diff --git a/Cargo.lock b/Cargo.lock
index d55c1a19aa..e94fd48410 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2096,12 +2096,10 @@ dependencies = [
 name = "deno_npm_cache"
 version = "0.3.0"
 dependencies = [
- "anyhow",
  "async-trait",
  "base64 0.21.7",
  "boxed_error",
  "deno_cache_dir",
- "deno_core",
  "deno_error",
  "deno_npm",
  "deno_path_util",
@@ -2197,16 +2195,20 @@ name = "deno_resolver"
 version = "0.15.0"
 dependencies = [
  "anyhow",
+ "async-trait",
  "base32",
  "boxed_error",
  "dashmap",
+ "deno_cache_dir",
  "deno_config",
  "deno_error",
  "deno_media_type",
+ "deno_npm",
  "deno_package_json",
  "deno_path_util",
  "deno_semver",
  "node_resolver",
+ "parking_lot",
  "sys_traits",
  "test_server",
  "thiserror 2.0.3",
diff --git a/cli/http_util.rs b/cli/http_util.rs
index 19d9071833..5e63ab0a4a 100644
--- a/cli/http_util.rs
+++ b/cli/http_util.rs
@@ -70,7 +70,7 @@ impl HttpClientProvider {
     }
   }
 
-  pub fn get_or_create(&self) -> Result<HttpClient, AnyError> {
+  pub fn get_or_create(&self) -> Result<HttpClient, JsErrorBox> {
     use std::collections::hash_map::Entry;
     let thread_id = std::thread::current().id();
     let mut clients = self.clients_by_thread_id.lock();
@@ -87,7 +87,8 @@ impl HttpClientProvider {
             },
             ..self.options.clone()
           },
-        )?;
+        )
+        .map_err(JsErrorBox::from_err)?;
         entry.insert(client.clone());
         Ok(HttpClient::new(client))
       }
diff --git a/cli/npm/managed/installer.rs b/cli/npm/managed/installer.rs
index 30ac807023..9f1cc05968 100644
--- a/cli/npm/managed/installer.rs
+++ b/cli/npm/managed/installer.rs
@@ -13,13 +13,13 @@ use deno_npm::resolution::AddPkgReqsOptions;
 use deno_npm::resolution::NpmResolutionError;
 use deno_npm::resolution::NpmResolutionSnapshot;
 use deno_npm::NpmResolutionPackage;
+use deno_resolver::npm::managed::NpmResolution;
 use deno_semver::jsr::JsrDepPackageReq;
 use deno_semver::package::PackageNv;
 use deno_semver::package::PackageReq;
 use deno_semver::SmallStackString;
 use deno_semver::VersionReq;
 
-use super::resolution::NpmResolution;
 use crate::args::CliLockfile;
 use crate::npm::CliNpmRegistryInfoProvider;
 use crate::util::sync::TaskQueue;
diff --git a/cli/npm/managed/installers/global.rs b/cli/npm/managed/installers/global.rs
index d637c96122..477d73dbfb 100644
--- a/cli/npm/managed/installers/global.rs
+++ b/cli/npm/managed/installers/global.rs
@@ -11,8 +11,8 @@ use deno_core::futures::StreamExt;
 use deno_error::JsErrorBox;
 use deno_npm::NpmResolutionPackage;
 use deno_npm::NpmSystemInfo;
+use deno_resolver::npm::managed::NpmResolution;
 
-use super::super::resolution::NpmResolution;
 use super::common::lifecycle_scripts::LifecycleScriptsStrategy;
 use super::common::NpmPackageFsInstaller;
 use crate::args::LifecycleScriptsConfig;
diff --git a/cli/npm/managed/installers/local.rs b/cli/npm/managed/installers/local.rs
index e2c5653801..a8efaaeb00 100644
--- a/cli/npm/managed/installers/local.rs
+++ b/cli/npm/managed/installers/local.rs
@@ -24,19 +24,19 @@ use deno_npm::resolution::NpmResolutionSnapshot;
 use deno_npm::NpmResolutionPackage;
 use deno_npm::NpmSystemInfo;
 use deno_path_util::fs::atomic_write_file_with_retries;
+use deno_resolver::npm::get_package_folder_id_folder_name;
+use deno_resolver::npm::managed::NpmResolution;
 use deno_semver::package::PackageNv;
 use deno_semver::StackString;
 use serde::Deserialize;
 use serde::Serialize;
 
-use super::super::resolution::NpmResolution;
 use super::common::bin_entries;
 use super::common::NpmPackageFsInstaller;
 use crate::args::LifecycleScriptsConfig;
 use crate::args::NpmInstallDepsProvider;
 use crate::cache::CACHE_PERM;
 use crate::colors;
-use crate::npm::managed::resolvers::get_package_folder_id_folder_name;
 use crate::npm::managed::PackageCaching;
 use crate::npm::CliNpmCache;
 use crate::npm::CliNpmTarballCache;
diff --git a/cli/npm/managed/installers/mod.rs b/cli/npm/managed/installers/mod.rs
index 4514fa1ec3..39e0d6f77c 100644
--- a/cli/npm/managed/installers/mod.rs
+++ b/cli/npm/managed/installers/mod.rs
@@ -4,11 +4,11 @@ use std::path::PathBuf;
 use std::sync::Arc;
 
 use deno_npm::NpmSystemInfo;
+use deno_resolver::npm::managed::NpmResolution;
 
 pub use self::common::NpmPackageFsInstaller;
 use self::global::GlobalNpmPackageInstaller;
 use self::local::LocalNpmPackageInstaller;
-use super::resolution::NpmResolution;
 use crate::args::LifecycleScriptsConfig;
 use crate::args::NpmInstallDepsProvider;
 use crate::npm::CliNpmCache;
diff --git a/cli/npm/managed/mod.rs b/cli/npm/managed/mod.rs
index 6729a56b1e..5950af948c 100644
--- a/cli/npm/managed/mod.rs
+++ b/cli/npm/managed/mod.rs
@@ -23,6 +23,10 @@ use deno_npm::NpmResolutionPackage;
 use deno_npm::NpmSystemInfo;
 use deno_npm_cache::NpmCacheSetting;
 use deno_path_util::fs::canonicalize_path_maybe_not_exists;
+use deno_resolver::npm::managed::create_npm_fs_resolver;
+use deno_resolver::npm::managed::NpmPackageFsResolver;
+use deno_resolver::npm::managed::NpmPackageFsResolverPackageFolderError;
+use deno_resolver::npm::managed::NpmResolution;
 use deno_resolver::npm::CliNpmReqResolver;
 use deno_runtime::colors;
 use deno_runtime::ops::process::NpmProcessStateProvider;
@@ -37,9 +41,6 @@ use node_resolver::errors::PackageFolderResolveIoError;
 use node_resolver::InNpmPackageChecker;
 use node_resolver::NpmPackageFolderResolver;
 
-use self::resolution::NpmResolution;
-use self::resolvers::create_npm_fs_resolver;
-use self::resolvers::NpmPackageFsResolver;
 use super::CliNpmCache;
 use super::CliNpmCacheHttpClient;
 use super::CliNpmRegistryInfoProvider;
@@ -60,8 +61,6 @@ use crate::util::sync::AtomicFlag;
 
 mod installer;
 mod installers;
-mod resolution;
-mod resolvers;
 
 pub enum CliNpmResolverManagedSnapshotOption {
   ResolveFromLockfile(Arc<CliLockfile>),
@@ -104,6 +103,7 @@ pub async fn create_managed_npm_resolver_for_lsp(
     create_inner(
       http_client,
       npm_cache,
+      options.npm_cache_dir,
       options.npm_install_deps_provider,
       npm_api,
       options.sys,
@@ -133,6 +133,7 @@ pub async fn create_managed_npm_resolver(
   Ok(create_inner(
     http_client,
     npm_cache,
+    options.npm_cache_dir,
     options.npm_install_deps_provider,
     api,
     options.sys,
@@ -150,6 +151,7 @@ pub async fn create_managed_npm_resolver(
 fn create_inner(
   http_client: Arc<CliNpmCacheHttpClient>,
   npm_cache: Arc<CliNpmCache>,
+  npm_cache_dir: Arc<NpmCacheDir>,
   npm_install_deps_provider: Arc<NpmInstallDepsProvider>,
   registry_info_provider: Arc<CliNpmRegistryInfoProvider>,
   sys: CliSys,
@@ -181,7 +183,8 @@ fn create_inner(
     lifecycle_scripts.clone(),
   );
   let fs_resolver = create_npm_fs_resolver(
-    npm_cache.clone(),
+    &npm_cache_dir,
+    &npm_rc,
     resolution.clone(),
     sys.clone(),
     node_modules_dir_path,
@@ -192,7 +195,9 @@ fn create_inner(
     maybe_lockfile,
     registry_info_provider,
     npm_cache,
+    npm_cache_dir,
     npm_install_deps_provider,
+    npm_rc,
     resolution,
     sys,
     tarball_cache,
@@ -314,7 +319,9 @@ pub struct ManagedCliNpmResolver {
   maybe_lockfile: Option<Arc<CliLockfile>>,
   registry_info_provider: Arc<CliNpmRegistryInfoProvider>,
   npm_cache: Arc<CliNpmCache>,
+  npm_cache_dir: Arc<NpmCacheDir>,
   npm_install_deps_provider: Arc<NpmInstallDepsProvider>,
+  npm_rc: Arc<ResolvedNpmRc>,
   sys: CliSys,
   resolution: Arc<NpmResolution>,
   resolution_installer: NpmResolutionInstaller,
@@ -338,7 +345,7 @@ pub enum ResolvePkgFolderFromPkgIdError {
   #[class(inherit)]
   #[error("{0}")]
   NpmPackageFsResolverPackageFolder(
-    #[from] resolvers::NpmPackageFsResolverPackageFolderError,
+    #[from] NpmPackageFsResolverPackageFolderError,
   ),
   #[class(inherit)]
   #[error("{0}")]
@@ -363,7 +370,9 @@ impl ManagedCliNpmResolver {
     maybe_lockfile: Option<Arc<CliLockfile>>,
     registry_info_provider: Arc<CliNpmRegistryInfoProvider>,
     npm_cache: Arc<CliNpmCache>,
+    npm_cache_dir: Arc<NpmCacheDir>,
     npm_install_deps_provider: Arc<NpmInstallDepsProvider>,
+    npm_rc: Arc<ResolvedNpmRc>,
     resolution: Arc<NpmResolution>,
     sys: CliSys,
     tarball_cache: Arc<CliNpmTarballCache>,
@@ -382,7 +391,9 @@ impl ManagedCliNpmResolver {
       maybe_lockfile,
       registry_info_provider,
       npm_cache,
+      npm_cache_dir,
       npm_install_deps_provider,
+      npm_rc,
       text_only_progress_bar,
       resolution,
       resolution_installer,
@@ -671,11 +682,11 @@ impl ManagedCliNpmResolver {
   }
 
   pub fn global_cache_root_path(&self) -> &Path {
-    self.npm_cache.root_dir_path()
+    self.npm_cache_dir.root_dir()
   }
 
   pub fn global_cache_root_url(&self) -> &Url {
-    self.npm_cache.root_dir_url()
+    self.npm_cache_dir.root_dir_url()
   }
 }
 
@@ -772,7 +783,8 @@ impl CliNpmResolver for ManagedCliNpmResolver {
         self.lifecycle_scripts.clone(),
       ),
       create_npm_fs_resolver(
-        self.npm_cache.clone(),
+        &self.npm_cache_dir,
+        &self.npm_rc,
         npm_resolution.clone(),
         self.sys.clone(),
         self.root_node_modules_path().map(ToOwned::to_owned),
@@ -780,7 +792,9 @@ impl CliNpmResolver for ManagedCliNpmResolver {
       self.maybe_lockfile.clone(),
       self.registry_info_provider.clone(),
       self.npm_cache.clone(),
+      self.npm_cache_dir.clone(),
       self.npm_install_deps_provider.clone(),
+      self.npm_rc.clone(),
       npm_resolution,
       self.sys.clone(),
       self.tarball_cache.clone(),
diff --git a/cli/npm/managed/resolvers/mod.rs b/cli/npm/managed/resolvers/mod.rs
deleted file mode 100644
index 8a89208c77..0000000000
--- a/cli/npm/managed/resolvers/mod.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2018-2025 the Deno authors. MIT license.
-
-mod common;
-mod global;
-mod local;
-
-use std::path::PathBuf;
-use std::sync::Arc;
-
-pub use self::common::NpmPackageFsResolver;
-pub use self::common::NpmPackageFsResolverPackageFolderError;
-use self::global::GlobalNpmPackageResolver;
-pub use self::local::get_package_folder_id_folder_name;
-use self::local::LocalNpmPackageResolver;
-use super::resolution::NpmResolution;
-use crate::npm::CliNpmCache;
-use crate::sys::CliSys;
-
-pub fn create_npm_fs_resolver(
-  npm_cache: Arc<CliNpmCache>,
-  resolution: Arc<NpmResolution>,
-  sys: CliSys,
-  maybe_node_modules_path: Option<PathBuf>,
-) -> Arc<dyn NpmPackageFsResolver> {
-  match maybe_node_modules_path {
-    Some(node_modules_folder) => Arc::new(LocalNpmPackageResolver::new(
-      resolution,
-      sys,
-      node_modules_folder,
-    )),
-    None => Arc::new(GlobalNpmPackageResolver::new(npm_cache, resolution)),
-  }
-}
diff --git a/cli/npm/mod.rs b/cli/npm/mod.rs
index d66b3e618f..56032e1a0b 100644
--- a/cli/npm/mod.rs
+++ b/cli/npm/mod.rs
@@ -11,6 +11,7 @@ use dashmap::DashMap;
 use deno_core::error::AnyError;
 use deno_core::serde_json;
 use deno_core::url::Url;
+use deno_error::JsErrorBox;
 use deno_npm::npm_rc::ResolvedNpmRc;
 use deno_npm::registry::NpmPackageInfo;
 use deno_resolver::npm::ByonmInNpmPackageChecker;
@@ -100,7 +101,7 @@ impl deno_npm_cache::NpmCacheHttpClient for CliNpmCacheHttpClient {
         };
         deno_npm_cache::DownloadError {
           status_code,
-          error: err.into(),
+          error: JsErrorBox::from_err(err),
         }
       })
   }
diff --git a/resolvers/deno/Cargo.toml b/resolvers/deno/Cargo.toml
index 0eeec14e77..059fdbc08e 100644
--- a/resolvers/deno/Cargo.toml
+++ b/resolvers/deno/Cargo.toml
@@ -18,18 +18,20 @@ sync = ["dashmap"]
 
 [dependencies]
 anyhow.workspace = true
+async-trait.workspace = true
 base32.workspace = true
 boxed_error.workspace = true
 dashmap = { workspace = true, optional = true }
+deno_cache_dir.workspace = true
 deno_config.workspace = true
 deno_error.workspace = true
 deno_media_type.workspace = true
-deno_package_json.workspace = true
-deno_package_json.features = ["sync"]
+deno_npm.workspace = true
+deno_package_json = { workspace = true, features = ["sync"] }
 deno_path_util.workspace = true
 deno_semver.workspace = true
-node_resolver.workspace = true
-node_resolver.features = ["sync"]
+node_resolver = { workspace = true, features = ["sync"] }
+parking_lot.workspace = true
 sys_traits.workspace = true
 thiserror.workspace = true
 url.workspace = true
diff --git a/resolvers/deno/lib.rs b/resolvers/deno/lib.rs
index 49b2cf4d1b..12d8effc46 100644
--- a/resolvers/deno/lib.rs
+++ b/resolvers/deno/lib.rs
@@ -6,12 +6,14 @@
 use std::path::PathBuf;
 
 use boxed_error::Boxed;
+use deno_cache_dir::npm::NpmCacheDir;
 use deno_config::workspace::MappedResolution;
 use deno_config::workspace::MappedResolutionDiagnostic;
 use deno_config::workspace::MappedResolutionError;
 use deno_config::workspace::WorkspaceResolvePkgJsonFolderError;
 use deno_config::workspace::WorkspaceResolver;
 use deno_error::JsError;
+use deno_npm::npm_rc::ResolvedNpmRc;
 use deno_package_json::PackageJsonDepValue;
 use deno_package_json::PackageJsonDepValueParseError;
 use deno_semver::npm::NpmPackageReqReference;
@@ -47,6 +49,12 @@ mod sync;
 #[allow(clippy::disallowed_types)]
 pub type WorkspaceResolverRc = crate::sync::MaybeArc<WorkspaceResolver>;
 
+#[allow(clippy::disallowed_types)]
+pub(crate) type ResolvedNpmRcRc = crate::sync::MaybeArc<ResolvedNpmRc>;
+
+#[allow(clippy::disallowed_types)]
+pub(crate) type NpmCacheDirRc = crate::sync::MaybeArc<NpmCacheDir>;
+
 #[derive(Debug, Clone)]
 pub struct DenoResolution {
   pub url: Url,
diff --git a/resolvers/deno/npm/local.rs b/resolvers/deno/npm/local.rs
index 6322a4b3f7..b05864b856 100644
--- a/resolvers/deno/npm/local.rs
+++ b/resolvers/deno/npm/local.rs
@@ -2,6 +2,58 @@
 
 use std::borrow::Cow;
 
+use deno_cache_dir::npm::mixed_case_package_name_decode;
+use deno_npm::NpmPackageCacheFolderId;
+use deno_semver::package::PackageNv;
+use deno_semver::StackString;
+
+#[inline]
+pub fn get_package_folder_id_folder_name(
+  folder_id: &NpmPackageCacheFolderId,
+) -> String {
+  get_package_folder_id_folder_name_from_parts(
+    &folder_id.nv,
+    folder_id.copy_index,
+  )
+}
+
+pub fn get_package_folder_id_folder_name_from_parts(
+  nv: &PackageNv,
+  copy_index: u8,
+) -> String {
+  let copy_str = if copy_index == 0 {
+    Cow::Borrowed("")
+  } else {
+    Cow::Owned(format!("_{}", copy_index))
+  };
+  let name = normalize_pkg_name_for_node_modules_deno_folder(&nv.name);
+  format!("{}@{}{}", name, nv.version, copy_str)
+}
+
+pub fn get_package_folder_id_from_folder_name(
+  folder_name: &str,
+) -> Option<NpmPackageCacheFolderId> {
+  let folder_name = folder_name.replace('+', "/");
+  let (name, ending) = folder_name.rsplit_once('@')?;
+  let name: StackString = if let Some(encoded_name) = name.strip_prefix('_') {
+    StackString::from_string(mixed_case_package_name_decode(encoded_name)?)
+  } else {
+    name.into()
+  };
+  let (raw_version, copy_index) = match ending.split_once('_') {
+    Some((raw_version, copy_index)) => {
+      let copy_index = copy_index.parse::<u8>().ok()?;
+      (raw_version, copy_index)
+    }
+    None => (ending, 0),
+  };
+  let version = deno_semver::Version::parse_from_npm(raw_version).ok()?;
+  Some(NpmPackageCacheFolderId {
+    nv: PackageNv { name, version },
+    copy_index,
+  })
+}
+
 /// Normalizes a package name for use at `node_modules/.deno/<pkg-name>@<version>[_<copy_index>]`
 pub fn normalize_pkg_name_for_node_modules_deno_folder(name: &str) -> Cow<str> {
   let name = if name.to_lowercase() == name {
@@ -25,3 +77,36 @@ fn mixed_case_package_name_encode(name: &str) -> String {
   )
   .to_lowercase()
 }
+
+#[cfg(test)]
+mod test {
+  use deno_npm::NpmPackageCacheFolderId;
+  use deno_semver::package::PackageNv;
+
+  use super::*;
+
+  #[test]
+  fn test_get_package_folder_id_folder_name() {
+    let cases = vec![
+      (
+        NpmPackageCacheFolderId {
+          nv: PackageNv::from_str("@types/foo@1.2.3").unwrap(),
+          copy_index: 1,
+        },
+        "@types+foo@1.2.3_1".to_string(),
+      ),
+      (
+        NpmPackageCacheFolderId {
+          nv: PackageNv::from_str("JSON@3.2.1").unwrap(),
+          copy_index: 0,
+        },
+        "_jjju6tq@3.2.1".to_string(),
+      ),
+    ];
+    for (input, output) in cases {
+      assert_eq!(get_package_folder_id_folder_name(&input), output);
+      let folder_id = get_package_folder_id_from_folder_name(&output).unwrap();
+      assert_eq!(folder_id, input);
+    }
+  }
+}
diff --git a/cli/npm/managed/resolvers/common.rs b/resolvers/deno/npm/managed/common.rs
similarity index 87%
rename from cli/npm/managed/resolvers/common.rs
rename to resolvers/deno/npm/managed/common.rs
index be0b40fa2a..23ed63e2f0 100644
--- a/cli/npm/managed/resolvers/common.rs
+++ b/resolvers/deno/npm/managed/common.rs
@@ -4,10 +4,14 @@ use std::path::Path;
 use std::path::PathBuf;
 
 use async_trait::async_trait;
-use deno_ast::ModuleSpecifier;
 use deno_npm::NpmPackageCacheFolderId;
 use deno_npm::NpmPackageId;
 use node_resolver::errors::PackageFolderResolveError;
+use url::Url;
+
+#[allow(clippy::disallowed_types)]
+pub(super) type NpmPackageFsResolverRc =
+  crate::sync::MaybeArc<dyn NpmPackageFsResolver>;
 
 #[derive(Debug, thiserror::Error, deno_error::JsError)]
 #[class(generic)]
@@ -34,11 +38,11 @@ pub trait NpmPackageFsResolver: Send + Sync {
   fn resolve_package_folder_from_package(
     &self,
     name: &str,
-    referrer: &ModuleSpecifier,
+    referrer: &Url,
   ) -> Result<PathBuf, PackageFolderResolveError>;
 
   fn resolve_package_cache_folder_id_from_specifier(
     &self,
-    specifier: &ModuleSpecifier,
+    specifier: &Url,
   ) -> Result<Option<NpmPackageCacheFolderId>, std::io::Error>;
 }
diff --git a/cli/npm/managed/resolvers/global.rs b/resolvers/deno/npm/managed/global.rs
similarity index 62%
rename from cli/npm/managed/resolvers/global.rs
rename to resolvers/deno/npm/managed/global.rs
index d63d3a7e45..16a2bc7a70 100644
--- a/cli/npm/managed/resolvers/global.rs
+++ b/resolvers/deno/npm/managed/global.rs
@@ -4,30 +4,60 @@
 
 use std::path::Path;
 use std::path::PathBuf;
-use std::sync::Arc;
 
 use async_trait::async_trait;
-use deno_ast::ModuleSpecifier;
 use deno_npm::NpmPackageCacheFolderId;
 use deno_npm::NpmPackageId;
+use deno_semver::package::PackageNv;
+use deno_semver::StackString;
+use deno_semver::Version;
 use node_resolver::errors::PackageFolderResolveError;
 use node_resolver::errors::PackageNotFoundError;
 use node_resolver::errors::ReferrerNotFoundError;
+use url::Url;
 
-use super::super::resolution::NpmResolution;
-use super::common::NpmPackageFsResolver;
-use crate::npm::CliNpmCache;
+use super::resolution::NpmResolutionRc;
+use super::NpmCacheDirRc;
+use super::NpmPackageFsResolver;
+use crate::ResolvedNpmRcRc;
 
 /// Resolves packages from the global npm cache.
 #[derive(Debug)]
 pub struct GlobalNpmPackageResolver {
-  cache: Arc<CliNpmCache>,
-  resolution: Arc<NpmResolution>,
+  cache: NpmCacheDirRc,
+  npm_rc: ResolvedNpmRcRc,
+  resolution: NpmResolutionRc,
 }
 
 impl GlobalNpmPackageResolver {
-  pub fn new(cache: Arc<CliNpmCache>, resolution: Arc<NpmResolution>) -> Self {
-    Self { cache, resolution }
+  pub fn new(
+    cache: NpmCacheDirRc,
+    npm_rc: ResolvedNpmRcRc,
+    resolution: NpmResolutionRc,
+  ) -> Self {
+    Self {
+      cache,
+      npm_rc,
+      resolution,
+    }
+  }
+
+  fn resolve_package_cache_folder_id_from_specifier_inner(
+    &self,
+    specifier: &Url,
+  ) -> Option<NpmPackageCacheFolderId> {
+    self
+      .cache
+      .resolve_package_folder_id_from_specifier(specifier)
+      .and_then(|cache_id| {
+        Some(NpmPackageCacheFolderId {
+          nv: PackageNv {
+            name: StackString::from_string(cache_id.name),
+            version: Version::parse_from_npm(&cache_id.version).ok()?,
+          },
+          copy_index: cache_id.copy_index,
+        })
+      })
   }
 }
 
@@ -38,21 +68,26 @@ impl NpmPackageFsResolver for GlobalNpmPackageResolver {
   }
 
   fn maybe_package_folder(&self, id: &NpmPackageId) -> Option<PathBuf> {
-    let folder_id = self
+    let folder_copy_index = self
       .resolution
-      .resolve_pkg_cache_folder_id_from_pkg_id(id)?;
-    Some(self.cache.package_folder_for_id(&folder_id))
+      .resolve_pkg_cache_folder_copy_index_from_pkg_id(id)?;
+    let registry_url = self.npm_rc.get_registry_url(&id.nv.name);
+    Some(self.cache.package_folder_for_id(
+      &id.nv.name,
+      &id.nv.version.to_string(),
+      folder_copy_index,
+      registry_url,
+    ))
   }
 
   fn resolve_package_folder_from_package(
     &self,
     name: &str,
-    referrer: &ModuleSpecifier,
+    referrer: &Url,
   ) -> Result<PathBuf, PackageFolderResolveError> {
     use deno_npm::resolution::PackageNotFoundFromReferrerError;
-    let Some(referrer_cache_folder_id) = self
-      .cache
-      .resolve_package_folder_id_from_specifier(referrer)
+    let Some(referrer_cache_folder_id) =
+      self.resolve_package_cache_folder_id_from_specifier_inner(referrer)
     else {
       return Err(
         ReferrerNotFoundError {
@@ -106,12 +141,8 @@ impl NpmPackageFsResolver for GlobalNpmPackageResolver {
 
   fn resolve_package_cache_folder_id_from_specifier(
     &self,
-    specifier: &ModuleSpecifier,
+    specifier: &Url,
   ) -> Result<Option<NpmPackageCacheFolderId>, std::io::Error> {
-    Ok(
-      self
-        .cache
-        .resolve_package_folder_id_from_specifier(specifier),
-    )
+    Ok(self.resolve_package_cache_folder_id_from_specifier_inner(specifier))
   }
 }
diff --git a/cli/npm/managed/resolvers/local.rs b/resolvers/deno/npm/managed/local.rs
similarity index 61%
rename from cli/npm/managed/resolvers/local.rs
rename to resolvers/deno/npm/managed/local.rs
index 52d5ac5a9e..e84de964ad 100644
--- a/cli/npm/managed/resolvers/local.rs
+++ b/resolvers/deno/npm/managed/local.rs
@@ -5,49 +5,50 @@
 use std::borrow::Cow;
 use std::path::Path;
 use std::path::PathBuf;
-use std::sync::Arc;
 
 use async_trait::async_trait;
-use deno_ast::ModuleSpecifier;
-use deno_cache_dir::npm::mixed_case_package_name_decode;
-use deno_core::url::Url;
 use deno_npm::NpmPackageCacheFolderId;
 use deno_npm::NpmPackageId;
 use deno_path_util::fs::canonicalize_path_maybe_not_exists;
-use deno_resolver::npm::normalize_pkg_name_for_node_modules_deno_folder;
-use deno_semver::package::PackageNv;
-use deno_semver::StackString;
+use deno_path_util::url_from_directory_path;
 use node_resolver::errors::PackageFolderResolveError;
 use node_resolver::errors::PackageFolderResolveIoError;
 use node_resolver::errors::PackageNotFoundError;
 use node_resolver::errors::ReferrerNotFoundError;
+use sys_traits::FsCanonicalize;
 use sys_traits::FsMetadata;
+use url::Url;
 
-use super::super::resolution::NpmResolution;
-use super::common::NpmPackageFsResolver;
-use crate::sys::CliSys;
+use super::resolution::NpmResolutionRc;
+use super::NpmPackageFsResolver;
+use crate::npm::local::get_package_folder_id_folder_name_from_parts;
+use crate::npm::local::get_package_folder_id_from_folder_name;
 
 /// Resolver that creates a local node_modules directory
 /// and resolves packages from it.
 #[derive(Debug)]
-pub struct LocalNpmPackageResolver {
-  resolution: Arc<NpmResolution>,
-  sys: CliSys,
+pub struct LocalNpmPackageResolver<
+  TSys: FsCanonicalize + FsMetadata + Send + Sync,
+> {
+  resolution: NpmResolutionRc,
+  sys: TSys,
   root_node_modules_path: PathBuf,
   root_node_modules_url: Url,
 }
 
-impl LocalNpmPackageResolver {
+impl<TSys: FsCanonicalize + FsMetadata + Send + Sync>
+  LocalNpmPackageResolver<TSys>
+{
   #[allow(clippy::too_many_arguments)]
   pub fn new(
-    resolution: Arc<NpmResolution>,
-    sys: CliSys,
+    resolution: NpmResolutionRc,
+    sys: TSys,
     node_modules_folder: PathBuf,
   ) -> Self {
     Self {
       resolution,
       sys,
-      root_node_modules_url: Url::from_directory_path(&node_modules_folder)
+      root_node_modules_url: url_from_directory_path(&node_modules_folder)
         .unwrap(),
       root_node_modules_path: node_modules_folder,
     }
@@ -67,7 +68,7 @@ impl LocalNpmPackageResolver {
 
   fn resolve_folder_for_specifier(
     &self,
-    specifier: &ModuleSpecifier,
+    specifier: &Url,
   ) -> Result<Option<PathBuf>, std::io::Error> {
     let Some(relative_url) =
       self.root_node_modules_url.make_relative(specifier)
@@ -78,7 +79,7 @@ impl LocalNpmPackageResolver {
       return Ok(None);
     }
     // it's within the directory, so use it
-    let Some(path) = specifier.to_file_path().ok() else {
+    let Some(path) = deno_path_util::url_to_file_path(specifier).ok() else {
       return Ok(None);
     };
     // Canonicalize the path so it's not pointing to the symlinked directory
@@ -88,7 +89,7 @@ impl LocalNpmPackageResolver {
 
   fn resolve_package_folder_from_specifier(
     &self,
-    specifier: &ModuleSpecifier,
+    specifier: &Url,
   ) -> Result<Option<PathBuf>, std::io::Error> {
     let Some(local_path) = self.resolve_folder_for_specifier(specifier)? else {
       return Ok(None);
@@ -99,31 +100,36 @@ impl LocalNpmPackageResolver {
 }
 
 #[async_trait(?Send)]
-impl NpmPackageFsResolver for LocalNpmPackageResolver {
+impl<TSys: FsCanonicalize + FsMetadata + Send + Sync> NpmPackageFsResolver
+  for LocalNpmPackageResolver<TSys>
+{
   fn node_modules_path(&self) -> Option<&Path> {
     Some(self.root_node_modules_path.as_ref())
   }
 
   fn maybe_package_folder(&self, id: &NpmPackageId) -> Option<PathBuf> {
-    let cache_folder_id = self
+    let folder_copy_index = self
       .resolution
-      .resolve_pkg_cache_folder_id_from_pkg_id(id)?;
+      .resolve_pkg_cache_folder_copy_index_from_pkg_id(id)?;
     // package is stored at:
     // node_modules/.deno/<package_cache_folder_id_folder_name>/node_modules/<package_name>
     Some(
       self
         .root_node_modules_path
         .join(".deno")
-        .join(get_package_folder_id_folder_name(&cache_folder_id))
+        .join(get_package_folder_id_folder_name_from_parts(
+          &id.nv,
+          folder_copy_index,
+        ))
         .join("node_modules")
-        .join(&cache_folder_id.nv.name),
+        .join(&id.nv.name),
     )
   }
 
   fn resolve_package_folder_from_package(
     &self,
     name: &str,
-    referrer: &ModuleSpecifier,
+    referrer: &Url,
   ) -> Result<PathBuf, PackageFolderResolveError> {
     let maybe_local_path = self
       .resolve_folder_for_specifier(referrer)
@@ -173,7 +179,7 @@ impl NpmPackageFsResolver for LocalNpmPackageResolver {
 
   fn resolve_package_cache_folder_id_from_specifier(
     &self,
-    specifier: &ModuleSpecifier,
+    specifier: &Url,
   ) -> Result<Option<NpmPackageCacheFolderId>, std::io::Error> {
     let Some(folder_path) =
       self.resolve_package_folder_from_specifier(specifier)?
@@ -198,43 +204,6 @@ impl NpmPackageFsResolver for LocalNpmPackageResolver {
   }
 }
 
-pub fn get_package_folder_id_folder_name(
-  folder_id: &NpmPackageCacheFolderId,
-) -> String {
-  let copy_str = if folder_id.copy_index == 0 {
-    Cow::Borrowed("")
-  } else {
-    Cow::Owned(format!("_{}", folder_id.copy_index))
-  };
-  let nv = &folder_id.nv;
-  let name = normalize_pkg_name_for_node_modules_deno_folder(&nv.name);
-  format!("{}@{}{}", name, nv.version, copy_str)
-}
-
-fn get_package_folder_id_from_folder_name(
-  folder_name: &str,
-) -> Option<NpmPackageCacheFolderId> {
-  let folder_name = folder_name.replace('+', "/");
-  let (name, ending) = folder_name.rsplit_once('@')?;
-  let name: StackString = if let Some(encoded_name) = name.strip_prefix('_') {
-    StackString::from_string(mixed_case_package_name_decode(encoded_name)?)
-  } else {
-    name.into()
-  };
-  let (raw_version, copy_index) = match ending.split_once('_') {
-    Some((raw_version, copy_index)) => {
-      let copy_index = copy_index.parse::<u8>().ok()?;
-      (raw_version, copy_index)
-    }
-    None => (ending, 0),
-  };
-  let version = deno_semver::Version::parse_from_npm(raw_version).ok()?;
-  Some(NpmPackageCacheFolderId {
-    nv: PackageNv { name, version },
-    copy_index,
-  })
-}
-
 fn join_package_name(path: &Path, package_name: &str) -> PathBuf {
   let mut path = path.to_path_buf();
   // ensure backslashes are used on windows
@@ -243,36 +212,3 @@ fn join_package_name(path: &Path, package_name: &str) -> PathBuf {
   }
   path
 }
-
-#[cfg(test)]
-mod test {
-  use deno_npm::NpmPackageCacheFolderId;
-  use deno_semver::package::PackageNv;
-
-  use super::*;
-
-  #[test]
-  fn test_get_package_folder_id_folder_name() {
-    let cases = vec![
-      (
-        NpmPackageCacheFolderId {
-          nv: PackageNv::from_str("@types/foo@1.2.3").unwrap(),
-          copy_index: 1,
-        },
-        "@types+foo@1.2.3_1".to_string(),
-      ),
-      (
-        NpmPackageCacheFolderId {
-          nv: PackageNv::from_str("JSON@3.2.1").unwrap(),
-          copy_index: 0,
-        },
-        "_jjju6tq@3.2.1".to_string(),
-      ),
-    ];
-    for (input, output) in cases {
-      assert_eq!(get_package_folder_id_folder_name(&input), output);
-      let folder_id = get_package_folder_id_from_folder_name(&output).unwrap();
-      assert_eq!(folder_id, input);
-    }
-  }
-}
diff --git a/resolvers/deno/npm/managed/mod.rs b/resolvers/deno/npm/managed/mod.rs
new file mode 100644
index 0000000000..b460656eab
--- /dev/null
+++ b/resolvers/deno/npm/managed/mod.rs
@@ -0,0 +1,45 @@
+// Copyright 2018-2025 the Deno authors. MIT license.
+
+mod common;
+mod global;
+mod local;
+mod resolution;
+
+use std::path::PathBuf;
+
+use sys_traits::FsCanonicalize;
+use sys_traits::FsMetadata;
+
+pub use self::common::NpmPackageFsResolver;
+pub use self::common::NpmPackageFsResolverPackageFolderError;
+use self::common::NpmPackageFsResolverRc;
+use self::global::GlobalNpmPackageResolver;
+use self::local::LocalNpmPackageResolver;
+pub use self::resolution::NpmResolution;
+use self::resolution::NpmResolutionRc;
+use crate::sync::new_rc;
+use crate::NpmCacheDirRc;
+use crate::ResolvedNpmRcRc;
+
+pub fn create_npm_fs_resolver<
+  TSys: FsCanonicalize + FsMetadata + Send + Sync + 'static,
+>(
+  npm_cache_dir: &NpmCacheDirRc,
+  npm_rc: &ResolvedNpmRcRc,
+  resolution: NpmResolutionRc,
+  sys: TSys,
+  maybe_node_modules_path: Option<PathBuf>,
+) -> NpmPackageFsResolverRc {
+  match maybe_node_modules_path {
+    Some(node_modules_folder) => new_rc(LocalNpmPackageResolver::new(
+      resolution,
+      sys,
+      node_modules_folder,
+    )),
+    None => new_rc(GlobalNpmPackageResolver::new(
+      npm_cache_dir.clone(),
+      npm_rc.clone(),
+      resolution,
+    )),
+  }
+}
diff --git a/cli/npm/managed/resolution.rs b/resolvers/deno/npm/managed/resolution.rs
similarity index 91%
rename from cli/npm/managed/resolution.rs
rename to resolvers/deno/npm/managed/resolution.rs
index 5178c20608..40ab91202c 100644
--- a/cli/npm/managed/resolution.rs
+++ b/resolvers/deno/npm/managed/resolution.rs
@@ -2,7 +2,6 @@
 
 use std::collections::HashMap;
 
-use deno_core::parking_lot::RwLock;
 use deno_npm::resolution::NpmPackagesPartitioned;
 use deno_npm::resolution::NpmResolutionSnapshot;
 use deno_npm::resolution::PackageCacheFolderIdNotFoundError;
@@ -16,10 +15,12 @@ use deno_npm::NpmResolutionPackage;
 use deno_npm::NpmSystemInfo;
 use deno_semver::package::PackageNv;
 use deno_semver::package::PackageReq;
+use parking_lot::RwLock;
 
-/// Handles updating and storing npm resolution in memory where the underlying
-/// snapshot can be updated concurrently. Additionally handles updating the lockfile
-/// based on changes to the resolution.
+#[allow(clippy::disallowed_types)]
+pub(super) type NpmResolutionRc = crate::sync::MaybeArc<NpmResolution>;
+
+/// Handles updating and storing npm resolution in memory.
 ///
 /// This does not interact with the file system.
 pub struct NpmResolution {
@@ -50,15 +51,15 @@ impl NpmResolution {
     }
   }
 
-  pub fn resolve_pkg_cache_folder_id_from_pkg_id(
+  pub fn resolve_pkg_cache_folder_copy_index_from_pkg_id(
     &self,
     id: &NpmPackageId,
-  ) -> Option<NpmPackageCacheFolderId> {
+  ) -> Option<u8> {
     self
       .snapshot
       .read()
       .package_from_id(id)
-      .map(|p| p.get_package_cache_folder_id())
+      .map(|p| p.copy_index)
   }
 
   pub fn resolve_pkg_id_from_pkg_cache_folder_id(
diff --git a/resolvers/deno/npm/mod.rs b/resolvers/deno/npm/mod.rs
index 2e7c4c888b..54282e677d 100644
--- a/resolvers/deno/npm/mod.rs
+++ b/resolvers/deno/npm/mod.rs
@@ -4,15 +4,9 @@ use std::fmt::Debug;
 use std::path::PathBuf;
 
 use boxed_error::Boxed;
-pub use byonm::ByonmInNpmPackageChecker;
-pub use byonm::ByonmNpmResolver;
-pub use byonm::ByonmNpmResolverCreateOptions;
-pub use byonm::ByonmNpmResolverRc;
-pub use byonm::ByonmResolvePkgFolderFromDenoReqError;
 use deno_error::JsError;
 use deno_semver::npm::NpmPackageReqReference;
 use deno_semver::package::PackageReq;
-pub use local::normalize_pkg_name_for_node_modules_deno_folder;
 use node_resolver::errors::NodeResolveError;
 use node_resolver::errors::NodeResolveErrorKind;
 use node_resolver::errors::PackageFolderResolveErrorKind;
@@ -33,8 +27,17 @@ use sys_traits::FsReadDir;
 use thiserror::Error;
 use url::Url;
 
+pub use self::byonm::ByonmInNpmPackageChecker;
+pub use self::byonm::ByonmNpmResolver;
+pub use self::byonm::ByonmNpmResolverCreateOptions;
+pub use self::byonm::ByonmNpmResolverRc;
+pub use self::byonm::ByonmResolvePkgFolderFromDenoReqError;
+pub use self::local::get_package_folder_id_folder_name;
+pub use self::local::normalize_pkg_name_for_node_modules_deno_folder;
+
 mod byonm;
 mod local;
+pub mod managed;
 
 #[derive(Debug, Error, JsError)]
 #[class(generic)]
diff --git a/resolvers/deno/sync.rs b/resolvers/deno/sync.rs
index 43635e62b7..10cdc5ec4d 100644
--- a/resolvers/deno/sync.rs
+++ b/resolvers/deno/sync.rs
@@ -46,3 +46,9 @@ mod inner {
     }
   }
 }
+
+#[allow(clippy::disallowed_types)]
+#[inline]
+pub fn new_rc<T>(value: T) -> MaybeArc<T> {
+  MaybeArc::new(value)
+}
diff --git a/resolvers/npm_cache/Cargo.toml b/resolvers/npm_cache/Cargo.toml
index 328355d340..3cefc6538a 100644
--- a/resolvers/npm_cache/Cargo.toml
+++ b/resolvers/npm_cache/Cargo.toml
@@ -14,11 +14,6 @@ description = "Helpers for downloading and caching npm dependencies for Deno"
 path = "lib.rs"
 
 [dependencies]
-# todo(dsherret): remove this dependency
-anyhow.workspace = true
-# todo(dsherret): remove this dependency
-deno_core.workspace = true
-
 async-trait.workspace = true
 base64.workspace = true
 boxed_error.workspace = true
diff --git a/resolvers/npm_cache/lib.rs b/resolvers/npm_cache/lib.rs
index 90c07de5d5..f0de201b75 100644
--- a/resolvers/npm_cache/lib.rs
+++ b/resolvers/npm_cache/lib.rs
@@ -6,7 +6,6 @@ use std::path::Path;
 use std::path::PathBuf;
 use std::sync::Arc;
 
-use anyhow::Error as AnyError;
 use deno_cache_dir::file_fetcher::CacheSetting;
 use deno_cache_dir::npm::NpmCacheDir;
 use deno_error::JsErrorBox;
@@ -51,7 +50,7 @@ pub use tarball::TarballCache;
 #[class(generic)]
 pub struct DownloadError {
   pub status_code: Option<StatusCode>,
-  pub error: AnyError,
+  pub error: JsErrorBox,
 }
 
 impl std::error::Error for DownloadError {
@@ -312,15 +311,17 @@ impl<
     &self,
     name: &str,
     package_info: &NpmPackageInfo,
-  ) -> Result<(), AnyError> {
+  ) -> Result<(), JsErrorBox> {
     let file_cache_path = self.get_registry_package_info_file_cache_path(name);
-    let file_text = serde_json::to_string(&package_info)?;
+    let file_text =
+      serde_json::to_string(&package_info).map_err(JsErrorBox::from_err)?;
     atomic_write_file_with_retries(
       &self.sys,
       &file_cache_path,
       file_text.as_bytes(),
       0o644,
-    )?;
+    )
+    .map_err(JsErrorBox::from_err)?;
     Ok(())
   }
 
diff --git a/resolvers/npm_cache/registry_info.rs b/resolvers/npm_cache/registry_info.rs
index ece797abba..673f2ff445 100644
--- a/resolvers/npm_cache/registry_info.rs
+++ b/resolvers/npm_cache/registry_info.rs
@@ -5,11 +5,6 @@ use std::collections::HashSet;
 use std::sync::Arc;
 
 use async_trait::async_trait;
-use deno_core::futures::future::LocalBoxFuture;
-use deno_core::futures::FutureExt;
-use deno_core::parking_lot::Mutex;
-use deno_core::serde_json;
-use deno_core::url::Url;
 use deno_error::JsErrorBox;
 use deno_npm::npm_rc::ResolvedNpmRc;
 use deno_npm::registry::NpmPackageInfo;
@@ -17,6 +12,9 @@ use deno_npm::registry::NpmRegistryApi;
 use deno_npm::registry::NpmRegistryPackageInfoLoadError;
 use deno_unsync::sync::AtomicFlag;
 use deno_unsync::sync::MultiRuntimeAsyncValueCreator;
+use futures::future::LocalBoxFuture;
+use futures::FutureExt;
+use parking_lot::Mutex;
 use sys_traits::FsCreateDirAll;
 use sys_traits::FsHardLink;
 use sys_traits::FsMetadata;
@@ -26,6 +24,7 @@ use sys_traits::FsRemoveFile;
 use sys_traits::FsRename;
 use sys_traits::SystemRandom;
 use sys_traits::ThreadSleep;
+use url::Url;
 
 use crate::remote::maybe_auth_header_for_npm_registry;
 use crate::NpmCache;
diff --git a/resolvers/npm_cache/tarball.rs b/resolvers/npm_cache/tarball.rs
index d9575ba9cd..7a9453e655 100644
--- a/resolvers/npm_cache/tarball.rs
+++ b/resolvers/npm_cache/tarball.rs
@@ -3,16 +3,15 @@
 use std::collections::HashMap;
 use std::sync::Arc;
 
-use deno_core::futures::future::LocalBoxFuture;
-use deno_core::futures::FutureExt;
-use deno_core::parking_lot::Mutex;
-use deno_core::url::Url;
 use deno_error::JsErrorBox;
 use deno_npm::npm_rc::ResolvedNpmRc;
 use deno_npm::registry::NpmPackageVersionDistInfo;
 use deno_semver::package::PackageNv;
 use deno_unsync::sync::MultiRuntimeAsyncValueCreator;
+use futures::future::LocalBoxFuture;
+use futures::FutureExt;
 use http::StatusCode;
+use parking_lot::Mutex;
 use sys_traits::FsCreateDirAll;
 use sys_traits::FsHardLink;
 use sys_traits::FsMetadata;
@@ -22,6 +21,7 @@ use sys_traits::FsRemoveFile;
 use sys_traits::FsRename;
 use sys_traits::SystemRandom;
 use sys_traits::ThreadSleep;
+use url::Url;
 
 use crate::remote::maybe_auth_header_for_npm_registry;
 use crate::tarball_extract::verify_and_extract_tarball;
diff --git a/resolvers/npm_cache/todo.md b/resolvers/npm_cache/todo.md
index e10b1cfd89..e460fcae86 100644
--- a/resolvers/npm_cache/todo.md
+++ b/resolvers/npm_cache/todo.md
@@ -1,7 +1,5 @@
 This crate is a work in progress:
 
-1. Remove `deno_core` dependency.
-1. Remove `anyhow` dependency.
 1. Add a clippy.toml file that bans accessing the file system directory and
    instead does it through a trait.
 1. Make this crate work in Wasm.