rspack_resolver 0.7.0

ESM / CJS module resolution
Documentation 
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//! <https://github.com/webpack/enhanced-resolve/blob/main/test/extension-alias.test.js>

use crate::{ResolveError, ResolveOptions, Resolver};

#[tokio::test]
async fn extension_alias() {
  let f = super::fixture().join("extension-alias");

  let resolver = Resolver::new(ResolveOptions {
    extensions: vec![".js".into()],
    main_files: vec!["index.js".into()],
    extension_alias: vec![
      (".js".into(), vec![".ts".into(), ".js".into()]),
      (".mjs".into(), vec![".mts".into()]),
    ],
    ..ResolveOptions::default()
  });

  #[rustfmt::skip]
    let pass = [
        ("should alias fully specified file", f.clone(), "./index.js", f.join("index.ts")),
        ("should alias fully specified file when there are two alternatives", f.clone(), "./dir/index.js", f.join("dir/index.ts")),
        ("should also allow the second alternative", f.clone(), "./dir2/index.js", f.join("dir2/index.js")),
        ("should support alias option without an array", f.clone(), "./dir2/index.mjs", f.join("dir2/index.mts")),
    ];

  for (comment, path, request, expected) in pass {
    let resolved_path = resolver
      .resolve(&path, request)
      .await
      .map(|r| r.full_path());
    assert_eq!(resolved_path, Ok(expected), "{comment} {path:?} {request}");
  }

  // should not allow to fallback to the original extension or add extensions
  let resolution = resolver.resolve(&f, "./index.mjs").await.unwrap_err();
  let expected = ResolveError::ExtensionAlias("index.mjs".into(), "index.mts".into(), f);
  assert_eq!(resolution, expected);
}

// should not apply extension alias to extensions or mainFiles field
#[tokio::test]
async fn not_apply_to_extension_nor_main_files() {
  let f = super::fixture().join("extension-alias");

  let resolver = Resolver::new(ResolveOptions {
    extensions: vec![".js".into()],
    main_files: vec!["index.js".into()],
    extension_alias: vec![(".js".into(), vec![])],
    ..ResolveOptions::default()
  });

  #[rustfmt::skip]
    let pass = [
        ("directory", f.clone(), "./dir2", "dir2/index.js"),
        ("file", f.clone(), "./dir2/index", "dir2/index.js"),
    ];

  for (comment, path, request, expected) in pass {
    let resolved_path = resolver
      .resolve(&path, request)
      .await
      .map(|r| r.full_path());
    let expected = f.join(expected);
    assert_eq!(resolved_path, Ok(expected), "{comment} {path:?} {request}");
  }
}