feat: add support for yarn test (Vitest)

ARCHITECTURE.md

@@ -224,7 +224,7 @@ Database: ~/.local/share/rtk/history.db
 
 ## Module Organization
 
-### Complete Module Map (30 Modules)
+### Complete Module Map (31 Modules)
 
 ```
 ┌────────────────────────────────────────────────────────────────────────┐
@@ -260,6 +260,7 @@ JS/TS STACK       lint_cmd.rs       lint                   84%        ✓
                   prisma_cmd.rs     prisma                 88%        ✓
                   vitest_cmd.rs     vitest                 99.5%      ✓
                   pnpm_cmd.rs       pnpm                   70-90%     ✓
+                  yarn_cmd.rs       yarn test              90%        ✓
 
 CONTAINERS        container.rs      podman, docker         60-80%     ✓
 
@@ -288,14 +289,14 @@ SHARED            utils.rs          Helpers                N/A        ✓
                   tee.rs            Full output recovery   N/A        ✓
 ```
 
-**Total: 50 modules** (32 command modules + 18 infrastructure modules)
+**Total: 51 modules** (33 command modules + 18 infrastructure modules)
 
 ### Module Count Breakdown
 
-- **Command Modules**: 31 (directly exposed to users)
+- **Command Modules**: 32 (directly exposed to users)
 - **Infrastructure Modules**: 18 (utils, filter, tracking, tee, config, init, gain, etc.)
 - **Git Commands**: 7 operations (status, diff, log, add, commit, push, branch/checkout)
-- **JS/TS Tooling**: 8 modules (modern frontend/fullstack development)
+- **JS/TS Tooling**: 9 modules (modern frontend/fullstack development)
 - **Python Tooling**: 3 modules (ruff, pytest, pip)
 - **Go Tooling**: 2 modules (go test/build/vet, golangci-lint)
 
@@ -369,7 +370,7 @@ Strategy            Modules              Technique               Reduction
    │ Mixed        │      Hide passing        "  • test_auth"
    └──────────────┘
 
-   Used by: vitest, playwright, runner (test mode)
+   Used by: vitest, yarn test, playwright, runner (test mode)
 
 8. TREE COMPRESSION
    ┌──────────────┐
@@ -401,7 +402,8 @@ Strategy            Modules              Technique               Reduction
    │ Mixed format │      Extract failures     Failure details
    └──────────────┘
 
-   Used by: pytest (text state machine: test_name → PASSED/FAILED)
+   Used by: pytest (text state machine: test_name → PASSED/FAILED),
+   yarn test (Jest: state machine PASS/FAIL → summary; Vitest: regex summary)
 
 12. NDJSON STREAMING
    ┌──────────────┐
@@ -752,7 +754,7 @@ let mut cmd = if is_pnpm {
     Command::new("npx").arg("--no-install").arg("--").arg("eslint")
 };
 
-Affects: lint, tsc, next, prettier, playwright, prisma, vitest, pnpm
+Affects: lint, tsc, next, prettier, playwright, prisma, vitest, pnpm, yarn
 ```
 
 **Why This Matters**:
@@ -1016,7 +1018,9 @@ Modules with Exit Code Preservation:
 • lint_cmd.rs (linter failures)
 • tsc_cmd.rs (TypeScript errors)
 • vitest_cmd.rs (test failures)
+• yarn_cmd.rs (test failures)
 • playwright_cmd.rs (E2E test failures)
+• yarn_cmd.rs (test failures)
 ```
 
 ---
@@ -1481,6 +1485,6 @@ When implementing a new command, consider:
 
 ---
 
-**Last Updated**: 2026-02-22
-**Architecture Version**: 2.2
+**Last Updated**: 2026-02-27
+**Architecture Version**: 2.3
 **rtk Version**: 0.22.2

CLAUDE.md

@@ -230,6 +230,7 @@ rtk gain --history | grep proxy
 | pip_cmd.rs | pip/uv package manager | JSON parsing, auto-detect uv (70-85% reduction) |
 | go_cmd.rs | Go commands | NDJSON for test, text for build/vet (80-90% reduction) |
 | golangci_cmd.rs | golangci-lint | JSON parsing, group by rule (85% reduction) |
+| yarn_cmd.rs | Yarn test runner | State machine Jest parser (90% reduction) |
 | tee.rs | Full output recovery | Save raw output to file on failure, print hint for LLM re-read |
 | utils.rs | Shared utilities | Package manager detection, common formatting |
 | discover/ | Claude Code history analysis | Scan JSONL sessions, classify commands, report missed savings |

README.md

@@ -175,6 +175,7 @@ rtk pytest                       # Python tests (failures only, 90% reduction)
 rtk pip list                     # Python packages (auto-detect uv, 70% reduction)
 rtk go test                      # Go tests (NDJSON, 90% reduction)
 rtk golangci-lint run            # Go linting (JSON, 85% reduction)
+rtk yarn test                    # Yarn (Vitest only) tests (failures only, 90% reduction)
 ```
 
 ### Data & Analytics
@@ -267,6 +268,13 @@ rtk prisma migrate dev --name x  # Migration summary
 rtk prisma db-push               # Schema push summary
 ```
 
+### Yarn
+```bash
+rtk yarn test                    # Jest test output, failures only (90% reduction)
+rtk yarn test --coverage         # With extra args passed through
+rtk yarn install                 # Passthrough for non-test subcommands
+```
+
 ### Python & Go Stack
 ```bash
 # Python
@@ -625,6 +633,8 @@ The hook is included in this repository at `.claude/hooks/rtk-rewrite.sh`. To us
 | `pip list/install/outdated` | `rtk pip ...` |
 | `go test/build/vet` | `rtk go ...` |
 | `golangci-lint run` | `rtk golangci-lint run` |
+| `yarn test` | `rtk yarn test` |
+| `yarn <subcommand>` | `rtk yarn <subcommand>` |
 | `docker ps/images/logs` | `rtk docker ...` |
 | `kubectl get/logs` | `rtk kubectl ...` |
 | `curl` | `rtk curl` |

hooks/rtk-rewrite.sh

@@ -194,6 +194,12 @@ elif echo "$MATCH_CMD" | grep -qE '^go[[:space:]]+vet([[:space:]]|$)'; then
   REWRITTEN="${ENV_PREFIX}$(echo "$CMD_BODY" | sed 's/^go vet/rtk go vet/')"
 elif echo "$MATCH_CMD" | grep -qE '^golangci-lint([[:space:]]|$)'; then
   REWRITTEN="${ENV_PREFIX}$(echo "$CMD_BODY" | sed 's/^golangci-lint/rtk golangci-lint/')"
+
+# --- Yarn tooling ---
+elif echo "$MATCH_CMD" | grep -qE '^yarn[[:space:]]+test([[:space:]]|$)'; then
+  REWRITTEN="${ENV_PREFIX}$(echo "$CMD_BODY" | sed 's/^yarn test/rtk yarn test/')"
+elif echo "$MATCH_CMD" | grep -qE '^yarn[[:space:]]'; then
+  REWRITTEN="${ENV_PREFIX}$(echo "$CMD_BODY" | sed 's/^yarn /rtk yarn /')"
 fi
 
 # If no rewrite needed, approve as-is

scripts/test-all.sh

@@ -413,7 +413,18 @@ else
     skip "golangci-lint not installed"
 fi
 
-# ── 29. Global flags ────────────────────────────────
+# ── 29. Yarn (conditional) ─────────────────────────
+
+section "Yarn (conditional)"
+
+if command -v yarn &>/dev/null; then
+    assert_help    "rtk yarn"       rtk yarn --help
+    assert_help    "rtk yarn test"  rtk yarn test -h
+else
+    skip "yarn not installed"
+fi
+
+# ── 30. Global flags ────────────────────────────────
 
 section "Global flags"
 

src/discover/registry.rs

@@ -71,6 +71,7 @@ const PATTERNS: &[&str] = &[
     r"^curl\s+",
     r"^wget\s+",
     r"^(python3?\s+-m\s+)?mypy(\s|$)",
+    r"^yarn\s+(test|install|add|remove|build|start|dev)",
 ];
 
 const RULES: &[RtkRule] = &[
@@ -226,6 +227,13 @@ const RULES: &[RtkRule] = &[
         subcmd_savings: &[],
         subcmd_status: &[],
     },
+    RtkRule {
+        rtk_cmd: "rtk yarn",
+        category: "Tests",
+        savings_pct: 90.0,
+        subcmd_savings: &[("test", 90.0)],
+        subcmd_status: &[],
+    },
     RtkRule {
         rtk_cmd: "rtk mypy",
         category: "Build",
@@ -791,4 +799,30 @@ mod tests {
             }
         );
     }
+
+    #[test]
+    fn test_classify_yarn_test() {
+        assert_eq!(
+            classify_command("yarn test"),
+            Classification::Supported {
+                rtk_equivalent: "rtk yarn",
+                category: "Tests",
+                estimated_savings_pct: 90.0,
+                status: RtkStatus::Existing,
+            }
+        );
+    }
+
+    #[test]
+    fn test_classify_yarn_test_with_args() {
+        assert_eq!(
+            classify_command("yarn test --coverage"),
+            Classification::Supported {
+                rtk_equivalent: "rtk yarn",
+                category: "Tests",
+                estimated_savings_pct: 90.0,
+                status: RtkStatus::Existing,
+            }
+        );
+    }
 }

src/main.rs

@@ -48,6 +48,7 @@ mod utils;
 mod vitest_cmd;
 mod wc_cmd;
 mod wget_cmd;
+mod yarn_cmd;
 
 use anyhow::{Context, Result};
 use clap::{Parser, Subcommand};
@@ -548,6 +549,12 @@ enum Commands {
         #[arg(short, long, default_value = "7")]
         since: u64,
     },
+
+    /// Yarn commands with compact output
+    Yarn {
+        #[command(subcommand)]
+        command: YarnCommands,
+    },
 }
 
 #[derive(Subcommand)]
@@ -863,6 +870,19 @@ enum GoCommands {
     Other(Vec<OsString>),
 }
 
+#[derive(Subcommand)]
+enum YarnCommands {
+    /// Run tests with compact output (90% token reduction)
+    Test {
+        /// Additional yarn test arguments
+        #[arg(trailing_var_arg = true, allow_hyphen_values = true)]
+        args: Vec<String>,
+    },
+    /// Passthrough: runs any unsupported yarn subcommand directly
+    #[command(external_subcommand)]
+    Other(Vec<OsString>),
+}
+
 fn main() -> Result<()> {
     let cli = Cli::parse();
 
@@ -1448,6 +1468,15 @@ fn main() -> Result<()> {
             hook_audit_cmd::run(since, cli.verbose)?;
         }
 
+        Commands::Yarn { command } => match command {
+            YarnCommands::Test { args } => {
+                yarn_cmd::run_test(&args, cli.verbose)?;
+            }
+            YarnCommands::Other(args) => {
+                yarn_cmd::run_other(&args, cli.verbose)?;
+            }
+        },
+
         Commands::Proxy { args } => {
             use std::process::Command;
 
@@ -1563,4 +1592,31 @@ mod tests {
             _ => panic!("Expected Git Commit command"),
         }
     }
+
+    #[test]
+    fn test_yarn_test_parsing() {
+        let cli =
+            Cli::try_parse_from(["rtk", "yarn", "test", "--coverage", "--watchAll=false"]).unwrap();
+        match cli.command {
+            Commands::Yarn {
+                command: YarnCommands::Test { args },
+            } => {
+                assert_eq!(args, vec!["--coverage", "--watchAll=false"]);
+            }
+            _ => panic!("Expected Yarn Test command"),
+        }
+    }
+
+    #[test]
+    fn test_yarn_passthrough() {
+        let cli = Cli::try_parse_from(["rtk", "yarn", "install"]).unwrap();
+        match cli.command {
+            Commands::Yarn {
+                command: YarnCommands::Other(args),
+            } => {
+                assert_eq!(args[0], "install");
+            }
+            _ => panic!("Expected Yarn Other command"),
+        }
+    }
 }