From 13b758889f977e55907bff8eebb9c015ac8fa2be Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 22 Sep 2026 07:49:00 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20perf:=20cache=20tech.toml=20parsing?=
 =?UTF-8?q?=20during=20dependency=20resolution?=
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Introduces a HashMap to cache the parsed entry paths from `tech.toml` files during module resolution in `cli/src/project.rs`. This avoids redundantly reading and parsing the TOML manifest when a package is imported multiple times.

Co-authored-by: Tcode-Motion <188012755+Tcode-Motion@users.noreply.github.com>
---
 .gitignore         | 7 +++++++
 cli/src/project.rs | 9 +++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/.gitignore b/.gitignore
index 77ef54c8..643b31f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -82,3 +82,10 @@ bin/
 build/
 dist/
 site/
+mock_heavy_project/
+mock_project/
+mock_project_fast/
+run_bench.sh
+run_heavy_bench.sh
+mock_many_imports/
+run_many_imports.sh
diff --git a/cli/src/project.rs b/cli/src/project.rs
index 8b15e1c7..32254841 100644
--- a/cli/src/project.rs
+++ b/cli/src/project.rs
@@ -163,6 +163,7 @@ impl ProjectBuildGraph {
 
         // 2. Resolve imports recursively
         let mut visited = HashSet::new();
+        let mut manifest_cache: HashMap<PathBuf, String> = HashMap::new();
         while let Some((fid, path, pkg_name)) = to_resolve.pop() {
             if visited.contains(&fid) {
                 continue;
@@ -256,14 +257,18 @@ impl ProjectBuildGraph {
                     }
                     if !try_file.exists() {
                         let manifest_toml = pkg_path.join("tech.toml");
-                        if manifest_toml.exists() {
+                        if let Some(cached_entry) = manifest_cache.get(&manifest_toml) {
+                            try_file = pkg_path.join(cached_entry);
+                        } else if manifest_toml.exists() {
                             if let Ok(toml_content) = std::fs::read_to_string(&manifest_toml) {
                                 if let Ok(manifest) =
                                     toml::from_str::<techscript_package_manager::Manifest>(
                                         &toml_content,
                                     )
                                 {
-                                    try_file = pkg_path.join(manifest.package.entry);
+                                    let entry = manifest.package.entry;
+                                    try_file = pkg_path.join(&entry);
+                                    manifest_cache.insert(manifest_toml, entry);
                                 }
                             }
                         }