denoland-deno/cli/tools/lint/ast.rs

use deno_ast::{
  swc::{
    ast::{
      AssignTarget, AssignTargetPat, BlockStmtOrExpr, Callee, ClassMember,
      Decl, ExportSpecifier, Expr, ExprOrSpread, FnExpr, ForHead, Function,
      Ident, IdentName, JSXAttrName, JSXAttrOrSpread, JSXAttrValue, JSXElement,
      JSXElementChild, JSXElementName, JSXEmptyExpr, JSXExpr, JSXExprContainer,
      JSXFragment, JSXMemberExpr, JSXNamespacedName, JSXObject,
      JSXOpeningElement, Lit, MemberProp, ModuleDecl, ModuleExportName,
      ModuleItem, ObjectPatProp, Param, ParamOrTsParamProp, Pat, Program, Prop,
      PropName, PropOrSpread, SimpleAssignTarget, Stmt, SuperProp, TsType,
      VarDeclOrExpr,
    },
    common::{Span, Spanned, SyntaxContext, DUMMY_SP},
  },
  view::{Accessibility, AssignOp, BinaryOp, UnaryOp, UpdateOp, VarDeclKind},
  ParsedSource,
};
use indexmap::IndexMap;

// Keep in sync with JS
enum AstNode {
  Invalid,
  //
  Program,

  // Module declarations
  Import,
  ImportDecl,
  ExportDecl,
  ExportNamedDeclaration,
  ExportDefaultDecl,
  ExportDefaultExpr,
  ExportAll,
  TsImportEquals,
  TsExportAssignment,
  TsNamespaceExport,

  // Decls
  ClassDeclaration,
  Fn,
  Var,
  Using,
  TsInterface,
  TsTypeAlias,
  TsEnum,
  TsModule,

  // Statements
  Block,
  Empty,
  Debugger,
  With,
  Return,
  Labeled,
  Break,
  Continue,
  IfStatement,
  Switch,
  SwitchCase,
  Throw,
  TryStatement,
  While,
  DoWhileStatement,
  ForStatement,
  ForInStatement,
  ForOfStatement,
  Decl,
  Expr,

  // Expressions
  This,
  Array,
  Object,
  FunctionExpression,
  Unary,
  UpdateExpression,
  BinaryExpression,
  Assign,
  MemberExpression,
  Super,
  Cond,
  Call,
  New,
  Paren,
  Seq,
  Identifier,
  TemplateLiteral,
  TaggedTpl,
  ArrowFunctionExpression,
  ClassExpr,
  YieldExpression,
  MetaProp,
  AwaitExpression,
  LogicalExpression,
  TsTypeAssertion,
  TsConstAssertion,
  TsNonNull,
  TsAs,
  TsInstantiation,
  TsSatisfies,
  PrivateIdentifier,
  OptChain,

  // Literals
  StringLiteral,
  Bool,
  Null,
  NumericLiteral,
  BigIntLiteral,
  RegExpLiteral,

  // Custom
  EmptyExpr,
  Spread,
  Property,
  VariableDeclarator,
  CatchClause,
  RestElement,
  ExportSpecifier,
  TemplateElement,
  MethodDefinition,

  // Patterns
  ArrayPattern,
  AssignmentPattern,
  ObjectPattern,

  // JSX
  JSXAttribute,
  JSXClosingElement,
  JSXClosingFragment,
  JSXElement,
  JSXEmptyExpression,
  JSXExpressionContainer,
  JSXFragment,
  JSXIdentifier,
  JSXMemberExpression,
  JSXNamespacedName,
  JSXOpeningElement,
  JSXOpeningFragment,
  JSXSpreadAttribute,
  JSXSpreadChild,
  JSXText,
}

impl From<AstNode> for u8 {
  fn from(m: AstNode) -> u8 {
    m as u8
  }
}

const MASK_U32_1: u32 = 0b11111111_00000000_00000000_00000000;
const MASK_U32_2: u32 = 0b00000000_11111111_00000000_00000000;
const MASK_U32_3: u32 = 0b00000000_00000000_11111111_00000000;
const MASK_U32_4: u32 = 0b00000000_00000000_00000000_11111111;

fn append_u32(result: &mut Vec<u8>, value: u32) {
  let v1: u8 = ((value & MASK_U32_1) >> 24) as u8;
  let v2: u8 = ((value & MASK_U32_2) >> 16) as u8;
  let v3: u8 = ((value & MASK_U32_3) >> 8) as u8;
  let v4: u8 = (value & MASK_U32_4) as u8;

  result.push(v1);
  result.push(v2);
  result.push(v3);
  result.push(v4);
}

fn append_usize(result: &mut Vec<u8>, value: usize) {
  let raw = u32::try_from(value).unwrap();
  append_u32(result, raw);
}

fn write_usize(result: &mut [u8], value: usize, idx: usize) {
  let raw = u32::try_from(value).unwrap();

  let v1: u8 = ((raw & MASK_U32_1) >> 24) as u8;
  let v2: u8 = ((raw & MASK_U32_2) >> 16) as u8;
  let v3: u8 = ((raw & MASK_U32_3) >> 8) as u8;
  let v4: u8 = (raw & MASK_U32_4) as u8;

  result[idx] = v1;
  result[idx + 1] = v2;
  result[idx + 2] = v3;
  result[idx + 3] = v4;
}

enum Flag {
  ProgramModule,
  FnAsync,
  FnGenerator,
  FnDeclare,
  MemberComputed,
  PropShorthand,
  PropComputed,
  PropGetter,
  PropSetter,
  PropMethod,
  VarVar,
  VarConst,
  VarLet,
  VarDeclare,
  ExportType,
  TplTail,
  ForAwait,
  LogicalOr,
  LogicalAnd,
  LogicalNullishCoalescin,
  JSXSelfClosing,

  BinEqEq,
  BinNotEq,
  BinEqEqEq,
  BinNotEqEq,
  BinLt,
  BinLtEq,
  BinGt,
  BinGtEq,
  BinLShift,
  BinRShift,
  BinZeroFillRShift,
  BinAdd,
  BinSub,
  BinMul,
  BinDiv,
  BinMod,
  BinBitOr,
  BinBitXor,
  BinBitAnd,
  BinIn,
  BinInstanceOf,
  BinExp,

  UnaryMinus,
  UnaryPlus,
  UnaryBang,
  UnaryTilde,
  UnaryTypeOf,
  UnaryVoid,
  UnaryDelete,

  UpdatePrefix,
  UpdatePlusPlus,
  UpdateMinusMinus,

  YieldDelegate,
  ParamOptional,

  ClassDeclare,
  ClassAbstract,
  ClassConstructor,
  ClassMethod,
  ClassPublic,
  ClassProtected,
  ClassPrivate,
}

fn assign_op_to_flag(m: AssignOp) -> u8 {
  match m {
    AssignOp::Assign => 0,
    AssignOp::AddAssign => 1,
    AssignOp::SubAssign => 2,
    AssignOp::MulAssign => 3,
    AssignOp::DivAssign => 4,
    AssignOp::ModAssign => 5,
    AssignOp::LShiftAssign => 6,
    AssignOp::RShiftAssign => 7,
    AssignOp::ZeroFillRShiftAssign => 8,
    AssignOp::BitOrAssign => 9,
    AssignOp::BitXorAssign => 10,
    AssignOp::BitAndAssign => 11,
    AssignOp::ExpAssign => 12,
    AssignOp::AndAssign => 13,
    AssignOp::OrAssign => 14,
    AssignOp::NullishAssign => 15,
  }
}

impl From<Flag> for u8 {
  fn from(m: Flag) -> u8 {
    match m {
      Flag::ProgramModule => 0b00000001,
      Flag::FnAsync => 0b00000001,
      Flag::FnGenerator => 0b00000010,
      Flag::FnDeclare => 0b00000100,
      Flag::MemberComputed => 0b00000001,
      Flag::PropShorthand => 0b00000001,
      Flag::PropComputed => 0b00000010,
      Flag::PropGetter => 0b00000100,
      Flag::PropSetter => 0b00001000,
      Flag::PropMethod => 0b00010000,
      Flag::VarVar => 0b00000001,
      Flag::VarConst => 0b00000010,
      Flag::VarLet => 0b00000100,
      Flag::VarDeclare => 0b00001000,
      Flag::ExportType => 0b000000001,
      Flag::TplTail => 0b000000001,
      Flag::ForAwait => 0b000000001,
      Flag::LogicalOr => 0b000000001,
      Flag::LogicalAnd => 0b000000010,
      Flag::LogicalNullishCoalescin => 0b000000100,
      Flag::JSXSelfClosing => 0b000000001,
      Flag::BinEqEq => 1,
      Flag::BinNotEq => 2,
      Flag::BinEqEqEq => 3,
      Flag::BinNotEqEq => 4,
      Flag::BinLt => 5,
      Flag::BinLtEq => 6,
      Flag::BinGt => 7,
      Flag::BinGtEq => 8,
      Flag::BinLShift => 9,
      Flag::BinRShift => 10,
      Flag::BinZeroFillRShift => 11,
      Flag::BinAdd => 12,
      Flag::BinSub => 13,
      Flag::BinMul => 14,
      Flag::BinDiv => 15,
      Flag::BinMod => 16,
      Flag::BinBitOr => 17,
      Flag::BinBitXor => 18,
      Flag::BinBitAnd => 19,
      Flag::BinIn => 20,
      Flag::BinInstanceOf => 21,
      Flag::BinExp => 22,

      Flag::UnaryMinus => 1,
      Flag::UnaryPlus => 2,
      Flag::UnaryBang => 3,
      Flag::UnaryTilde => 4,
      Flag::UnaryTypeOf => 5,
      Flag::UnaryVoid => 6,
      Flag::UnaryDelete => 7,

      Flag::UpdatePrefix => 0b000000001,
      Flag::UpdatePlusPlus => 0b000000010,
      Flag::UpdateMinusMinus => 0b000000100,

      Flag::YieldDelegate => 1,
      Flag::ParamOptional => 1,

      Flag::ClassDeclare => 0b000000001,
      Flag::ClassAbstract => 0b000000010,
      Flag::ClassConstructor => 0b000000100,
      Flag::ClassMethod => 0b000001000,
      Flag::ClassPublic => 0b001000000,
      Flag::ClassProtected => 0b010000000,
      Flag::ClassPrivate => 0b10000000,
    }
  }
}

#[derive(Debug, Clone)]
struct FlagValue(u8);

impl FlagValue {
  fn new() -> Self {
    Self(0)
  }

  fn set(&mut self, flag: Flag) {
    let value: u8 = flag.into();
    self.0 |= value;
  }
}

#[derive(Debug)]
struct StringTable {
  id: usize,
  table: IndexMap<String, usize>,
}

impl StringTable {
  fn new() -> Self {
    Self {
      id: 0,
      table: IndexMap::new(),
    }
  }

  fn insert(&mut self, s: &str) -> usize {
    if let Some(id) = self.table.get(s) {
      return *id;
    }

    let id = self.id;
    self.id += 1;
    self.table.insert(s.to_string(), id);
    id
  }

  fn serialize(&mut self) -> Vec<u8> {
    let mut result: Vec<u8> = vec![];
    append_u32(&mut result, self.table.len() as u32);

    // Assume that it's sorted by id
    for (s, _id) in &self.table {
      let bytes = s.as_bytes();
      append_u32(&mut result, bytes.len() as u32);
      result.append(&mut bytes.to_vec());
    }

    // eprintln!("Serialized string table: {:#?}", result);

    result
  }
}

struct SerializeCtx {
  id: usize,
  id_to_offset: IndexMap<usize, usize>,
  result: Vec<u8>,
  str_table: StringTable,
}

impl SerializeCtx {
  fn new() -> Self {
    let mut ctx = Self {
      id: 0,
      id_to_offset: IndexMap::new(),
      result: vec![],
      str_table: StringTable::new(),
    };

    ctx.str_table.insert("");

    ctx.push_node(AstNode::Empty, 0, &DUMMY_SP);

    ctx
  }

  fn reserve_child_ids_with_count(&mut self, count: usize) -> usize {
    append_usize(&mut self.result, count);
    self.reserve_child_ids(count)
  }

  fn reserve_child_ids(&mut self, count: usize) -> usize {
    let offset = self.result.len();

    for _ in 0..count {
      append_usize(&mut self.result, 0);
    }

    offset
  }

  fn next_id(&mut self) -> usize {
    let id = self.id;
    self.id += 1;
    id
  }

  fn write_u8(&mut self, value: u8) {
    self.result.push(value);
  }

  fn write_node(
    &mut self,
    id: usize,
    kind: AstNode,
    parent_id: usize,
    span: &Span,
  ) {
    self.id_to_offset.insert(id, self.result.len());

    let kind_value: u8 = kind.into();
    self.result.push(kind_value);
    append_usize(&mut self.result, parent_id);

    // Span
    append_u32(&mut self.result, span.lo.0);
    append_u32(&mut self.result, span.hi.0);
  }

  fn write_ids<I>(&mut self, ids: I)
  where
    I: IntoIterator<Item = usize>,
  {
    let mut count = 0;
    let idx = self.result.len();
    append_usize(&mut self.result, 0);

    for id in ids {
      append_usize(&mut self.result, id);
      count += 1;
    }

    write_usize(&mut self.result, count, idx);
  }

  fn write_id(&mut self, id: usize) {
    append_usize(&mut self.result, id);
  }

  fn write_flags(&mut self, flags: &FlagValue) {
    self.result.push(flags.0)
  }

  fn push_node(
    &mut self,
    kind: AstNode,
    parent_id: usize,
    span: &Span,
  ) -> usize {
    let id = self.id;
    self.id_to_offset.insert(id, self.result.len());
    self.id += 1;

    let kind_value: u8 = kind.into();
    self.result.push(kind_value);
    append_usize(&mut self.result, parent_id);

    // Span
    append_u32(&mut self.result, span.lo.0);
    append_u32(&mut self.result, span.hi.0);

    id
  }
}

pub fn serialize_ast_bin(parsed_source: &ParsedSource) -> Vec<u8> {
  let mut ctx = SerializeCtx::new();

  let parent_id = 0;

  let program = &parsed_source.program();
  let mut flags = FlagValue::new();

  // eprintln!("SWC {:#?}", program);

  match program.as_ref() {
    Program::Module(module) => {
      let id = ctx.next_id();

      flags.set(Flag::ProgramModule);

      let child_ids = module
        .body
        .iter()
        .map(|item| match item {
          ModuleItem::ModuleDecl(module_decl) => {
            serialize_module_decl(&mut ctx, module_decl, parent_id)
          }
          ModuleItem::Stmt(stmt) => serialize_stmt(&mut ctx, stmt, id),
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Program, parent_id, &module.span);
      ctx.write_flags(&flags);
      ctx.write_ids(child_ids);
    }
    Program::Script(script) => {
      let id = ctx.next_id();

      let child_ids = script
        .body
        .iter()
        .map(|stmt| serialize_stmt(&mut ctx, stmt, id))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Program, parent_id, &script.span);
      ctx.write_flags(&flags);
      ctx.write_ids(child_ids);
    }
  }

  let mut result: Vec<u8> = vec![];

  // Serialize string table
  // eprintln!("STRING {:#?}", ctx.str_table);
  result.append(&mut ctx.str_table.serialize());

  // Serialize ids
  append_usize(&mut result, ctx.id_to_offset.len());

  let offset = result.len() + (ctx.id_to_offset.len() * 4);

  for (_i, value) in ctx.id_to_offset {
    append_usize(&mut result, value + offset);
  }

  // Append serialized AST
  result.append(&mut ctx.result);
  result
}

fn serialize_module_decl(
  ctx: &mut SerializeCtx,
  module_decl: &ModuleDecl,
  parent_id: usize,
) -> usize {
  match module_decl {
    ModuleDecl::Import(node) => {
      ctx.push_node(AstNode::Import, parent_id, &node.span)
    }
    ModuleDecl::ExportDecl(node) => {
      ctx.push_node(AstNode::ExportDecl, parent_id, &node.span)
    }
    ModuleDecl::ExportNamed(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      flags.set(Flag::ExportType);

      let src_id = node
        .src
        .as_ref()
        .map_or(0, |src| serialize_lit(ctx, &Lit::Str(*src.clone()), id));

      // FIXME: I don't think these are valid
      let attr_id = node.with.as_ref().map_or(0, |attributes| {
        serialize_expr(ctx, &Expr::Object(*attributes.clone()), id)
      });

      let spec_ids = node
        .specifiers
        .iter()
        .map(|spec| {
          match spec {
            ExportSpecifier::Named(child) => {
              let spec_id = ctx.next_id();

              let mut flags = FlagValue::new();
              flags.set(Flag::ExportType);

              let org_id =
                serialize_module_exported_name(ctx, &child.orig, spec_id);

              let exported_id = child.exported.as_ref().map_or(0, |exported| {
                serialize_module_exported_name(ctx, exported, spec_id)
              });

              ctx.write_node(
                spec_id,
                AstNode::ExportSpecifier,
                id,
                &child.span,
              );
              ctx.write_flags(&flags);
              ctx.write_id(org_id);
              ctx.write_id(exported_id);

              spec_id
            }

            // These two aren't syntactically valid
            ExportSpecifier::Namespace(_) => todo!(),
            ExportSpecifier::Default(_) => todo!(),
          }
        })
        .collect::<Vec<_>>();

      ctx.write_node(
        id,
        AstNode::ExportNamedDeclaration,
        parent_id,
        &node.span,
      );
      ctx.write_flags(&flags);
      ctx.write_id(src_id);
      ctx.write_id(attr_id);
      ctx.write_ids(spec_ids);

      id
    }
    ModuleDecl::ExportDefaultDecl(node) => {
      ctx.push_node(AstNode::ExportDefaultDecl, parent_id, &node.span)
    }
    ModuleDecl::ExportDefaultExpr(node) => {
      ctx.push_node(AstNode::ExportDefaultExpr, parent_id, &node.span)
    }
    ModuleDecl::ExportAll(node) => {
      ctx.push_node(AstNode::ExportAll, parent_id, &node.span)
    }
    ModuleDecl::TsImportEquals(node) => {
      ctx.push_node(AstNode::TsImportEquals, parent_id, &node.span)
    }
    ModuleDecl::TsExportAssignment(node) => {
      ctx.push_node(AstNode::TsExportAssignment, parent_id, &node.span)
    }
    ModuleDecl::TsNamespaceExport(node) => {
      ctx.push_node(AstNode::TsNamespaceExport, parent_id, &node.span)
    }
  }
}

fn serialize_stmt(
  ctx: &mut SerializeCtx,
  stmt: &Stmt,
  parent_id: usize,
) -> usize {
  match stmt {
    Stmt::Block(node) => {
      let id = ctx.next_id();

      let children = node
        .stmts
        .iter()
        .map(|stmt| serialize_stmt(ctx, stmt, parent_id))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Block, parent_id, &node.span);
      ctx.write_ids(children);

      id
    }
    Stmt::Empty(_) => 0,
    Stmt::Debugger(node) => {
      ctx.push_node(AstNode::Debugger, parent_id, &node.span)
    }
    Stmt::With(_) => todo!(),
    Stmt::Return(node) => {
      let id = ctx.next_id();

      let arg_id = node
        .arg
        .as_ref()
        .map_or(0, |arg| serialize_expr(ctx, arg, id));

      ctx.write_node(id, AstNode::Return, parent_id, &node.span);
      ctx.write_id(arg_id);

      id
    }
    Stmt::Labeled(node) => {
      let id = ctx.next_id();

      let ident_id = serialize_ident(ctx, &node.label, id);
      let stmt_id = serialize_stmt(ctx, &node.body, id);

      ctx.write_node(id, AstNode::Labeled, parent_id, &node.span);
      ctx.write_id(ident_id);
      ctx.write_id(stmt_id);

      id
    }
    Stmt::Break(node) => {
      let id = ctx.next_id();

      let arg_id = node
        .label
        .as_ref()
        .map_or(0, |label| serialize_ident(ctx, label, id));

      ctx.write_node(id, AstNode::Break, parent_id, &node.span);
      ctx.write_id(arg_id);

      id
    }
    Stmt::Continue(node) => {
      let id = ctx.next_id();

      let arg_id = node
        .label
        .as_ref()
        .map_or(0, |label| serialize_ident(ctx, label, id));

      ctx.write_node(id, AstNode::Continue, parent_id, &node.span);
      ctx.write_id(arg_id);

      id
    }
    Stmt::If(node) => {
      let id = ctx.next_id();

      let test_id = serialize_expr(ctx, node.test.as_ref(), id);
      let cons_id = serialize_stmt(ctx, node.cons.as_ref(), id);

      let alt_id = node
        .alt
        .as_ref()
        .map_or(0, |alt| serialize_stmt(ctx, alt, id));

      ctx.write_node(id, AstNode::IfStatement, parent_id, &node.span);
      ctx.write_id(test_id);
      ctx.write_id(cons_id);
      ctx.write_id(alt_id);

      id
    }
    Stmt::Switch(node) => {
      let id = ctx.next_id();

      let expr_id = serialize_expr(ctx, &node.discriminant, id);

      let case_ids = node
        .cases
        .iter()
        .map(|case| {
          let child_id = ctx.next_id();

          let test_id = case
            .test
            .as_ref()
            .map_or(0, |test| serialize_expr(ctx, test, child_id));

          let cons = case
            .cons
            .iter()
            .map(|cons| serialize_stmt(ctx, cons, child_id))
            .collect::<Vec<_>>();

          ctx.write_node(child_id, AstNode::SwitchCase, id, &case.span);
          ctx.write_id(test_id);
          ctx.write_ids(cons);

          child_id
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Switch, parent_id, &node.span);
      ctx.write_id(expr_id);
      ctx.write_ids(case_ids);

      id
    }
    Stmt::Throw(node) => {
      let id = ctx.next_id();

      let expr_id = serialize_expr(ctx, &node.arg, id);

      ctx.write_node(id, AstNode::Throw, parent_id, &node.span);
      ctx.write_id(expr_id);

      id
    }
    Stmt::Try(node) => {
      let id = ctx.next_id();

      let block_id = serialize_stmt(ctx, &Stmt::Block(node.block.clone()), id);

      let catch_id = node.handler.as_ref().map_or(0, |catch| {
        let clause_id = ctx.next_id();

        let param_id = catch
          .param
          .as_ref()
          .map_or(0, |param| serialize_pat(ctx, param, clause_id));

        let body_id = serialize_stmt(ctx, &Stmt::Block(catch.body.clone()), id);

        ctx.write_node(clause_id, AstNode::CatchClause, id, &catch.span);
        ctx.write_id(param_id);
        ctx.write_id(body_id);

        clause_id
      });

      let final_id = node.finalizer.as_ref().map_or(0, |finalizer| {
        serialize_stmt(ctx, &Stmt::Block(finalizer.clone()), id)
      });

      ctx.write_node(id, AstNode::TryStatement, parent_id, &node.span);
      ctx.write_id(block_id);
      ctx.write_id(catch_id);
      ctx.write_id(final_id);

      id
    }
    Stmt::While(node) => {
      let id = ctx.next_id();

      let test_id = serialize_expr(ctx, node.test.as_ref(), id);
      let stmt_id = serialize_stmt(ctx, node.body.as_ref(), id);

      ctx.write_node(id, AstNode::While, parent_id, &node.span);
      ctx.write_id(test_id);
      ctx.write_id(stmt_id);

      id
    }
    Stmt::DoWhile(node) => {
      let id = ctx.next_id();

      let expr_id = serialize_expr(ctx, node.test.as_ref(), id);
      let stmt_id = serialize_stmt(ctx, node.body.as_ref(), id);

      ctx.write_node(id, AstNode::DoWhileStatement, parent_id, &node.span);
      ctx.write_id(expr_id);
      ctx.write_id(stmt_id);

      id
    }
    Stmt::For(node) => {
      let id = ctx.next_id();

      let init_id = node.init.as_ref().map_or(0, |init| match init {
        VarDeclOrExpr::VarDecl(var_decl) => {
          serialize_stmt(ctx, &Stmt::Decl(Decl::Var(var_decl.clone())), id)
        }
        VarDeclOrExpr::Expr(expr) => serialize_expr(ctx, expr, id),
      });

      let test_id = node
        .test
        .as_ref()
        .map_or(0, |expr| serialize_expr(ctx, expr, id));
      let update_id = node
        .update
        .as_ref()
        .map_or(0, |expr| serialize_expr(ctx, expr, id));
      let body_id = serialize_stmt(ctx, node.body.as_ref(), id);

      ctx.write_node(id, AstNode::ForStatement, parent_id, &node.span);
      ctx.write_id(init_id);
      ctx.write_id(test_id);
      ctx.write_id(update_id);
      ctx.write_id(body_id);

      id
    }
    Stmt::ForIn(node) => {
      let id = ctx.next_id();

      let left_id = serialize_for_head(ctx, &node.left, id);
      let right_id = serialize_expr(ctx, node.right.as_ref(), id);
      let body_id = serialize_stmt(ctx, node.body.as_ref(), id);

      ctx.write_node(id, AstNode::ForInStatement, parent_id, &node.span);
      ctx.write_id(left_id);
      ctx.write_id(right_id);
      ctx.write_id(body_id);

      id
    }
    Stmt::ForOf(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      flags.set(Flag::ForAwait);

      let left_id = serialize_for_head(ctx, &node.left, id);
      let right_id = serialize_expr(ctx, node.right.as_ref(), id);
      let body_id = serialize_stmt(ctx, node.body.as_ref(), id);

      ctx.write_node(id, AstNode::ForOfStatement, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(left_id);
      ctx.write_id(right_id);
      ctx.write_id(body_id);

      id
    }
    Stmt::Decl(node) => serialize_decl(ctx, node, parent_id),
    Stmt::Expr(node) => {
      let id = ctx.next_id();

      let child_id = serialize_expr(ctx, node.expr.as_ref(), id);
      ctx.write_node(id, AstNode::Expr, parent_id, &node.span);
      ctx.write_id(child_id);

      id
    }
  }
}

fn serialize_expr(
  ctx: &mut SerializeCtx,
  expr: &Expr,
  parent_id: usize,
) -> usize {
  match expr {
    Expr::This(node) => ctx.push_node(AstNode::This, parent_id, &node.span),
    Expr::Array(node) => {
      let id = ctx.next_id();

      let elem_ids = node
        .elems
        .iter()
        .map(|item| {
          item
            .as_ref()
            .map_or(0, |item| serialize_expr_or_spread(ctx, item, id))
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Array, parent_id, &node.span);
      ctx.write_ids(elem_ids);

      id
    }
    Expr::Object(node) => {
      let id = ctx.next_id();

      let prop_ids = node
        .props
        .iter()
        .map(|prop| {
          match prop {
            PropOrSpread::Spread(spread_element) => serialize_spread(
              ctx,
              spread_element.expr.as_ref(),
              &spread_element.dot3_token,
              parent_id,
            ),
            PropOrSpread::Prop(prop) => {
              let mut flags = FlagValue::new();
              let prop_id = ctx.next_id();

              // FIXME: optional
              let (key_id, value_id) = match prop.as_ref() {
                Prop::Shorthand(ident) => {
                  flags.set(Flag::PropShorthand);

                  let child_id = serialize_ident(ctx, ident, prop_id);
                  (child_id, child_id)
                }
                Prop::KeyValue(key_value_prop) => {
                  if let PropName::Computed(_) = key_value_prop.key {
                    flags.set(Flag::PropComputed)
                  }

                  let key_id =
                    serialize_prop_name(ctx, &key_value_prop.key, prop_id);
                  let value_id =
                    serialize_expr(ctx, key_value_prop.value.as_ref(), prop_id);

                  (key_id, value_id)
                }
                Prop::Assign(assign_prop) => {
                  let child_id = ctx.next_id();

                  let key_id = serialize_ident(ctx, &assign_prop.key, prop_id);
                  let value_id =
                    serialize_expr(ctx, assign_prop.value.as_ref(), prop_id);

                  ctx.write_node(
                    child_id,
                    AstNode::AssignmentPattern,
                    prop_id,
                    &assign_prop.span,
                  );
                  ctx.write_id(key_id);
                  ctx.write_id(value_id);

                  (key_id, value_id)
                }
                Prop::Getter(getter_prop) => {
                  flags.set(Flag::PropGetter);

                  let key_id =
                    serialize_prop_name(ctx, &getter_prop.key, prop_id);

                  let value_id = serialize_expr(
                    ctx,
                    &Expr::Fn(FnExpr {
                      ident: None,
                      function: Box::new(Function {
                        params: vec![],
                        decorators: vec![],
                        span: getter_prop.span,
                        ctxt: SyntaxContext::empty(),
                        body: getter_prop.body.clone(),
                        is_generator: false,
                        is_async: false,
                        type_params: None, // FIXME
                        return_type: None,
                      }),
                    }),
                    prop_id,
                  );

                  (key_id, value_id)
                }
                Prop::Setter(setter_prop) => {
                  flags.set(Flag::PropSetter);

                  let key_id =
                    serialize_prop_name(ctx, &setter_prop.key, prop_id);

                  let param = Param::from(*setter_prop.param.clone());

                  let value_id = serialize_expr(
                    ctx,
                    &Expr::Fn(FnExpr {
                      ident: None,
                      function: Box::new(Function {
                        params: vec![param],
                        decorators: vec![],
                        span: setter_prop.span,
                        ctxt: SyntaxContext::empty(),
                        body: setter_prop.body.clone(),
                        is_generator: false,
                        is_async: false,
                        type_params: None,
                        return_type: None,
                      }),
                    }),
                    prop_id,
                  );

                  (key_id, value_id)
                }
                Prop::Method(method_prop) => {
                  flags.set(Flag::PropMethod);

                  let key_id =
                    serialize_prop_name(ctx, &method_prop.key, prop_id);

                  let value_id = serialize_expr(
                    ctx,
                    &Expr::Fn(FnExpr {
                      ident: None,
                      function: method_prop.function.clone(),
                    }),
                    prop_id,
                  );

                  (key_id, value_id)
                }
              };

              ctx.write_node(prop_id, AstNode::Property, id, &prop.span());
              ctx.write_flags(&flags);
              ctx.write_id(key_id);
              ctx.write_id(value_id);

              prop_id
            }
          }
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Object, parent_id, &node.span);
      ctx.write_ids(prop_ids);

      id
    }
    Expr::Fn(node) => {
      let id = ctx.next_id();
      let fn_obj = node.function.as_ref();

      let mut flags = FlagValue::new();
      if fn_obj.is_async {
        flags.set(Flag::FnAsync)
      }
      if fn_obj.is_generator {
        flags.set(Flag::FnGenerator)
      }

      let ident_id = node
        .ident
        .as_ref()
        .map_or(0, |ident| serialize_ident(ctx, ident, id));

      let type_param_id = fn_obj.type_params.as_ref().map_or(0, |param| {
        todo!() // FIXME
      });

      let param_ids = fn_obj
        .params
        .iter()
        .map(|param| serialize_pat(ctx, &param.pat, id))
        .collect::<Vec<_>>();

      let return_id = fn_obj.return_type.as_ref().map_or(0, |ret_type| {
        todo!() // FIXME
      });

      let block_id = fn_obj.body.as_ref().map_or(0, |block| {
        serialize_stmt(ctx, &Stmt::Block(block.clone()), id)
      });

      ctx.write_node(id, AstNode::FunctionExpression, parent_id, &fn_obj.span);
      ctx.write_flags(&flags);
      ctx.write_id(ident_id);
      ctx.write_id(type_param_id);
      ctx.write_ids(param_ids);
      ctx.write_id(return_id);
      ctx.write_id(block_id);

      id
    }
    Expr::Unary(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      flags.set(match node.op {
        UnaryOp::Minus => Flag::UnaryMinus,
        UnaryOp::Plus => Flag::UnaryPlus,
        UnaryOp::Bang => Flag::UnaryBang,
        UnaryOp::Tilde => Flag::UnaryTilde,
        UnaryOp::TypeOf => Flag::UnaryTypeOf,
        UnaryOp::Void => Flag::UnaryVoid,
        UnaryOp::Delete => Flag::UnaryDelete,
      });

      let child_id = serialize_expr(ctx, &node.arg, id);

      ctx.write_node(id, AstNode::Unary, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(child_id);

      id
    }
    Expr::Update(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.prefix {
        flags.set(Flag::UpdatePrefix);
      }
      flags.set(match node.op {
        UpdateOp::PlusPlus => Flag::UpdatePlusPlus,
        UpdateOp::MinusMinus => Flag::UpdateMinusMinus,
      });

      let child_id = serialize_expr(ctx, node.arg.as_ref(), id);

      ctx.write_node(id, AstNode::UpdateExpression, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(child_id);

      id
    }
    Expr::Bin(node) => {
      let (node_type, flag) = match node.op {
        BinaryOp::LogicalOr => (AstNode::LogicalExpression, Flag::LogicalOr),
        BinaryOp::LogicalAnd => (AstNode::LogicalExpression, Flag::LogicalAnd),
        BinaryOp::NullishCoalescing => {
          (AstNode::LogicalExpression, Flag::LogicalNullishCoalescin)
        }
        BinaryOp::EqEq => (AstNode::BinaryExpression, Flag::BinEqEq),
        BinaryOp::NotEq => (AstNode::BinaryExpression, Flag::BinNotEq),
        BinaryOp::EqEqEq => (AstNode::BinaryExpression, Flag::BinEqEqEq),
        BinaryOp::NotEqEq => (AstNode::BinaryExpression, Flag::BinNotEqEq),
        BinaryOp::Lt => (AstNode::BinaryExpression, Flag::BinLt),
        BinaryOp::LtEq => (AstNode::BinaryExpression, Flag::BinLtEq),
        BinaryOp::Gt => (AstNode::BinaryExpression, Flag::BinGt),
        BinaryOp::GtEq => (AstNode::BinaryExpression, Flag::BinGtEq),
        BinaryOp::LShift => (AstNode::BinaryExpression, Flag::BinLShift),
        BinaryOp::RShift => (AstNode::BinaryExpression, Flag::BinRShift),
        BinaryOp::ZeroFillRShift => {
          (AstNode::BinaryExpression, Flag::BinZeroFillRShift)
        }
        BinaryOp::Add => (AstNode::BinaryExpression, Flag::BinAdd),
        BinaryOp::Sub => (AstNode::BinaryExpression, Flag::BinSub),
        BinaryOp::Mul => (AstNode::BinaryExpression, Flag::BinMul),
        BinaryOp::Div => (AstNode::BinaryExpression, Flag::BinDiv),
        BinaryOp::Mod => (AstNode::BinaryExpression, Flag::BinMod),
        BinaryOp::BitOr => (AstNode::BinaryExpression, Flag::BinBitOr),
        BinaryOp::BitXor => (AstNode::BinaryExpression, Flag::BinBitXor),
        BinaryOp::BitAnd => (AstNode::BinaryExpression, Flag::BinBitAnd),
        BinaryOp::In => (AstNode::BinaryExpression, Flag::BinIn),
        BinaryOp::InstanceOf => {
          (AstNode::BinaryExpression, Flag::BinInstanceOf)
        }
        BinaryOp::Exp => (AstNode::BinaryExpression, Flag::BinExp),
      };

      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      flags.set(flag);

      let left_id = serialize_expr(ctx, node.left.as_ref(), id);
      let right_id = serialize_expr(ctx, node.right.as_ref(), id);

      ctx.write_node(id, node_type, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(left_id);
      ctx.write_id(right_id);

      id
    }
    Expr::Assign(node) => {
      let id = ctx.next_id();

      let left_id = match &node.left {
        AssignTarget::Simple(simple_assign_target) => {
          match simple_assign_target {
            SimpleAssignTarget::Ident(binding_ident) => {
              serialize_ident(ctx, &binding_ident.id, id)
            }
            SimpleAssignTarget::Member(member_expr) => {
              serialize_expr(ctx, &Expr::Member(member_expr.clone()), id)
            }
            SimpleAssignTarget::SuperProp(super_prop_expr) => todo!(),
            SimpleAssignTarget::Paren(paren_expr) => todo!(),
            SimpleAssignTarget::OptChain(opt_chain_expr) => todo!(),
            SimpleAssignTarget::TsAs(ts_as_expr) => todo!(),
            SimpleAssignTarget::TsSatisfies(ts_satisfies_expr) => todo!(),
            SimpleAssignTarget::TsNonNull(ts_non_null_expr) => todo!(),
            SimpleAssignTarget::TsTypeAssertion(ts_type_assertion) => todo!(),
            SimpleAssignTarget::TsInstantiation(ts_instantiation) => todo!(),
            SimpleAssignTarget::Invalid(invalid) => todo!(),
          }
        }
        AssignTarget::Pat(target) => match target {
          AssignTargetPat::Array(array_pat) => {
            serialize_pat(ctx, &Pat::Array(array_pat.clone()), id)
          }
          AssignTargetPat::Object(object_pat) => {
            serialize_pat(ctx, &Pat::Object(object_pat.clone()), id)
          }
          AssignTargetPat::Invalid(invalid) => todo!(),
        },
      };

      let right_id = serialize_expr(ctx, node.right.as_ref(), id);

      ctx.write_node(id, AstNode::Assign, parent_id, &node.span);
      ctx.write_u8(assign_op_to_flag(node.op));
      ctx.write_id(left_id);
      ctx.write_id(right_id);

      id
    }
    Expr::Member(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      let obj_id = serialize_expr(ctx, node.obj.as_ref(), id);

      let prop_id = match &node.prop {
        MemberProp::Ident(ident_name) => {
          serialize_ident_name(ctx, ident_name, id)
        }
        MemberProp::PrivateName(private_name) => {
          let child_id =
            ctx.push_node(AstNode::PrivateIdentifier, id, &private_name.span);

          let str_id = ctx.str_table.insert(private_name.name.as_str());
          append_usize(&mut ctx.result, str_id);

          child_id
        }
        MemberProp::Computed(computed_prop_name) => {
          flags.set(Flag::MemberComputed);
          serialize_expr(ctx, computed_prop_name.expr.as_ref(), id)
        }
      };

      ctx.write_node(id, AstNode::MemberExpression, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(obj_id);
      ctx.write_id(prop_id);

      id
    }
    Expr::SuperProp(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if let SuperProp::Computed(_) = node.prop {
        flags.set(Flag::MemberComputed)
      }

      let super_id = ctx.push_node(AstNode::Super, id, &node.obj.span);

      let child_id = match &node.prop {
        SuperProp::Ident(ident_name) => {
          serialize_ident_name(ctx, ident_name, id)
        }
        SuperProp::Computed(prop) => serialize_expr(ctx, &prop.expr, id),
      };

      ctx.write_node(id, AstNode::MemberExpression, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(super_id);
      ctx.write_id(child_id);

      id
    }
    Expr::Cond(node) => {
      let id = ctx.next_id();

      let test_id = serialize_expr(ctx, node.test.as_ref(), id);
      let cons_id = serialize_expr(ctx, node.cons.as_ref(), id);
      let alt_id = serialize_expr(ctx, node.alt.as_ref(), id);

      ctx.write_node(id, AstNode::Cond, parent_id, &node.span);
      ctx.write_id(test_id);
      ctx.write_id(cons_id);
      ctx.write_id(alt_id);

      id
    }
    Expr::Call(node) => {
      let id = ctx.next_id();

      let callee_id = match &node.callee {
        Callee::Super(super_node) => {
          ctx.push_node(AstNode::Super, id, &super_node.span)
        }
        Callee::Import(import) => todo!(),
        Callee::Expr(expr) => serialize_expr(ctx, expr, id),
      };

      let type_id = node.type_args.as_ref().map_or(0, |type_arg| {
        todo!() // FIXME
      });

      let arg_ids = node
        .args
        .iter()
        .map(|arg| serialize_expr_or_spread(ctx, arg, id))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Call, parent_id, &node.span);
      ctx.write_id(callee_id);
      ctx.write_id(type_id);
      ctx.write_ids(arg_ids);

      id
    }
    Expr::New(node) => {
      let id = ctx.next_id();

      let callee_id = serialize_expr(ctx, node.callee.as_ref(), id);

      let arg_ids: Vec<usize> = node.args.as_ref().map_or(vec![], |args| {
        args
          .iter()
          .map(|arg| serialize_expr_or_spread(ctx, arg, id))
          .collect::<Vec<_>>()
      });

      let type_arg_id = node.type_args.as_ref().map_or(0, |type_arg| {
        todo!() // FIXME
      });

      ctx.write_node(id, AstNode::New, parent_id, &node.span);
      ctx.write_id(callee_id);
      ctx.write_id(type_arg_id);
      ctx.write_ids(arg_ids);

      id
    }
    Expr::Seq(node) => {
      let id = ctx.next_id();

      let children = node
        .exprs
        .iter()
        .map(|expr| serialize_expr(ctx, expr, id))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Seq, parent_id, &node.span);
      ctx.write_ids(children);

      id
    }
    Expr::Ident(node) => serialize_ident(ctx, node, parent_id),
    Expr::Lit(node) => serialize_lit(ctx, node, parent_id),
    Expr::Tpl(node) => {
      let id = ctx.next_id();

      let quasi_ids = node
        .quasis
        .iter()
        .map(|quasi| {
          let tpl_id = ctx.next_id();

          let mut flags = FlagValue::new();
          flags.set(Flag::TplTail);

          let raw_str_id = ctx.str_table.insert(quasi.raw.as_str());

          let cooked_str_id = quasi
            .cooked
            .as_ref()
            .map_or(0, |cooked| ctx.str_table.insert(cooked.as_str()));

          ctx.write_node(tpl_id, AstNode::TemplateElement, id, &quasi.span);
          ctx.write_flags(&flags);
          append_usize(&mut ctx.result, raw_str_id);
          append_usize(&mut ctx.result, cooked_str_id);

          tpl_id
        })
        .collect::<Vec<_>>();

      let expr_ids = node
        .exprs
        .iter()
        .map(|expr| serialize_expr(ctx, expr, id))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::TemplateLiteral, parent_id, &node.span);
      ctx.write_ids(quasi_ids);
      ctx.write_ids(expr_ids);

      id
    }
    Expr::TaggedTpl(tagged_tpl) => {
      let id = ctx.push_node(AstNode::TaggedTpl, parent_id, &tagged_tpl.span);

      // FIXME

      id
    }
    Expr::Arrow(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.is_async {
        flags.set(Flag::FnAsync);
      }
      if node.is_generator {
        flags.set(Flag::FnGenerator);
      }

      let type_param_id = node.type_params.as_ref().map_or(0, |param| todo!());

      let param_ids = node
        .params
        .iter()
        .map(|param| serialize_pat(ctx, param, id))
        .collect::<Vec<_>>();

      let body_id = match node.body.as_ref() {
        BlockStmtOrExpr::BlockStmt(block_stmt) => {
          serialize_stmt(ctx, &Stmt::Block(block_stmt.clone()), id)
        }
        BlockStmtOrExpr::Expr(expr) => serialize_expr(ctx, expr.as_ref(), id),
      };

      let return_type_id = node.return_type.as_ref().map_or(0, |arg| {
        todo!() // FIXME
      });

      ctx.write_node(
        id,
        AstNode::ArrowFunctionExpression,
        parent_id,
        &node.span,
      );
      ctx.write_flags(&flags);
      ctx.write_id(type_param_id);
      ctx.write_ids(param_ids);
      ctx.write_id(body_id);
      ctx.write_id(return_type_id);

      id
    }
    Expr::Class(node) => {
      let id = ctx.push_node(AstNode::ClassExpr, parent_id, &node.class.span);

      // FIXME

      id
    }
    Expr::Yield(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.delegate {
        flags.set(Flag::YieldDelegate)
      }

      let arg_id = node
        .arg
        .as_ref()
        .map_or(0, |arg| serialize_expr(ctx, arg.as_ref(), id));

      ctx.write_node(id, AstNode::YieldExpression, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(arg_id);

      id
    }
    Expr::MetaProp(node) => {
      ctx.push_node(AstNode::MetaProp, parent_id, &node.span)
    }
    Expr::Await(node) => {
      let id = ctx.next_id();
      let arg_id = serialize_expr(ctx, node.arg.as_ref(), id);

      ctx.write_node(id, AstNode::AwaitExpression, parent_id, &node.span);
      ctx.write_id(arg_id);

      id
    }
    Expr::Paren(node) => {
      // Paren nodes are treated as a syntax only thing in TSEStree
      // and are never materialized to actual AST nodes.
      serialize_expr(ctx, &node.expr, parent_id)
    }
    Expr::JSXMember(node) => serialize_jsx_member_expr(ctx, node, parent_id),
    Expr::JSXNamespacedName(node) => {
      serialize_jsx_namespaced_name(ctx, node, parent_id)
    }
    Expr::JSXEmpty(node) => serialize_jsx_empty_expr(ctx, node, parent_id),
    Expr::JSXElement(node) => serialize_jsx_element(ctx, node, parent_id),
    Expr::JSXFragment(node) => serialize_jsx_fragment(ctx, node, parent_id),
    Expr::TsTypeAssertion(node) => {
      let id = ctx.push_node(AstNode::TsTypeAssertion, parent_id, &node.span);

      // FIXME

      id
    }
    Expr::TsConstAssertion(node) => {
      let id = ctx.next_id();
      let expr_id = serialize_expr(ctx, node.expr.as_ref(), id);

      ctx.write_node(id, AstNode::TsConstAssertion, parent_id, &node.span);
      ctx.write_id(expr_id);

      id
    }
    Expr::TsNonNull(node) => {
      let id = ctx.next_id();
      let expr_id = serialize_expr(ctx, node.expr.as_ref(), id);

      ctx.write_node(id, AstNode::TsNonNull, parent_id, &node.span);
      ctx.write_id(expr_id);

      id
    }
    Expr::TsAs(node) => {
      let id = ctx.next_id();

      let expr_id = serialize_expr(ctx, node.expr.as_ref(), id);
      let type_id = serialize_ts_type(ctx, node.type_ann.as_ref(), id);

      ctx.write_node(id, AstNode::TsAs, parent_id, &node.span);
      ctx.write_id(expr_id);
      ctx.write_id(type_id);

      id
    }
    Expr::TsInstantiation(node) => {
      let id = ctx.next_id();

      let expr_id = serialize_expr(ctx, node.expr.as_ref(), id);
      // FIXME
      // let expr_id = serialize_expr(ctx, ts_instantiation.type_args.as_ref(), id);
      ctx.write_node(id, AstNode::TsInstantiation, parent_id, &node.span);
      ctx.write_id(expr_id);

      id
    }
    Expr::TsSatisfies(node) => {
      let id = ctx.next_id();

      let expr_id = serialize_expr(ctx, node.expr.as_ref(), id);
      let type_id = serialize_ts_type(ctx, node.type_ann.as_ref(), id);

      ctx.write_node(id, AstNode::TsSatisfies, parent_id, &node.span);
      ctx.write_id(expr_id);
      ctx.write_id(type_id);

      id
    }
    Expr::PrivateName(node) => {
      let id = ctx.push_node(AstNode::PrivateIdentifier, parent_id, &node.span);

      // FIXME

      id
    }
    Expr::OptChain(node) => {
      let id = ctx.push_node(AstNode::OptChain, parent_id, &node.span);

      // FIXME

      id
    }
    Expr::Invalid(invalid) => {
      // ctx.push_node(result, AstNode::Invalid.into(), &invalid.span);
      todo!()
    }
  }
}

fn serialize_expr_or_spread(
  ctx: &mut SerializeCtx,
  arg: &ExprOrSpread,
  parent_id: usize,
) -> usize {
  if let Some(spread) = &arg.spread {
    serialize_spread(ctx, &arg.expr, spread, parent_id)
  } else {
    serialize_expr(ctx, arg.expr.as_ref(), parent_id)
  }
}

fn serialize_ident(
  ctx: &mut SerializeCtx,
  ident: &Ident,
  parent_id: usize,
) -> usize {
  let id = ctx.push_node(AstNode::Identifier, parent_id, &ident.span);

  let str_id = ctx.str_table.insert(ident.sym.as_str());
  append_usize(&mut ctx.result, str_id);

  id
}

fn serialize_module_exported_name(
  ctx: &mut SerializeCtx,
  name: &ModuleExportName,
  parent_id: usize,
) -> usize {
  match &name {
    ModuleExportName::Ident(ident) => serialize_ident(ctx, ident, parent_id),
    ModuleExportName::Str(lit) => {
      serialize_lit(ctx, &Lit::Str(lit.clone()), parent_id)
    }
  }
}

fn serialize_decl(
  ctx: &mut SerializeCtx,
  decl: &Decl,
  parent_id: usize,
) -> usize {
  match decl {
    Decl::Class(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.declare {
        flags.set(Flag::ClassDeclare)
      }
      if node.class.is_abstract {
        flags.set(Flag::ClassAbstract)
      }

      let ident_id = serialize_ident(ctx, &node.ident, id);
      let type_param_id =
        node.class.type_params.as_ref().map_or(0, |type_params| {
          // FIXME
          todo!()
        });

      let super_class_id = node
        .class
        .super_class
        .as_ref()
        .map_or(0, |super_class| serialize_expr(ctx, super_class, id));

      let super_type_params =
        node
          .class
          .super_type_params
          .as_ref()
          .map_or(0, |super_params| {
            // FIXME
            todo!()
          });

      let implement_ids = node
        .class
        .implements
        .iter()
        .map(|implements| {
          // FIXME
          todo!()
        })
        .collect::<Vec<_>>();

      let member_ids = node
        .class
        .body
        .iter()
        .map(|member| {
          match member {
            ClassMember::Constructor(constructor) => {
              let member_id = ctx.next_id();

              let mut flags = FlagValue::new();
              flags.set(Flag::ClassConstructor);
              accessibility_to_flag(&mut flags, constructor.accessibility);

              let key_id =
                serialize_prop_name(ctx, &constructor.key, member_id);
              let body_id = constructor.body.as_ref().map_or(0, |body| {
                serialize_stmt(ctx, &Stmt::Block(body.clone()), member_id)
              });

              let params = constructor
                .params
                .iter()
                .map(|param| match param {
                  ParamOrTsParamProp::TsParamProp(ts_param_prop) => todo!(),
                  ParamOrTsParamProp::Param(param) => {
                    serialize_pat(ctx, &param.pat, member_id)
                  }
                })
                .collect::<Vec<_>>();

              ctx.write_node(
                member_id,
                AstNode::MethodDefinition,
                id,
                &constructor.span,
              );
              ctx.write_flags(&flags);
              ctx.write_id(key_id);
              ctx.write_id(body_id);
              ctx.write_ids(params);

              member_id
            }
            ClassMember::Method(method) => {
              let member_id = ctx.next_id();

              let mut flags = FlagValue::new();
              flags.set(Flag::ClassMethod);
              if method.function.is_async {
                // FIXME
              }

              accessibility_to_flag(&mut flags, method.accessibility);

              let key_id = serialize_prop_name(ctx, &method.key, member_id);

              let body_id = method.function.body.as_ref().map_or(0, |body| {
                serialize_stmt(ctx, &Stmt::Block(body.clone()), member_id)
              });

              let params = method
                .function
                .params
                .iter()
                .map(|param| serialize_pat(ctx, &param.pat, member_id))
                .collect::<Vec<_>>();

              ctx.write_node(
                member_id,
                AstNode::MethodDefinition,
                id,
                &method.span,
              );
              ctx.write_flags(&flags);
              ctx.write_id(key_id);
              ctx.write_id(body_id);
              ctx.write_ids(params);

              member_id
            }
            ClassMember::PrivateMethod(private_method) => todo!(),
            ClassMember::ClassProp(class_prop) => todo!(),
            ClassMember::PrivateProp(private_prop) => todo!(),
            ClassMember::TsIndexSignature(ts_index_signature) => todo!(),
            ClassMember::Empty(_) => unreachable!(),
            ClassMember::StaticBlock(static_block) => todo!(),
            ClassMember::AutoAccessor(auto_accessor) => todo!(),
          }
        })
        .collect::<Vec<_>>();

      ctx.write_node(
        id,
        AstNode::ClassDeclaration,
        parent_id,
        &node.class.span,
      );
      ctx.write_flags(&flags);
      ctx.write_id(ident_id);
      ctx.write_id(type_param_id);
      ctx.write_id(super_class_id);
      ctx.write_id(super_type_params);
      ctx.write_ids(implement_ids);
      ctx.write_ids(member_ids);

      id
    }
    Decl::Fn(node) => {
      let id = ctx.next_id();
      let mut flags = FlagValue::new();
      if node.declare {
        flags.set(Flag::FnDeclare)
      }
      if node.function.is_async {
        flags.set(Flag::FnAsync)
      }
      if node.function.is_generator {
        flags.set(Flag::FnGenerator)
      }

      let ident_id = serialize_ident(ctx, &node.ident, parent_id);

      let type_param_id =
        node.function.type_params.as_ref().map_or(0, |type_param| {
          // FIXME
          todo!()
        });

      let return_type =
        node.function.return_type.as_ref().map_or(0, |return_type| {
          // FIXME
          todo!()
        });

      let body_id = node.function.body.as_ref().map_or(0, |body| {
        serialize_stmt(ctx, &Stmt::Block(body.clone()), id)
      });

      let params = node
        .function
        .params
        .iter()
        .map(|param| serialize_pat(ctx, &param.pat, id))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Fn, parent_id, &node.function.span);
      ctx.write_flags(&flags);
      ctx.write_id(ident_id);
      ctx.write_id(type_param_id);
      ctx.write_id(return_type);
      ctx.write_id(body_id);
      ctx.write_ids(params);

      id
    }
    Decl::Var(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.declare {
        flags.set(Flag::VarDeclare)
      }
      flags.set(match node.kind {
        VarDeclKind::Var => Flag::VarVar,
        VarDeclKind::Let => Flag::VarLet,
        VarDeclKind::Const => Flag::VarConst,
      });

      let children = node
        .decls
        .iter()
        .map(|decl| {
          let child_id = ctx.next_id();

          // FIXME: Definite?

          let decl_id = serialize_pat(ctx, &decl.name, child_id);

          let init_id = decl
            .init
            .as_ref()
            .map_or(0, |init| serialize_expr(ctx, init.as_ref(), child_id));

          ctx.write_node(child_id, AstNode::VariableDeclarator, id, &decl.span);
          ctx.write_id(decl_id);
          ctx.write_id(init_id);

          child_id
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::Var, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_ids(children);

      id
    }
    Decl::Using(node) => {
      let id = ctx.push_node(AstNode::Using, parent_id, &node.span);
      let offset = ctx.reserve_child_ids_with_count(node.decls.len());

      for (i, decl) in node.decls.iter().enumerate() {
        // FIXME
      }

      id
    }
    Decl::TsInterface(node) => {
      // ident + body + type_ann + extends(Vec)
      let count = 3 + node.extends.len();

      let id = ctx.push_node(AstNode::TsInterface, parent_id, &node.span);

      // FIXME

      id
    }
    Decl::TsTypeAlias(node) => {
      // FIXME: Declare flag
      let id = ctx.next_id();

      let ident_id = serialize_ident(ctx, &node.id, id);

      ctx.write_node(id, AstNode::TsTypeAlias, parent_id, &node.span);
      ctx.write_id(ident_id);

      // FIXME
      // let foo = ts_type_alias_decl.type_ann

      id
    }
    Decl::TsEnum(node) => {
      let id = ctx.next_id();

      let ident_id = serialize_ident(ctx, &node.id, parent_id);

      let members = node
        .members
        .iter()
        .map(|member| {
          // FIXME
          todo!()
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::TsEnum, parent_id, &node.span);
      ctx.write_id(ident_id);
      ctx.write_ids(members);

      id
    }
    Decl::TsModule(ts_module_decl) => {
      ctx.push_node(AstNode::TsModule, parent_id, &ts_module_decl.span)
    }
  }
}

fn accessibility_to_flag(
  flags: &mut FlagValue,
  accessibility: Option<Accessibility>,
) {
  if let Some(accessibility) = &accessibility {
    let value = match accessibility {
      Accessibility::Public => Flag::ClassPublic,
      Accessibility::Protected => Flag::ClassProtected,
      Accessibility::Private => Flag::ClassPrivate,
    };

    flags.set(value);
  }
}

fn serialize_jsx_element(
  ctx: &mut SerializeCtx,
  node: &JSXElement,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();

  let opening_id = serialize_jsx_opening_element(ctx, &node.opening, id);

  let closing_id = node.closing.as_ref().map_or(0, |closing| {
    let closing_id = ctx.next_id();

    let child_id = serialize_jsx_element_name(ctx, &closing.name, id);
    ctx.write_node(closing_id, AstNode::JSXClosingElement, id, &closing.span);
    ctx.write_id(child_id);

    closing_id
  });

  let children = serialize_jsx_children(ctx, &node.children, id);

  ctx.write_node(id, AstNode::JSXElement, parent_id, &node.span);
  ctx.write_id(opening_id);
  ctx.write_id(closing_id);
  ctx.write_ids(children);

  id
}

fn serialize_jsx_fragment(
  ctx: &mut SerializeCtx,
  node: &JSXFragment,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();

  let opening_id =
    ctx.push_node(AstNode::JSXOpeningFragment, id, &node.opening.span);
  let closing_id =
    ctx.push_node(AstNode::JSXClosingFragment, id, &node.closing.span);

  let children = serialize_jsx_children(ctx, &node.children, id);

  ctx.write_node(id, AstNode::JSXFragment, parent_id, &node.span);
  ctx.write_id(opening_id);
  ctx.write_id(closing_id);
  ctx.write_ids(children);

  id
}

fn serialize_jsx_children(
  ctx: &mut SerializeCtx,
  children: &[JSXElementChild],
  parent_id: usize,
) -> Vec<usize> {
  children
    .iter()
    .map(|child| {
      match child {
        JSXElementChild::JSXText(text) => {
          let id = ctx.push_node(AstNode::JSXText, parent_id, &text.span);

          let raw_id = ctx.str_table.insert(text.raw.as_str());
          let value_id = ctx.str_table.insert(text.value.as_str());

          append_usize(&mut ctx.result, raw_id);
          append_usize(&mut ctx.result, value_id);

          id
        }
        JSXElementChild::JSXExprContainer(container) => {
          serialize_jsx_container_expr(ctx, container, parent_id)
        }
        JSXElementChild::JSXElement(el) => {
          serialize_jsx_element(ctx, el, parent_id)
        }
        JSXElementChild::JSXFragment(frag) => {
          serialize_jsx_fragment(ctx, frag, parent_id)
        }
        // No parser supports this
        JSXElementChild::JSXSpreadChild(_) => unreachable!(),
      }
    })
    .collect::<Vec<_>>()
}

fn serialize_jsx_member_expr(
  ctx: &mut SerializeCtx,
  node: &JSXMemberExpr,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();

  let obj_id = match &node.obj {
    JSXObject::JSXMemberExpr(member) => {
      serialize_jsx_member_expr(ctx, member, id)
    }
    JSXObject::Ident(ident) => serialize_jsx_identifier(ctx, ident, parent_id),
  };

  let prop_id = serialize_ident_name_as_jsx_identifier(ctx, &node.prop, id);

  ctx.write_node(id, AstNode::JSXMemberExpression, parent_id, &node.span);
  ctx.write_id(obj_id);
  ctx.write_id(prop_id);

  id
}

fn serialize_jsx_element_name(
  ctx: &mut SerializeCtx,
  node: &JSXElementName,
  parent_id: usize,
) -> usize {
  match &node {
    JSXElementName::Ident(ident) => {
      serialize_jsx_identifier(ctx, ident, parent_id)
    }
    JSXElementName::JSXMemberExpr(member) => {
      serialize_jsx_member_expr(ctx, member, parent_id)
    }
    JSXElementName::JSXNamespacedName(ns) => {
      serialize_jsx_namespaced_name(ctx, ns, parent_id)
    }
  }
}

fn serialize_jsx_opening_element(
  ctx: &mut SerializeCtx,
  node: &JSXOpeningElement,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();

  let mut flags = FlagValue::new();
  if node.self_closing {
    flags.set(Flag::JSXSelfClosing);
  }

  let name_id = serialize_jsx_element_name(ctx, &node.name, id);

  // FIXME: type args

  let attr_ids = node
    .attrs
    .iter()
    .map(|attr| match attr {
      JSXAttrOrSpread::JSXAttr(jsxattr) => {
        let attr_id = ctx.next_id();

        let name_id = match &jsxattr.name {
          JSXAttrName::Ident(name) => {
            serialize_ident_name_as_jsx_identifier(ctx, name, attr_id)
          }
          JSXAttrName::JSXNamespacedName(node) => {
            serialize_jsx_namespaced_name(ctx, node, attr_id)
          }
        };

        let value_id = jsxattr.value.as_ref().map_or(0, |value| match value {
          JSXAttrValue::Lit(lit) => serialize_lit(ctx, lit, attr_id),
          JSXAttrValue::JSXExprContainer(container) => {
            serialize_jsx_container_expr(ctx, container, attr_id)
          }
          JSXAttrValue::JSXElement(el) => {
            serialize_jsx_element(ctx, el, attr_id)
          }
          JSXAttrValue::JSXFragment(frag) => {
            serialize_jsx_fragment(ctx, frag, attr_id)
          }
        });

        ctx.write_node(attr_id, AstNode::JSXAttribute, id, &jsxattr.span);
        ctx.write_id(name_id);
        ctx.write_id(value_id);

        attr_id
      }
      JSXAttrOrSpread::SpreadElement(spread) => {
        let attr_id = ctx.next_id();
        let child_id = serialize_expr(ctx, &spread.expr, attr_id);

        ctx.write_node(attr_id, AstNode::JSXAttribute, id, &spread.span());
        ctx.write_id(child_id);

        attr_id
      }
    })
    .collect::<Vec<_>>();

  ctx.write_node(id, AstNode::JSXOpeningElement, parent_id, &node.span);
  ctx.write_flags(&flags);
  ctx.write_id(name_id);
  ctx.write_ids(attr_ids);

  id
}

fn serialize_jsx_container_expr(
  ctx: &mut SerializeCtx,
  node: &JSXExprContainer,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();

  let child_id = match &node.expr {
    JSXExpr::JSXEmptyExpr(expr) => serialize_jsx_empty_expr(ctx, expr, id),
    JSXExpr::Expr(expr) => serialize_expr(ctx, expr, id),
  };

  ctx.write_node(id, AstNode::JSXExpressionContainer, parent_id, &node.span);
  ctx.write_id(child_id);

  id
}

fn serialize_jsx_empty_expr(
  ctx: &mut SerializeCtx,
  node: &JSXEmptyExpr,
  parent_id: usize,
) -> usize {
  ctx.push_node(AstNode::JSXEmptyExpression, parent_id, &node.span)
}

fn serialize_jsx_namespaced_name(
  ctx: &mut SerializeCtx,
  node: &JSXNamespacedName,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();

  let ns_id = serialize_ident_name_as_jsx_identifier(ctx, &node.ns, id);
  let name_id = serialize_ident_name_as_jsx_identifier(ctx, &node.name, id);

  ctx.write_node(id, AstNode::JSXNamespacedName, parent_id, &node.span);
  ctx.write_id(ns_id);
  ctx.write_id(name_id);

  id
}

fn serialize_ident_name_as_jsx_identifier(
  ctx: &mut SerializeCtx,
  node: &IdentName,
  parent_id: usize,
) -> usize {
  let id = ctx.push_node(AstNode::JSXIdentifier, parent_id, &node.span);

  let str_id = ctx.str_table.insert(node.sym.as_str());
  append_usize(&mut ctx.result, str_id);

  id
}

fn serialize_jsx_identifier(
  ctx: &mut SerializeCtx,
  node: &Ident,
  parent_id: usize,
) -> usize {
  let id = ctx.push_node(AstNode::JSXIdentifier, parent_id, &node.span);

  let str_id = ctx.str_table.insert(node.sym.as_str());
  append_usize(&mut ctx.result, str_id);

  id
}

fn serialize_pat(ctx: &mut SerializeCtx, pat: &Pat, parent_id: usize) -> usize {
  match pat {
    Pat::Ident(node) => serialize_ident(ctx, &node.id, parent_id),
    Pat::Array(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.optional {
        flags.set(Flag::ParamOptional);
      }

      let type_ann = node.type_ann.as_ref().map_or(0, |type_ann| {
        // FIXME
        todo!()
      });

      let children = node
        .elems
        .iter()
        .map(|pat| pat.as_ref().map_or(0, |v| serialize_pat(ctx, &v, id)))
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::ArrayPattern, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_id(type_ann);
      ctx.write_ids(children);

      id
    }
    Pat::Rest(node) => {
      let id = ctx.next_id();

      let type_id = node.type_ann.as_ref().map_or(0, |type_ann| {
        // FIXME
        todo!()
      });

      let arg_id = serialize_pat(ctx, &node.arg, parent_id);

      ctx.write_node(id, AstNode::RestElement, parent_id, &node.span);
      ctx.write_id(type_id);
      ctx.write_id(arg_id);

      id
    }
    Pat::Object(node) => {
      let id = ctx.next_id();

      let mut flags = FlagValue::new();
      if node.optional {
        flags.set(Flag::ParamOptional);
      }

      // FIXME: Type Ann
      if let Some(type_ann) = &node.type_ann {}

      let children = node
        .props
        .iter()
        .map(|prop| match prop {
          ObjectPatProp::KeyValue(key_value_prop) => {
            let child_id = ctx.next_id();
            let mut flags = FlagValue::new();
            if let PropName::Computed(_) = key_value_prop.key {
              flags.set(Flag::PropComputed)
            }

            let key_id =
              serialize_prop_name(ctx, &key_value_prop.key, child_id);
            let value_id =
              serialize_pat(ctx, key_value_prop.value.as_ref(), child_id);

            ctx.write_node(
              child_id,
              AstNode::Property,
              id,
              &key_value_prop.span(),
            );
            ctx.write_flags(&flags);
            ctx.write_id(key_id);
            ctx.write_id(value_id);

            child_id
          }
          ObjectPatProp::Assign(assign_pat_prop) => {
            let child_id = ctx.next_id();

            let ident_id =
              serialize_ident(ctx, &assign_pat_prop.key.id, parent_id);

            let value_id = assign_pat_prop
              .value
              .as_ref()
              .map_or(0, |value| serialize_expr(ctx, value, child_id));

            ctx.write_node(
              child_id,
              AstNode::Property,
              id,
              &assign_pat_prop.span,
            );
            ctx.write_flags(&FlagValue::new());
            ctx.write_id(ident_id);
            ctx.write_id(value_id);

            child_id
          }
          ObjectPatProp::Rest(rest_pat) => {
            serialize_pat(ctx, &Pat::Rest(rest_pat.clone()), parent_id)
          }
        })
        .collect::<Vec<_>>();

      ctx.write_node(id, AstNode::ObjectPattern, parent_id, &node.span);
      ctx.write_flags(&flags);
      ctx.write_ids(children);

      id
    }
    Pat::Assign(node) => {
      let id = ctx.next_id();

      let left_id = serialize_pat(ctx, &node.left, id);
      let right_id = serialize_expr(ctx, &node.right, id);

      ctx.write_node(id, AstNode::AssignmentPattern, parent_id, &node.span);
      ctx.write_id(left_id);
      ctx.write_id(right_id);

      id
    }
    Pat::Invalid(node) => todo!(),
    Pat::Expr(node) => serialize_expr(ctx, node, parent_id),
  }
}

fn serialize_for_head(
  ctx: &mut SerializeCtx,
  for_head: &ForHead,
  parent_id: usize,
) -> usize {
  match for_head {
    ForHead::VarDecl(var_decl) => {
      serialize_decl(ctx, &Decl::Var(var_decl.clone()), parent_id)
    }
    ForHead::UsingDecl(using_decl) => todo!(),
    ForHead::Pat(pat) => serialize_pat(ctx, pat, parent_id),
  }
}

fn serialize_spread(
  ctx: &mut SerializeCtx,
  expr: &Expr,
  span: &Span,
  parent_id: usize,
) -> usize {
  let id = ctx.next_id();
  let expr_id = serialize_expr(ctx, expr, id);

  ctx.write_node(id, AstNode::Spread, parent_id, span);
  ctx.write_id(expr_id);

  id
}

fn serialize_ident_name(
  ctx: &mut SerializeCtx,
  ident_name: &IdentName,
  parent_id: usize,
) -> usize {
  let id = ctx.push_node(AstNode::Identifier, parent_id, &ident_name.span);

  let str_id = ctx.str_table.insert(ident_name.sym.as_str());
  append_usize(&mut ctx.result, str_id);

  id
}

fn serialize_prop_name(
  ctx: &mut SerializeCtx,
  prop_name: &PropName,
  parent_id: usize,
) -> usize {
  match prop_name {
    PropName::Ident(ident_name) => {
      serialize_ident_name(ctx, ident_name, parent_id)
    }
    PropName::Str(str_prop) => {
      let child_id =
        ctx.push_node(AstNode::StringLiteral, parent_id, &str_prop.span);

      let str_id = ctx.str_table.insert(str_prop.value.as_str());
      append_usize(&mut ctx.result, str_id);

      child_id
    }
    PropName::Num(number) => {
      serialize_lit(ctx, &Lit::Num(number.clone()), parent_id)
    }
    PropName::Computed(node) => serialize_expr(ctx, &node.expr, parent_id),
    PropName::BigInt(big_int) => {
      serialize_lit(ctx, &Lit::BigInt(big_int.clone()), parent_id)
    }
  }
}

fn serialize_lit(ctx: &mut SerializeCtx, lit: &Lit, parent_id: usize) -> usize {
  match lit {
    Lit::Str(node) => {
      let id = ctx.push_node(AstNode::StringLiteral, parent_id, &node.span);
      let str_id = ctx.str_table.insert(node.value.as_str());
      append_usize(&mut ctx.result, str_id);

      id
    }
    Lit::Bool(lit_bool) => {
      let id = ctx.push_node(AstNode::Bool, parent_id, &lit_bool.span);

      let value: u8 = if lit_bool.value { 1 } else { 0 };
      ctx.result.push(value);

      id
    }
    Lit::Null(node) => ctx.push_node(AstNode::Null, parent_id, &node.span),
    Lit::Num(node) => {
      let id = ctx.push_node(AstNode::NumericLiteral, parent_id, &node.span);

      let value = node.raw.as_ref().unwrap();
      let str_id = ctx.str_table.insert(value.as_str());
      append_usize(&mut ctx.result, str_id);

      id
    }
    Lit::BigInt(node) => {
      let id = ctx.push_node(AstNode::BigIntLiteral, parent_id, &node.span);

      let str_id = ctx.str_table.insert(&node.value.to_string());
      append_usize(&mut ctx.result, str_id);

      id
    }
    Lit::Regex(node) => {
      let id = ctx.push_node(AstNode::RegExpLiteral, parent_id, &node.span);

      let pattern_id = ctx.str_table.insert(node.exp.as_str());
      let flag_id = ctx.str_table.insert(node.flags.as_str());

      append_usize(&mut ctx.result, pattern_id);
      append_usize(&mut ctx.result, flag_id);

      id
    }
    Lit::JSXText(jsxtext) => {
      ctx.push_node(AstNode::JSXText, parent_id, &jsxtext.span)
    }
  }
}

fn serialize_ts_type(
  ctx: &mut SerializeCtx,
  ts_type: &TsType,
  parent_id: usize,
) -> usize {
  todo!();
}