feat(unstable/lsp): support navigating to deno_modules folder (#20030)

Closes #20015
Closes https://github.com/denoland/vscode_deno/issues/850 (only for
deno_modules, but I don't think this will be possible for the global
cache)

cli/cache/http_cache/local.rs

@@ -11,12 +11,9 @@ use std::time::SystemTime;
 use deno_ast::MediaType;
 use deno_core::error::AnyError;
 use deno_core::parking_lot::RwLock;
-use deno_core::serde_json;
 use deno_core::url::Url;
 use indexmap::IndexMap;
 use once_cell::sync::Lazy;
-use serde::Deserialize;
-use serde::Serialize;
 
 use crate::cache::CACHE_PERM;
 use crate::http_util::HeadersMap;
@@ -31,6 +28,129 @@ use super::CachedUrlMetadata;
 use super::HttpCache;
 use super::HttpCacheItemKey;
 
+/// A deno_modules http cache for the lsp that provides functionality
+/// for doing a reverse mapping.
+#[derive(Debug)]
+pub struct LocalLspHttpCache {
+  cache: LocalHttpCache,
+}
+
+impl LocalLspHttpCache {
+  pub fn new(path: PathBuf, global_cache: Arc<GlobalHttpCache>) -> Self {
+    assert!(path.is_absolute());
+    let manifest = LocalCacheManifest::new_for_lsp(path.join("manifest.json"));
+    Self {
+      cache: LocalHttpCache {
+        path,
+        manifest,
+        global_cache,
+      },
+    }
+  }
+
+  pub fn get_file_url(&self, url: &Url) -> Option<Url> {
+    {
+      let data = self.cache.manifest.data.read();
+      if let Some(data) = data.get(url) {
+        if let Some(path) = &data.path {
+          return Url::from_file_path(self.cache.path.join(path)).ok();
+        }
+      }
+    }
+    match self.cache.get_cache_filepath(url, &Default::default()) {
+      Ok(path) if path.exists() => Url::from_file_path(path).ok(),
+      _ => None,
+    }
+  }
+
+  pub fn get_remote_url(&self, path: &Path) -> Option<Url> {
+    let Ok(path) = path.strip_prefix(&self.cache.path) else {
+      return None; // not in this directory
+    };
+    let has_hashed_component = path
+      .components()
+      .any(|p| p.as_os_str().to_string_lossy().starts_with('#'));
+    if has_hashed_component {
+      // check in the manifest
+      {
+        let data = self.cache.manifest.data.read();
+        if let Some(url) = data.get_reverse_mapping(path) {
+          return Some(url);
+        }
+      }
+      None
+    } else {
+      // we can work backwards from the path to the url
+      let mut parts = Vec::new();
+      for (i, part) in path.components().enumerate() {
+        let part = part.as_os_str().to_string_lossy();
+        if i == 0 {
+          let mut result = String::new();
+          let part = if let Some(part) = part.strip_prefix("http_") {
+            result.push_str("http://");
+            part
+          } else {
+            result.push_str("https://");
+            &part
+          };
+          if let Some((domain, port)) = part.rsplit_once('_') {
+            result.push_str(&format!("{}:{}", domain, port));
+          } else {
+            result.push_str(part);
+          }
+          parts.push(result);
+        } else {
+          parts.push(part.to_string());
+        }
+      }
+      Url::parse(&parts.join("/")).ok()
+    }
+  }
+}
+
+impl HttpCache for LocalLspHttpCache {
+  fn cache_item_key<'a>(
+    &self,
+    url: &'a Url,
+  ) -> Result<HttpCacheItemKey<'a>, AnyError> {
+    self.cache.cache_item_key(url)
+  }
+
+  fn contains(&self, url: &Url) -> bool {
+    self.cache.contains(url)
+  }
+
+  fn set(
+    &self,
+    url: &Url,
+    headers: HeadersMap,
+    content: &[u8],
+  ) -> Result<(), AnyError> {
+    self.cache.set(url, headers, content)
+  }
+
+  fn read_modified_time(
+    &self,
+    key: &HttpCacheItemKey,
+  ) -> Result<Option<SystemTime>, AnyError> {
+    self.cache.read_modified_time(key)
+  }
+
+  fn read_file_bytes(
+    &self,
+    key: &HttpCacheItemKey,
+  ) -> Result<Option<Vec<u8>>, AnyError> {
+    self.cache.read_file_bytes(key)
+  }
+
+  fn read_metadata(
+    &self,
+    key: &HttpCacheItemKey,
+  ) -> Result<Option<CachedUrlMetadata>, AnyError> {
+    self.cache.read_metadata(key)
+  }
+}
+
 #[derive(Debug)]
 pub struct LocalHttpCache {
   path: PathBuf,
@@ -181,7 +301,7 @@ impl HttpCache for LocalHttpCache {
   }
 }
 
-struct LocalCacheSubPath {
+pub(super) struct LocalCacheSubPath {
   pub has_hash: bool,
   pub parts: Vec<String>,
 }
@@ -194,6 +314,14 @@ impl LocalCacheSubPath {
     }
     path
   }
+
+  pub fn as_relative_path(&self) -> PathBuf {
+    let mut path = PathBuf::with_capacity(self.parts.len());
+    for part in &self.parts {
+      path.push(part);
+    }
+    path
+  }
 }
 
 fn url_to_local_sub_path(
@@ -335,48 +463,28 @@ fn url_to_local_sub_path(
   Ok(LocalCacheSubPath { has_hash, parts })
 }
 
-#[derive(Debug, Default, Clone)]
-struct LocalCacheManifestData {
-  serialized: SerializedLocalCacheManifestData,
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
-struct SerializedLocalCacheManifestDataModule {
-  #[serde(skip_serializing_if = "Option::is_none")]
-  pub path: Option<String>,
-  #[serde(
-    default = "IndexMap::new",
-    skip_serializing_if = "IndexMap::is_empty"
-  )]
-  pub headers: IndexMap<String, String>,
-}
-
-#[derive(Debug, Default, Clone, Serialize, Deserialize)]
-struct SerializedLocalCacheManifestData {
-  pub modules: IndexMap<Url, SerializedLocalCacheManifestDataModule>,
-}
-
 #[derive(Debug)]
 struct LocalCacheManifest {
   file_path: PathBuf,
-  data: RwLock<LocalCacheManifestData>,
+  data: RwLock<manifest::LocalCacheManifestData>,
 }
 
 impl LocalCacheManifest {
   pub fn new(file_path: PathBuf) -> Self {
-    let serialized: SerializedLocalCacheManifestData =
-      std::fs::read(&file_path)
-        .ok()
-        .and_then(|data| match serde_json::from_slice(&data) {
-          Ok(data) => Some(data),
-          Err(err) => {
-            log::debug!("Failed deserializing local cache manifest: {:#}", err);
-            None
+    Self::new_internal(file_path, false)
   }
-        })
-        .unwrap_or_default();
+
+  pub fn new_for_lsp(file_path: PathBuf) -> Self {
+    Self::new_internal(file_path, true)
+  }
+
+  fn new_internal(file_path: PathBuf, use_reverse_mapping: bool) -> Self {
+    let text = std::fs::read_to_string(&file_path).ok();
     Self {
-      data: RwLock::new(LocalCacheManifestData { serialized }),
+      data: RwLock::new(manifest::LocalCacheManifestData::new(
+        text.as_deref(),
+        use_reverse_mapping,
+      )),
       file_path,
     }
   }
@@ -419,9 +527,9 @@ impl LocalCacheManifest {
     let mut data = self.data.write();
     let is_empty = headers_subset.is_empty() && !sub_path.has_hash;
     let has_changed = if is_empty {
-      data.serialized.modules.remove(&url).is_some()
+      data.remove(&url, &sub_path)
     } else {
-      let new_data = SerializedLocalCacheManifestDataModule {
+      let new_data = manifest::SerializedLocalCacheManifestDataModule {
         path: if headers_subset.contains_key("location") {
           None
         } else {
@@ -429,10 +537,10 @@ impl LocalCacheManifest {
         },
         headers: headers_subset,
       };
-      if data.serialized.modules.get(&url) == Some(&new_data) {
+      if data.get(&url) == Some(&new_data) {
         false
       } else {
-        data.serialized.modules.insert(url.clone(), new_data);
+        data.insert(url.clone(), &sub_path, new_data);
         true
       }
     };
@@ -440,11 +548,8 @@ impl LocalCacheManifest {
     if has_changed {
       // don't bother ensuring the directory here because it will
       // eventually be created by files being added to the cache
-      let result = atomic_write_file(
-        &self.file_path,
-        serde_json::to_string_pretty(&data.serialized).unwrap(),
-        CACHE_PERM,
-      );
+      let result =
+        atomic_write_file(&self.file_path, data.as_json(), CACHE_PERM);
       if let Err(err) = result {
         log::debug!("Failed saving local cache manifest: {:#}", err);
       }
@@ -453,7 +558,7 @@ impl LocalCacheManifest {
 
   pub fn get_metadata(&self, url: &Url) -> Option<CachedUrlMetadata> {
     let data = self.data.read();
-    match data.serialized.modules.get(url) {
+    match data.get(url) {
       Some(module) => {
         let headers = module
           .headers
@@ -500,6 +605,126 @@ impl LocalCacheManifest {
   }
 }
 
+// This is in a separate module in order to enforce keeping
+// the internal implementation private.
+mod manifest {
+  use std::collections::HashMap;
+  use std::path::Path;
+  use std::path::PathBuf;
+
+  use deno_core::serde_json;
+  use deno_core::url::Url;
+  use indexmap::IndexMap;
+  use serde::Deserialize;
+  use serde::Serialize;
+
+  use super::LocalCacheSubPath;
+
+  #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+  pub struct SerializedLocalCacheManifestDataModule {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub path: Option<String>,
+    #[serde(
+      default = "IndexMap::new",
+      skip_serializing_if = "IndexMap::is_empty"
+    )]
+    pub headers: IndexMap<String, String>,
+  }
+
+  #[derive(Debug, Default, Clone, Serialize, Deserialize)]
+  struct SerializedLocalCacheManifestData {
+    pub modules: IndexMap<Url, SerializedLocalCacheManifestDataModule>,
+  }
+
+  #[derive(Debug, Default, Clone)]
+  pub(super) struct LocalCacheManifestData {
+    serialized: SerializedLocalCacheManifestData,
+    // reverse mapping used in the lsp
+    reverse_mapping: Option<HashMap<PathBuf, Url>>,
+  }
+
+  impl LocalCacheManifestData {
+    pub fn new(maybe_text: Option<&str>, use_reverse_mapping: bool) -> Self {
+      let serialized: SerializedLocalCacheManifestData = maybe_text
+        .and_then(|text| match serde_json::from_str(text) {
+          Ok(data) => Some(data),
+          Err(err) => {
+            log::debug!("Failed deserializing local cache manifest: {:#}", err);
+            None
+          }
+        })
+        .unwrap_or_default();
+      let reverse_mapping = if use_reverse_mapping {
+        Some(
+          serialized
+            .modules
+            .iter()
+            .filter_map(|(url, module)| {
+              module.path.as_ref().map(|path| {
+                let path = if cfg!(windows) {
+                  PathBuf::from(path.split('/').collect::<Vec<_>>().join("\\"))
+                } else {
+                  PathBuf::from(path)
+                };
+                (path, url.clone())
+              })
+            })
+            .collect::<HashMap<_, _>>(),
+        )
+      } else {
+        None
+      };
+      Self {
+        serialized,
+        reverse_mapping,
+      }
+    }
+
+    pub fn get(
+      &self,
+      url: &Url,
+    ) -> Option<&SerializedLocalCacheManifestDataModule> {
+      self.serialized.modules.get(url)
+    }
+
+    pub fn get_reverse_mapping(&self, path: &Path) -> Option<Url> {
+      debug_assert!(self.reverse_mapping.is_some()); // only call this if you're in the lsp
+      self
+        .reverse_mapping
+        .as_ref()
+        .and_then(|mapping| mapping.get(path))
+        .cloned()
+    }
+
+    pub fn insert(
+      &mut self,
+      url: Url,
+      sub_path: &LocalCacheSubPath,
+      new_data: SerializedLocalCacheManifestDataModule,
+    ) {
+      if let Some(reverse_mapping) = &mut self.reverse_mapping {
+        reverse_mapping.insert(sub_path.as_relative_path(), url.clone());
+      }
+      self.serialized.modules.insert(url, new_data);
+    }
+
+    pub fn remove(&mut self, url: &Url, sub_path: &LocalCacheSubPath) -> bool {
+      if self.serialized.modules.remove(url).is_some() {
+        if let Some(reverse_mapping) = &mut self.reverse_mapping {
+          reverse_mapping.remove(&sub_path.as_relative_path());
+        }
+        true
+      } else {
+        false
+      }
+    }
+
+    pub fn as_json(&self) -> String {
+      serde_json::to_string_pretty(&self.serialized).unwrap()
+    }
+  }
+}
+
 #[cfg(test)]
 mod test {
   use super::*;
@@ -869,4 +1094,107 @@ mod test {
       );
     }
   }
+
+  #[test]
+  fn test_lsp_local_cache() {
+    let temp_dir = TempDir::new();
+    let global_cache_path = temp_dir.path().join("global");
+    let local_cache_path = temp_dir.path().join("local");
+    let global_cache =
+      Arc::new(GlobalHttpCache::new(global_cache_path.to_path_buf()));
+    let local_cache = LocalLspHttpCache::new(
+      local_cache_path.to_path_buf(),
+      global_cache.clone(),
+    );
+
+    // mapped url
+    {
+      let url = Url::parse("https://deno.land/x/mod.ts").unwrap();
+      let content = "export const test = 5;";
+      global_cache
+        .set(
+          &url,
+          HashMap::from([(
+            "content-type".to_string(),
+            "application/typescript".to_string(),
+          )]),
+          content.as_bytes(),
+        )
+        .unwrap();
+      let key = local_cache.cache_item_key(&url).unwrap();
+      assert_eq!(
+        String::from_utf8(local_cache.read_file_bytes(&key).unwrap().unwrap())
+          .unwrap(),
+        content
+      );
+
+      // check getting the file url works
+      let file_url = local_cache.get_file_url(&url);
+      let expected = local_cache_path
+        .uri_dir()
+        .join("deno.land/x/mod.ts")
+        .unwrap();
+      assert_eq!(file_url, Some(expected));
+
+      // get the reverse mapping
+      let mapping = local_cache.get_remote_url(
+        local_cache_path
+          .join("deno.land")
+          .join("x")
+          .join("mod.ts")
+          .as_path(),
+      );
+      assert_eq!(mapping.as_ref(), Some(&url));
+    }
+
+    // now try a file with a different content-type header
+    {
+      let url =
+        Url::parse("https://deno.land/x/different_content_type.ts").unwrap();
+      let content = "export const test = 5;";
+      global_cache
+        .set(
+          &url,
+          HashMap::from([(
+            "content-type".to_string(),
+            "application/javascript".to_string(),
+          )]),
+          content.as_bytes(),
+        )
+        .unwrap();
+      let key = local_cache.cache_item_key(&url).unwrap();
+      assert_eq!(
+        String::from_utf8(local_cache.read_file_bytes(&key).unwrap().unwrap())
+          .unwrap(),
+        content
+      );
+
+      let file_url = local_cache.get_file_url(&url).unwrap();
+      let path = file_url.to_file_path().unwrap();
+      assert!(path.exists());
+      let mapping = local_cache.get_remote_url(&path);
+      assert_eq!(mapping.as_ref(), Some(&url));
+    }
+
+    // try an http specifier that can't be mapped to the file system
+    {
+      let url = Url::parse("http://deno.land/INVALID/Module.ts?dev").unwrap();
+      let content = "export const test = 5;";
+      global_cache
+        .set(&url, HashMap::new(), content.as_bytes())
+        .unwrap();
+      let key = local_cache.cache_item_key(&url).unwrap();
+      assert_eq!(
+        String::from_utf8(local_cache.read_file_bytes(&key).unwrap().unwrap())
+          .unwrap(),
+        content
+      );
+
+      let file_url = local_cache.get_file_url(&url).unwrap();
+      let path = file_url.to_file_path().unwrap();
+      assert!(path.exists());
+      let mapping = local_cache.get_remote_url(&path);
+      assert_eq!(mapping.as_ref(), Some(&url));
+    }
+  }
 }

cli/cache/http_cache/mod.rs

@@ -16,6 +16,7 @@ mod local;
 pub use global::url_to_filename;
 pub use global::GlobalHttpCache;
 pub use local::LocalHttpCache;
+pub use local::LocalLspHttpCache;
 
 /// Cached metadata about a url.
 #[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]

cli/cache/mod.rs

@@ -38,6 +38,7 @@ pub use http_cache::CachedUrlMetadata;
 pub use http_cache::GlobalHttpCache;
 pub use http_cache::HttpCache;
 pub use http_cache::LocalHttpCache;
+pub use http_cache::LocalLspHttpCache;
 pub use incremental::IncrementalCache;
 pub use node::NodeAnalysisCache;
 pub use parsed_source::ParsedSourceCache;

cli/lsp/client.rs

@@ -154,11 +154,14 @@ impl OutsideLockClient {
 
   pub async fn publish_diagnostics(
     &self,
-    uri: lsp::Url,
+    uri: LspClientUrl,
     diags: Vec<lsp::Diagnostic>,
     version: Option<i32>,
   ) {
-    self.0.publish_diagnostics(uri, diags, version).await;
+    self
+      .0
+      .publish_diagnostics(uri.into_url(), diags, version)
+      .await;
   }
 }
 

cli/lsp/diagnostics.rs

@@ -12,6 +12,8 @@ use super::language_server::StateSnapshot;
 use super::performance::Performance;
 use super::tsc;
 use super::tsc::TsServer;
+use super::urls::LspClientUrl;
+use super::urls::LspUrlMap;
 
 use crate::args::LintOptions;
 use crate::graph_util;
@@ -54,6 +56,7 @@ pub struct DiagnosticServerUpdateMessage {
   pub snapshot: Arc<StateSnapshot>,
   pub config: Arc<ConfigSnapshot>,
   pub lint_options: LintOptions,
+  pub url_map: LspUrlMap,
 }
 
 struct DiagnosticRecord {
@@ -107,6 +110,7 @@ impl DiagnosticsPublisher {
     &self,
     source: DiagnosticSource,
     diagnostics: DiagnosticVec,
+    url_map: &LspUrlMap,
     token: &CancellationToken,
   ) -> usize {
     let mut diagnostics_by_specifier =
@@ -141,7 +145,9 @@ impl DiagnosticsPublisher {
         .client
         .when_outside_lsp_lock()
         .publish_diagnostics(
-          record.specifier,
+          url_map
+            .normalize_specifier(&record.specifier)
+            .unwrap_or(LspClientUrl::new(record.specifier)),
           all_specifier_diagnostics,
           version,
         )
@@ -169,7 +175,9 @@ impl DiagnosticsPublisher {
             .client
             .when_outside_lsp_lock()
             .publish_diagnostics(
-              specifier.clone(),
+              url_map
+                .normalize_specifier(specifier)
+                .unwrap_or_else(|_| LspClientUrl::new(specifier.clone())),
               Vec::new(),
               removed_value.version,
             )
@@ -366,9 +374,11 @@ impl DiagnosticsServer {
                     snapshot,
                     config,
                     lint_options,
+                    url_map,
                   },
                 batch_index,
               } = message;
+              let url_map = Arc::new(url_map);
 
               // cancel the previous run
               token.cancel();
@@ -383,6 +393,7 @@ impl DiagnosticsServer {
                 let ts_diagnostics_store = ts_diagnostics_store.clone();
                 let snapshot = snapshot.clone();
                 let config = config.clone();
+                let url_map = url_map.clone();
                 async move {
                   if let Some(previous_handle) = previous_ts_handle {
                     // Wait on the previous run to complete in order to prevent
@@ -419,7 +430,12 @@ impl DiagnosticsServer {
                   if !token.is_cancelled() {
                     ts_diagnostics_store.update(&diagnostics);
                     messages_len = diagnostics_publisher
-                      .publish(DiagnosticSource::Ts, diagnostics, &token)
+                      .publish(
+                        DiagnosticSource::Ts,
+                        diagnostics,
+                        &url_map,
+                        &token,
+                      )
                       .await;
 
                     if !token.is_cancelled() {
@@ -447,6 +463,7 @@ impl DiagnosticsServer {
                 let token = token.clone();
                 let snapshot = snapshot.clone();
                 let config = config.clone();
+                let url_map = url_map.clone();
                 async move {
                   if let Some(previous_handle) = previous_deps_handle {
                     previous_handle.await;
@@ -463,7 +480,12 @@ impl DiagnosticsServer {
                   let mut messages_len = 0;
                   if !token.is_cancelled() {
                     messages_len = diagnostics_publisher
-                      .publish(DiagnosticSource::Deno, diagnostics, &token)
+                      .publish(
+                        DiagnosticSource::Deno,
+                        diagnostics,
+                        &url_map,
+                        &token,
+                      )
                       .await;
 
                     if !token.is_cancelled() {
@@ -491,6 +513,7 @@ impl DiagnosticsServer {
                 let token = token.clone();
                 let snapshot = snapshot.clone();
                 let config = config.clone();
+                let url_map = url_map.clone();
                 async move {
                   if let Some(previous_handle) = previous_lint_handle {
                     previous_handle.await;
@@ -514,7 +537,12 @@ impl DiagnosticsServer {
                   let mut messages_len = 0;
                   if !token.is_cancelled() {
                     messages_len = diagnostics_publisher
-                      .publish(DiagnosticSource::Lint, diagnostics, &token)
+                      .publish(
+                        DiagnosticSource::Lint,
+                        diagnostics,
+                        &url_map,
+                        &token,
+                      )
                       .await;
 
                     if !token.is_cancelled() {

cli/lsp/documents.rs

@@ -969,6 +969,13 @@ impl Documents {
     }
   }
 
+  pub fn resolve_redirected(
+    &self,
+    specifier: &ModuleSpecifier,
+  ) -> Option<ModuleSpecifier> {
+    self.specifier_resolver.resolve(specifier)
+  }
+
   /// Return `true` if the specifier can be resolved to a document.
   pub fn exists(&self, specifier: &ModuleSpecifier) -> bool {
     let specifier = self.specifier_resolver.resolve(specifier);
@@ -1498,7 +1505,7 @@ impl Documents {
       self.resolve_dependency(specifier, maybe_node_resolver)
     } else {
       let media_type = doc.media_type();
-      Some((specifier.clone(), media_type))
+      Some((doc.specifier().clone(), media_type))
     }
   }
 

cli/lsp/language_server.rs

@@ -88,7 +88,7 @@ use crate::cache::DenoDir;
 use crate::cache::FastInsecureHasher;
 use crate::cache::GlobalHttpCache;
 use crate::cache::HttpCache;
-use crate::cache::LocalHttpCache;
+use crate::cache::LocalLspHttpCache;
 use crate::factory::CliFactory;
 use crate::file_fetcher::FileFetcher;
 use crate::graph_util;
@@ -204,7 +204,7 @@ pub struct Inner {
   /// An abstraction that handles interactions with TypeScript.
   pub ts_server: Arc<TsServer>,
   /// A map of specifiers and URLs used to translate over the LSP.
-  pub url_map: Arc<urls::LspUrlMap>,
+  pub url_map: urls::LspUrlMap,
 }
 
 impl LanguageServer {
@@ -905,16 +905,18 @@ impl Inner {
     self.module_registries_location = module_registries_location;
     // update the cache path
     let global_cache = Arc::new(GlobalHttpCache::new(dir.deps_folder_path()));
-    let cache: Arc<dyn HttpCache> =
-      match self.config.maybe_deno_modules_dir_path() {
-        Some(local_path) => {
-          Arc::new(LocalHttpCache::new(local_path, global_cache))
-        }
-        None => global_cache,
-      };
+    let maybe_local_cache =
+      self.config.maybe_deno_modules_dir_path().map(|local_path| {
+        Arc::new(LocalLspHttpCache::new(local_path, global_cache.clone()))
+      });
+    let cache: Arc<dyn HttpCache> = maybe_local_cache
+      .clone()
+      .map(|c| c as Arc<dyn HttpCache>)
+      .unwrap_or(global_cache);
     self.deps_http_cache = cache.clone();
     self.documents.set_cache(cache.clone());
     self.cache_metadata.set_cache(cache);
+    self.url_map.set_cache(maybe_local_cache);
     self.maybe_global_cache_path = new_cache_path;
     Ok(())
   }
@@ -2946,6 +2948,7 @@ impl Inner {
       snapshot: self.snapshot(),
       config: self.config.snapshot(),
       lint_options: self.lint_options.clone(),
+      url_map: self.url_map.clone(),
     };
     if let Err(err) = self.diagnostics_server.update(snapshot) {
       error!("Cannot update diagnostics: {}", err);

cli/lsp/tsc.rs

@@ -3214,12 +3214,16 @@ fn op_script_names(state: &mut OpState) -> Vec<String> {
         .filter_map(|dep| dep.get_type().or_else(|| dep.get_code())),
     );
     for specifier in specifiers {
-      if seen.insert(specifier.as_str()) && documents.exists(specifier) {
+      if seen.insert(specifier.as_str()) {
+        if let Some(specifier) = documents.resolve_redirected(specifier) {
           // only include dependencies we know to exist otherwise typescript will error
+          if documents.exists(&specifier) {
             result.push(specifier.to_string());
           }
         }
       }
+    }
+  }
 
   result
 }

cli/lsp/urls.rs

@@ -1,5 +1,6 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
+use crate::cache::LocalLspHttpCache;
 use crate::file_fetcher::map_content_type;
 
 use data_url::DataUrl;
@@ -12,6 +13,7 @@ use deno_core::url::Url;
 use deno_core::ModuleSpecifier;
 use once_cell::sync::Lazy;
 use std::collections::HashMap;
+use std::sync::Arc;
 
 /// Used in situations where a default URL needs to be used where otherwise a
 /// panic is undesired.
@@ -119,17 +121,31 @@ pub enum LspUrlKind {
 /// A bi-directional map of URLs sent to the LSP client and internal module
 /// specifiers. We need to map internal specifiers into `deno:` schema URLs
 /// to allow the Deno language server to manage these as virtual documents.
-#[derive(Debug, Default)]
-pub struct LspUrlMap(Mutex<LspUrlMapInner>);
+#[derive(Debug, Default, Clone)]
+pub struct LspUrlMap {
+  local_http_cache: Option<Arc<LocalLspHttpCache>>,
+  inner: Arc<Mutex<LspUrlMapInner>>,
+}
 
 impl LspUrlMap {
+  pub fn set_cache(&mut self, http_cache: Option<Arc<LocalLspHttpCache>>) {
+    self.local_http_cache = http_cache;
+  }
+
   /// Normalize a specifier that is used internally within Deno (or tsc) to a
   /// URL that can be handled as a "virtual" document by an LSP client.
   pub fn normalize_specifier(
     &self,
     specifier: &ModuleSpecifier,
   ) -> Result<LspClientUrl, AnyError> {
-    let mut inner = self.0.lock();
+    if let Some(cache) = &self.local_http_cache {
+      if matches!(specifier.scheme(), "http" | "https") {
+        if let Some(file_url) = cache.get_file_url(specifier) {
+          return Ok(LspClientUrl(file_url));
+        }
+      }
+    }
+    let mut inner = self.inner.lock();
     if let Some(url) = inner.get_url(specifier).cloned() {
       Ok(url)
     } else {
@@ -183,7 +199,16 @@ impl LspUrlMap {
   /// so we need to force it to in the mapping and nee to explicitly state whether
   /// this is a file or directory url.
   pub fn normalize_url(&self, url: &Url, kind: LspUrlKind) -> ModuleSpecifier {
-    let mut inner = self.0.lock();
+    if let Some(cache) = &self.local_http_cache {
+      if url.scheme() == "file" {
+        if let Ok(path) = url.to_file_path() {
+          if let Some(remote_url) = cache.get_remote_url(&path) {
+            return remote_url;
+          }
+        }
+      }
+    }
+    let mut inner = self.inner.lock();
     if let Some(specifier) = inner.get_specifier(url).cloned() {
       specifier
     } else {

cli/tests/integration/lsp_tests.rs

@@ -573,7 +573,7 @@ fn lsp_import_map_config_file_auto_discovered_symlink() {
   client.did_change_watched_files(json!({
     "changes": [{
       // the client will give a watched file changed event for the symlink's target
-      "uri": temp_dir.path().join("subdir/deno.json").canonicalize().uri(),
+      "uri": temp_dir.path().join("subdir/deno.json").canonicalize().uri_file(),
       "type": 2
     }]
   }));
@@ -601,7 +601,7 @@ fn lsp_import_map_config_file_auto_discovered_symlink() {
   client.did_change_watched_files(json!({
     "changes": [{
       // now still say that the target path has changed
-      "uri": temp_dir.path().join("subdir/deno.json").canonicalize().uri(),
+      "uri": temp_dir.path().join("subdir/deno.json").canonicalize().uri_file(),
       "type": 2
     }]
   }));
@@ -8777,13 +8777,13 @@ fn lsp_deno_modules_dir() {
 
   let mut client = context.new_lsp_command().build();
   client.initialize_default();
-  let file_uri = temp_dir.uri().join("file.ts").unwrap();
+  let local_file_uri = temp_dir.uri().join("file.ts").unwrap();
   client.did_open(json!({
     "textDocument": {
-      "uri": file_uri,
+      "uri": local_file_uri,
       "languageId": "typescript",
       "version": 1,
-      "text": "import { returnsHi } from 'http://localhost:4545/subdir/mod1.ts'; console.log(returnsHi());",
+      "text": "import { returnsHi } from 'http://localhost:4545/subdir/mod1.ts';\nconst test: string = returnsHi();\nconsole.log(test);",
     }
   }));
   let cache = |client: &mut LspClient| {
@@ -8791,7 +8791,7 @@ fn lsp_deno_modules_dir() {
       "deno/cache",
       json!({
         "referrer": {
-          "uri": file_uri,
+          "uri": local_file_uri,
         },
         "uris": [
           {
@@ -8850,11 +8850,113 @@ fn lsp_deno_modules_dir() {
   assert_eq!(diagnostics.all().len(), 0, "{:#?}", diagnostics); // cached
 
   // no caching necessary because it was already cached. It should exist now
-
   assert!(temp_dir
     .path()
     .join("deno_modules/http_localhost_4545/subdir/mod1.ts")
     .exists());
 
+  // the declaration should be found in the deno_modules directory
+  let res = client.write_request(
+    "textDocument/references",
+    json!({
+      "textDocument": {
+        "uri": local_file_uri,
+      },
+      "position": { "line": 0, "character": 9 }, // returnsHi
+      "context": {
+        "includeDeclaration": false
+      }
+    }),
+  );
+
+  // ensure that it's using the deno_modules directory
+  let references = res.as_array().unwrap();
+  assert_eq!(references.len(), 2, "references: {:#?}", references);
+  let uri = references[1]
+    .as_object()
+    .unwrap()
+    .get("uri")
+    .unwrap()
+    .as_str()
+    .unwrap();
+  let file_path = temp_dir
+    .path()
+    .join("deno_modules/http_localhost_4545/subdir/mod1.ts");
+  let remote_file_uri = file_path.uri_file();
+  assert_eq!(uri, remote_file_uri.as_str());
+
+  let file_text = file_path.read_to_string();
+  let diagnostics = client.did_open(json!({
+    "textDocument": {
+      "uri": remote_file_uri,
+      "languageId": "typescript",
+      "version": 1,
+      "text": file_text,
+    }
+  }));
+  assert_eq!(diagnostics.all(), Vec::new());
+
+  client.write_notification(
+    "textDocument/didChange",
+    json!({
+      "textDocument": {
+        "uri": remote_file_uri,
+        "version": 2
+      },
+      "contentChanges": [
+        {
+          "range": {
+            "start": { "line": 0, "character": 0 },
+            "end": { "line": 17, "character": 0 },
+          },
+          "text": "export function returnsHi(): number { return new Date(); }"
+        }
+      ]
+    }),
+  );
+
+  let diagnostics = client.read_diagnostics();
+
+  assert_eq!(
+    json!(
+      diagnostics
+        .messages_with_file_and_source(remote_file_uri.as_str(), "deno-ts")
+        .diagnostics
+    ),
+    json!([
+      {
+        "range": {
+          "start": { "line": 0, "character": 38 },
+          "end": { "line": 0, "character": 44 }
+        },
+        "severity": 1,
+        "code": 2322,
+        "source": "deno-ts",
+        "message": "Type 'Date' is not assignable to type 'number'."
+      }
+    ]),
+  );
+
+  assert_eq!(
+    json!(
+      diagnostics
+        .messages_with_file_and_source(local_file_uri.as_str(), "deno-ts")
+        .diagnostics
+    ),
+    json!([
+      {
+        "range": {
+          "start": { "line": 1, "character": 6 },
+          "end": { "line": 1, "character": 10 }
+        },
+        "severity": 1,
+        "code": 2322,
+        "source": "deno-ts",
+        "message": "Type 'number' is not assignable to type 'string'."
+      }
+    ]),
+  );
+  assert_eq!(diagnostics.all().len(), 2);
+
   client.shutdown();
 }

test_util/src/fs.rs

@@ -47,10 +47,14 @@ impl PathRef {
     PathRef(self.as_path().parent().unwrap().to_path_buf())
   }
 
-  pub fn uri(&self) -> Url {
+  pub fn uri_dir(&self) -> Url {
     Url::from_directory_path(self.as_path()).unwrap()
   }
 
+  pub fn uri_file(&self) -> Url {
+    Url::from_file_path(self.as_path()).unwrap()
+  }
+
   pub fn as_path(&self) -> &Path {
     self.0.as_path()
   }