build_helper/
npm.rs

1use std::error::Error;
2use std::path::{Path, PathBuf};
3use std::process::Command;
4use std::{fs, io};
5
6/// Install all the npm deps, and return the path of `node_modules`.
7pub fn install(src_root_path: &Path, out_dir: &Path, yarn: &Path) -> Result<PathBuf, io::Error> {
8    let nm_path = out_dir.join("node_modules");
9    let copy_to_build = |p| {
10        fs::copy(src_root_path.join(p), out_dir.join(p)).map_err(|e| {
11            eprintln!("unable to copy {p:?} to build directory: {e:?}");
12            e
13        })
14    };
15    // copy stuff to the output directory to make node_modules get put there.
16    copy_to_build("package.json")?;
17    copy_to_build("yarn.lock")?;
18
19    let mut cmd = Command::new(yarn);
20    cmd.arg("install");
21    // make sure our `yarn.lock` file actually means something
22    cmd.arg("--frozen");
23
24    cmd.current_dir(out_dir);
25    let exit_status = cmd.spawn()?.wait()?;
26    if !exit_status.success() {
27        eprintln!("yarn install did not exit successfully");
28        return Err(io::Error::other(Box::<dyn Error + Send + Sync>::from(format!(
29            "yarn install returned exit code {exit_status}"
30        ))));
31    }
32    Ok(nm_path)
33}
build_helper/npm.rs

build_helper/
npm.rs
