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use super::util::Scope;
use swc_atoms::js_word;
use swc_common::DUMMY_SP;
use swc_ecma_ast::*;
use swc_ecma_visit::{noop_fold_type, Fold, Node, Visit};
pub fn import_analyzer() -> impl Fold {
ImportAnalyzer {
scope: Default::default(),
}
}
struct ImportAnalyzer {
scope: Scope,
}
impl Fold for ImportAnalyzer {
noop_fold_type!();
fn fold_module(&mut self, module: Module) -> Module {
self.visit_module(&module, &Invalid { span: DUMMY_SP } as _);
for (_, ty) in self.scope.import_types.drain() {
if ty {
enable_helper!(interop_require_wildcard);
} else {
enable_helper!(interop_require_default);
}
}
module
}
}
impl Visit for ImportAnalyzer {
noop_visit_type!();
fn visit_export_all(&mut self, export: &ExportAll, _parent: &dyn Node) {
*self
.scope
.import_types
.entry(export.src.value.clone())
.or_default() = true
}
fn visit_import_decl(&mut self, import: &ImportDecl, _parent: &dyn Node) {
if import.specifiers.is_empty() {
} else if import.specifiers.len() == 1
&& match import.specifiers[0] {
ImportSpecifier::Namespace(..) => true,
_ => false,
}
{
if &*import.src.value != "@swc/helpers" {
self.scope
.import_types
.insert(import.src.value.clone(), true);
}
} else {
for s in &import.specifiers {
match *s {
ImportSpecifier::Namespace(..) => unreachable!(
"import * as foo cannot be used with other type of import specifiers"
),
ImportSpecifier::Default(_) => {
self.scope
.import_types
.entry(import.src.value.clone())
.or_insert(false);
}
ImportSpecifier::Named(ref i) => {
let ImportNamedSpecifier {
ref local,
ref imported,
..
} = *i;
let name = imported
.as_ref()
.map(|i| i.sym.clone())
.unwrap_or_else(|| local.sym.clone());
let is_default = name == js_word!("default");
if is_default {
self.scope
.import_types
.entry(import.src.value.clone())
.or_insert(false);
} else {
self.scope
.import_types
.entry(import.src.value.clone())
.and_modify(|v| *v = true);
}
}
}
}
}
}
fn visit_named_export(&mut self, export: &NamedExport, _parent: &dyn Node) {
for &ExportNamedSpecifier { ref orig, .. } in export.specifiers.iter().map(|e| match *e {
ExportSpecifier::Named(ref e) => e,
_ => unreachable!("export default from 'foo'; should be removed by previous pass"),
}) {
let is_import_default = orig.sym == js_word!("default");
if let Some(ref src) = export.src {
if is_import_default {
self.scope
.import_types
.entry(src.value.clone())
.or_insert(false);
} else {
self.scope
.import_types
.entry(src.value.clone())
.and_modify(|v| *v = true);
}
}
}
}
}