feat: map yarnpkg to yarn, so it works across yarn versions

Author: rytmis

crates/volta-core/src/run/mod.rs

@@ -96,8 +96,7 @@ fn get_executor(
                     binary::command(exe, args, session)
                 }
             }
-            Some("yarn") => yarn::command(args, session, "yarn"),
-            Some("yarnpkg") => yarn::command(args, session, "yarnpkg"),
+            Some("yarn") | Some("yarnpkg") => yarn::command(args, session),
             _ => binary::command(exe, args, session),
         }
     }

crates/volta-core/src/run/yarn.rs

@@ -16,11 +16,7 @@ use crate::session::{ActivityKind, Session};
 ///
 /// If the command is _not_ a global add / remove or we don't have a default platform, then
 /// we will allow Yarn to execute the command as usual.
-pub(super) fn command(
-    args: &[OsString],
-    session: &mut Session,
-    yarn_executable: &str,
-) -> Fallible<Executor> {
+pub(super) fn command(args: &[OsString], session: &mut Session) -> Fallible<Executor> {
     session.add_event_start(ActivityKind::Yarn);
     // Don't re-evaluate the context or global install interception if this is a recursive call
     let platform = match env::var_os(RECURSION_ENV_VAR) {
@@ -37,7 +33,7 @@ pub(super) fn command(
         }
     };
 
-    Ok(ToolCommand::new(yarn_executable, args, platform, ToolKind::Yarn).into())
+    Ok(ToolCommand::new("yarn", args, platform, ToolKind::Yarn).into())
 }
 
 /// Determine the execution context (PATH and failure error message) for Yarn