feat(yarn): add yarn command with intelligent script routing

README.md

@@ -191,6 +191,9 @@ rtk rubocop                     # Ruby linting (JSON, -60%+)
 
 ### Package Managers
 ```bash
+rtk yarn test                   # Intelligent script routing + filtering
+rtk yarn build                  # Next.js build compact via yarn
+rtk yarn typecheck              # TypeScript errors via yarn
 rtk pnpm list                   # Compact dependency tree
 rtk pip list                    # Python packages (auto-detect uv)
 rtk pip outdated                # Outdated packages
@@ -362,6 +365,7 @@ cp hooks/opencode-rtk.ts ~/.config/opencode/plugins/rtk.ts
 | `docker ps/images/logs` | `rtk docker ...` |
 | `kubectl get/logs` | `rtk kubectl ...` |
 | `curl` | `rtk curl` |
+| `yarn test/build/lint/typecheck` | `rtk yarn ...` |
 | `pnpm list/outdated` | `rtk pnpm ...` |
 
 Commands already using `rtk`, heredocs (`<<`), and unrecognized commands pass through unchanged.

src/main.rs

@@ -67,6 +67,7 @@ mod verify_cmd;
 mod vitest_cmd;
 mod wc_cmd;
 mod wget_cmd;
+mod yarn_cmd;
 
 use anyhow::{Context, Result};
 use clap::error::ErrorKind;
@@ -538,6 +539,13 @@ enum Commands {
         args: Vec<String>,
     },
 
+    /// Yarn scripts with intelligent routing (test, build, lint, typecheck -> specialized filters)
+    Yarn {
+        /// Yarn arguments (script name + options)
+        #[arg(trailing_var_arg = true, allow_hyphen_values = true)]
+        args: Vec<String>,
+    },
+
     /// npx with intelligent routing (tsc, eslint, prisma -> specialized filters)
     Npx {
         /// npx arguments (command + options)
@@ -1896,6 +1904,10 @@ fn main() -> Result<()> {
             npm_cmd::run(&args, cli.verbose, cli.skip_env)?;
         }
 
+        Commands::Yarn { args } => {
+            yarn_cmd::run(&args, cli.verbose, cli.skip_env)?;
+        }
+
         Commands::Curl { args } => {
             curl_cmd::run(&args, cli.verbose)?;
         }
@@ -2291,6 +2303,7 @@ fn is_operational_command(cmd: &Commands) -> bool {
             | Commands::Playwright { .. }
             | Commands::Cargo { .. }
             | Commands::Npm { .. }
+            | Commands::Yarn { .. }
             | Commands::Npx { .. }
             | Commands::Curl { .. }
             | Commands::Ruff { .. }

src/tsc_cmd.rs

@@ -55,7 +55,7 @@ pub fn run(args: &[String], verbose: u8) -> Result<()> {
 }
 
 /// Filter TypeScript compiler output - group errors by file, show every error
-fn filter_tsc_output(output: &str) -> String {
+pub fn filter_tsc_output(output: &str) -> String {
     lazy_static::lazy_static! {
         // Pattern: src/file.ts(12,5): error TS2322: Type 'string' is not assignable to type 'number'.
         static ref TSC_ERROR: Regex = Regex::new(