fix(install): Make sure target node_modules exists when symlinking

cli/npm/managed/resolvers/local.rs

@@ -10,6 +10,7 @@ use std::cmp::Ordering;
 use std::collections::hash_map::Entry;
 use std::collections::BTreeMap;
 use std::collections::HashMap;
+use std::collections::HashSet;
 use std::fs;
 use std::path::Path;
 use std::path::PathBuf;
@@ -620,6 +621,9 @@ async fn sync_resolution_with_fs(
 
   let mut found_names: HashMap<&String, &PackageNv> = HashMap::new();
 
+  // set of node_modules in workspace packages that we've already ensured exist
+  let mut existing_child_node_modules_dirs: HashSet<PathBuf> = HashSet::new();
+
   // 4. Create symlinks for package json dependencies
   {
     for remote in npm_install_deps_provider.remote_pkgs() {
@@ -667,8 +671,15 @@ async fn sync_resolution_with_fs(
       );
       if install_in_child {
         // symlink the dep into the package's child node_modules folder
-        let dest_path =
-          remote.base_dir.join("node_modules").join(&remote.alias);
+        let dest_node_modules = remote.base_dir.join("node_modules");
+        if !existing_child_node_modules_dirs.contains(&dest_node_modules) {
+          fs::create_dir_all(&dest_node_modules).with_context(|| {
+            format!("Creating '{}'", dest_node_modules.display())
+          })?;
+          existing_child_node_modules_dirs.insert(dest_node_modules.clone());
+        }
+        let mut dest_path = dest_node_modules;
+        dest_path.push(&remote.alias);
 
         symlink_package_dir(&local_registry_package_path, &dest_path)?;
       } else {

tests/specs/install/workspace_node_modules_not_exists/__test__.jsonc

@@ -0,0 +1,15 @@
+// Regression test for https://github.com/denoland/deno/issues/25493
+//
+// `deno install` where we need to create a `node_modules` for a workspace member
+// due to conflicting package versions, but when we go to set it up, the
+// symlink target path (`package2/node_modules/chalk`) has `node_modules` as its parent,
+// and it doesn't exist yet
+{
+  "tempDir": true,
+  "steps": [
+    {
+      "args": "install",
+      "output": "install.out"
+    }
+  ]
+}

tests/specs/install/workspace_node_modules_not_exists/deno.json

@@ -0,0 +1,7 @@
+{
+  "nodeModulesDir": "auto",
+  "workspace": [
+    "./package1",
+    "./package2"
+  ]
+}

tests/specs/install/workspace_node_modules_not_exists/install.out

@@ -0,0 +1,22 @@
+[UNORDERED_START]
+Download http://localhost:4260/chalk
+Download http://localhost:4260/ansi-styles
+Download http://localhost:4260/supports-color
+Download http://localhost:4260/color-convert
+Download http://localhost:4260/has-flag
+Download http://localhost:4260/color-name
+Download http://localhost:4260/chalk/chalk-4.1.2.tgz
+Download http://localhost:4260/chalk/chalk-5.0.1.tgz
+Download http://localhost:4260/supports-color/supports-color-7.2.0.tgz
+Download http://localhost:4260/ansi-styles/ansi-styles-4.3.0.tgz
+Download http://localhost:4260/has-flag/has-flag-4.0.0.tgz
+Download http://localhost:4260/color-convert/color-convert-2.0.1.tgz
+Download http://localhost:4260/color-name/color-name-1.1.4.tgz
+Initialize supports-color@7.2.0
+Initialize chalk@4.1.2
+Initialize ansi-styles@4.3.0
+Initialize color-name@1.1.4
+Initialize color-convert@2.0.1
+Initialize has-flag@4.0.0
+Initialize chalk@5.0.1
+[UNORDERED_END]

tests/specs/install/workspace_node_modules_not_exists/package1/package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "chalk": "4.1.2"
+  }
+}

tests/specs/install/workspace_node_modules_not_exists/package2/package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "chalk": "5.0.1"
+  }
+}