feat(es/typescript): Support deferred modifier

crates/swc_ecma_ast/src/typescript.rs

@@ -85,6 +85,7 @@ pub struct TsParamProp {
  pub accessibility: Option<Accessibility>,
  #[cfg_attr(feature = "serde-impl", serde(rename = "override"))]
  pub is_override: bool,
+ pub deferred: bool,
  pub readonly: bool,
  pub param: TsParamPropParam,
 }

crates/swc_ecma_codegen/src/typescript.rs

@@ -688,6 +688,11 @@ where
  fn emit_ts_param_prop(&mut self, n: &TsParamProp) -> Result {
  self.emit_leading_comments_of_span(n.span(), false)?;
 
+ if n.deferred {
+ keyword!("deferred");
+ space!();
+ }
+
  self.emit_accessibility(n.accessibility)?;
 
  for dec in &n.decorators {

crates/swc_ecma_parser/src/parser/pat.rs

@@ -335,6 +335,7 @@ impl<I: Tokens> Parser<I> {
  param_start: BytePos,
  decorators: Vec<Decorator>,
  ) -> PResult<ParamOrTsParamProp> {
+ let deferred = self.parse_ts_modifier(&["deferred"], false)?.is_some();
  let (accessibility, is_override, readonly) = if self.input.syntax().typescript() {
  let accessibility = self.parse_access_modifier()?;
  (
@@ -345,7 +346,7 @@ impl<I: Tokens> Parser<I> {
  } else {
  (None, false, false)
  };
- if accessibility.is_none() && !is_override && !readonly {
+ if accessibility.is_none() && !is_override && !readonly && !deferred {
  let pat = self.parse_formal_param_pat()?;
  Ok(ParamOrTsParamProp::Param(Param {
  span: span!(self, param_start),
@@ -362,6 +363,7 @@ impl<I: Tokens> Parser<I> {
  span: span!(self, param_start),
  accessibility,
  is_override,
+ deferred,
  readonly,
  decorators,
  param,

crates/swc_ecma_visit/src/lib.rs

@@ -1489,6 +1489,7 @@ define!({
  pub decorators: Vec<Decorator>,
  pub accessibility: Option<Accessibility>,
  pub is_override: bool,
+ pub deferred: bool,
  pub readonly: bool,
  pub param: TsParamPropParam,
  }