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//! JSON asset support for turbopack.
//!
//! JSON assets are parsed to ensure they contain valid JSON.
//!
//! When imported from ES modules, they produce a module that exports the
//! JSON value as an object.
#![feature(min_specialization)]
#![feature(arbitrary_self_types)]
#![feature(arbitrary_self_types_pointers)]
use std::fmt::Write;
use anyhow::{Error, Result, bail};
use turbo_rcstr::rcstr;
use turbo_tasks::{ResolvedVc, ValueToString, Vc};
use turbo_tasks_fs::{FileContent, FileJsonContent, glob::Glob};
use turbopack_core::{
asset::{Asset, AssetContent},
chunk::{ChunkItem, ChunkType, ChunkableModule, ChunkingContext},
ident::AssetIdent,
module::Module,
module_graph::ModuleGraph,
source::Source,
};
use turbopack_ecmascript::{
chunk::{
EcmascriptChunkItem, EcmascriptChunkItemContent, EcmascriptChunkPlaceable,
EcmascriptChunkType, EcmascriptExports,
},
runtime_functions::TURBOPACK_EXPORT_VALUE,
};
#[turbo_tasks::value]
pub struct JsonModuleAsset {
source: ResolvedVc<Box<dyn Source>>,
}
#[turbo_tasks::value_impl]
impl JsonModuleAsset {
#[turbo_tasks::function]
pub fn new(source: ResolvedVc<Box<dyn Source>>) -> Vc<Self> {
Self::cell(JsonModuleAsset { source })
}
}
#[turbo_tasks::value_impl]
impl Module for JsonModuleAsset {
#[turbo_tasks::function]
fn ident(&self) -> Vc<AssetIdent> {
self.source.ident().with_modifier(rcstr!("json"))
}
}
#[turbo_tasks::value_impl]
impl Asset for JsonModuleAsset {
#[turbo_tasks::function]
fn content(&self) -> Vc<AssetContent> {
self.source.content()
}
}
#[turbo_tasks::value_impl]
impl ChunkableModule for JsonModuleAsset {
#[turbo_tasks::function]
fn as_chunk_item(
self: ResolvedVc<Self>,
_module_graph: Vc<ModuleGraph>,
chunking_context: ResolvedVc<Box<dyn ChunkingContext>>,
) -> Vc<Box<dyn turbopack_core::chunk::ChunkItem>> {
Vc::upcast(JsonChunkItem::cell(JsonChunkItem {
module: self,
chunking_context,
}))
}
}
#[turbo_tasks::value_impl]
impl EcmascriptChunkPlaceable for JsonModuleAsset {
#[turbo_tasks::function]
fn get_exports(&self) -> Vc<EcmascriptExports> {
EcmascriptExports::Value.cell()
}
#[turbo_tasks::function]
fn is_marked_as_side_effect_free(&self, _side_effect_free_packages: Vc<Glob>) -> Vc<bool> {
Vc::cell(true)
}
}
#[turbo_tasks::value]
struct JsonChunkItem {
module: ResolvedVc<JsonModuleAsset>,
chunking_context: ResolvedVc<Box<dyn ChunkingContext>>,
}
#[turbo_tasks::value_impl]
impl ChunkItem for JsonChunkItem {
#[turbo_tasks::function]
fn asset_ident(&self) -> Vc<AssetIdent> {
self.module.ident()
}
#[turbo_tasks::function]
fn chunking_context(&self) -> Vc<Box<dyn ChunkingContext>> {
Vc::upcast(*self.chunking_context)
}
#[turbo_tasks::function]
async fn ty(&self) -> Result<Vc<Box<dyn ChunkType>>> {
Ok(Vc::upcast(
Vc::<EcmascriptChunkType>::default().resolve().await?,
))
}
#[turbo_tasks::function]
fn module(&self) -> Vc<Box<dyn Module>> {
Vc::upcast(*self.module)
}
}
#[turbo_tasks::value_impl]
impl EcmascriptChunkItem for JsonChunkItem {
#[turbo_tasks::function]
async fn content(&self) -> Result<Vc<EcmascriptChunkItemContent>> {
// We parse to JSON and then stringify again to ensure that the
// JSON is valid.
let content = self.module.content().file_content();
let data = content.parse_json().await?;
match &*data {
FileJsonContent::Content(data) => {
let js_str_content = serde_json::to_string(&data.to_string())?;
let inner_code = format!("{TURBOPACK_EXPORT_VALUE}(JSON.parse({js_str_content}));");
Ok(EcmascriptChunkItemContent {
inner_code: inner_code.into(),
..Default::default()
}
.into())
}
FileJsonContent::Unparsable(e) => {
let mut message = "Unable to make a module from invalid JSON: ".to_string();
if let FileContent::Content(content) = &*content.await? {
let text = content.content().to_str()?;
e.write_with_content(&mut message, text.as_ref())?;
} else {
write!(message, "{e}")?;
}
Err(Error::msg(message))
}
FileJsonContent::NotFound => {
bail!(
"JSON file not found: {}",
self.module.ident().to_string().await?
);
}
}
}
}
pub fn register() {
turbo_tasks::register();
turbo_tasks_fs::register();
turbopack_core::register();
turbopack_ecmascript::register();
include!(concat!(env!("OUT_DIR"), "/register.rs"));
}
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