From 2c8a0e791732ab00907ca11c3a4918ad26ead03f Mon Sep 17 00:00:00 2001
From: Nathan Whitaker <17734409+nathanwhit@users.noreply.github.com>
Date: Fri, 1 Nov 2024 19:10:35 -0700
Subject: [PATCH] fix(add): only add npm deps to package.json if it's at least
 as close as deno.json (#26683)

Fixes https://github.com/denoland/deno/issues/26653
---
 cli/tools/registry/pm.rs                      | 26 ++++++++++++++++++-
 .../package_json_and_deno_json/__test__.jsonc | 23 ++++++++++++++++
 .../subdir/deno.json                          |  4 +++
 .../package_json_and_deno_json/subdir/mod.ts  |  0
 .../subdir/prefer_if_closer_deno.json.out     |  9 +++++++
 5 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 tests/specs/add/package_json_and_deno_json/subdir/deno.json
 create mode 100644 tests/specs/add/package_json_and_deno_json/subdir/mod.ts
 create mode 100644 tests/specs/add/package_json_and_deno_json/subdir/prefer_if_closer_deno.json.out

diff --git a/cli/tools/registry/pm.rs b/cli/tools/registry/pm.rs
index d1be901d67..4e03879983 100644
--- a/cli/tools/registry/pm.rs
+++ b/cli/tools/registry/pm.rs
@@ -1,5 +1,6 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
+use std::path::Path;
 use std::path::PathBuf;
 use std::sync::Arc;
 
@@ -333,6 +334,14 @@ fn load_configs(
   Ok((cli_factory, npm_config, deno_config))
 }
 
+fn path_distance(a: &Path, b: &Path) -> usize {
+  let diff = pathdiff::diff_paths(a, b);
+  let Some(diff) = diff else {
+    return usize::MAX;
+  };
+  diff.components().count()
+}
+
 pub async fn add(
   flags: Arc<Flags>,
   add_flags: AddFlags,
@@ -357,6 +366,21 @@ pub async fn add(
     }
   }
 
+  let start_dir = cli_factory.cli_options()?.start_dir.dir_path();
+
+  // only prefer to add npm deps to `package.json` if there isn't a closer deno.json.
+  // example: if deno.json is in the CWD and package.json is in the parent, we should add
+  // npm deps to deno.json, since it's closer
+  let prefer_npm_config = match (npm_config.as_ref(), deno_config.as_ref()) {
+    (Some(npm), Some(deno)) => {
+      let npm_distance = path_distance(&npm.path, &start_dir);
+      let deno_distance = path_distance(&deno.path, &start_dir);
+      npm_distance <= deno_distance
+    }
+    (Some(_), None) => true,
+    (None, _) => false,
+  };
+
   let http_client = cli_factory.http_client_provider();
   let deps_http_cache = cli_factory.global_http_cache()?;
   let mut deps_file_fetcher = FileFetcher::new(
@@ -455,7 +479,7 @@ pub async fn add(
       selected_package.selected_version
     );
 
-    if selected_package.package_name.starts_with("npm:") {
+    if selected_package.package_name.starts_with("npm:") && prefer_npm_config {
       if let Some(npm) = &mut npm_config {
         npm.add(selected_package, dev);
       } else {
diff --git a/tests/specs/add/package_json_and_deno_json/__test__.jsonc b/tests/specs/add/package_json_and_deno_json/__test__.jsonc
index 0beee02d15..8d67a07c82 100644
--- a/tests/specs/add/package_json_and_deno_json/__test__.jsonc
+++ b/tests/specs/add/package_json_and_deno_json/__test__.jsonc
@@ -41,6 +41,29 @@
           "output": "good\n"
         }
       ]
+    },
+    "only_prefers_package_json_if_closer": {
+      "steps": [
+        {
+          "cwd": "./subdir",
+          "args": "add npm:@denotest/esm-basic jsr:@denotest/add npm:@denotest/say-hello",
+          "output": "[WILDCARD]"
+        },
+        {
+          "args": [
+            "eval",
+            "console.log(Deno.readTextFileSync('package.json').trim())"
+          ],
+          "output": "{}\n"
+        },
+        {
+          "args": [
+            "eval",
+            "console.log(Deno.readTextFileSync('./subdir/deno.json').trim())"
+          ],
+          "output": "subdir/prefer_if_closer_deno.json.out"
+        }
+      ]
     }
   }
 }
diff --git a/tests/specs/add/package_json_and_deno_json/subdir/deno.json b/tests/specs/add/package_json_and_deno_json/subdir/deno.json
new file mode 100644
index 0000000000..cc54bbd8a2
--- /dev/null
+++ b/tests/specs/add/package_json_and_deno_json/subdir/deno.json
@@ -0,0 +1,4 @@
+{
+  "name": "@test/subdir",
+  "exports": "./mod.ts"
+}
diff --git a/tests/specs/add/package_json_and_deno_json/subdir/mod.ts b/tests/specs/add/package_json_and_deno_json/subdir/mod.ts
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/specs/add/package_json_and_deno_json/subdir/prefer_if_closer_deno.json.out b/tests/specs/add/package_json_and_deno_json/subdir/prefer_if_closer_deno.json.out
new file mode 100644
index 0000000000..8a5819d503
--- /dev/null
+++ b/tests/specs/add/package_json_and_deno_json/subdir/prefer_if_closer_deno.json.out
@@ -0,0 +1,9 @@
+{
+  "name": "@test/subdir",
+  "exports": "./mod.ts",
+  "imports": {
+    "@denotest/add": "jsr:@denotest/add@^1.0.0",
+    "@denotest/esm-basic": "npm:@denotest/esm-basic@^1.0.0",
+    "@denotest/say-hello": "npm:@denotest/say-hello@^1.0.0"
+  }
+}