add cache

Author: Boshen

src/cache/cached_path.rs

@@ -28,7 +28,10 @@ pub struct CachedPathImpl {
     pub canonicalized: OnceLock<Weak<CachedPathImpl>>,
     pub node_modules: OnceLock<Option<Weak<CachedPathImpl>>>,
     pub package_json: OnceLock<Option<PackageJsonIndex>>,
+    /// `tsconfig.json` found at path.
     pub tsconfig: OnceLock<Option<Arc<TsConfig>>>,
+    /// `tsconfig.json` after resolving `references`, `files`, `include` and `extend`.
+    pub resolved_tsconfig: OnceLock<Option<Arc<TsConfig>>>,
 }
 
 impl CachedPathImpl {
@@ -50,6 +53,7 @@ impl CachedPathImpl {
             node_modules: OnceLock::new(),
             package_json: OnceLock::new(),
             tsconfig: OnceLock::new(),
+            resolved_tsconfig: OnceLock::new(),
         }
     }
 }

src/tsconfig_resolver.rs

@@ -58,13 +58,18 @@ impl<Fs: FileSystem> ResolverGeneric<Fs> {
         let span = tracing::debug_span!("find_tsconfig", path = ?path);
         let _enter = span.enter();
         let cached_path = self.cache.value(path);
-        self.find_tsconfig_impl(&cached_path, &mut Ctx::default()).map(|option_tsconfig| {
-            option_tsconfig.map(|tsconfig| {
-                let r = TsConfig::resolve_tsconfig_solution(tsconfig, path);
-                tracing::debug!(path = ?path, ret = ?r);
-                r
+        cached_path
+            .resolved_tsconfig
+            .get_or_try_init(|| {
+                self.find_tsconfig_impl(&cached_path, &mut Ctx::default()).map(|option_tsconfig| {
+                    option_tsconfig.map(|tsconfig| {
+                        let r = TsConfig::resolve_tsconfig_solution(tsconfig, path);
+                        tracing::debug!(path = ?path, ret = ?r);
+                        r
+                    })
+                })
             })
-        })
+            .cloned()
     }
 
     /// Find tsconfig.json of a path by traversing parent directories.