rspack_resolver 0.7.0

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

#[cfg(not(target_os = "windows"))] // MemoryFS's path separator is always `/` so the test will not pass in windows.
mod windows {
  use std::path::PathBuf;

  use super::super::memory_fs::MemoryFS;
  use crate::{AliasValue, ResolveOptions, ResolverGeneric};

  fn file_system() -> MemoryFS {
    MemoryFS::new(&[
      ("/a/node_modules/package1/index.js", ""),
      ("/a/node_modules/package1/file.js", ""),
      ("/a/node_modules/package2/package.json", r#"{"main":"a"}"#),
      ("/a/node_modules/package2/a.js", ""),
      ("/a/node_modules/package3/package.json", r#"{"main":"dir"}"#),
      ("/a/node_modules/package3/dir/index.js", ""),
      (
        "/a/node_modules/package4/package.json",
        r#"{"browser":{"./a.js":"./b"}}"#,
      ),
      ("/a/node_modules/package4/a.js", ""),
      ("/a/node_modules/package4/b.js", ""),
      ("/a/abc.js", ""),
      ("/a/dir/index.js", ""),
      ("/a/index.js", ""),
    ])
  }

  #[tokio::test]
  async fn test() {
    let file_system = file_system();

    let resolver = ResolverGeneric::<MemoryFS>::new_with_file_system(
      file_system,
      ResolveOptions {
        alias: vec![
          ("alias1".into(), vec![AliasValue::from("/a/abc")]),
          ("alias2".into(), vec![AliasValue::from("/a")]),
        ],
        alias_fields: vec![vec!["browser".into()]],
        fully_specified: true,
        ..ResolveOptions::default()
      },
    );

    let failing_resolves = [
      ("no extensions", "./abc"),
      ("no extensions (absolute)", "/a/abc"),
      ("no extensions in packages", "package1/file"),
      ("no directories", "."),
      ("no directories 2", "./"),
      ("no directories in packages", "package3/dir"),
      ("no extensions in packages 2", "package3/a"),
    ];

    for (comment, request) in failing_resolves {
      let resolution = resolver.resolve("/a", request).await;
      assert!(resolution.is_err(), "{comment} {request}");
    }

    let successful_resolves = [
      ("fully relative", "./abc.js", "/a/abc.js"),
      ("fully absolute", "/a/abc.js", "/a/abc.js"),
      (
        "fully relative in package",
        "package1/file.js",
        "/a/node_modules/package1/file.js",
      ),
      (
        "extensions in mainFiles",
        "package1",
        "/a/node_modules/package1/index.js",
      ),
      (
        "extensions in mainFields",
        "package2",
        "/a/node_modules/package2/a.js",
      ),
      ("extensions in alias", "alias1", "/a/abc.js"),
      ("directories in alias", "alias2", "/a/index.js"),
      (
        "directories in packages",
        "package3",
        "/a/node_modules/package3/dir/index.js",
      ),
      (
        "extensions in aliasFields",
        "package4/a.js",
        "/a/node_modules/package4/b.js",
      ),
    ];

    for (comment, request, expected) in successful_resolves {
      let resolution = resolver.resolve("/a", request).await.map(|r| r.full_path());
      assert_eq!(
        resolution,
        Ok(PathBuf::from(expected)),
        "{comment} {request}"
      );
    }
  }

  #[tokio::test]
  #[cfg(not(target_os = "windows"))] // MemoryFS's path separator is always `/` so the test will not pass in windows.
  async fn resolve_to_context() {
    let file_system = file_system();

    let resolver = ResolverGeneric::<MemoryFS>::new_with_file_system(
      file_system,
      ResolveOptions {
        alias: vec![
          ("alias1".into(), vec![AliasValue::from("/a/abc")]),
          ("alias2".into(), vec![AliasValue::from("/a")]),
        ],
        alias_fields: vec![vec!["browser".into()]],
        fully_specified: true,
        resolve_to_context: true,
        ..ResolveOptions::default()
      },
    );

    let successful_resolves = [
      ("current folder", ".", "/a"),
      ("current folder 2", "./", "/a"),
      ("relative directory", "./dir", "/a/dir"),
      ("relative directory 2", "./dir/", "/a/dir"),
      (
        "relative directory with query and fragment",
        "./dir?123#456",
        "/a/dir?123#456",
      ),
      (
        "relative directory with query and fragment 2",
        "./dir/?123#456",
        "/a/dir?123#456",
      ),
      ("absolute directory", "/a/dir", "/a/dir"),
      (
        "directory in package",
        "package3/dir",
        "/a/node_modules/package3/dir",
      ),
    ];

    for (comment, request, expected) in successful_resolves {
      let resolution = resolver.resolve("/a", request).await.map(|r| r.full_path());
      assert_eq!(
        resolution,
        Ok(PathBuf::from(expected)),
        "{comment} {request}"
      );
    }
  }
}