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use anyhow::Result;
use serde::{Deserialize, Serialize};
use swc_core::{
common::DUMMY_SP,
ecma::ast::{ArrayLit, ArrayPat, Expr, Ident},
quote,
};
use turbo_rcstr::rcstr;
use turbo_tasks::{
FxIndexSet, NonLocalValue, ReadRef, ResolvedVc, TryFlatJoinIterExt, TryJoinIterExt, Vc,
trace::TraceRawVcs,
};
use turbopack_core::{
chunk::{AsyncModuleInfo, ChunkableModuleReference, ChunkingContext, ChunkingType},
reference::{ModuleReference, ModuleReferences},
resolve::ExternalType,
};
use super::esm::base::ReferencedAsset;
use crate::{
ScopeHoistingContext,
code_gen::{CodeGeneration, CodeGenerationHoistedStmt},
utils::AstSyntaxContext,
};
/// Information needed for generating the async module wrapper for
/// [EcmascriptChunkItem](crate::chunk::EcmascriptChunkItem)s.
#[derive(
PartialEq, Eq, Default, Debug, Clone, Serialize, Deserialize, TraceRawVcs, NonLocalValue,
)]
pub struct AsyncModuleOptions {
pub has_top_level_await: bool,
}
/// Option<[AsyncModuleOptions]>.
#[turbo_tasks::value(transparent)]
pub struct OptionAsyncModuleOptions(Option<AsyncModuleOptions>);
#[turbo_tasks::value_impl]
impl OptionAsyncModuleOptions {
#[turbo_tasks::function]
pub(crate) fn none() -> Vc<Self> {
Vc::cell(None)
}
}
/// Contains the information necessary to decide if an ecmascript module is
/// async.
///
/// It will check if the current module or any of it's children contain a top
/// level await statement or is referencing an external ESM module.
#[turbo_tasks::value(shared)]
pub struct AsyncModule {
pub has_top_level_await: bool,
pub import_externals: bool,
}
/// Option<[AsyncModule]>.
#[turbo_tasks::value(transparent)]
pub struct OptionAsyncModule(Option<ResolvedVc<AsyncModule>>);
#[turbo_tasks::value_impl]
impl OptionAsyncModule {
/// Create an empty [OptionAsyncModule].
#[turbo_tasks::function]
pub fn none() -> Vc<Self> {
Vc::cell(None)
}
#[turbo_tasks::function]
pub async fn module_options(
self: Vc<Self>,
async_module_info: Option<Vc<AsyncModuleInfo>>,
) -> Result<Vc<OptionAsyncModuleOptions>> {
if let Some(async_module) = &*self.await? {
return Ok(async_module.module_options(async_module_info));
}
Ok(OptionAsyncModuleOptions::none())
}
}
/// The identifiers (and their corresponding syntax context) of all async modules referenced by the
/// current module.
#[turbo_tasks::value(transparent)]
struct AsyncModuleIdents(FxIndexSet<(String, AstSyntaxContext)>);
async fn get_inherit_async_referenced_asset(
r: Vc<Box<dyn ModuleReference>>,
) -> Result<Option<ReadRef<ReferencedAsset>>> {
let Some(r) = Vc::try_resolve_downcast::<Box<dyn ChunkableModuleReference>>(r).await? else {
return Ok(None);
};
let Some(ty) = &*r.chunking_type().await? else {
return Ok(None);
};
if !matches!(
ty,
ChunkingType::Parallel {
inherit_async: true,
..
}
) {
return Ok(None);
};
let referenced_asset: turbo_tasks::ReadRef<ReferencedAsset> =
ReferencedAsset::from_resolve_result(r.resolve_reference()).await?;
Ok(Some(referenced_asset))
}
#[turbo_tasks::value_impl]
impl AsyncModule {
#[turbo_tasks::function]
async fn get_async_idents(
&self,
async_module_info: Vc<AsyncModuleInfo>,
references: Vc<ModuleReferences>,
chunking_context: Vc<Box<dyn ChunkingContext>>,
) -> Result<Vc<AsyncModuleIdents>> {
let async_module_info = async_module_info.await?;
let reference_idents = references
.await?
.iter()
.map(|r| async {
let Some(referenced_asset) = get_inherit_async_referenced_asset(**r).await? else {
return Ok(None);
};
Ok(match &*referenced_asset {
ReferencedAsset::External(_, ExternalType::EcmaScriptModule) => {
if self.import_externals {
referenced_asset
.get_ident(chunking_context, None, ScopeHoistingContext::None)
.await?
.map(|i| i.into_module_namespace_ident().unwrap())
.map(|(i, ctx)| (i, ctx.unwrap_or_default().into()))
} else {
None
}
}
ReferencedAsset::Some(placeable) => {
if async_module_info
.referenced_async_modules
.contains(&ResolvedVc::upcast(*placeable))
{
referenced_asset
.get_ident(chunking_context, None, ScopeHoistingContext::None)
.await?
.map(|i| i.into_module_namespace_ident().unwrap())
.map(|(i, ctx)| (i, ctx.unwrap_or_default().into()))
} else {
None
}
}
ReferencedAsset::External(..) => None,
ReferencedAsset::None | ReferencedAsset::Unresolvable => None,
})
})
.try_flat_join()
.await?;
Ok(Vc::cell(FxIndexSet::from_iter(reference_idents)))
}
#[turbo_tasks::function]
pub(crate) async fn is_self_async(&self, references: Vc<ModuleReferences>) -> Result<Vc<bool>> {
if self.has_top_level_await {
return Ok(Vc::cell(true));
}
Ok(Vc::cell(
self.import_externals
&& references
.await?
.iter()
.map(|r| async {
let Some(referenced_asset) =
get_inherit_async_referenced_asset(**r).await?
else {
return Ok(false);
};
Ok(matches!(
&*referenced_asset,
ReferencedAsset::External(_, ExternalType::EcmaScriptModule)
))
})
.try_join()
.await?
.iter()
.any(|&b| b),
))
}
/// Returns
#[turbo_tasks::function]
pub fn module_options(
&self,
async_module_info: Option<Vc<AsyncModuleInfo>>,
) -> Vc<OptionAsyncModuleOptions> {
if async_module_info.is_none() {
return Vc::cell(None);
}
Vc::cell(Some(AsyncModuleOptions {
has_top_level_await: self.has_top_level_await,
}))
}
}
impl AsyncModule {
pub async fn code_generation(
self: Vc<Self>,
async_module_info: Option<Vc<AsyncModuleInfo>>,
references: Vc<ModuleReferences>,
chunking_context: Vc<Box<dyn ChunkingContext>>,
) -> Result<CodeGeneration> {
if let Some(async_module_info) = async_module_info {
let async_idents = self
.get_async_idents(async_module_info, references, chunking_context)
.await?;
if !async_idents.is_empty() {
let idents = async_idents
.iter()
.map(|(ident, ctxt)| Ident::new(ident.clone().into(), DUMMY_SP, **ctxt))
.collect::<Vec<_>>();
return Ok(CodeGeneration::hoisted_stmts([
CodeGenerationHoistedStmt::new(rcstr!("__turbopack_async_dependencies__"),
quote!(
"var __turbopack_async_dependencies__ = __turbopack_handle_async_dependencies__($deps);"
as Stmt,
deps: Expr = Expr::Array(ArrayLit {
span: DUMMY_SP,
elems: idents
.iter()
.map(|ident| { Some(Expr::Ident(ident.clone()).into()) })
.collect(),
})
)
),
CodeGenerationHoistedStmt::new(rcstr!("__turbopack_async_dependencies__ await"),
quote!(
"($deps = __turbopack_async_dependencies__.then ? (await \
__turbopack_async_dependencies__)() : __turbopack_async_dependencies__);" as Stmt,
deps: AssignTarget = ArrayPat {
span: DUMMY_SP,
elems: idents
.into_iter()
.map(|ident| { Some(ident.into()) })
.collect(),
optional: false,
type_ann: None,
}.into(),
)),
].to_vec()));
}
}
Ok(CodeGeneration::empty())
}
}
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