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//! Export declaration handling for JS/TS AST analysis.
//!
//! This module handles parsing of export declarations including:
//! - Named exports: `export const x = 1;`, `export function foo() {}`
//! - Default exports: `export default class MyClass {}`
//! - Re-exports: `export { foo } from './bar'`, `export * from './module'`
//! - TypeScript-specific: interfaces, type aliases, enums
//!
//! VibeCrafted with AI Agents (c)2026 Loctree Team
use oxc_ast::ast::*;
use oxc_ast_visit::Visit;
use crate::types::{ExportSymbol, ReexportEntry, ReexportKind};
// Note: Visit trait is imported for use in handle_ methods that need to call
// visitor methods like visit_variable_declaration, visit_function_body, visit_class
use super::visitor::JsVisitor;
impl<'a> JsVisitor<'a> {
/// Handle named export declaration.
///
/// Supports:
/// - Re-exports: `export { foo } from 'bar'`
/// - Variable exports: `export const x = 1;`
/// - Function exports: `export function foo() {}`
/// - Class exports: `export class MyClass {}`
/// - TypeScript exports: interfaces, types, enums
/// - Named specifier exports: `export { foo };`
pub(super) fn handle_export_named_declaration(&mut self, decl: &ExportNamedDeclaration<'a>) {
let line = self.get_line(decl.span);
if let Some(src) = &decl.source {
// Re-export: export { foo } from 'bar' or export { foo as bar } from 'baz'
let source = src.value.to_string();
let resolved = self.resolve_path(&source);
let mut names: Vec<(String, String)> = Vec::new();
for spec in &decl.specifiers {
// local = name in source module
let local_name = match &spec.local {
ModuleExportName::IdentifierName(id) => id.name.to_string(),
ModuleExportName::IdentifierReference(id) => id.name.to_string(),
ModuleExportName::StringLiteral(str) => str.value.to_string(),
};
// exported = name as exported (may be aliased)
let exported_name = match &spec.exported {
ModuleExportName::IdentifierName(id) => id.name.to_string(),
ModuleExportName::IdentifierReference(id) => id.name.to_string(),
ModuleExportName::StringLiteral(str) => str.value.to_string(),
};
names.push((local_name, exported_name));
}
self.analysis.reexports.push(ReexportEntry {
source,
kind: ReexportKind::Named(names.clone()),
resolved,
});
// Also track as exports (use exported name, not local)
for (_, exported_name) in &names {
self.analysis.exports.push(ExportSymbol::new(
exported_name.clone(),
"reexport",
"named",
Some(line),
));
}
} else {
// Named export: export const x = 1;
if let Some(declaration) = &decl.declaration {
match declaration {
Declaration::VariableDeclaration(var) => {
for d in &var.declarations {
if let BindingPattern::BindingIdentifier(id) = &d.id {
let name = id.name.to_string();
// Check if it's a function expression or arrow function
if let Some(init) = &d.init {
if let Expression::FunctionExpression(fun) = init {
let params = self.extract_function_params(fun);
self.analysis.exports.push(ExportSymbol::with_params(
name,
"function",
"named",
Some(line),
params,
));
self.record_function_signature(id.name.as_str(), fun);
} else if let Expression::ArrowFunctionExpression(fun) = init {
let params = self.extract_arrow_params(fun);
self.analysis.exports.push(ExportSymbol::with_params(
name,
"function",
"named",
Some(line),
params,
));
self.record_arrow_signature(id.name.as_str(), fun);
} else {
self.analysis.exports.push(ExportSymbol::new(
name,
"var",
"named",
Some(line),
));
}
} else {
self.analysis.exports.push(ExportSymbol::new(
name,
"var",
"named",
Some(line),
));
}
}
}
// Continue traversal
self.visit_variable_declaration(var);
}
Declaration::FunctionDeclaration(f) => {
if let Some(id) = &f.id {
let name = id.name.to_string();
let params = self.extract_function_params(f);
self.analysis.exports.push(ExportSymbol::with_params(
name,
"function",
"named",
Some(line),
params,
));
self.record_function_signature(id.name.as_str(), f);
}
// Continue traversal
if let Some(body) = &f.body {
self.visit_function_body(body);
}
}
Declaration::ClassDeclaration(c) => {
if let Some(id) = &c.id {
let name = id.name.to_string();
self.analysis.exports.push(ExportSymbol::new(
name,
"class",
"named",
Some(line),
));
}
// Continue traversal
self.visit_class(c);
}
Declaration::TSInterfaceDeclaration(i) => {
let name = i.id.name.to_string();
self.analysis.exports.push(ExportSymbol::new(
name,
"interface",
"named",
Some(line),
));
}
Declaration::TSTypeAliasDeclaration(t) => {
let name = t.id.name.to_string();
self.analysis.exports.push(ExportSymbol::new(
name,
"type",
"named",
Some(line),
));
}
Declaration::TSEnumDeclaration(e) => {
let name = e.id.name.to_string();
self.analysis.exports.push(ExportSymbol::new(
name,
"enum",
"named",
Some(line),
));
}
_ => {}
}
}
// export { foo };
for spec in &decl.specifiers {
let name = match &spec.exported {
ModuleExportName::IdentifierName(id) => id.name.to_string(),
ModuleExportName::IdentifierReference(id) => id.name.to_string(),
ModuleExportName::StringLiteral(str) => str.value.to_string(),
};
self.analysis
.exports
.push(ExportSymbol::new(name, "named", "named", Some(line)));
}
}
}
/// Handle default export declaration.
///
/// Default exports are always named "default" for matching with `import X from './file'`.
/// The actual function/class name is stored in export_type for debugging.
pub(super) fn handle_export_default_declaration(
&mut self,
decl: &ExportDefaultDeclaration<'a>,
) {
let line = self.get_line(decl.span);
match &decl.declaration {
ExportDefaultDeclarationKind::FunctionDeclaration(f) => {
let original_name = f.id.as_ref().map(|i| i.name.to_string());
let params = self.extract_function_params(f);
self.analysis.exports.push(ExportSymbol::with_params(
"default".to_string(),
"default",
original_name.as_deref().unwrap_or("default"),
Some(line),
params,
));
if let Some(name) = &original_name {
self.record_function_signature(name, f);
}
// Continue traversal
if let Some(body) = &f.body {
self.visit_function_body(body);
}
}
ExportDefaultDeclarationKind::ClassDeclaration(c) => {
let original_name = c.id.as_ref().map(|i| i.name.to_string());
self.analysis.exports.push(ExportSymbol::new(
"default".to_string(),
"default",
original_name.as_deref().unwrap_or("default"),
Some(line),
));
// Continue traversal
self.visit_class(c);
}
ExportDefaultDeclarationKind::TSInterfaceDeclaration(i) => {
self.analysis.exports.push(ExportSymbol::new(
"default".to_string(),
"default",
&i.id.name,
Some(line),
));
// Interfaces don't have executable code bodies (calls), so no need to traverse deep for commands
}
_ => {
self.analysis.exports.push(ExportSymbol::new(
"default".to_string(),
"default",
"default",
Some(line),
));
}
};
}
/// Handle star re-export: `export * from './module'`
pub(super) fn handle_export_all_declaration(&mut self, decl: &ExportAllDeclaration<'a>) {
let source = decl.source.value.to_string();
let resolved = self.resolve_path(&source);
self.analysis.reexports.push(ReexportEntry {
source,
kind: ReexportKind::Star,
resolved,
});
}
}