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//! Rewrite default export to a variable declaration.
//!
//! This module transforms `export default` declarations to variable declarations,
//! allowing the compiler to inject properties like render functions.
use oxc_allocator::Allocator;
use oxc_ast::ast::{ExportDefaultDeclarationKind, Statement};
use oxc_parser::Parser;
use oxc_span::{GetSpan, SourceType};
use vize_carton::{String, ToCompactString};
/// Rewrite `export default` to a const declaration with the given name.
/// Returns (rewritten_code, has_default_export)
pub fn rewrite_default(input: &str, as_name: &str, is_ts: bool) -> (String, bool) {
let source_type = if is_ts {
SourceType::ts()
} else {
SourceType::mjs()
};
let allocator = Allocator::default();
let ret = Parser::new(&allocator, input, source_type).parse();
if !ret.errors.is_empty() {
// If parsing fails, return original code
return (input.to_compact_string(), false);
}
let program = ret.program;
// Check if there's a default export
let has_default = program.body.iter().any(|stmt| {
matches!(stmt, Statement::ExportDefaultDeclaration(_))
|| matches!(stmt, Statement::ExportNamedDeclaration(decl)
if decl.specifiers.iter().any(|s| {
matches!(&s.exported, oxc_ast::ast::ModuleExportName::IdentifierName(name) if name.name == "default")
|| matches!(&s.exported, oxc_ast::ast::ModuleExportName::IdentifierReference(name) if name.name == "default")
}))
});
if !has_default {
// No default export - append empty object
let mut output = input.to_compact_string();
output.push_str("\nconst ");
output.push_str(as_name);
output.push_str(" = {}");
return (output, false);
}
// Find and rewrite the default export
let mut output = String::default();
let mut last_end = 0;
for stmt in program.body.iter() {
match stmt {
Statement::ExportDefaultDeclaration(decl) => {
// Copy everything before this statement
output.push_str(&input[last_end..decl.span.start as usize]);
match &decl.declaration {
ExportDefaultDeclarationKind::ClassDeclaration(class_decl) => {
// export default class Foo {} -> class Foo {} \n const as_name = Foo
if let Some(id) = &class_decl.id {
output.push_str("class ");
output.push_str(id.name.as_str());
// Copy the rest of the class declaration
let class_body_start = id.span.end as usize;
let class_body = &input[class_body_start..decl.span.end as usize];
output.push_str(class_body);
output.push_str("\nconst ");
output.push_str(as_name);
output.push_str(" = ");
output.push_str(id.name.as_str());
} else {
// Anonymous class - wrap in const
output.push_str("const ");
output.push_str(as_name);
output.push_str(" = ");
let class_start = class_decl.span.start as usize;
output.push_str(&input[class_start..decl.span.end as usize]);
}
}
ExportDefaultDeclarationKind::FunctionDeclaration(func_decl) => {
// export default function foo() {} -> function foo() {} \n const as_name = foo
if let Some(id) = &func_decl.id {
output.push_str("function ");
output.push_str(id.name.as_str());
// Copy the rest of the function
let func_body_start = id.span.end as usize;
let func_body = &input[func_body_start..decl.span.end as usize];
output.push_str(func_body);
output.push_str("\nconst ");
output.push_str(as_name);
output.push_str(" = ");
output.push_str(id.name.as_str());
} else {
// Anonymous function - wrap in const
output.push_str("const ");
output.push_str(as_name);
output.push_str(" = ");
let func_start = func_decl.span.start as usize;
output.push_str(&input[func_start..decl.span.end as usize]);
}
}
_ => {
// export default {...} -> const as_name = {...}
output.push_str("const ");
output.push_str(as_name);
output.push_str(" = ");
let expr_start = decl.declaration.span().start as usize;
let expr_end = decl.declaration.span().end as usize;
output.push_str(&input[expr_start..expr_end]);
}
}
last_end = decl.span.end as usize;
}
Statement::ExportNamedDeclaration(named_decl) => {
// Handle: export { foo as default }
let has_default_specifier = named_decl.specifiers.iter().any(|s| {
matches!(&s.exported, oxc_ast::ast::ModuleExportName::IdentifierName(name) if name.name == "default")
|| matches!(&s.exported, oxc_ast::ast::ModuleExportName::IdentifierReference(name) if name.name == "default")
});
if has_default_specifier {
// Copy everything before this statement
output.push_str(&input[last_end..named_decl.span.start as usize]);
if let Some(source) = &named_decl.source {
// export { default } from '...' or export { foo as default } from '...'
for specifier in &named_decl.specifiers {
let is_default = matches!(&specifier.exported,
oxc_ast::ast::ModuleExportName::IdentifierName(name) if name.name == "default")
|| matches!(&specifier.exported,
oxc_ast::ast::ModuleExportName::IdentifierReference(name) if name.name == "default");
if is_default {
let local_name = match &specifier.local {
oxc_ast::ast::ModuleExportName::IdentifierName(name) => {
name.name.as_str()
}
oxc_ast::ast::ModuleExportName::IdentifierReference(name) => {
name.name.as_str()
}
_ => "default",
};
// Add import for the default
output.push_str("import { ");
output.push_str(local_name);
output.push_str(" as __VUE_DEFAULT__ } from '");
output.push_str(source.value.as_str());
output.push_str("'\n");
}
}
// Rebuild export without the default specifier
let other_specifiers: Vec<_> = named_decl
.specifiers
.iter()
.filter(|s| {
!matches!(&s.exported,
oxc_ast::ast::ModuleExportName::IdentifierName(name) if name.name == "default")
&& !matches!(&s.exported,
oxc_ast::ast::ModuleExportName::IdentifierReference(name) if name.name == "default")
})
.collect();
if !other_specifiers.is_empty() {
output.push_str("export { ");
for (i, spec) in other_specifiers.iter().enumerate() {
if i > 0 {
output.push_str(", ");
}
let local = match &spec.local {
oxc_ast::ast::ModuleExportName::IdentifierName(name) => {
name.name.as_str()
}
oxc_ast::ast::ModuleExportName::IdentifierReference(name) => {
name.name.as_str()
}
_ => continue,
};
let exported = match &spec.exported {
oxc_ast::ast::ModuleExportName::IdentifierName(name) => {
name.name.as_str()
}
oxc_ast::ast::ModuleExportName::IdentifierReference(name) => {
name.name.as_str()
}
_ => continue,
};
if local == exported {
output.push_str(local);
} else {
output.push_str(local);
output.push_str(" as ");
output.push_str(exported);
}
}
output.push_str(" } from '");
output.push_str(source.value.as_str());
output.push_str("'\n");
}
output.push_str("const ");
output.push_str(as_name);
output.push_str(" = __VUE_DEFAULT__");
} else {
// export { foo as default } (no source)
for specifier in &named_decl.specifiers {
let is_default = matches!(&specifier.exported,
oxc_ast::ast::ModuleExportName::IdentifierName(name) if name.name == "default")
|| matches!(&specifier.exported,
oxc_ast::ast::ModuleExportName::IdentifierReference(name) if name.name == "default");
if is_default {
let local_name = match &specifier.local {
oxc_ast::ast::ModuleExportName::IdentifierName(name) => {
name.name.as_str()
}
oxc_ast::ast::ModuleExportName::IdentifierReference(name) => {
name.name.as_str()
}
_ => "default",
};
// Rebuild export without the default specifier
let other_specifiers: Vec<_> = named_decl
.specifiers
.iter()
.filter(|s| {
!matches!(&s.exported,
oxc_ast::ast::ModuleExportName::IdentifierName(name) if name.name == "default")
&& !matches!(&s.exported,
oxc_ast::ast::ModuleExportName::IdentifierReference(name) if name.name == "default")
})
.collect();
if !other_specifiers.is_empty() {
output.push_str("export { ");
for (i, spec) in other_specifiers.iter().enumerate() {
if i > 0 {
output.push_str(", ");
}
let local = match &spec.local {
oxc_ast::ast::ModuleExportName::IdentifierName(
name,
) => name.name.as_str(),
oxc_ast::ast::ModuleExportName::IdentifierReference(
name,
) => name.name.as_str(),
_ => continue,
};
let exported = match &spec.exported {
oxc_ast::ast::ModuleExportName::IdentifierName(
name,
) => name.name.as_str(),
oxc_ast::ast::ModuleExportName::IdentifierReference(
name,
) => name.name.as_str(),
_ => continue,
};
if local == exported {
output.push_str(local);
} else {
output.push_str(local);
output.push_str(" as ");
output.push_str(exported);
}
}
output.push_str(" }\n");
}
output.push_str("const ");
output.push_str(as_name);
output.push_str(" = ");
output.push_str(local_name);
break;
}
}
}
last_end = named_decl.span.end as usize;
}
}
_ => {}
}
}
// Copy remaining content
if last_end < input.len() {
output.push_str(&input[last_end..]);
}
(output, has_default)
}
#[cfg(test)]
mod tests {
use super::rewrite_default;
#[test]
fn test_rewrite_default_object() {
let (result, has_default) = rewrite_default("export default {}", "_sfc_main", false);
assert!(has_default);
assert!(result.contains("const _sfc_main = {}"));
assert!(!result.contains("export default"));
}
#[test]
fn test_rewrite_default_with_other_code() {
let input = r#"
import { ref } from 'vue'
const count = ref(0)
export default {
name: 'MyComponent'
}
"#;
let (result, has_default) = rewrite_default(input, "_sfc_main", false);
assert!(has_default);
assert!(result.contains("const _sfc_main = {"));
assert!(result.contains("name: 'MyComponent'"));
assert!(!result.contains("export default"));
}
#[test]
fn test_rewrite_default_class() {
let (result, has_default) =
rewrite_default("export default class Foo {}", "_sfc_main", false);
assert!(has_default);
assert!(result.contains("class Foo {}"));
assert!(result.contains("const _sfc_main = Foo"));
}
#[test]
fn test_no_default_export() {
let (result, has_default) = rewrite_default("export const a = {}", "_sfc_main", false);
assert!(!has_default);
assert!(result.contains("const _sfc_main = {}"));
}
#[test]
fn test_named_default_export() {
let input = "const a = 1\nexport { a as default }";
let (result, has_default) = rewrite_default(input, "_sfc_main", false);
assert!(has_default);
assert!(result.contains("const _sfc_main = a"));
}
}