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use std::{path::PathBuf, sync::Arc};
use anyhow::{Context, Result};
use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use swc_core::{common::FileName, ecma::ast::Program};
use swc_relay::RelayLanguageConfig;
use turbo_tasks::{NonLocalValue, OperationValue, trace::TraceRawVcs};
use turbo_tasks_fs::FileSystemPath;
use turbopack_ecmascript::{CustomTransformer, TransformContext};
#[derive(
Clone, Debug, PartialEq, Serialize, Deserialize, TraceRawVcs, NonLocalValue, OperationValue,
)]
#[serde(rename_all = "camelCase")]
pub struct RelayConfig {
pub src: String,
pub artifact_directory: Option<String>,
pub language: Option<RelayLanguage>,
}
#[derive(
Clone, Debug, PartialEq, Serialize, Deserialize, TraceRawVcs, NonLocalValue, OperationValue,
)]
#[serde(rename_all = "lowercase")]
pub enum RelayLanguage {
TypeScript,
Flow,
JavaScript,
}
#[derive(Debug)]
pub struct RelayTransformer {
config: Arc<swc_relay::Config>,
project_path: FileSystemPath,
}
impl RelayTransformer {
pub fn new(config: &RelayConfig, project_path: &FileSystemPath) -> Self {
let options = swc_relay::Config {
artifact_directory: config.artifact_directory.as_ref().map(PathBuf::from),
language: config.language.as_ref().map_or(
RelayLanguageConfig::TypeScript,
|v| match v {
RelayLanguage::JavaScript => RelayLanguageConfig::JavaScript,
RelayLanguage::TypeScript => RelayLanguageConfig::TypeScript,
RelayLanguage::Flow => RelayLanguageConfig::Flow,
},
),
..Default::default()
};
Self {
config: options.into(),
project_path: project_path.clone(),
}
}
}
#[async_trait]
impl CustomTransformer for RelayTransformer {
#[tracing::instrument(level = tracing::Level::TRACE, name = "relay", skip_all)]
async fn transform(&self, program: &mut Program, ctx: &TransformContext<'_>) -> Result<()> {
// If user supplied artifact_directory, it should be resolvable already.
// Otherwise, supply default relative path (./__generated__)
let path_to_proj = PathBuf::from(
ctx.file_path
.parent()
.get_relative_path_to(&self.project_path)
.context("Expected relative path to relay artifact")?,
);
program.mutate(swc_relay::relay(
self.config.clone(),
FileName::Real(PathBuf::from(ctx.file_name_str)),
path_to_proj,
// [TODO]: pages_dir comes through next-swc-loader
// https://github.com/vercel/next.js/blob/ea472e8058faea8ebdab2ef6d3aab257a1f0d11c/packages/next/src/build/webpack-config.ts#L792
None,
Some(ctx.unresolved_mark),
));
Ok(())
}
}
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