fix(pm): correct workspace-root handling for Yarn and Bun

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_add_yarn4_with_workspace/snapshots/command_add_yarn4_with_workspace.md

@@ -5,6 +5,7 @@
 should add package to workspace root
 
 ```
+warn: yarn >=2 does not support --workspace-root.
 ➤ YN0000: · Yarn <version>
 ➤ YN0000: ┌ Resolution step
 ➤ YN0085: │ + testnpm2@npm:1.0.1
@@ -46,6 +47,7 @@ should add package to workspace root
 should add @vite-plus-test/utils to workspace root
 
 ```
+warn: yarn >=2 does not support --workspace-root.
 warn: yarn does not support --workspace.
 ➤ YN0000: · Yarn <version>
 ➤ YN0000: ┌ Resolution step

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_update_bun/snapshots.toml

@@ -4,7 +4,7 @@ vp = "global"
 skip-platforms = ["windows"]
 steps = [
   { argv = ["vp", "update", "--help"], comment = "should show help", continue-on-failure = true },
-  { argv = ["vp", "update", "testnpm2"], comment = "should update package within semver range" },
+  { argv = ["vp", "update", "testnpm2", "--workspace-root"], comment = "warns about unsupported --workspace-root and updates within semver range" },
   { argv = ["vpt", "print-file", "package.json"], continue-on-failure = true },
   { argv = ["vp", "up", "testnpm2", "--latest"], comment = "should update to absolute latest version" },
   { argv = ["vpt", "print-file", "package.json"], continue-on-failure = true },

crates/vp_cli_snapshots/tests/cli_snapshots/fixtures/command_update_bun/snapshots/command_update_bun.md

@@ -35,11 +35,12 @@ Options:
 Documentation: https://viteplus.dev/guide/install
 ```
 
-## `vp update testnpm2`
+## `vp update testnpm2 --workspace-root`
 
-should update package within semver range
+warns about unsupported --workspace-root and updates within semver range
 
 ```
+warn: bun does not support --workspace-root.
 bun update <version> (<hash>)
 
  test-vite-plus-package@1.0.0

crates/vp_pm_cli/src/resolution/commands/add.rs

@@ -36,7 +36,7 @@ pub struct AddArgs {
     pub(crate) filter: Vec<String>,
 
     /// Add to workspace root
-    #[arg(short = 'w', long, not_supported(bun))]
+    #[arg(short = 'w', long, not_supported(yarn >= "2", bun))]
     pub(crate) workspace_root: bool,
 
     /// Only add if package exists in workspace (pnpm-specific)
@@ -219,7 +219,7 @@ impl Resolve<AddArgs> for Yarn {
             cmd.arg("workspaces").arg("foreach").arg("--all");
             cmd.repeated("--include", args.filter.iter());
         }
-        cmd.arg("add");
+        cmd.arg("add").arg_if("-W", args.workspace_root && !self.is_berry());
         match args.save_dependency.target() {
             Some(SaveDependencyTarget::Dev) => {
                 cmd.arg("--dev");
@@ -481,7 +481,7 @@ mod tests {
         let command = expect_run(resolution.outcome);
 
         assert_eq!(command.program, "yarn");
-        assert_eq!(command.args, vec!["add", "--dev", "typescript"]);
+        assert_eq!(command.args, vec!["add", "-W", "--dev", "typescript"]);
         assert!(resolution.diagnostics.is_empty());
     }
 
@@ -574,21 +574,19 @@ mod tests {
     }
 
     #[test]
-    fn yarn_drops_workspace_root_without_warning() {
+    fn yarn_berry_drops_unsupported_workspace_root() {
         let mut args = add_args(&["react"]);
         args.workspace_root = true;
+        let resolution = resolve(&yarn("4.1.0"), args);
+        let command = expect_run(resolution.outcome);
 
-        let classic = resolve(&yarn("1.22.22"), args.clone());
-        let classic_command = expect_run(classic.outcome);
-        let berry = resolve(&yarn("4.1.0"), args);
-        let berry_command = expect_run(berry.outcome);
-
-        assert_eq!(classic_command.program, "yarn");
-        assert_eq!(classic_command.args, vec!["add", "react"]);
-        assert_eq!(berry_command.program, "yarn");
-        assert_eq!(berry_command.args, vec!["add", "react"]);
-        assert!(classic.diagnostics.is_empty());
-        assert!(berry.diagnostics.is_empty());
+        assert_eq!(command.program, "yarn");
+        assert_eq!(command.args, vec!["add", "react"]);
+        assert_eq!(resolution.diagnostics.len(), 1);
+        assert_eq!(
+            resolution.diagnostics[0].message,
+            "yarn >=2 does not support --workspace-root."
+        );
     }
 
     #[test]

crates/vp_pm_cli/src/resolution/commands/install.rs

@@ -74,7 +74,7 @@ pub struct InstallArgs {
     pub(crate) filter: Vec<String>,
 
     /// Install in workspace root only
-    #[arg(short = 'w', long, not_supported(bun))]
+    #[arg(short = 'w', long, not_supported(yarn, bun))]
     pub(crate) workspace_root: bool,
 
     /// Save exact version (only when adding packages)
@@ -228,7 +228,6 @@ impl Yarn {
             .arg_if("--ignore-scripts", args.ignore_scripts)
             .arg_if("--silent", args.silent)
             .arg_if("--no-lockfile", args.no_lockfile)
-            .arg_if("-W", args.workspace_root)
             .extend(args.pass_through_args.iter());
         cmd.into()
     }

crates/vp_pm_cli/src/resolution/commands/update.rs

@@ -37,7 +37,7 @@ pub struct UpdateArgs {
     pub(crate) filter: Vec<String>,
 
     /// Include workspace root
-    #[arg(short = 'w', long)]
+    #[arg(short = 'w', long, not_supported(yarn, bun))]
     pub(crate) workspace_root: bool,
 
     /// Update only devDependencies

crates/vp_pm_cli/src/resolution/commands/why.rs

@@ -32,7 +32,7 @@ pub struct WhyArgs {
     pub(crate) filter: Vec<String>,
 
     /// Check in workspace root
-    #[arg(short = 'w', long, not_supported(bun))]
+    #[arg(short = 'w', long, not_supported(yarn, bun))]
     pub(crate) workspace_root: bool,
 
     /// Only production dependencies