fix(npm): improve package.json exports support for types (#16880)

cli/lsp/documents.rs

@@ -14,7 +14,6 @@ use crate::file_fetcher::SUPPORTED_SCHEMES;
 use crate::node;
 use crate::node::node_resolve_npm_reference;
 use crate::node::NodeResolution;
-use crate::node::NodeResolutionMode;
 use crate::npm::NpmPackageReference;
 use crate::npm::NpmPackageReq;
 use crate::npm::NpmPackageResolver;
@@ -33,6 +32,7 @@ use deno_core::url;
 use deno_core::ModuleSpecifier;
 use deno_graph::GraphImport;
 use deno_graph::Resolved;
+use deno_runtime::deno_node::NodeResolutionMode;
 use once_cell::sync::Lazy;
 use std::collections::BTreeMap;
 use std::collections::HashMap;
@@ -957,7 +957,7 @@ impl Documents {
             node::node_resolve(
               &specifier,
               referrer,
-              node::NodeResolutionMode::Types,
+              NodeResolutionMode::Types,
               npm_resolver,
             )
             .ok()

cli/node/mod.rs

@@ -27,12 +27,12 @@ use deno_runtime::deno_node::package_imports_resolve;
 use deno_runtime::deno_node::package_resolve;
 use deno_runtime::deno_node::path_to_declaration_path;
 use deno_runtime::deno_node::NodeModuleKind;
+use deno_runtime::deno_node::NodeResolutionMode;
 use deno_runtime::deno_node::PackageJson;
 use deno_runtime::deno_node::PathClean;
 use deno_runtime::deno_node::RequireNpmResolver;
 use deno_runtime::deno_node::DEFAULT_CONDITIONS;
 use deno_runtime::deno_node::NODE_GLOBAL_THIS_NAME;
-use deno_runtime::deno_node::TYPES_CONDITIONS;
 use once_cell::sync::Lazy;
 use regex::Regex;
 
@@ -108,12 +108,6 @@ impl NodeResolution {
   }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum NodeResolutionMode {
-  Execution,
-  Types,
-}
-
 struct NodeModulePolyfill {
   /// Name of the module like "assert" or "timers/promises"
   name: &'static str,
@@ -480,8 +474,13 @@ pub fn node_resolve(
     }
   }
 
-  let conditions = mode_conditions(mode);
-  let url = module_resolve(specifier, referrer, conditions, npm_resolver)?;
+  let url = module_resolve(
+    specifier,
+    referrer,
+    DEFAULT_CONDITIONS,
+    mode,
+    npm_resolver,
+  )?;
   let url = match url {
     Some(url) => url,
     None => return Ok(None),
@@ -522,7 +521,8 @@ pub fn node_resolve_npm_reference(
       .unwrap_or_else(|| ".".to_string()),
     &package_folder,
     node_module_kind,
-    mode_conditions(mode),
+    DEFAULT_CONDITIONS,
+    mode,
     npm_resolver,
   )
   .with_context(|| {
@@ -548,13 +548,6 @@ pub fn node_resolve_npm_reference(
   Ok(Some(resolve_response))
 }
 
-fn mode_conditions(mode: NodeResolutionMode) -> &'static [&'static str] {
-  match mode {
-    NodeResolutionMode::Execution => DEFAULT_CONDITIONS,
-    NodeResolutionMode::Types => TYPES_CONDITIONS,
-  }
-}
-
 pub fn node_resolve_binary_export(
   pkg_req: &NpmPackageReq,
   bin_name: Option<&str>,
@@ -669,6 +662,7 @@ fn package_config_resolve(
   package_dir: &Path,
   referrer_kind: NodeModuleKind,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<Option<PathBuf>, AnyError> {
   let package_json_path = package_dir.join("package.json");
@@ -683,15 +677,15 @@ fn package_config_resolve(
       &referrer,
       referrer_kind,
       conditions,
+      mode,
       npm_resolver,
     );
     match result {
       Ok(found) => return Ok(Some(found)),
       Err(exports_err) => {
-        let is_types = conditions == TYPES_CONDITIONS;
-        if is_types && package_subpath == "." {
+        if mode.is_types() && package_subpath == "." {
           if let Ok(Some(path)) =
-            legacy_main_resolve(&package_config, referrer_kind, conditions)
+            legacy_main_resolve(&package_config, referrer_kind, mode)
           {
             return Ok(Some(path));
           } else {
@@ -703,7 +697,7 @@ fn package_config_resolve(
     }
   }
   if package_subpath == "." {
-    return legacy_main_resolve(&package_config, referrer_kind, conditions);
+    return legacy_main_resolve(&package_config, referrer_kind, mode);
   }
 
   Ok(Some(package_dir.join(package_subpath)))
@@ -789,12 +783,13 @@ fn module_resolve(
   specifier: &str,
   referrer: &ModuleSpecifier,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<Option<ModuleSpecifier>, AnyError> {
   // note: if we're here, the referrer is an esm module
   let url = if should_be_treated_as_relative_or_absolute_path(specifier) {
     let resolved_specifier = referrer.join(specifier)?;
-    if conditions == TYPES_CONDITIONS {
+    if mode.is_types() {
       let file_path = to_file_path(&resolved_specifier);
       // todo(dsherret): the node module kind is not correct and we
       // should use the value provided by typescript instead
@@ -813,6 +808,7 @@ fn module_resolve(
         referrer,
         NodeModuleKind::Esm,
         conditions,
+        mode,
         npm_resolver,
       )
       .map(|p| ModuleSpecifier::from_file_path(p).unwrap())?,
@@ -825,6 +821,7 @@ fn module_resolve(
       referrer,
       NodeModuleKind::Esm,
       conditions,
+      mode,
       npm_resolver,
     )?
     .map(|p| ModuleSpecifier::from_file_path(p).unwrap())
@@ -956,6 +953,7 @@ pub fn translate_cjs_to_esm(
       // FIXME(bartlomieju): check if these conditions are okay, probably
       // should be `deno-require`, because `deno` is already used in `esm_resolver.rs`
       &["deno", "require", "default"],
+      NodeResolutionMode::Execution,
       npm_resolver,
     )?;
     let reexport_specifier =
@@ -1026,6 +1024,7 @@ fn resolve(
   specifier: &str,
   referrer: &ModuleSpecifier,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<PathBuf, AnyError> {
   if specifier.starts_with('/') {
@@ -1050,7 +1049,7 @@ fn resolve(
   let module_dir = npm_resolver.resolve_package_folder_from_package(
     package_specifier.as_str(),
     &referrer_path,
-    conditions,
+    mode,
   )?;
 
   let package_json_path = module_dir.join("package.json");
@@ -1066,6 +1065,7 @@ fn resolve(
         referrer,
         NodeModuleKind::Esm,
         conditions,
+        mode,
         npm_resolver,
       );
     }

cli/npm/resolvers/common.rs

@@ -10,6 +10,7 @@ use deno_core::error::AnyError;
 use deno_core::futures;
 use deno_core::futures::future::BoxFuture;
 use deno_core::url::Url;
+use deno_runtime::deno_node::NodeResolutionMode;
 
 use crate::args::Lockfile;
 use crate::npm::cache::should_sync_download;
@@ -29,7 +30,7 @@ pub trait InnerNpmPackageResolver: Send + Sync {
     &self,
     name: &str,
     referrer: &ModuleSpecifier,
-    conditions: &[&str],
+    mode: NodeResolutionMode,
   ) -> Result<PathBuf, AnyError>;
 
   fn resolve_package_folder_from_specifier(

cli/npm/resolvers/global.rs

@@ -12,8 +12,8 @@ use deno_core::error::AnyError;
 use deno_core::futures::future::BoxFuture;
 use deno_core::futures::FutureExt;
 use deno_core::url::Url;
+use deno_runtime::deno_node::NodeResolutionMode;
 use deno_runtime::deno_node::PackageJson;
-use deno_runtime::deno_node::TYPES_CONDITIONS;
 
 use crate::args::Lockfile;
 use crate::npm::resolution::NpmResolution;
@@ -76,7 +76,7 @@ impl InnerNpmPackageResolver for GlobalNpmPackageResolver {
     &self,
     name: &str,
     referrer: &ModuleSpecifier,
-    conditions: &[&str],
+    mode: NodeResolutionMode,
   ) -> Result<PathBuf, AnyError> {
     let referrer_pkg_id = self
       .cache
@@ -84,7 +84,7 @@ impl InnerNpmPackageResolver for GlobalNpmPackageResolver {
     let pkg_result = self
       .resolution
       .resolve_package_from_package(name, &referrer_pkg_id);
-    if conditions == TYPES_CONDITIONS && !name.starts_with("@types/") {
+    if mode.is_types() && !name.starts_with("@types/") {
       // When doing types resolution, the package must contain a "types"
       // entry, or else it will then search for a @types package
       if let Ok(pkg) = pkg_result {

cli/npm/resolvers/local.rs

@@ -19,8 +19,8 @@ use deno_core::futures::future::BoxFuture;
 use deno_core::futures::FutureExt;
 use deno_core::url::Url;
 use deno_runtime::deno_core::futures;
+use deno_runtime::deno_node::NodeResolutionMode;
 use deno_runtime::deno_node::PackageJson;
-use deno_runtime::deno_node::TYPES_CONDITIONS;
 use tokio::task::JoinHandle;
 
 use crate::args::Lockfile;
@@ -152,7 +152,7 @@ impl InnerNpmPackageResolver for LocalNpmPackageResolver {
     &self,
     name: &str,
     referrer: &ModuleSpecifier,
-    conditions: &[&str],
+    mode: NodeResolutionMode,
   ) -> Result<PathBuf, AnyError> {
     let local_path = self.resolve_folder_for_specifier(referrer)?;
     let package_root_path = self.resolve_package_root(&local_path);
@@ -162,7 +162,7 @@ impl InnerNpmPackageResolver for LocalNpmPackageResolver {
       let sub_dir = join_package_name(current_folder, name);
       if sub_dir.is_dir() {
         // if doing types resolution, only resolve the package if it specifies a types property
-        if conditions == TYPES_CONDITIONS && !name.starts_with("@types/") {
+        if mode.is_types() && !name.starts_with("@types/") {
           let package_json = PackageJson::load_skip_read_permission(
             sub_dir.join("package.json"),
           )?;
@@ -175,7 +175,7 @@ impl InnerNpmPackageResolver for LocalNpmPackageResolver {
       }
 
       // if doing type resolution, check for the existance of a @types package
-      if conditions == TYPES_CONDITIONS && !name.starts_with("@types/") {
+      if mode.is_types() && !name.starts_with("@types/") {
         let sub_dir =
           join_package_name(current_folder, &types_package_name(name));
         if sub_dir.is_dir() {

cli/npm/resolvers/mod.rs

@@ -11,6 +11,7 @@ use deno_core::error::custom_error;
 use deno_core::error::AnyError;
 use deno_core::parking_lot::Mutex;
 use deno_core::serde_json;
+use deno_runtime::deno_node::NodeResolutionMode;
 use deno_runtime::deno_node::PathClean;
 use deno_runtime::deno_node::RequireNpmResolver;
 use global::GlobalNpmPackageResolver;
@@ -197,11 +198,11 @@ impl NpmPackageResolver {
     &self,
     name: &str,
     referrer: &ModuleSpecifier,
-    conditions: &[&str],
+    mode: NodeResolutionMode,
   ) -> Result<PathBuf, AnyError> {
     let path = self
       .inner
-      .resolve_package_folder_from_package(name, referrer, conditions)?;
+      .resolve_package_folder_from_package(name, referrer, mode)?;
     log::debug!("Resolved {} from {} to {}", name, referrer, path.display());
     Ok(path)
   }
@@ -330,10 +331,10 @@ impl RequireNpmResolver for NpmPackageResolver {
     &self,
     specifier: &str,
     referrer: &std::path::Path,
-    conditions: &[&str],
+    mode: NodeResolutionMode,
   ) -> Result<PathBuf, AnyError> {
     let referrer = path_to_specifier(referrer)?;
-    self.resolve_package_folder_from_package(specifier, &referrer, conditions)
+    self.resolve_package_folder_from_package(specifier, &referrer, mode)
   }
 
   fn resolve_package_folder_from_path(

cli/proc_state.rs

@@ -53,6 +53,7 @@ use deno_graph::source::Resolver;
 use deno_graph::ModuleKind;
 use deno_graph::Resolved;
 use deno_runtime::deno_broadcast_channel::InMemoryBroadcastChannel;
+use deno_runtime::deno_node::NodeResolutionMode;
 use deno_runtime::deno_tls::rustls::RootCertStore;
 use deno_runtime::deno_web::BlobStore;
 use deno_runtime::inspector_server::InspectorServer;
@@ -514,7 +515,7 @@ impl ProcState {
           .handle_node_resolve_result(node::node_resolve(
             specifier,
             &referrer,
-            node::NodeResolutionMode::Execution,
+            NodeResolutionMode::Execution,
             &self.npm_resolver,
           ))
           .with_context(|| {
@@ -547,7 +548,7 @@ impl ProcState {
             return self
               .handle_node_resolve_result(node::node_resolve_npm_reference(
                 &reference,
-                node::NodeResolutionMode::Execution,
+                NodeResolutionMode::Execution,
                 &self.npm_resolver,
               ))
               .with_context(|| format!("Could not resolve '{}'.", reference));

cli/tests/npm_tests.rs

@@ -327,6 +327,14 @@ mod npm {
     exit_code: 0,
   });
 
+  itest!(types_exports_import_types {
+    args: "run --check=all npm/types_exports_import_types/main.ts",
+    output: "npm/types_exports_import_types/main.out",
+    envs: env_vars_for_npm_tests(),
+    http_server: true,
+    exit_code: 0,
+  });
+
   itest!(types_no_types_entry {
     args: "run --check=all npm/types_no_types_entry/main.ts",
     output: "npm/types_no_types_entry/main.out",

cli/tests/testdata/npm/registry/@denotest/types-exports-import-types/1.0.0/dist/main.d.ts

@@ -0,0 +1 @@
+export function getValue(): 5;

cli/tests/testdata/npm/registry/@denotest/types-exports-import-types/1.0.0/dist/main.mjs

@@ -0,0 +1,3 @@
+export function getValue() {
+  return 5;
+}

cli/tests/testdata/npm/registry/@denotest/types-exports-import-types/1.0.0/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "@denotest/types-exports-import-types",
+  "version": "1.0.0",
+  "exports": {
+    "node": {
+      "types": "./dist/main.d.ts",
+      "import": "./dist/main.mjs"
+    }
+  }
+}

cli/tests/testdata/npm/types_exports_import_types/main.out

@@ -0,0 +1,4 @@
+Download http://localhost:4545/npm/registry/@denotest/types-exports-import-types
+Download http://localhost:4545/npm/registry/@denotest/types-exports-import-types/1.0.0.tgz
+Check file://[WILDCARD]/types_exports_import_types/main.ts
+5

cli/tests/testdata/npm/types_exports_import_types/main.ts

@@ -0,0 +1,4 @@
+import { getValue } from "npm:@denotest/types-exports-import-types";
+
+const result: 5 = getValue();
+console.log(result);

cli/tsc/mod.rs

@@ -6,7 +6,6 @@ use crate::graph_util::ModuleEntry;
 use crate::node;
 use crate::node::node_resolve_npm_reference;
 use crate::node::NodeResolution;
-use crate::node::NodeResolutionMode;
 use crate::npm::NpmPackageReference;
 use crate::npm::NpmPackageResolver;
 use crate::util::checksum;
@@ -33,6 +32,7 @@ use deno_core::OpState;
 use deno_core::RuntimeOptions;
 use deno_core::Snapshot;
 use deno_graph::Resolved;
+use deno_runtime::deno_node::NodeResolutionMode;
 use once_cell::sync::Lazy;
 use std::borrow::Cow;
 use std::collections::HashMap;
@@ -619,7 +619,7 @@ fn op_resolve(
                 node::node_resolve(
                   specifier,
                   &referrer,
-                  node::NodeResolutionMode::Types,
+                  NodeResolutionMode::Types,
                   npm_resolver,
                 )
                 .ok()

ext/node/lib.rs

@@ -30,8 +30,8 @@ pub use resolution::package_imports_resolve;
 pub use resolution::package_resolve;
 pub use resolution::path_to_declaration_path;
 pub use resolution::NodeModuleKind;
+pub use resolution::NodeResolutionMode;
 pub use resolution::DEFAULT_CONDITIONS;
-pub use resolution::TYPES_CONDITIONS;
 use std::cell::RefCell;
 
 pub trait NodePermissions {
@@ -43,7 +43,7 @@ pub trait RequireNpmResolver {
     &self,
     specifier: &str,
     referrer: &Path,
-    conditions: &[&str],
+    mode: NodeResolutionMode,
   ) -> Result<PathBuf, AnyError>;
 
   fn resolve_package_folder_from_path(
@@ -292,7 +292,7 @@ fn op_require_resolve_deno_dir(
     .resolve_package_folder_from_package(
       &request,
       &PathBuf::from(parent_filename),
-      DEFAULT_CONDITIONS,
+      NodeResolutionMode::Execution,
     )
     .ok()
     .map(|p| p.to_string_lossy().to_string())
@@ -506,6 +506,7 @@ fn op_require_try_self(
       &referrer,
       NodeModuleKind::Cjs,
       resolution::REQUIRE_CONDITIONS,
+      NodeResolutionMode::Execution,
       &*resolver,
     )
     .map(|r| Some(r.to_string_lossy().to_string()))
@@ -568,6 +569,7 @@ fn op_require_resolve_exports(
       &referrer,
       NodeModuleKind::Cjs,
       resolution::REQUIRE_CONDITIONS,
+      NodeResolutionMode::Execution,
       &*resolver,
     )
     .map(|r| Some(r.to_string_lossy().to_string()))
@@ -627,6 +629,7 @@ where
       &referrer,
       NodeModuleKind::Cjs,
       resolution::REQUIRE_CONDITIONS,
+      NodeResolutionMode::Execution,
       &*resolver,
     )
     .map(|r| Some(Url::from_file_path(r).unwrap().to_string()));

ext/node/resolution.rs

@@ -19,7 +19,6 @@ use crate::RequireNpmResolver;
 
 pub static DEFAULT_CONDITIONS: &[&str] = &["deno", "node", "import"];
 pub static REQUIRE_CONDITIONS: &[&str] = &["require", "node"];
-pub static TYPES_CONDITIONS: &[&str] = &["types"];
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum NodeModuleKind {
@@ -27,6 +26,18 @@ pub enum NodeModuleKind {
   Cjs,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum NodeResolutionMode {
+  Execution,
+  Types,
+}
+
+impl NodeResolutionMode {
+  pub fn is_types(&self) -> bool {
+    matches!(self, NodeResolutionMode::Types)
+  }
+}
+
 /// Checks if the resolved file has a corresponding declaration file.
 pub fn path_to_declaration_path(
   path: PathBuf,
@@ -175,6 +186,7 @@ pub fn package_imports_resolve(
   referrer: &ModuleSpecifier,
   referrer_kind: NodeModuleKind,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<PathBuf, AnyError> {
   if name == "#" || name.starts_with("#/") || name.ends_with('/') {
@@ -202,6 +214,7 @@ pub fn package_imports_resolve(
           false,
           true,
           conditions,
+          mode,
           npm_resolver,
         )?;
         if let Some(resolved) = maybe_resolved {
@@ -243,6 +256,7 @@ pub fn package_imports_resolve(
             true,
             true,
             conditions,
+            mode,
             npm_resolver,
           )?;
           if let Some(resolved) = maybe_resolved {
@@ -306,6 +320,7 @@ fn resolve_package_target_string(
   pattern: bool,
   internal: bool,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<PathBuf, AnyError> {
   if !subpath.is_empty() && !pattern && !target.ends_with('/') {
@@ -338,6 +353,7 @@ fn resolve_package_target_string(
           &package_json_url,
           referrer_kind,
           conditions,
+          mode,
           npm_resolver,
         ) {
           Ok(Some(path)) => Ok(path),
@@ -412,10 +428,11 @@ fn resolve_package_target(
   pattern: bool,
   internal: bool,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<Option<PathBuf>, AnyError> {
   if let Some(target) = target.as_str() {
-    return Ok(Some(resolve_package_target_string(
+    return resolve_package_target_string(
       target.to_string(),
       subpath,
       package_subpath,
@@ -425,8 +442,10 @@ fn resolve_package_target(
       pattern,
       internal,
       conditions,
+      mode,
       npm_resolver,
-    )?));
+    )
+    .map(Some);
   } else if let Some(target_arr) = target.as_array() {
     if target_arr.is_empty() {
       return Ok(None);
@@ -444,10 +463,17 @@ fn resolve_package_target(
         pattern,
         internal,
         conditions,
+        mode,
         npm_resolver,
       );
 
-      if let Err(e) = resolved_result {
+      match resolved_result {
+        Ok(Some(resolved)) => return Ok(Some(resolved)),
+        Ok(None) => {
+          last_error = None;
+          continue;
+        }
+        Err(e) => {
           let err_string = e.to_string();
           last_error = Some(e);
           if err_string.starts_with("[ERR_INVALID_PACKAGE_TARGET]") {
@@ -455,12 +481,7 @@ fn resolve_package_target(
           }
           return Err(last_error.unwrap());
         }
-      let resolved = resolved_result.unwrap();
-      if resolved.is_none() {
-        last_error = None;
-        continue;
       }
-      return Ok(resolved);
     }
     if last_error.is_none() {
       return Ok(None);
@@ -475,8 +496,20 @@ fn resolve_package_target(
       //   Some("\"exports\" cannot contain numeric property keys.".to_string()),
       // ));
 
-      if key == "default" || conditions.contains(&key.as_str()) {
+      if key == "default"
+        || conditions.contains(&key.as_str())
+        || mode.is_types() && key.as_str() == "types"
+      {
         let condition_target = target_obj.get(key).unwrap().to_owned();
+
+        if mode.is_types()
+          && key.as_str() != "types"
+          && condition_target.is_string()
+        {
+          // skip because this isn't a types entry
+          continue;
+        }
+
         let resolved = resolve_package_target(
           package_json_path,
           condition_target,
@@ -487,12 +520,15 @@ fn resolve_package_target(
           pattern,
           internal,
           conditions,
+          mode,
           npm_resolver,
         )?;
-        if resolved.is_none() {
+        match resolved {
+          Some(resolved) => return Ok(Some(resolved)),
+          None => {
             continue;
           }
-        return Ok(resolved);
+        }
       }
     }
   } else if target.is_null() {
@@ -520,6 +556,7 @@ fn throw_exports_not_found(
   )
 }
 
+#[allow(clippy::too_many_arguments)]
 pub fn package_exports_resolve(
   package_json_path: &Path,
   package_subpath: String,
@@ -527,6 +564,7 @@ pub fn package_exports_resolve(
   referrer: &ModuleSpecifier,
   referrer_kind: NodeModuleKind,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<PathBuf, AnyError> {
   if package_exports.contains_key(&package_subpath)
@@ -544,6 +582,7 @@ pub fn package_exports_resolve(
       false,
       false,
       conditions,
+      mode,
       npm_resolver,
     )?;
     if resolved.is_none() {
@@ -602,6 +641,7 @@ pub fn package_exports_resolve(
       true,
       false,
       conditions,
+      mode,
       npm_resolver,
     )?;
     if let Some(resolved) = maybe_resolved {
@@ -678,6 +718,7 @@ pub fn package_resolve(
   referrer: &ModuleSpecifier,
   referrer_kind: NodeModuleKind,
   conditions: &[&str],
+  mode: NodeResolutionMode,
   npm_resolver: &dyn RequireNpmResolver,
 ) -> Result<Option<PathBuf>, AnyError> {
   let (package_name, package_subpath, _is_scoped) =
@@ -696,6 +737,7 @@ pub fn package_resolve(
         referrer,
         referrer_kind,
         conditions,
+        mode,
         npm_resolver,
       )
       .map(Some);
@@ -705,7 +747,7 @@ pub fn package_resolve(
   let package_dir_path = npm_resolver.resolve_package_folder_from_package(
     &package_name,
     &referrer.to_file_path().unwrap(),
-    conditions,
+    mode,
   )?;
   let package_json_path = package_dir_path.join("package.json");
 
@@ -732,17 +774,18 @@ pub fn package_resolve(
       referrer,
       referrer_kind,
       conditions,
+      mode,
       npm_resolver,
     )
     .map(Some);
   }
   if package_subpath == "." {
-    return legacy_main_resolve(&package_json, referrer_kind, conditions);
+    return legacy_main_resolve(&package_json, referrer_kind, mode);
   }
 
   let file_path = package_json.path.parent().unwrap().join(&package_subpath);
 
-  if conditions == TYPES_CONDITIONS {
+  if mode.is_types() {
     let maybe_declaration_path =
       path_to_declaration_path(file_path, referrer_kind);
     Ok(maybe_declaration_path)
@@ -803,10 +846,9 @@ fn file_exists(path: &Path) -> bool {
 pub fn legacy_main_resolve(
   package_json: &PackageJson,
   referrer_kind: NodeModuleKind,
-  conditions: &[&str],
+  mode: NodeResolutionMode,
 ) -> Result<Option<PathBuf>, AnyError> {
-  let is_types = conditions == TYPES_CONDITIONS;
-  let maybe_main = if is_types {
+  let maybe_main = if mode.is_types() {
     match package_json.types.as_ref() {
       Some(types) => Some(types),
       None => {
@@ -832,7 +874,7 @@ pub fn legacy_main_resolve(
     }
 
     // todo(dsherret): investigate exactly how node and typescript handles this
-    let endings = if is_types {
+    let endings = if mode.is_types() {
       match referrer_kind {
         NodeModuleKind::Cjs => {
           vec![".d.ts", ".d.cts", "/index.d.ts", "/index.d.cts"]
@@ -863,7 +905,7 @@ pub fn legacy_main_resolve(
     }
   }
 
-  let index_file_names = if is_types {
+  let index_file_names = if mode.is_types() {
     // todo(dsherret): investigate exactly how typescript does this
     match referrer_kind {
       NodeModuleKind::Cjs => vec!["index.d.ts", "index.d.cts"],