refactor(loader): extract out more module loading code from cli crate (#30084)

cli/factory.rs

@@ -947,11 +947,10 @@ impl CliFactory {
       in_npm_pkg_checker.clone(),
       self.main_module_graph_container().await?.clone(),
       self.module_load_preparer().await?.clone(),
-      resolver_factory.npm_module_loader()?.clone(),
       npm_registry_permission_checker,
       cli_npm_resolver.clone(),
       resolver_factory.parsed_source_cache().clone(),
-      resolver_factory.prepared_module_loader()?.clone(),
+      resolver_factory.module_loader()?.clone(),
       self.resolver().await?.clone(),
       self.sys(),
       maybe_eszip_loader,

cli/module_loader.rs

@@ -15,12 +15,12 @@ use std::sync::atomic::AtomicU16;
 use std::sync::atomic::Ordering;
 use std::time::SystemTime;
 
-use boxed_error::Boxed;
 use deno_ast::MediaType;
 use deno_ast::ModuleKind;
 use deno_cache_dir::file_fetcher::FetchLocalOptions;
 use deno_core::FastString;
 use deno_core::ModuleLoader;
+use deno_core::ModuleResolutionError;
 use deno_core::ModuleSource;
 use deno_core::ModuleSourceCode;
 use deno_core::ModuleSpecifier;
@@ -50,18 +50,18 @@ use deno_lib::npm::NpmRegistryReadPermissionChecker;
 use deno_lib::util::hash::FastInsecureHasher;
 use deno_lib::worker::CreateModuleLoaderResult;
 use deno_lib::worker::ModuleLoaderFactory;
+use deno_path_util::PathToUrlError;
 use deno_resolver::cache::ParsedSourceCache;
 use deno_resolver::file_fetcher::FetchOptions;
 use deno_resolver::file_fetcher::FetchPermissionsOptionRef;
 use deno_resolver::graph::ResolveWithGraphErrorKind;
 use deno_resolver::graph::ResolveWithGraphOptions;
+use deno_resolver::loader::LoadCodeSourceError;
 use deno_resolver::loader::LoadPreparedModuleError;
 use deno_resolver::loader::LoadedModule;
 use deno_resolver::loader::LoadedModuleOrAsset;
-use deno_resolver::loader::NpmModuleLoadError;
 use deno_resolver::loader::StrippingTypesNodeModulesError;
 use deno_resolver::npm::DenoInNpmPackageChecker;
-use deno_resolver::npm::ResolveNpmReqRefError;
 use deno_runtime::code_cache;
 use deno_runtime::deno_node::NodeRequireLoader;
 use deno_runtime::deno_node::create_host_defined_options;
@@ -103,12 +103,10 @@ use crate::util::progress_bar::ProgressBar;
 use crate::util::text_encoding::code_without_source_map;
 use crate::util::text_encoding::source_map_from_code;
 
-pub type CliNpmModuleLoader =
-  deno_resolver::loader::DenoNpmModuleLoader<CliSys>;
 pub type CliEmitter =
   deno_resolver::emit::Emitter<DenoInNpmPackageChecker, CliSys>;
-pub type CliPreparedModuleLoader =
-  deno_resolver::loader::PreparedModuleLoader<DenoInNpmPackageChecker, CliSys>;
+pub type CliDenoResolverModuleLoader =
+  deno_resolver::loader::ModuleLoader<CliSys>;
 
 #[derive(Debug, thiserror::Error, deno_error::JsError)]
 pub enum PrepareModuleLoadError {
@@ -330,12 +328,11 @@ struct SharedCliModuleLoaderState {
   in_npm_pkg_checker: DenoInNpmPackageChecker,
   main_module_graph_container: Arc<MainModuleGraphContainer>,
   module_load_preparer: Arc<ModuleLoadPreparer>,
-  npm_module_loader: Arc<CliNpmModuleLoader>,
   npm_registry_permission_checker:
     Arc<NpmRegistryReadPermissionChecker<CliSys>>,
   npm_resolver: CliNpmResolver,
   parsed_source_cache: Arc<ParsedSourceCache>,
-  prepared_module_loader: Arc<CliPreparedModuleLoader>,
+  module_loader: Arc<CliDenoResolverModuleLoader>,
   resolver: Arc<CliResolver>,
   sys: CliSys,
   in_flight_loads_tracker: InFlightModuleLoadsTracker,
@@ -392,13 +389,12 @@ impl CliModuleLoaderFactory {
     in_npm_pkg_checker: DenoInNpmPackageChecker,
     main_module_graph_container: Arc<MainModuleGraphContainer>,
     module_load_preparer: Arc<ModuleLoadPreparer>,
-    npm_module_loader: Arc<CliNpmModuleLoader>,
     npm_registry_permission_checker: Arc<
       NpmRegistryReadPermissionChecker<CliSys>,
     >,
     npm_resolver: CliNpmResolver,
     parsed_source_cache: Arc<ParsedSourceCache>,
-    prepared_module_loader: Arc<CliPreparedModuleLoader>,
+    module_loader: Arc<CliDenoResolverModuleLoader>,
     resolver: Arc<CliResolver>,
     sys: CliSys,
     maybe_eszip_loader: Option<Arc<EszipModuleLoader>>,
@@ -421,11 +417,10 @@ impl CliModuleLoaderFactory {
         in_npm_pkg_checker,
         main_module_graph_container,
         module_load_preparer,
-        npm_module_loader,
         npm_registry_permission_checker,
         npm_resolver,
         parsed_source_cache,
-        prepared_module_loader,
+        module_loader,
         resolver,
         sys,
         in_flight_loads_tracker: InFlightModuleLoadsTracker {
@@ -530,14 +525,6 @@ struct ModuleCodeStringSource {
   pub module_type: ModuleType,
 }
 
-#[derive(Debug, thiserror::Error, deno_error::JsError)]
-#[class(generic)]
-#[error("Loading unprepared module: {}{}", .specifier, .maybe_referrer.as_ref().map(|r| format!(", imported from: {}", r)).unwrap_or_default())]
-pub struct LoadUnpreparedModuleError {
-  specifier: ModuleSpecifier,
-  maybe_referrer: Option<ModuleSpecifier>,
-}
-
 struct CliModuleLoaderInner<TGraphContainer: ModuleGraphContainer> {
   lib: TsTypeLib,
   is_worker: bool,
@@ -551,43 +538,30 @@ struct CliModuleLoaderInner<TGraphContainer: ModuleGraphContainer> {
   loaded_files: RefCell<HashSet<ModuleSpecifier>>,
 }
 
-#[derive(Debug, deno_error::JsError, Boxed)]
-#[class(inherit)]
-pub struct LoadCodeSourceError(pub Box<LoadCodeSourceErrorKind>);
-
 #[derive(Debug, thiserror::Error, deno_error::JsError)]
-pub enum LoadCodeSourceErrorKind {
+pub enum ResolveReferrerError {
   #[class(inherit)]
   #[error(transparent)]
-  NpmModuleLoad(#[from] NpmModuleLoadError),
+  UnableToGetCwd(#[from] UnableToGetCwdError),
   #[class(inherit)]
   #[error(transparent)]
-  LoadPreparedModule(#[from] LoadPreparedModuleError),
+  PathToUrl(#[from] PathToUrlError),
   #[class(inherit)]
   #[error(transparent)]
-  LoadUnpreparedModule(#[from] LoadUnpreparedModuleError),
-  #[class(inherit)]
-  #[error(transparent)]
-  Core(#[from] deno_core::error::ModuleLoaderError),
-  #[class(inherit)]
-  #[error(transparent)]
-  PathToUrl(#[from] deno_path_util::PathToUrlError),
-  #[class(inherit)]
-  #[error(transparent)]
-  NpmReqRef(#[from] ResolveNpmReqRefError),
-  #[class(inherit)]
-  #[error(transparent)]
-  Fetch(#[from] deno_resolver::file_fetcher::FetchError),
+  ModuleResolution(#[from] ModuleResolutionError),
 }
 
 #[derive(Debug, thiserror::Error, deno_error::JsError)]
 pub enum CliModuleLoaderError {
+  #[class(inherit)]
+  #[error(transparent)]
+  Fetch(deno_resolver::file_fetcher::FetchError),
   #[class(inherit)]
   #[error(transparent)]
   LoadCodeSource(#[from] LoadCodeSourceError),
   #[class(inherit)]
   #[error(transparent)]
-  LoadPreparedModule(#[from] Box<LoadPreparedModuleError>),
+  LoadPreparedModule(#[from] LoadPreparedModuleError),
   #[class(generic)]
   #[error(
     "Attempted to load JSON module without specifying \"type\": \"json\" attribute in the import statement."
@@ -595,10 +569,13 @@ pub enum CliModuleLoaderError {
   MissingJsonAttribute,
   #[class(inherit)]
   #[error(transparent)]
-  Core(#[from] Box<deno_core::error::ModuleLoaderError>),
+  PathToUrl(#[from] PathToUrlError),
   #[class(inherit)]
   #[error(transparent)]
-  Other(#[from] JsErrorBox),
+  ResolveNpmReqRef(#[from] deno_resolver::npm::ResolveNpmReqRefError),
+  #[class(inherit)]
+  #[error(transparent)]
+  ResolveReferrer(#[from] ResolveReferrerError),
 }
 
 impl<TGraphContainer: ModuleGraphContainer> CliModuleLoader<TGraphContainer> {
@@ -711,39 +688,10 @@ impl<TGraphContainer: ModuleGraphContainer>
     specifier: &ModuleSpecifier,
     maybe_referrer: Option<&ModuleSpecifier>,
     requested_module_type: &RequestedModuleType,
-  ) -> Result<ModuleCodeStringSource, LoadCodeSourceError> {
-    let graph = self.graph_container.graph();
-    let deno_resolver_requested_module_type =
-      as_deno_resolver_requested_module_type(requested_module_type);
-    match self
-      .shared
-      .prepared_module_loader
-      .load_prepared_module(
-        &graph,
-        specifier,
-        &deno_resolver_requested_module_type,
-      )
-      .await
-      .map_err(LoadCodeSourceError::from)?
-    {
-      Some(module_or_asset) => match module_or_asset {
-        LoadedModuleOrAsset::Module(prepared_module) => {
-          Ok(self.loaded_module_to_module_code_string_source(
-            prepared_module,
-            requested_module_type,
-          ))
-        }
-        LoadedModuleOrAsset::ExternalAsset { specifier } => {
-          self.load_asset(
-            specifier,
-            /* do not use dynamic import permissions because this was statically analyzable */ CheckSpecifierKind::Static,
-            requested_module_type
-          )
-          .await
-          .map_err(|err| LoadCodeSourceErrorKind::Fetch(err).into_box())
-        }
-      },
-      None => {
+  ) -> Result<ModuleCodeStringSource, CliModuleLoaderError> {
+    // this loader maintains npm specifiers in dynamic imports when resolving
+    // so that they can be properly preloaded, but now we might receive them
+    // here, so we need to actually resolve them to a file: specifier here
     let specifier = if let Ok(reference) =
       NpmPackageReqReference::from_specifier(specifier)
     {
@@ -753,11 +701,7 @@ impl<TGraphContainer: ModuleGraphContainer>
         Some(r) => Cow::Borrowed(r),
         // but the repl may also end up here and it won't have
         // a referrer so create a referrer for it here
-            None => Cow::Owned(
-              self
-                .resolve_referrer("")
-                .map_err(LoadCodeSourceError::from)?,
-            ),
+        None => Cow::Owned(self.resolve_referrer("")?),
       };
       Cow::Owned(
         self
@@ -768,47 +712,50 @@ impl<TGraphContainer: ModuleGraphContainer>
             &referrer,
             ResolutionMode::Import,
             NodeResolutionKind::Execution,
-              )
-              .map_err(LoadCodeSourceError::from)?
-              .unwrap()
-              .into_url()
-              .map_err(LoadCodeSourceError::from)?,
+          )?
+          .into_url()?,
       )
     } else {
       Cow::Borrowed(specifier)
     };
 
-        if self.shared.in_npm_pkg_checker.in_npm_package(&specifier) {
-          let loaded_module = self
+    let graph = self.graph_container.graph();
+    let deno_resolver_requested_module_type =
+      as_deno_resolver_requested_module_type(requested_module_type);
+    match self
       .shared
-            .npm_module_loader
+      .module_loader
       .load(
+        &graph,
         &specifier,
         maybe_referrer,
         &deno_resolver_requested_module_type,
       )
-            .await
-            .map_err(LoadCodeSourceError::from)?;
-          return Ok(self.loaded_module_to_module_code_string_source(
-            loaded_module,
+      .await?
+    {
+      LoadedModuleOrAsset::Module(prepared_module) => {
+        Ok(self.loaded_module_to_module_code_string_source(
+          prepared_module,
           requested_module_type,
-          ));
+        ))
       }
-
-        match requested_module_type {
-          RequestedModuleType::Text | RequestedModuleType::Bytes => self
+      LoadedModuleOrAsset::ExternalAsset {
+        specifier,
+        statically_analyzable,
+      } => {
+        self
           .load_asset(
             &specifier,
-              /* force using permissions because this was not statically analyzable */ CheckSpecifierKind::Dynamic,
-              requested_module_type
+            if statically_analyzable {
+              CheckSpecifierKind::Static
+            } else {
+              // force permissions
+              CheckSpecifierKind::Dynamic
+            },
+            requested_module_type,
           )
           .await
-            .map_err(LoadCodeSourceError::from),
-          _ => Err(LoadCodeSourceError::from(LoadUnpreparedModuleError {
-            specifier: specifier.into_owned(),
-            maybe_referrer: maybe_referrer.cloned(),
-          })),
-        }
+          .map_err(CliModuleLoaderError::Fetch)
       }
     }
   }
@@ -820,7 +767,7 @@ impl<TGraphContainer: ModuleGraphContainer>
   ) -> ModuleCodeStringSource {
     ModuleCodeStringSource {
       code: loaded_module_source_to_module_source_code(loaded_module.source),
-      found_url: loaded_module.specifier.clone(),
+      found_url: loaded_module.specifier.into_owned(),
       module_type: module_type_from_media_and_requested_type(
         loaded_module.media_type,
         requested_module_type,
@@ -976,7 +923,7 @@ impl<TGraphContainer: ModuleGraphContainer>
   fn resolve_referrer(
     &self,
     referrer: &str,
-  ) -> Result<ModuleSpecifier, ModuleLoaderError> {
+  ) -> Result<ModuleSpecifier, ResolveReferrerError> {
     let referrer = if referrer.is_empty() && self.shared.is_repl {
       // FIXME(bartlomieju): this is a hacky way to provide compatibility with REPL
       // and `Deno.core.evalContext` API. Ideally we should always have a referrer filled
@@ -985,19 +932,16 @@ impl<TGraphContainer: ModuleGraphContainer>
       referrer
     };
 
-    if deno_core::specifier_has_uri_scheme(referrer) {
-      deno_core::resolve_url(referrer).map_err(|e| e.into())
+    Ok(if deno_path_util::specifier_has_uri_scheme(referrer) {
+      deno_core::resolve_url(referrer)?
     } else if referrer == "." {
       // main module, use the initial cwd
-      deno_core::resolve_path(referrer, &self.shared.initial_cwd)
-        .map_err(|e| JsErrorBox::from_err(e).into())
+      deno_path_util::resolve_path(referrer, &self.shared.initial_cwd)?
     } else {
       // this cwd check is slow, so try to avoid it
-      let cwd = std::env::current_dir()
-        .map_err(|e| JsErrorBox::from_err(UnableToGetCwdError(e)))?;
-      deno_core::resolve_path(referrer, &cwd)
-        .map_err(|e| JsErrorBox::from_err(e).into())
-    }
+      let cwd = std::env::current_dir().map_err(UnableToGetCwdError)?;
+      deno_path_util::resolve_path(referrer, &cwd)?
+    })
   }
 
   #[allow(clippy::result_large_err)]
@@ -1024,7 +968,9 @@ impl<TGraphContainer: ModuleGraphContainer>
       Ok(())
     }
 
-    let referrer = self.resolve_referrer(raw_referrer)?;
+    let referrer = self
+      .resolve_referrer(raw_referrer)
+      .map_err(JsErrorBox::from_err)?;
     let graph = self.graph_container.graph();
     let result = self.shared.resolver.resolve_with_graph(
       graph.as_ref(),
@@ -1310,7 +1256,7 @@ impl<TGraphContainer: ModuleGraphContainer> ModuleLoader
     let source = self
       .0
       .shared
-      .prepared_module_loader
+      .module_loader
       .load_prepared_module_for_source_map_sync(&graph, &specifier)
       .ok()??;
     source_map_from_code(source.source.as_bytes()).map(Cow::Owned)

cli/rt/run.rs

@@ -408,7 +408,7 @@ impl ModuleLoader for EmbeddedModuleLoader {
           let code_source = shared
             .npm_module_loader
             .load(
-              &original_specifier,
+              Cow::Borrowed(&original_specifier),
               maybe_referrer.as_ref(),
               &as_deno_resolver_requested_module_type(&requested_module_type),
             )
@@ -416,7 +416,7 @@ impl ModuleLoader for EmbeddedModuleLoader {
             .map_err(JsErrorBox::from_err)?;
           let code_cache_entry = match requested_module_type {
             RequestedModuleType::None => shared.get_code_cache(
-              code_source.specifier,
+              &code_source.specifier,
               code_source.source.as_bytes(),
             ),
             RequestedModuleType::Other(_)
@@ -431,7 +431,7 @@ impl ModuleLoader for EmbeddedModuleLoader {
             ),
             loaded_module_source_to_module_source_code(code_source.source),
             &original_specifier,
-            code_source.specifier,
+            &code_source.specifier,
             code_cache_entry,
           ))
         }

cli/tools/bundle/mod.rs

@@ -28,7 +28,9 @@ use deno_graph::ModuleErrorKind;
 use deno_graph::Position;
 use deno_resolver::graph::ResolveWithGraphError;
 use deno_resolver::graph::ResolveWithGraphOptions;
-use deno_resolver::loader::LoadPreparedModuleError;
+use deno_resolver::loader::LoadCodeSourceError;
+use deno_resolver::loader::LoadCodeSourceErrorKind;
+use deno_resolver::loader::LoadPreparedModuleErrorKind;
 use deno_resolver::npm::managed::ResolvePkgFolderFromDenoModuleError;
 use deno_runtime::deno_permissions::PermissionsContainer;
 use deno_semver::npm::NpmPackageReqReference;
@@ -55,8 +57,6 @@ use crate::graph_container::ModuleGraphContainer;
 use crate::graph_container::ModuleGraphUpdatePermit;
 use crate::module_loader::CliModuleLoader;
 use crate::module_loader::CliModuleLoaderError;
-use crate::module_loader::LoadCodeSourceError;
-use crate::module_loader::LoadCodeSourceErrorKind;
 use crate::module_loader::ModuleLoadPreparer;
 use crate::module_loader::PrepareModuleLoadOptions;
 use crate::node::CliNodeResolver;
@@ -669,15 +669,16 @@ impl BundleLoadError {
       BundleLoadError::CliModuleLoader(
         CliModuleLoaderError::LoadCodeSource(LoadCodeSourceError(e)),
       ) => match &**e {
-        LoadCodeSourceErrorKind::LoadPreparedModule(
-          LoadPreparedModuleError::Graph(e),
-        ) => matches!(
+        LoadCodeSourceErrorKind::LoadPreparedModule(e) => match e.as_kind() {
+          LoadPreparedModuleErrorKind::Graph(e) => matches!(
             e.error.as_kind(),
             ModuleErrorKind::UnsupportedMediaType { .. },
           ),
           _ => false,
         },
         _ => false,
+      },
+      _ => false,
     }
   }
 }

libs/npm_installer/graph.rs

@@ -125,9 +125,8 @@ impl<TNpmCacheHttpClient: NpmCacheHttpClient, TSys: NpmInstallerSys>
         }
       }
       None => {
-        let err = Arc::new(JsErrorBox::generic(
-          "npm specifiers were requested; but --no-npm is specified",
-        ));
+        let err =
+          Arc::new(JsErrorBox::from_err(deno_resolver::npm::NoNpmError));
         NpmResolvePkgReqsResult {
           results: package_reqs
             .iter()

libs/resolver/factory.rs

@@ -719,9 +719,7 @@ pub struct ResolverFactory<TSys: WorkspaceFactorySys> {
   parsed_source_cache: crate::cache::ParsedSourceCacheRc,
   pkg_json_resolver: Deferred<PackageJsonResolverRc<TSys>>,
   #[cfg(all(feature = "graph", feature = "deno_ast"))]
-  prepared_module_loader: Deferred<
-    crate::loader::PreparedModuleLoaderRc<DenoInNpmPackageChecker, TSys>,
-  >,
+  module_loader: Deferred<crate::loader::ModuleLoaderRc<TSys>>,
   raw_deno_resolver: async_once_cell::OnceCell<DefaultRawDenoResolverRc<TSys>>,
   workspace_factory: WorkspaceFactoryRc<TSys>,
   workspace_resolver: async_once_cell::OnceCell<WorkspaceResolverRc<TSys>>,
@@ -758,7 +756,7 @@ impl<TSys: WorkspaceFactorySys> ResolverFactory<TSys> {
       parsed_source_cache: Default::default(),
       pkg_json_resolver: Default::default(),
       #[cfg(all(feature = "graph", feature = "deno_ast"))]
-      prepared_module_loader: Default::default(),
+      module_loader: Default::default(),
       workspace_factory,
       workspace_resolver: Default::default(),
       options,
@@ -1041,18 +1039,17 @@ impl<TSys: WorkspaceFactorySys> ResolverFactory<TSys> {
   }
 
   #[cfg(all(feature = "graph", feature = "deno_ast"))]
-  pub fn prepared_module_loader(
+  pub fn module_loader(
     &self,
-  ) -> Result<
-    &crate::loader::PreparedModuleLoaderRc<DenoInNpmPackageChecker, TSys>,
-    anyhow::Error,
-  > {
-    self.prepared_module_loader.get_or_try_init(|| {
+  ) -> Result<&crate::loader::ModuleLoaderRc<TSys>, anyhow::Error> {
+    self.module_loader.get_or_try_init(|| {
       let cjs_tracker = self.cjs_tracker()?;
-      Ok(new_rc(crate::loader::PreparedModuleLoader::new(
+      Ok(new_rc(crate::loader::ModuleLoader::new(
         cjs_tracker.clone(),
         self.emitter()?.clone(),
+        self.in_npm_package_checker()?.clone(),
         self.node_code_translator()?.clone(),
+        self.npm_module_loader()?.clone(),
         self.parsed_source_cache.clone(),
         self.workspace_factory.sys.clone(),
       )))

libs/resolver/graph.rs

@@ -302,18 +302,14 @@ impl<
         } else {
           match NpmPackageReqReference::from_specifier(&specifier) {
             Ok(reference) => {
-              if let Some(url) =
+              let url =
                 self.resolver.resolve_non_workspace_npm_req_ref_to_file(
                   &reference,
                   referrer,
                   options.mode,
                   options.kind,
-                )?
-              {
+                )?;
               url.into_url()?
-              } else {
-                specifier.into_owned()
-              }
             }
             _ => specifier.into_owned(),
           }
@@ -329,7 +325,7 @@ impl<
     referrer: &Url,
     resolution_mode: node_resolver::ResolutionMode,
     resolution_kind: node_resolver::NodeResolutionKind,
-  ) -> Result<Option<node_resolver::UrlOrPath>, npm::ResolveNpmReqRefError> {
+  ) -> Result<node_resolver::UrlOrPath, npm::ResolveNpmReqRefError> {
     self.resolver.resolve_non_workspace_npm_req_ref_to_file(
       npm_req_ref,
       referrer,

libs/resolver/lib.rs

@@ -633,20 +633,22 @@ impl<
     referrer: &Url,
     resolution_mode: ResolutionMode,
     resolution_kind: NodeResolutionKind,
-  ) -> Result<Option<node_resolver::UrlOrPath>, npm::ResolveNpmReqRefError> {
+  ) -> Result<node_resolver::UrlOrPath, npm::ResolveNpmReqRefError> {
     let Some(NodeAndNpmResolvers {
       npm_req_resolver, ..
     }) = &self.node_and_npm_resolver
     else {
-      return Ok(None);
+      return Err(npm::ResolveNpmReqRefError {
+        npm_req_ref: npm_req_ref.clone(),
+        err: npm::ResolveReqWithSubPathErrorKind::NoNpm(npm::NoNpmError)
+          .into_box(),
+      });
     };
-    npm_req_resolver
-      .resolve_req_reference(
+    npm_req_resolver.resolve_req_reference(
       npm_req_ref,
       referrer,
       resolution_mode,
       resolution_kind,
     )
-      .map(Some)
   }
 }

libs/resolver/loader/mod.rs

@@ -3,14 +3,14 @@
 mod npm;
 
 #[cfg(all(feature = "graph", feature = "deno_ast"))]
-mod prepared;
+mod module_loader;
 
 use std::borrow::Cow;
 
 use deno_media_type::MediaType;
-pub use npm::*;
 #[cfg(all(feature = "graph", feature = "deno_ast"))]
-pub use prepared::*;
+pub use module_loader::*;
+pub use npm::*;
 use url::Url;
 
 pub enum RequestedModuleType<'a> {
@@ -26,8 +26,18 @@ type ArcStr = std::sync::Arc<str>;
 #[allow(clippy::disallowed_types)]
 type ArcBytes = std::sync::Arc<[u8]>;
 
+pub enum LoadedModuleOrAsset<'a> {
+  Module(LoadedModule<'a>),
+  /// An external asset that the caller must fetch.
+  ExternalAsset {
+    specifier: Cow<'a, Url>,
+    /// Whether this was a module the graph knows about.
+    statically_analyzable: bool,
+  },
+}
+
 pub struct LoadedModule<'a> {
-  pub specifier: &'a Url,
+  pub specifier: Cow<'a, Url>,
   pub media_type: MediaType,
   pub source: LoadedModuleSource,
 }

libs/resolver/loader/module_loader.rs

@@ -2,32 +2,31 @@
 
 use std::borrow::Cow;
 
-use deno_ast::MediaType;
+use boxed_error::Boxed;
 use deno_ast::ModuleKind;
-use deno_error::JsError;
 use deno_graph::JsModule;
 use deno_graph::JsonModule;
 use deno_graph::ModuleGraph;
 use deno_graph::WasmModule;
+use deno_media_type::MediaType;
 use node_resolver::InNpmPackageChecker;
-use node_resolver::analyze::NodeCodeTranslatorSys;
 use node_resolver::errors::ClosestPkgJsonError;
-use thiserror::Error;
 use url::Url;
 
+use super::DenoNpmModuleLoaderRc;
 use super::LoadedModule;
+use super::LoadedModuleOrAsset;
 use super::LoadedModuleSource;
+use super::NpmModuleLoadError;
 use super::RequestedModuleType;
 use crate::cache::ParsedSourceCacheRc;
 use crate::cjs::CjsTrackerRc;
-use crate::cjs::analyzer::DenoCjsCodeAnalyzerSys;
 use crate::emit::EmitParsedSourceHelperError;
 use crate::emit::EmitterRc;
-use crate::emit::EmitterSys;
 use crate::factory::DenoNodeCodeTranslatorRc;
 use crate::graph::EnhanceGraphErrorMode;
 use crate::graph::enhance_graph_error;
-use crate::npm::NpmResolverSys;
+use crate::npm::DenoInNpmPackageChecker;
 
 #[allow(clippy::disallowed_types)]
 type ArcStr = std::sync::Arc<str>;
@@ -41,8 +40,12 @@ pub struct EnhancedGraphError {
   pub message: String,
 }
 
-#[derive(Debug, Error, JsError)]
-pub enum LoadPreparedModuleError {
+#[derive(Debug, deno_error::JsError, Boxed)]
+#[class(inherit)]
+pub struct LoadPreparedModuleError(pub Box<LoadPreparedModuleErrorKind>);
+
+#[derive(Debug, thiserror::Error, deno_error::JsError)]
+pub enum LoadPreparedModuleErrorKind {
   #[class(inherit)]
   #[error(transparent)]
   Graph(#[from] EnhancedGraphError),
@@ -67,24 +70,45 @@ pub enum LoadMaybeCjsError {
   TranslateCjsToEsm(#[from] node_resolver::analyze::TranslateCjsToEsmError),
 }
 
-#[allow(clippy::disallowed_types)]
-pub type PreparedModuleLoaderRc<TInNpmPackageChecker, TSys> =
-  crate::sync::MaybeArc<PreparedModuleLoader<TInNpmPackageChecker, TSys>>;
+#[derive(Debug, deno_error::JsError, Boxed)]
+#[class(inherit)]
+pub struct LoadCodeSourceError(pub Box<LoadCodeSourceErrorKind>);
 
-#[sys_traits::auto_impl]
-pub trait PreparedModuleLoaderSys:
-  EmitterSys + NodeCodeTranslatorSys + DenoCjsCodeAnalyzerSys + NpmResolverSys
-{
+#[derive(Debug, thiserror::Error, deno_error::JsError)]
+pub enum LoadCodeSourceErrorKind {
+  #[class(inherit)]
+  #[error(transparent)]
+  LoadPreparedModule(#[from] LoadPreparedModuleError),
+  #[class(inherit)]
+  #[error(transparent)]
+  NpmModuleLoad(#[from] NpmModuleLoadError),
+  #[class(inherit)]
+  #[error(transparent)]
+  PathToUrl(#[from] deno_path_util::PathToUrlError),
+  #[class(inherit)]
+  #[error(transparent)]
+  LoadUnpreparedModule(#[from] LoadUnpreparedModuleError),
 }
 
-pub enum LoadedModuleOrAsset<'graph> {
-  Module(LoadedModule<'graph>),
-  /// A module that the graph knows about, but the data
-  /// is not stored in the graph itself. It's up to the caller
-  /// to fetch this data.
-  ExternalAsset {
-    specifier: &'graph Url,
-  },
+#[derive(Debug, thiserror::Error, deno_error::JsError)]
+#[class(generic)]
+#[error("Loading unprepared module: {}{}", .specifier, .maybe_referrer.as_ref().map(|r| format!(", imported from: {}", r)).unwrap_or_default())]
+pub struct LoadUnpreparedModuleError {
+  specifier: Url,
+  maybe_referrer: Option<Url>,
+}
+
+#[allow(clippy::disallowed_types)]
+pub type ModuleLoaderRc<TSys> = crate::sync::MaybeArc<ModuleLoader<TSys>>;
+
+#[sys_traits::auto_impl]
+pub trait ModuleLoaderSys:
+  super::NpmModuleLoaderSys
+  + crate::emit::EmitterSys
+  + node_resolver::analyze::NodeCodeTranslatorSys
+  + crate::cjs::analyzer::DenoCjsCodeAnalyzerSys
+  + crate::npm::NpmResolverSys
+{
 }
 
 enum CodeOrDeferredEmit<'a> {
@@ -104,36 +128,106 @@ enum CodeOrDeferredEmit<'a> {
   },
 }
 
-pub struct PreparedModuleLoader<
-  TInNpmPackageChecker: InNpmPackageChecker,
-  TSys: PreparedModuleLoaderSys,
-> {
-  cjs_tracker: CjsTrackerRc<TInNpmPackageChecker, TSys>,
-  emitter: EmitterRc<TInNpmPackageChecker, TSys>,
-  node_code_translator: DenoNodeCodeTranslatorRc<TSys>,
-  parsed_source_cache: ParsedSourceCacheRc,
-  sys: TSys,
+pub struct ModuleLoader<TSys: ModuleLoaderSys> {
+  in_npm_pkg_checker: DenoInNpmPackageChecker,
+  npm_module_loader: DenoNpmModuleLoaderRc<TSys>,
+  prepared_module_loader: PreparedModuleLoader<TSys>,
 }
 
-impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
-  PreparedModuleLoader<TInNpmPackageChecker, TSys>
-{
+impl<TSys: ModuleLoaderSys> ModuleLoader<TSys> {
+  #[allow(clippy::too_many_arguments)]
   pub fn new(
-    cjs_tracker: CjsTrackerRc<TInNpmPackageChecker, TSys>,
-    emitter: EmitterRc<TInNpmPackageChecker, TSys>,
+    cjs_tracker: CjsTrackerRc<DenoInNpmPackageChecker, TSys>,
+    emitter: EmitterRc<DenoInNpmPackageChecker, TSys>,
+    in_npm_pkg_checker: DenoInNpmPackageChecker,
     node_code_translator: DenoNodeCodeTranslatorRc<TSys>,
+    npm_module_loader: DenoNpmModuleLoaderRc<TSys>,
     parsed_source_cache: ParsedSourceCacheRc,
     sys: TSys,
   ) -> Self {
     Self {
+      in_npm_pkg_checker,
+      npm_module_loader,
+      prepared_module_loader: PreparedModuleLoader {
         cjs_tracker,
         emitter,
         node_code_translator,
         parsed_source_cache,
         sys,
+      },
     }
   }
 
+  /// Loads a module using the graph or file system.
+  ///
+  /// Note that the referrer is only used to enhance error messages and
+  /// doesn't need to be provided.
+  pub async fn load<'a>(
+    &self,
+    graph: &'a ModuleGraph,
+    specifier: &'a Url,
+    // todo(#30074): we should remove passing the referrer in here and remove the
+    // referrer from all error messages. This should be up to deno_core to display.
+    maybe_referrer: Option<&Url>,
+    requested_module_type: &RequestedModuleType<'_>,
+  ) -> Result<LoadedModuleOrAsset<'a>, LoadCodeSourceError> {
+    match self
+      .prepared_module_loader
+      .load_prepared_module(graph, specifier, requested_module_type)
+      .await
+      .map_err(LoadCodeSourceError::from)?
+    {
+      Some(module_or_asset) => Ok(module_or_asset),
+      None => {
+        if self.in_npm_pkg_checker.in_npm_package(specifier) {
+          let loaded_module = self
+            .npm_module_loader
+            .load(
+              Cow::Borrowed(specifier),
+              maybe_referrer,
+              requested_module_type,
+            )
+            .await
+            .map_err(LoadCodeSourceError::from)?;
+          return Ok(LoadedModuleOrAsset::Module(loaded_module));
+        }
+
+        match requested_module_type {
+          RequestedModuleType::Text | RequestedModuleType::Bytes => {
+            Ok(LoadedModuleOrAsset::ExternalAsset {
+              specifier: Cow::Borrowed(specifier),
+              statically_analyzable: false,
+            })
+          }
+          _ => Err(LoadCodeSourceError::from(LoadUnpreparedModuleError {
+            specifier: specifier.clone(),
+            maybe_referrer: maybe_referrer.cloned(),
+          })),
+        }
+      }
+    }
+  }
+
+  pub fn load_prepared_module_for_source_map_sync<'graph>(
+    &self,
+    graph: &'graph ModuleGraph,
+    specifier: &Url,
+  ) -> Result<Option<LoadedModule<'graph>>, anyhow::Error> {
+    self
+      .prepared_module_loader
+      .load_prepared_module_for_source_map_sync(graph, specifier)
+  }
+}
+
+struct PreparedModuleLoader<TSys: ModuleLoaderSys> {
+  cjs_tracker: CjsTrackerRc<DenoInNpmPackageChecker, TSys>,
+  emitter: EmitterRc<DenoInNpmPackageChecker, TSys>,
+  node_code_translator: DenoNodeCodeTranslatorRc<TSys>,
+  parsed_source_cache: ParsedSourceCacheRc,
+  sys: TSys,
+}
+
+impl<TSys: ModuleLoaderSys> PreparedModuleLoader<TSys> {
   pub async fn load_prepared_module<'graph>(
     &self,
     graph: &'graph ModuleGraph,
@@ -165,7 +259,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         Ok(Some(LoadedModuleOrAsset::Module(LoadedModule {
           // note: it's faster to provide a string to v8 if we know it's a string
           source: LoadedModuleSource::ArcStr(transpile_result),
-          specifier,
+          specifier: Cow::Borrowed(specifier),
           media_type,
         })))
       }
@@ -178,14 +272,18 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         .await
         .map(|text| {
           Some(LoadedModuleOrAsset::Module(LoadedModule {
-            specifier,
+            specifier: Cow::Borrowed(specifier),
             media_type,
             source: LoadedModuleSource::ArcStr(text),
           }))
         })
-        .map_err(LoadPreparedModuleError::LoadMaybeCjs),
+        .map_err(|e| LoadPreparedModuleErrorKind::LoadMaybeCjs(e).into_box()),
       Some(CodeOrDeferredEmit::ExternalAsset { specifier }) => {
-        Ok(Some(LoadedModuleOrAsset::ExternalAsset { specifier }))
+        Ok(Some(LoadedModuleOrAsset::ExternalAsset {
+          specifier: Cow::Borrowed(specifier),
+          // came from graph, so yes
+          statically_analyzable: true,
+        }))
       }
       None => Ok(None),
     }
@@ -221,7 +319,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         Ok(Some(LoadedModule {
           // note: it's faster to provide a string if we know it's a string
           source: LoadedModuleSource::ArcStr(transpile_result),
-          specifier,
+          specifier: Cow::Borrowed(specifier),
           media_type,
         }))
       }
@@ -263,7 +361,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         RequestedModuleType::Bytes => match source.try_get_original_bytes() {
           Some(bytes) => Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
             source: LoadedModuleSource::ArcBytes(bytes),
-            specifier,
+            specifier: Cow::Borrowed(specifier),
             media_type: *media_type,
           }))),
           None => Ok(Some(CodeOrDeferredEmit::ExternalAsset { specifier })),
@@ -271,13 +369,13 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         RequestedModuleType::Text => {
           Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
             source: LoadedModuleSource::ArcStr(source.text.clone()),
-            specifier,
+            specifier: Cow::Borrowed(specifier),
             media_type: *media_type,
           })))
         }
         _ => Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
           source: LoadedModuleSource::ArcStr(source.text.clone()),
-          specifier,
+          specifier: Cow::Borrowed(specifier),
           media_type: *media_type,
         }))),
       },
@@ -291,7 +389,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         RequestedModuleType::Bytes => match source.try_get_original_bytes() {
           Some(bytes) => Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
             source: LoadedModuleSource::ArcBytes(bytes),
-            specifier,
+            specifier: Cow::Borrowed(specifier),
             media_type: *media_type,
           }))),
           None => Ok(Some(CodeOrDeferredEmit::ExternalAsset { specifier })),
@@ -299,7 +397,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         RequestedModuleType::Text => {
           Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
             source: LoadedModuleSource::ArcStr(source.text.clone()),
-            specifier,
+            specifier: Cow::Borrowed(specifier),
             media_type: *media_type,
           })))
         }
@@ -354,7 +452,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
 
           Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
             source: LoadedModuleSource::ArcStr(code),
-            specifier,
+            specifier: Cow::Borrowed(specifier),
             media_type: *media_type,
           })))
         }
@@ -363,7 +461,7 @@ impl<TInNpmPackageChecker: InNpmPackageChecker, TSys: PreparedModuleLoaderSys>
         source, specifier, ..
       })) => Ok(Some(CodeOrDeferredEmit::Source(LoadedModule {
         source: LoadedModuleSource::ArcBytes(source.clone()),
-        specifier,
+        specifier: Cow::Borrowed(specifier),
         media_type: MediaType::Wasm,
       }))),
       Some(deno_graph::Module::External(module))

libs/resolver/loader/npm.rs

@@ -82,12 +82,12 @@ fn format_dir_import_message(
   if let Some(referrer) = maybe_referrer {
     msg.push_str(" is not supported resolving import from ");
     msg.push_str(referrer.as_str());
+  }
   if let Some(entrypoint_name) = suggestion {
     msg.push_str("\nDid you mean to import ");
     msg.push_str(entrypoint_name);
     msg.push_str(" within the directory?");
   }
-  }
   msg
 }
 
@@ -160,11 +160,11 @@ impl<
 
   pub async fn load<'a>(
     &self,
-    specifier: &'a Url,
+    specifier: Cow<'a, Url>,
     maybe_referrer: Option<&Url>,
     requested_module_type: &RequestedModuleType<'_>,
   ) -> Result<LoadedModule<'a>, NpmModuleLoadError> {
-    let file_path = deno_path_util::url_to_file_path(specifier)?;
+    let file_path = deno_path_util::url_to_file_path(&specifier)?;
     let code = self.sys.fs_read(&file_path).map_err(|source| {
       if self.sys.fs_is_dir_no_err(&file_path) {
         let suggestion = ["index.mjs", "index.js", "index.cjs"]
@@ -185,7 +185,7 @@ impl<
       }
     })?;
 
-    let media_type = MediaType::from_specifier(specifier);
+    let media_type = MediaType::from_specifier(&specifier);
     match requested_module_type {
       RequestedModuleType::Text | RequestedModuleType::Bytes => {
         Ok(LoadedModule {
@@ -200,18 +200,18 @@ impl<
         if media_type.is_emittable() {
           return Err(NpmModuleLoadError::StrippingTypesNodeModules(
             StrippingTypesNodeModulesError {
-              specifier: specifier.clone(),
+              specifier: specifier.into_owned(),
             },
           ));
         }
 
-        let source = if self.cjs_tracker.is_maybe_cjs(specifier, media_type)? {
+        let source = if self.cjs_tracker.is_maybe_cjs(&specifier, media_type)? {
           // translate cjs to esm if it's cjs and inject node globals
           let code = from_utf8_lossy_cow(code);
           LoadedModuleSource::String(
             self
               .node_code_translator
-              .translate_cjs_to_esm(specifier, Some(code))
+              .translate_cjs_to_esm(&specifier, Some(code))
               .await?
               .into_owned()
               .into(),

libs/resolver/npm/mod.rs

@@ -125,6 +125,11 @@ pub enum ResolveIfForNpmPackageErrorKind {
   NodeModulesOutOfDate(#[from] NodeModulesOutOfDateError),
 }
 
+#[derive(Debug, Error, JsError)]
+#[error("npm specifiers were requested; but --no-npm is specified")]
+#[class("generic")]
+pub struct NoNpmError;
+
 #[derive(Debug, JsError)]
 #[class(inherit)]
 pub struct ResolveNpmReqRefError {
@@ -151,6 +156,7 @@ pub struct ResolveReqWithSubPathError(pub Box<ResolveReqWithSubPathErrorKind>);
 impl ResolveReqWithSubPathError {
   pub fn maybe_specifier(&self) -> Option<Cow<UrlOrPath>> {
     match self.as_kind() {
+      ResolveReqWithSubPathErrorKind::NoNpm(_) => None,
       ResolveReqWithSubPathErrorKind::MissingPackageNodeModulesFolder(err) => {
         err.inner.maybe_specifier()
       }
@@ -171,6 +177,9 @@ pub enum ResolveReqWithSubPathErrorKind {
   MissingPackageNodeModulesFolder(#[from] MissingPackageNodeModulesFolderError),
   #[class(inherit)]
   #[error(transparent)]
+  NoNpm(NoNpmError),
+  #[class(inherit)]
+  #[error(transparent)]
   ResolvePkgFolderFromDenoReq(
     #[from] ContextedResolvePkgFolderFromDenoReqError,
   ),
@@ -182,6 +191,7 @@ pub enum ResolveReqWithSubPathErrorKind {
 impl ResolveReqWithSubPathErrorKind {
   pub fn as_types_not_found(&self) -> Option<&TypesNotFoundError> {
     match self {
+      ResolveReqWithSubPathErrorKind::NoNpm(_) => None,
       ResolveReqWithSubPathErrorKind::MissingPackageNodeModulesFolder(_)
       | ResolveReqWithSubPathErrorKind::ResolvePkgFolderFromDenoReq(_) => None,
       ResolveReqWithSubPathErrorKind::PackageSubpathResolve(
@@ -192,6 +202,7 @@ impl ResolveReqWithSubPathErrorKind {
 
   pub fn maybe_code(&self) -> Option<NodeJsErrorCode> {
     match self {
+      ResolveReqWithSubPathErrorKind::NoNpm(_) => None,
       ResolveReqWithSubPathErrorKind::MissingPackageNodeModulesFolder(_) => {
         None
       }

libs/resolver/workspace.rs

@@ -856,8 +856,6 @@ pub enum ResolutionKind {
   Execution,
   /// Resolving for code that will be used for type information.
   Types,
-  /// Resolving for code that will be bundled.
-  Bundling,
 }
 
 impl ResolutionKind {