feat(codegen): implement the basics of non-minifying codegen (#987)

crates/oxc_ast/src/ast/js.rs

@@ -1465,7 +1465,9 @@ pub struct Function<'a> {
 
 impl<'a> Function<'a> {
  pub fn is_typescript_syntax(&self) -> bool {
- self.modifiers.contains(ModifierKind::Declare) || self.body.is_none()
+ self.r#type == FunctionType::TSDeclareFunction
+ || self.body.is_none()
+ || self.modifiers.contains(ModifierKind::Declare)
  }
 
  pub fn is_expression(&self) -> bool {
@@ -1939,6 +1941,12 @@ pub struct ExportDefaultDeclaration<'a> {
  pub exported: ModuleExportName, // `default`
 }
 
+impl<'a> ExportDefaultDeclaration<'a> {
+ pub fn is_typescript_syntax(&self) -> bool {
+ self.declaration.is_typescript_syntax()
+ }
+}
+
 #[derive(Debug, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize), serde(tag = "type"))]
 pub struct ExportAllDeclaration<'a> {
@@ -1950,6 +1958,12 @@ pub struct ExportAllDeclaration<'a> {
  pub export_kind: ImportOrExportKind, // `export type *`
 }
 
+impl<'a> ExportAllDeclaration<'a> {
+ pub fn is_typescript_syntax(&self) -> bool {
+ self.export_kind.is_type()
+ }
+}
+
 #[derive(Debug, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize), serde(tag = "type"))]
 pub struct ExportSpecifier {

crates/oxc_codegen/examples/codegen.rs

@@ -10,7 +10,7 @@ use oxc_span::SourceType;
 // 2. run `cargo run -p oxc_codegen --example codegen` or `just example codegen`
 
 fn main() {
- let name = env::args().nth(1).unwrap_or_else(|| "test.js".to_string());
+ let name = env::args().nth(1).unwrap_or_else(|| "test.ts".to_string());
  let path = Path::new(&name);
  let source_text = std::fs::read_to_string(path).unwrap_or_else(|_| panic!("{name} not found"));
  let source_type = SourceType::from_path(path).unwrap();
@@ -26,11 +26,10 @@ fn main() {
  }
 
  let codegen_options = CodegenOptions;
- let minified = Codegen::<true>::new(source_text.len(), codegen_options).build(&ret.program);
- println!("Minified:");
- println!("{minified}");
+ let printed = Codegen::<false>::new(source_text.len(), codegen_options).build(&ret.program);
+ println!("{printed}");
 
+ let ret = Parser::new(&allocator, &printed, source_type).parse();
  let printed = Codegen::<false>::new(source_text.len(), codegen_options).build(&ret.program);
- println!("Printed:");
  println!("{printed}");
 }