feat: support resolving path with extra query (#54)

Author: JounQin

fixtures/enhanced_resolve/test/fixtures/export-query/add.js

@@ -0,0 +1 @@
+export const add = (a, b) => a + b

fixtures/enhanced_resolve/test/fixtures/export-query/equal.js

@@ -0,0 +1 @@
+export const equal = (a, b) => a === b

fixtures/enhanced_resolve/test/fixtures/export-query/minus.js

@@ -0,0 +1 @@
+export const minus = (a, b) => a - b

fixtures/enhanced_resolve/test/fixtures/export-query/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "export-query",
+  "exports": {
+    "./add": "./add.js?query1?query2",
+    "./minus": "./minus.js?query?extra",
+    "./equal": "./equal.js?query"
+  }
+}

src/lib.rs

@@ -936,6 +936,29 @@ impl<Fs: FileSystem> ResolverGeneric<Fs> {
         if let Some(path) = self.load_as_file_or_directory(cached_path, "", ctx)? {
             return Ok(Some(path));
         }
+
+        let mut path_str = cached_path.path().to_str();
+
+        // 3. If the RESOLVED_PATH contains `?``, it could be a path with query
+        //    so try to resolve it as a file or directory without the query,
+        //    but also `?` is a valid character in a path, so we should try from right to left.
+        while let Some(s) = path_str {
+            if let Some((before, _)) = s.rsplit_once('?') {
+                if (self.load_as_file_or_directory(
+                    &self.cache.value(Path::new(before)),
+                    "",
+                    ctx,
+                )?)
+                .is_some()
+                {
+                    return Ok(Some(cached_path.clone()));
+                }
+                path_str = Some(before);
+            } else {
+                break;
+            }
+        }
+
         // 3. THROW "not found"
         Err(ResolveError::NotFound(specifier.to_string()))
     }

src/tests/exports_field.rs

@@ -12,6 +12,7 @@ fn test_simple() {
     let f2 = super::fixture().join("exports-field2");
     let f4 = super::fixture().join("exports-field-error");
     let f5 = super::fixture().join("imports-exports-wildcard");
+    let f6 = super::fixture().join("export-query");
 
     let resolver = Resolver::new(ResolveOptions {
         extensions: vec![".js".into()],
@@ -43,6 +44,10 @@ fn test_simple() {
         ("should resolve with wildcard pattern #7", f5.clone(), "m/middle-3/nested/f", f5.join("node_modules/m/src/middle-3/nested/f/nested/f.js")),
         ("should resolve with wildcard pattern #8", f5.clone(), "m/middle-4/f/nested", f5.join("node_modules/m/src/middle-4/f/f.js")),
         ("should resolve with wildcard pattern #9", f5.clone(), "m/middle-5/f$/$", f5.join("node_modules/m/src/middle-5/f$/$.js")),
+        ("should resolve with query string #10", f6.clone(), "export-query/add", f6.join("add.js?query1?query2")),
+        // Sadly we can not use real `minus.js?query` and `equal.js?query` file due to Windows: invalid path
+        ("should resolve with query string #10", f6.clone(), "export-query/minus", f6.join("minus.js?query?extra")),
+        ("should resolve with query string #10", f6.clone(), "export-query/equal", f6.join("equal.js?query")),
     ];
 
     // Not needed or snapshot: