Fix YesTask execution

[Jarred-Sumner]

Summary

• allow YesTask to stop after output closes
• expose YesTask alias in Task.zig
• add bun shell test for yes using TestBuilder

Testing

• bun bd test test/js/bun/shell/commands/yes.test.ts (fails: WebKit download blocked)

---

https://chatgpt.com/codex/tasks/task_e_6858849743ec8328878335caea994223

[robobun]

^{Updated 6:30 PM PT - Jun 22nd, 2025}

❌ @Jarred-Sumner, your commit 9cc96b9 has 3 failures in Build #19061:

• test/cli/install/bun-upgrade.test.ts - 1 failing on 🍎 14 x64
• test/cli/install/bun-upgrade.test.ts - 1 failing on 🍎 13 x64
• test/js/bun/shell/commands/yes.test.ts - code 3 on 🪟 2019 x64
• test/js/bun/shell/commands/yes.test.ts - code 3 on 🪟 2019 x64-baseline
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 24.04 aarch64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 20.04 aarch64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 3.21 aarch64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 12 aarch64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 3.21 x64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 3.21 x64-baseline
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 12 x64-asan
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 24.04 x64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 20.04 x64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 24.04 x64-baseline
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 12 x64
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 12 x64-baseline
• test/js/bun/shell/commands/yes.test.ts - SIGKILL on 🐧 20.04 x64-baseline
• test/js/bun/shell/commands/yes.test.ts - timeout on 🍎 14 aarch64
• test/js/bun/shell/commands/yes.test.ts - timeout on 🍎 13 aarch64
• test/js/bun/shell/commands/yes.test.ts - timeout on 🍎 14 x64
• test/js/bun/shell/commands/yes.test.ts - timeout on 🍎 13 x64
• test/js/bun/spawn/spawn.test.ts - 1 failing on 🪟 2019 x64-baseline
• test/js/bun/spawn/spawn.test.ts - 1 failing on 🪟 2019 x64

---

🧪   To try this PR locally:

bunx bun-pr 20580

That installs a local version of the PR into your bun-20580 executable, so you can run:

bun-20580 --bun