feat(codegen)!: new code gen API (#3740)

This PR introduces two type alias to avoid the confusing const generic `pub struct Codegen<'a, const MINIFY: bool>`

* CodeGenerator - Code generator without whitespace removal.
* WhitespaceRemover - Code generator with whitespace removal.

Usage is changed to a builder pattern:

```rust
CodeGenerator::new()
  .enable_comment(...)
  .enable_sourcemap(...)
  .build(&program);
```

crates/oxc_codegen/examples/codegen.rs

@@ -2,7 +2,7 @@
 use std::{env, path::Path};
 
 use oxc_allocator::Allocator;
-use oxc_codegen::{Codegen, CodegenOptions};
+use oxc_codegen::{CodeGenerator, WhitespaceRemover};
 use oxc_parser::Parser;
 use oxc_span::SourceType;
 
@@ -29,16 +29,11 @@ fn main() -> std::io::Result<()> {
     println!("Original:");
     println!("{source_text}");
 
-    let options = CodegenOptions::default();
-    let printed = Codegen::<false>::new("", &source_text, ret.trivias.clone(), options)
-        .build(&ret.program)
-        .source_text;
+    let printed = CodeGenerator::new().build(&ret.program).source_text;
     println!("Printed:");
     println!("{printed}");
 
-    let minified = Codegen::<true>::new("", &source_text, ret.trivias, options)
-        .build(&ret.program)
-        .source_text;
+    let minified = WhitespaceRemover::new().build(&ret.program).source_text;
     println!("Minified:");
     println!("{minified}");
 

crates/oxc_codegen/examples/sourcemap.rs

@@ -3,7 +3,7 @@ use std::{env, path::Path};
 
 use base64::{prelude::BASE64_STANDARD, Engine};
 use oxc_allocator::Allocator;
-use oxc_codegen::{Codegen, CodegenOptions, CodegenReturn};
+use oxc_codegen::{CodeGenerator, CodegenReturn};
 use oxc_parser::Parser;
 use oxc_span::SourceType;
 
@@ -27,15 +27,9 @@ fn main() -> std::io::Result<()> {
         return Ok(());
     }
 
-    let codegen_options = CodegenOptions { enable_source_map: true, ..Default::default() };
-
-    let CodegenReturn { source_text, source_map } = Codegen::<false>::new(
-        path.to_string_lossy().as_ref(),
-        &source_text,
-        ret.trivias,
-        codegen_options,
-    )
-    .build(&ret.program);
+    let CodegenReturn { source_text, source_map } = CodeGenerator::new()
+        .enable_source_map(path.to_string_lossy().as_ref(), &source_text)
+        .build(&ret.program);
 
     if let Some(source_map) = source_map {
         let result = source_map.to_json_string().unwrap();

crates/oxc_codegen/src/annotation_comment.rs

@@ -55,7 +55,7 @@ pub fn print_comment<const MINIFY: bool>(
 }
 
 pub fn gen_comment<const MINIFY: bool>(node_start: u32, codegen: &mut Codegen<{ MINIFY }>) {
-    if !codegen.options.preserve_annotate_comments {
+    if !codegen.comment_options.preserve_annotate_comments {
         return;
     }
     if let Some((comment_start, comment)) = codegen.try_take_moved_comment(node_start) {

crates/oxc_codegen/src/gen.rs

@@ -11,7 +11,7 @@ use oxc_syntax::{
 };
 
 use crate::annotation_comment::{gen_comment, get_leading_annotate_comment};
-use crate::{Codegen, Context, Operator, Separator};
+use crate::{Codegen, Context, Operator};
 
 pub trait Gen<const MINIFY: bool> {
     fn gen(&self, _p: &mut Codegen<{ MINIFY }>, _ctx: Context) {}
@@ -591,7 +591,7 @@ impl<'a, const MINIFY: bool> Gen<MINIFY> for VariableDeclaration<'a> {
             p.print_str(b"declare ");
         }
 
-        if p.options.preserve_annotate_comments
+        if p.comment_options.preserve_annotate_comments
             && matches!(self.kind, VariableDeclarationKind::Const)
         {
             if let Some(declarator) = self.declarations.first() {
@@ -823,7 +823,9 @@ impl<'a, const MINIFY: bool> Gen<MINIFY> for WithClause<'a> {
         p.add_source_mapping(self.span.start);
         self.attributes_keyword.gen(p, ctx);
         p.print_soft_space();
-        p.print_block(&self.with_entries, Separator::Comma, ctx, self.span);
+        p.print_block_start(self.span.start);
+        p.print_sequence(&self.with_entries, ctx);
+        p.print_block_end(self.span.end);
     }
 }
 
@@ -845,7 +847,7 @@ impl<'a, const MINIFY: bool> Gen<MINIFY> for ExportNamedDeclaration<'a> {
     fn gen(&self, p: &mut Codegen<{ MINIFY }>, ctx: Context) {
         p.add_source_mapping(self.span.start);
         p.print_indent();
-        if p.options.preserve_annotate_comments {
+        if p.comment_options.preserve_annotate_comments {
             match &self.declaration {
                 Some(Declaration::FunctionDeclaration(_)) => {
                     gen_comment(self.span.start, p);