Add support for --only-dev to uv sync and uv export

crates/uv-cli/src/lib.rs

@@ -2395,6 +2395,12 @@ pub struct RunArgs {
     #[arg(long, overrides_with("dev"))]
     pub no_dev: bool,
 
+    /// Omit non-development dependencies.
+    ///
+    /// The project itself will also be omitted.
+    #[arg(long, conflicts_with("no_dev"))]
+    pub only_dev: bool,
+
     /// The command to run.
     ///
     /// If the path to a Python script (i.e., ending in `.py`), it will be
@@ -2541,6 +2547,12 @@ pub struct SyncArgs {
     #[arg(long, overrides_with("dev"))]
     pub no_dev: bool,
 
+    /// Omit non-development dependencies.
+    ///
+    /// The project itself will also be omitted.
+    #[arg(long, conflicts_with("no_dev"))]
+    pub only_dev: bool,
+
     /// Do not remove extraneous packages present in the environment.
     ///
     /// When enabled, uv will make the minimum necessary changes to satisfy the requirements.
@@ -2977,6 +2989,12 @@ pub struct ExportArgs {
     #[arg(long, overrides_with("dev"))]
     pub no_dev: bool,
 
+    /// Omit non-development dependencies.
+    ///
+    /// The project itself will also be omitted.
+    #[arg(long, conflicts_with("no_dev"))]
+    pub only_dev: bool,
+
     /// Include hashes for all dependencies.
     #[arg(long, overrides_with("no_hashes"), hide = true)]
     pub hashes: bool,

crates/uv-configuration/src/dev.rs

@@ -0,0 +1,53 @@
+use either::Either;
+use uv_normalize::GroupName;
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
+pub enum DevMode {
+    /// Include development dependencies.
+    #[default]
+    Include,
+    /// Exclude development dependencies.
+    Exclude,
+    /// Only include development dependencies, excluding all other dependencies.
+    Only,
+}
+
+impl DevMode {
+    /// Determine the [`DevMode`] policy from the command-line arguments.
+    pub fn from_args(dev: bool, no_dev: bool, only_dev: bool) -> Self {
+        if only_dev {
+            Self::Only
+        } else if no_dev {
+            Self::Exclude
+        } else if dev {
+            Self::Include
+        } else {
+            Self::default()
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone)]
+pub enum DevSpecification<'group> {
+    /// Include dev dependencies from the specified group.
+    Include(&'group [GroupName]),
+    /// Do not include dev dependencies.
+    Exclude,
+    /// Include dev dependencies from the specified group, and exclude all non-dev dependencies.
+    Only(&'group [GroupName]),
+}
+
+impl<'group> DevSpecification<'group> {
+    /// Returns an [`Iterator`] over the group names to include.
+    pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
+        match self {
+            Self::Exclude => Either::Left(std::iter::empty()),
+            Self::Include(groups) | Self::Only(groups) => Either::Right(groups.iter()),
+        }
+    }
+
+    /// Returns `true` if the specification allows for production dependencies.
+    pub fn prod(&self) -> bool {
+        matches!(self, Self::Exclude | Self::Include(_))
+    }
+}

crates/uv-configuration/src/lib.rs

@@ -3,6 +3,7 @@ pub use build_options::*;
 pub use concurrency::*;
 pub use config_settings::*;
 pub use constraints::*;
+pub use dev::*;
 pub use export_format::*;
 pub use extras::*;
 pub use hash::*;
@@ -20,6 +21,7 @@ mod build_options;
 mod concurrency;
 mod config_settings;
 mod constraints;
+mod dev;
 mod export_format;
 mod extras;
 mod hash;

crates/uv-resolver/src/lock/mod.rs

@@ -30,7 +30,7 @@ use pypi_types::{
     redact_git_credentials, HashDigest, ParsedArchiveUrl, ParsedGitUrl, Requirement,
     RequirementSource, ResolverMarkerEnvironment,
 };
-use uv_configuration::{BuildOptions, ExtrasSpecification, InstallOptions};
+use uv_configuration::{BuildOptions, DevSpecification, ExtrasSpecification, InstallOptions};
 use uv_distribution::DistributionDatabase;
 use uv_fs::{relative_to, PortablePath, PortablePathBuf};
 use uv_git::{GitReference, GitSha, RepositoryReference, ResolvedRepositoryReference};
@@ -540,7 +540,7 @@ impl Lock {
         marker_env: &ResolverMarkerEnvironment,
         tags: &Tags,
         extras: &ExtrasSpecification,
-        dev: &[GroupName],
+        dev: DevSpecification<'_>,
         build_options: &BuildOptions,
         install_options: &InstallOptions,
     ) -> Result<Resolution, LockError> {
@@ -558,26 +558,28 @@ impl Lock {
                     name: root_name.clone(),
                 })?;
 
-            // Add the base package.
-            queue.push_back((root, None));
+            if dev.prod() {
+                // Add the base package.
+                queue.push_back((root, None));
 
-            // Add any extras.
-            match extras {
-                ExtrasSpecification::None => {}
-                ExtrasSpecification::All => {
-                    for extra in root.optional_dependencies.keys() {
-                        queue.push_back((root, Some(extra)));
+                // Add any extras.
+                match extras {
+                    ExtrasSpecification::None => {}
+                    ExtrasSpecification::All => {
+                        for extra in root.optional_dependencies.keys() {
+                            queue.push_back((root, Some(extra)));
+                        }
                     }
-                }
-                ExtrasSpecification::Some(extras) => {
-                    for extra in extras {
-                        queue.push_back((root, Some(extra)));
+                    ExtrasSpecification::Some(extras) => {
+                        for extra in extras {
+                            queue.push_back((root, Some(extra)));
+                        }
                     }
                 }
             }
 
             // Add any dev dependencies.
-            for group in dev {
+            for group in dev.iter() {
                 for dep in root.dev_dependencies.get(group).into_iter().flatten() {
                     if dep.complexified_marker.evaluate(marker_env, &[]) {
                         let dep_dist = self.find_by_id(&dep.package_id);
@@ -596,7 +598,7 @@ impl Lock {
 
         // Add any dependency groups that are exclusive to the workspace root (e.g., dev
         // dependencies in (legacy) non-project workspace roots).
-        for group in dev {
+        for group in dev.iter() {
             for dependency in project.group(group) {
                 if dependency.marker.evaluate(marker_env, &[]) {
                     let root_name = &dependency.name;

crates/uv-resolver/src/lock/requirements_txt.rs

@@ -7,16 +7,16 @@ use std::path::{Component, Path, PathBuf};
 use either::Either;
 use petgraph::visit::IntoNodeReferences;
 use petgraph::{Directed, Graph};
-use rustc_hash::{FxHashMap, FxHashSet};
+use rustc_hash::{FxBuildHasher, FxHashMap, FxHashSet};
 use url::Url;
 
 use distribution_filename::{DistExtension, SourceDistExtension};
 use pep508_rs::MarkerTree;
 use pypi_types::{ParsedArchiveUrl, ParsedGitUrl};
-use uv_configuration::{ExtrasSpecification, InstallOptions};
+use uv_configuration::{DevSpecification, ExtrasSpecification, InstallOptions};
 use uv_fs::Simplified;
 use uv_git::GitReference;
-use uv_normalize::{ExtraName, GroupName, PackageName};
+use uv_normalize::{ExtraName, PackageName};
 
 use crate::graph_ops::marker_reachability;
 use crate::lock::{Package, PackageId, Source};
@@ -42,46 +42,68 @@ impl<'lock> RequirementsTxtExport<'lock> {
         lock: &'lock Lock,
         root_name: &PackageName,
         extras: &ExtrasSpecification,
-        dev: &[GroupName],
+        dev: DevSpecification<'_>,
         hashes: bool,
         install_options: &'lock InstallOptions,
     ) -> Result<Self, LockError> {
         let size_guess = lock.packages.len();
         let mut petgraph = LockGraph::with_capacity(size_guess, size_guess);
+        let mut inverse = FxHashMap::with_capacity_and_hasher(size_guess, FxBuildHasher);
 
         let mut queue: VecDeque<(&Package, Option<&ExtraName>)> = VecDeque::new();
-        let mut inverse = FxHashMap::default();
+        let mut seen = FxHashSet::default();
 
         // Add the workspace package to the queue.
         let root = lock
             .find_by_name(root_name)
             .expect("found too many packages matching root")
             .expect("could not find root");
 
-        // Add the base package.
-        queue.push_back((root, None));
+        if dev.prod() {
+            // Add the base package.
+            queue.push_back((root, None));
 
-        // Add any extras.
-        match extras {
-            ExtrasSpecification::None => {}
-            ExtrasSpecification::All => {
-                for extra in root.optional_dependencies.keys() {
-                    queue.push_back((root, Some(extra)));
+            // Add any extras.
+            match extras {
+                ExtrasSpecification::None => {}
+                ExtrasSpecification::All => {
+                    for extra in root.optional_dependencies.keys() {
+                        queue.push_back((root, Some(extra)));
+                    }
                 }
-            }
-            ExtrasSpecification::Some(extras) => {
-                for extra in extras {
-                    queue.push_back((root, Some(extra)));
+                ExtrasSpecification::Some(extras) => {
+                    for extra in extras {
+                        queue.push_back((root, Some(extra)));
+                    }
                 }
             }
+
+            // Add the root package to the graph.
+            inverse.insert(&root.id, petgraph.add_node(root));
         }
 
-        // Add the root package to the graph.
-        inverse.insert(&root.id, petgraph.add_node(root));
+        // Add any dev dependencies.
+        for group in dev.iter() {
+            for dep in root.dev_dependencies.get(group).into_iter().flatten() {
+                let dep_dist = lock.find_by_id(&dep.package_id);
 
-        // Create all the relevant nodes.
-        let mut seen = FxHashSet::default();
+                // Add the dependency to the graph.
+                if let Entry::Vacant(entry) = inverse.entry(&dep.package_id) {
+                    entry.insert(petgraph.add_node(dep_dist));
+                }
 
+                if seen.insert((&dep.package_id, None)) {
+                    queue.push_back((dep_dist, None));
+                }
+                for extra in &dep.extra {
+                    if seen.insert((&dep.package_id, Some(extra))) {
+                        queue.push_back((dep_dist, Some(extra)));
+                    }
+                }
+            }
+        }
+
+        // Create all the relevant nodes.
         while let Some((package, extra)) = queue.pop_front() {
             let index = inverse[&package.id];
 
@@ -94,11 +116,7 @@ impl<'lock> RequirementsTxtExport<'lock> {
                         .flatten(),
                 )
             } else {
-                Either::Right(package.dependencies.iter().chain(
-                    dev.iter().flat_map(|group| {
-                        package.dev_dependencies.get(group).into_iter().flatten()
-                    }),
-                ))
+                Either::Right(package.dependencies.iter())
             };
 
             for dep in deps {

crates/uv/src/commands/project/add.rs

@@ -16,7 +16,7 @@ use uv_auth::{store_credentials_from_url, Credentials};
 use uv_cache::Cache;
 use uv_client::{BaseClientBuilder, Connectivity, FlatIndexClient, RegistryClientBuilder};
 use uv_configuration::{
-    Concurrency, Constraints, ExtrasSpecification, InstallOptions, SourceStrategy,
+    Concurrency, Constraints, DevMode, ExtrasSpecification, InstallOptions, SourceStrategy,
 };
 use uv_dispatch::BuildDispatch;
 use uv_distribution::DistributionDatabase;
@@ -729,17 +729,17 @@ async fn lock_and_sync(
     let (extras, dev) = match dependency_type {
         DependencyType::Production => {
             let extras = ExtrasSpecification::None;
-            let dev = false;
+            let dev = DevMode::Exclude;
             (extras, dev)
         }
         DependencyType::Dev => {
             let extras = ExtrasSpecification::None;
-            let dev = true;
+            let dev = DevMode::Include;
             (extras, dev)
         }
         DependencyType::Optional(ref group_name) => {
             let extras = ExtrasSpecification::Some(vec![group_name.clone()]);
-            let dev = false;
+            let dev = DevMode::Exclude;
             (extras, dev)
         }
     };

crates/uv/src/commands/project/export.rs

@@ -7,7 +7,9 @@ use std::path::PathBuf;
 
 use uv_cache::Cache;
 use uv_client::Connectivity;
-use uv_configuration::{Concurrency, ExportFormat, ExtrasSpecification, InstallOptions};
+use uv_configuration::{
+    Concurrency, DevMode, DevSpecification, ExportFormat, ExtrasSpecification, InstallOptions,
+};
 use uv_fs::CWD;
 use uv_normalize::{PackageName, DEV_DEPENDENCIES};
 use uv_python::{PythonDownloads, PythonPreference, PythonRequest};
@@ -30,7 +32,7 @@ pub(crate) async fn export(
     install_options: InstallOptions,
     output_file: Option<PathBuf>,
     extras: ExtrasSpecification,
-    dev: bool,
+    dev: DevMode,
     locked: bool,
     frozen: bool,
     python: Option<String>,
@@ -111,10 +113,10 @@ pub(crate) async fn export(
     };
 
     // Include development dependencies, if requested.
-    let dev = if dev {
-        vec![DEV_DEPENDENCIES.clone()]
-    } else {
-        vec![]
+    let dev = match dev {
+        DevMode::Include => DevSpecification::Include(std::slice::from_ref(&DEV_DEPENDENCIES)),
+        DevMode::Exclude => DevSpecification::Exclude,
+        DevMode::Only => DevSpecification::Only(std::slice::from_ref(&DEV_DEPENDENCIES)),
     };
 
     // Write the resolved dependencies to the output channel.
@@ -127,7 +129,7 @@ pub(crate) async fn export(
                 &lock,
                 project.project_name(),
                 &extras,
-                &dev,
+                dev,
                 hashes,
                 &install_options,
             )?;

crates/uv/src/commands/project/remove.rs

@@ -6,7 +6,7 @@ use owo_colors::OwoColorize;
 use pep508_rs::PackageName;
 use uv_cache::Cache;
 use uv_client::Connectivity;
-use uv_configuration::{Concurrency, ExtrasSpecification, InstallOptions};
+use uv_configuration::{Concurrency, DevMode, ExtrasSpecification, InstallOptions};
 use uv_fs::{Simplified, CWD};
 use uv_python::{PythonDownloads, PythonPreference, PythonRequest};
 use uv_scripts::Pep723Script;
@@ -189,7 +189,7 @@ pub(crate) async fn remove(
     // Perform a full sync, because we don't know what exactly is affected by the removal.
     // TODO(ibraheem): Should we accept CLI overrides for this? Should we even sync here?
     let extras = ExtrasSpecification::All;
-    let dev = true;
+    let dev = DevMode::Include;
     let install_options = InstallOptions::default();
 
     // Initialize any shared state.