refactor(node_resolver): make conditions_from_resolution_mode configurable (#27596)

cli/factory.rs

@@ -670,6 +670,7 @@ impl CliFactory {
               .into_npm_pkg_folder_resolver(),
             self.pkg_json_resolver().clone(),
             self.sys(),
+            node_resolver::ConditionsFromResolutionMode::default(),
           )))
         }
         .boxed_local(),

cli/lsp/resolver.rs

@@ -783,6 +783,7 @@ impl<'a> ResolverFactory<'a> {
           npm_resolver.clone().into_npm_pkg_folder_resolver(),
           self.pkg_json_resolver.clone(),
           self.sys.clone(),
+          node_resolver::ConditionsFromResolutionMode::default(),
         )))
       })
       .as_ref()

cli/standalone/mod.rs

@@ -833,6 +833,7 @@ pub async fn run(
     npm_resolver.clone().into_npm_pkg_folder_resolver(),
     pkg_json_resolver.clone(),
     sys.clone(),
+    node_resolver::ConditionsFromResolutionMode::default(),
   ));
   let cjs_tracker = Arc::new(CjsTracker::new(
     in_npm_pkg_checker.clone(),

resolvers/node/lib.rs

@@ -9,6 +9,7 @@ mod npm;
 mod package_json;
 mod path;
 mod resolution;
+
 mod sync;
 
 pub use deno_package_json::PackageJson;
@@ -22,6 +23,7 @@ pub use package_json::PackageJsonThreadLocalCache;
 pub use path::PathClean;
 pub use resolution::parse_npm_pkg_name;
 pub use resolution::resolve_specifier_into_node_modules;
+pub use resolution::ConditionsFromResolutionMode;
 pub use resolution::IsBuiltInNodeModuleChecker;
 pub use resolution::NodeResolution;
 pub use resolution::NodeResolutionKind;

resolvers/node/resolution.rs

@@ -1,6 +1,7 @@
 // Copyright 2018-2025 the Deno authors. MIT license.
 
 use std::borrow::Cow;
+use std::fmt::Debug;
 use std::path::Path;
 use std::path::PathBuf;
 
@@ -54,12 +55,32 @@ pub static DEFAULT_CONDITIONS: &[&str] = &["deno", "node", "import"];
 pub static REQUIRE_CONDITIONS: &[&str] = &["require", "node"];
 static TYPES_ONLY_CONDITIONS: &[&str] = &["types"];
 
-fn conditions_from_resolution_mode(
+type ConditionsFromResolutionModeFn = Box<
+  dyn Fn(ResolutionMode) -> &'static [&'static str] + Send + Sync + 'static,
+>;
+
+#[derive(Default)]
+pub struct ConditionsFromResolutionMode(Option<ConditionsFromResolutionModeFn>);
+
+impl Debug for ConditionsFromResolutionMode {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    f.debug_struct("ConditionsFromResolutionMode").finish()
+  }
+}
+
+impl ConditionsFromResolutionMode {
+  pub fn new(func: ConditionsFromResolutionModeFn) -> Self {
+    Self(Some(func))
+  }
+
+  fn resolve(
+    &self,
     resolution_mode: ResolutionMode,
-) -> &'static [&'static str] {
-  match resolution_mode {
-    ResolutionMode::Import => DEFAULT_CONDITIONS,
-    ResolutionMode::Require => REQUIRE_CONDITIONS,
+  ) -> &'static [&'static str] {
+    match &self.0 {
+      Some(func) => func(ResolutionMode::Import),
+      None => resolution_mode.default_conditions(),
+    }
   }
 }
 
@@ -69,6 +90,15 @@ pub enum ResolutionMode {
   Require,
 }
 
+impl ResolutionMode {
+  pub fn default_conditions(&self) -> &'static [&'static str] {
+    match self {
+      ResolutionMode::Import => DEFAULT_CONDITIONS,
+      ResolutionMode::Require => REQUIRE_CONDITIONS,
+    }
+  }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum NodeResolutionKind {
   Execution,
@@ -120,6 +150,7 @@ pub struct NodeResolver<
   npm_pkg_folder_resolver: NpmPackageFolderResolverRc,
   pkg_json_resolver: PackageJsonResolverRc<TSys>,
   sys: TSys,
+  conditions_from_resolution_mode: ConditionsFromResolutionMode,
 }
 
 impl<
@@ -133,6 +164,7 @@ impl<
     npm_pkg_folder_resolver: NpmPackageFolderResolverRc,
     pkg_json_resolver: PackageJsonResolverRc<TSys>,
     sys: TSys,
+    conditions_from_resolution_mode: ConditionsFromResolutionMode,
   ) -> Self {
     Self {
       in_npm_pkg_checker,
@@ -140,6 +172,7 @@ impl<
       npm_pkg_folder_resolver,
       pkg_json_resolver,
       sys,
+      conditions_from_resolution_mode,
     }
   }
 
@@ -197,11 +230,14 @@ impl<
       }
     }
 
+    let conditions = self
+      .conditions_from_resolution_mode
+      .resolve(resolution_mode);
     let url = self.module_resolve(
       specifier,
       referrer,
       resolution_mode,
-      conditions_from_resolution_mode(resolution_mode),
+      conditions,
       resolution_kind,
     )?;
 
@@ -211,6 +247,7 @@ impl<
         &file_path,
         Some(referrer),
         resolution_mode,
+        conditions,
       )?
     } else {
       url
@@ -343,7 +380,9 @@ impl<
       &package_subpath,
       maybe_referrer,
       resolution_mode,
-      conditions_from_resolution_mode(resolution_mode),
+      self
+        .conditions_from_resolution_mode
+        .resolve(resolution_mode),
       resolution_kind,
     )?;
     // TODO(bartlomieju): skipped checking errors for commonJS resolution and
@@ -411,6 +450,7 @@ impl<
     path: &Path,
     maybe_referrer: Option<&Url>,
     resolution_mode: ResolutionMode,
+    conditions: &[&str],
   ) -> Result<Url, TypesNotFoundError> {
     fn probe_extensions<TSys: FsMetadata>(
       sys: &TSys,
@@ -474,7 +514,7 @@ impl<
         /* sub path */ ".",
         maybe_referrer,
         resolution_mode,
-        conditions_from_resolution_mode(resolution_mode),
+        conditions,
         NodeResolutionKind::Types,
       );
       if let Ok(resolution) = resolution_result {
@@ -855,6 +895,7 @@ impl<
           &path,
           maybe_referrer,
           resolution_mode,
+          conditions,
         )?));
       } else {
         return Ok(Some(url));
@@ -1212,6 +1253,7 @@ impl<
           package_subpath,
           maybe_referrer,
           resolution_mode,
+          conditions,
           resolution_kind,
         )
         .map_err(|err| {
@@ -1249,6 +1291,7 @@ impl<
                 package_json,
                 referrer,
                 resolution_mode,
+                conditions,
                 resolution_kind,
               )
               .map_err(|err| {
@@ -1268,6 +1311,7 @@ impl<
           package_json,
           referrer,
           resolution_mode,
+          conditions,
           resolution_kind,
         )
         .map_err(|err| {
@@ -1281,6 +1325,7 @@ impl<
         package_subpath,
         referrer,
         resolution_mode,
+        conditions,
         resolution_kind,
       )
       .map_err(|err| {
@@ -1294,12 +1339,18 @@ impl<
     package_subpath: &str,
     referrer: Option<&Url>,
     resolution_mode: ResolutionMode,
+    conditions: &[&str],
     resolution_kind: NodeResolutionKind,
   ) -> Result<Url, TypesNotFoundError> {
     assert_ne!(package_subpath, ".");
     let file_path = directory.join(package_subpath);
     if resolution_kind.is_types() {
-      Ok(self.path_to_declaration_url(&file_path, referrer, resolution_mode)?)
+      Ok(self.path_to_declaration_url(
+        &file_path,
+        referrer,
+        resolution_mode,
+        conditions,
+      )?)
     } else {
       Ok(url_from_file_path(&file_path).unwrap())
     }
@@ -1311,6 +1362,7 @@ impl<
     package_subpath: &str,
     maybe_referrer: Option<&Url>,
     resolution_mode: ResolutionMode,
+    conditions: &[&str],
     resolution_kind: NodeResolutionKind,
   ) -> Result<Url, LegacyResolveError> {
     if package_subpath == "." {
@@ -1327,6 +1379,7 @@ impl<
           package_subpath,
           maybe_referrer,
           resolution_mode,
+          conditions,
           resolution_kind,
         )
         .map_err(|err| err.into())
@@ -1338,6 +1391,7 @@ impl<
     package_json: &PackageJson,
     maybe_referrer: Option<&Url>,
     resolution_mode: ResolutionMode,
+    conditions: &[&str],
     resolution_kind: NodeResolutionKind,
   ) -> Result<Url, LegacyResolveError> {
     let pkg_json_kind = match resolution_mode {
@@ -1356,6 +1410,7 @@ impl<
               &main,
               maybe_referrer,
               resolution_mode,
+              conditions,
             );
             // don't surface errors, fallback to checking the index now
             if let Ok(url) = decl_url_result {