test: add specs for node loader

crates/swc_ecma_loader/Cargo.toml

@@ -27,18 +27,19 @@ tsc = ["dashmap", "once_cell", "swc_cached"]
 [dependencies]
 ahash = "0.7.4"
 anyhow = "1.0.41"
-dashmap = {version = "5.1.0", optional = true}
-lru = {version = "0.7.1", optional = true}
-once_cell = {version = "1.9.0", optional = true}
-parking_lot = {version = "0.12.0", optional = true}
-path-clean = {version = "=0.1.0", optional = true}
-serde = {version = "1", features = ["derive"]}
-serde_json = {version = "1.0.64", optional = true}
-swc_cached = {version = "0.1.0", optional = true, path = "../swc_cached"}
-swc_common = { version = "0.17.20", path = "../swc_common"}
+dashmap = { version = "5.1.0", optional = true }
+lru = { version = "0.7.1", optional = true }
+once_cell = { version = "1.9.0", optional = true }
+parking_lot = { version = "0.12.0", optional = true }
+path-clean = { version = "=0.1.0", optional = true }
+serde = { version = "1", features = ["derive"] }
+serde_json = { version = "1.0.64", optional = true }
+swc_cached = { version = "0.1.0", optional = true, path = "../swc_cached" }
+swc_common = { version = "0.17.20", path = "../swc_common" }
 tracing = "0.1.32"
 
 [dev-dependencies]
+lazy_static = "1.4.0"
 
 [target.'cfg(windows)'.dependencies]
-normpath = {version = "0.2", optional = true}
+normpath = { version = "0.2", optional = true }

crates/swc_ecma_loader/tests/.gitignore

@@ -0,0 +1 @@
+!node_modules

crates/swc_ecma_loader/tests/hoisting/packages/app/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "app",
+  "main": "file.js"
+}

crates/swc_ecma_loader/tests/node_resolver.rs

@@ -0,0 +1,68 @@
+#![cfg(feature = "node")]
+
+use std::{
+    collections::HashMap,
+    env::{current_dir, set_current_dir},
+    path::PathBuf,
+    sync::{Arc, Mutex},
+};
+
+use anyhow::{anyhow, Error};
+use lazy_static::lazy_static;
+use swc_common::{collections::AHashMap, FileName};
+extern crate swc_ecma_loader;
+use swc_ecma_loader::{resolve::Resolve, resolvers::node::NodeModulesResolver, TargetEnv};
+
+lazy_static! {
+    static ref UPDATE_DIR_MUTEX: Arc<Mutex<()>> = Arc::new(Mutex::new(()));
+}
+
+fn inside_directory(dir: &str, callback: fn()) {
+    let arc = Arc::clone(&UPDATE_DIR_MUTEX);
+    let _lock = arc.lock().expect("could not lock");
+
+    let initial_current_dir = current_dir().unwrap();
+    let new_current_dir = format!("{}{}", initial_current_dir.display(), dir);
+
+    set_current_dir(new_current_dir).unwrap();
+    callback();
+    set_current_dir(initial_current_dir).unwrap();
+}
+
+#[test]
+fn basic_import() {
+    inside_directory("/tests/basic_import", || {
+        // Given
+        let node_resolver = NodeModulesResolver::new(TargetEnv::Node, Default::default(), true);
+
+        // When
+        let resolved = node_resolver
+            .resolve(&FileName::Real(PathBuf::from(&"jquery")), &"jquery")
+            .expect("should resolve");
+
+        // Expect
+        assert_eq!(
+            resolved,
+            FileName::Real(PathBuf::from("node_modules/jquery/index.js"))
+        );
+    });
+}
+
+#[test]
+fn hoisting() {
+    inside_directory("/tests/hoisting/packages/app", || {
+        // Given
+        let node_resolver = NodeModulesResolver::new(TargetEnv::Node, Default::default(), true);
+
+        // When
+        let resolved = node_resolver
+            .resolve(&FileName::Real(PathBuf::from(&"jquery")), &"jquery")
+            .expect("should resolve");
+
+        // Expect
+        assert_eq!(
+            resolved,
+            FileName::Real(PathBuf::from("../../node_modules/jquery/index.js"))
+        );
+    });
+}