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use anyhow::Result;
use turbo_rcstr::rcstr;
use turbo_tasks::{Vc, fxindexmap};
use turbo_tasks_env::{CommandLineProcessEnv, CustomProcessEnv, ProcessEnv};
use turbo_tasks_fs::FileSystemPath;
use crate::TryDotenvProcessEnv;
/// Loads a series of dotenv files according to the precedence rules set by
/// https://nextjs.org/docs/app/building-your-application/configuring/environment-variables#environment-variable-load-order
#[turbo_tasks::function]
pub async fn load_env(project_path: FileSystemPath) -> Result<Vc<Box<dyn ProcessEnv>>> {
let env: Vc<Box<dyn ProcessEnv>> = Vc::upcast(CommandLineProcessEnv::new());
let node_env = env.read(rcstr!("NODE_ENV")).await?;
let node_env = node_env.as_deref().unwrap_or("development");
let env = Vc::upcast(CustomProcessEnv::new(
env,
Vc::cell(fxindexmap! {
rcstr!("NODE_ENV") => node_env.into(),
}),
));
let mut files = [
Some(format!(".env.{node_env}.local")),
if node_env == "test" {
None
} else {
Some(".env.local".into())
},
Some(format!(".env.{node_env}")),
Some(".env".into()),
]
.into_iter()
.flatten();
let env = files.try_fold(env, |prior, f| {
let path = project_path.join(&f)?;
anyhow::Ok(Vc::upcast(TryDotenvProcessEnv::new(prior, path)))
})?;
Ok(env)
}
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