifier::Named(
ExportNamedSpecifier {
span: DUMMY_SP,
orig: local,
exported: Some(default),
is_type_only: false,
},
)],
src: None,
type_only: false,
asserts: None,
},
)));
}
_ => unreachable!(),
};
if !export.specifiers.is_empty() {
extra_stmts.push(ModuleItem::ModuleDecl(ModuleDecl::ExportNamed(export)));
}
}
ModuleItem::ModuleDecl(ModuleDecl::Import(..)) => stmts.push(item),
_ => extra_stmts.push(item),
}
}
stmts.append(&mut extra_stmts);
*items = stmts;
}
}