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113 lines
3.1 KiB
Rust
113 lines
3.1 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use deno_ast::swc::ast::ExportDefaultDecl;
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use deno_ast::swc::ast::ExportSpecifier;
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use deno_ast::swc::ast::ModuleExportName;
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use deno_ast::swc::ast::NamedExport;
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use deno_ast::swc::ast::Program;
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use deno_ast::swc::visit::noop_visit_type;
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use deno_ast::swc::visit::Visit;
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use deno_ast::swc::visit::VisitWith;
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use deno_ast::ParsedSource;
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/// Gets if the parsed source has a default export.
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pub fn has_default_export(source: &ParsedSource) -> bool {
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let mut visitor = DefaultExportFinder {
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has_default_export: false,
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};
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let program = source.program();
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let program: &Program = &program;
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program.visit_with(&mut visitor);
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visitor.has_default_export
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}
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struct DefaultExportFinder {
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has_default_export: bool,
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}
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impl Visit for DefaultExportFinder {
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noop_visit_type!();
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fn visit_export_default_decl(&mut self, _: &ExportDefaultDecl) {
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self.has_default_export = true;
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}
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fn visit_named_export(&mut self, named_export: &NamedExport) {
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if named_export
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.specifiers
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.iter()
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.any(export_specifier_has_default)
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{
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self.has_default_export = true;
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}
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}
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}
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fn export_specifier_has_default(s: &ExportSpecifier) -> bool {
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match s {
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ExportSpecifier::Default(_) => true,
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ExportSpecifier::Namespace(_) => false,
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ExportSpecifier::Named(named) => {
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let export_name = named.exported.as_ref().unwrap_or(&named.orig);
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match export_name {
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ModuleExportName::Str(_) => false,
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ModuleExportName::Ident(ident) => &*ident.sym == "default",
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}
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}
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}
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}
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#[cfg(test)]
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mod test {
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use deno_ast::MediaType;
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use deno_ast::ParseParams;
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use deno_ast::ParsedSource;
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use deno_ast::SourceTextInfo;
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use super::has_default_export;
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#[test]
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fn has_default_when_export_default_decl() {
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let parsed_source = parse_module("export default class Class {}");
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assert!(has_default_export(&parsed_source));
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}
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#[test]
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fn has_default_when_named_export() {
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let parsed_source = parse_module("export {default} from './test.ts';");
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assert!(has_default_export(&parsed_source));
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}
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#[test]
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fn has_default_when_named_export_alias() {
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let parsed_source =
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parse_module("export {test as default} from './test.ts';");
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assert!(has_default_export(&parsed_source));
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}
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#[test]
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fn not_has_default_when_named_export_not_exported() {
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let parsed_source =
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parse_module("export {default as test} from './test.ts';");
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assert!(!has_default_export(&parsed_source));
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}
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#[test]
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fn not_has_default_when_not() {
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let parsed_source = parse_module("export {test} from './test.ts'; export class Test{} export * from './test';");
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assert!(!has_default_export(&parsed_source));
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}
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fn parse_module(text: &str) -> ParsedSource {
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deno_ast::parse_module(ParseParams {
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specifier: "file:///mod.ts".to_string(),
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capture_tokens: false,
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maybe_syntax: None,
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media_type: MediaType::TypeScript,
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scope_analysis: false,
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text_info: SourceTextInfo::from_string(text.to_string()),
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})
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.unwrap()
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}
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}
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