fix(cli-run): silence wait noise and suppress raw arrow escape input

src/cli/run/stdin-suppression.test.ts

@@ -0,0 +1,89 @@
+import { describe, it, expect, mock } from "bun:test"
+import { EventEmitter } from "node:events"
+import { suppressRunInput } from "./stdin-suppression"
+
+type FakeStdin = EventEmitter & {
+  isTTY?: boolean
+  isRaw?: boolean
+  setRawMode: ReturnType<typeof mock<(mode: boolean) => void>>
+  isPaused: ReturnType<typeof mock<() => boolean>>
+  resume: ReturnType<typeof mock<() => void>>
+  pause: ReturnType<typeof mock<() => void>>
+}
+
+function createFakeStdin(options: {
+  isTTY?: boolean
+  isRaw?: boolean
+  paused?: boolean
+} = {}): FakeStdin {
+  const emitter = new EventEmitter() as FakeStdin
+  emitter.isTTY = options.isTTY ?? true
+  emitter.isRaw = options.isRaw ?? false
+  emitter.setRawMode = mock((mode: boolean) => {
+    emitter.isRaw = mode
+  })
+  emitter.isPaused = mock(() => options.paused ?? false)
+  emitter.resume = mock(() => {})
+  emitter.pause = mock(() => {})
+  return emitter
+}
+
+describe("suppressRunInput", () => {
+  it("ignores non-tty stdin", () => {
+    // given
+    const stdin = createFakeStdin({ isTTY: false })
+    const onInterrupt = mock(() => {})
+
+    // when
+    const restore = suppressRunInput(stdin, onInterrupt)
+    restore()
+
+    // then
+    expect(stdin.setRawMode).not.toHaveBeenCalled()
+    expect(stdin.resume).not.toHaveBeenCalled()
+    expect(onInterrupt).not.toHaveBeenCalled()
+  })
+
+  it("enables raw mode and restores it", () => {
+    // given
+    const stdin = createFakeStdin({ isRaw: false, paused: true })
+
+    // when
+    const restore = suppressRunInput(stdin)
+    restore()
+
+    // then
+    expect(stdin.setRawMode).toHaveBeenNthCalledWith(1, true)
+    expect(stdin.resume).toHaveBeenCalledTimes(1)
+    expect(stdin.setRawMode).toHaveBeenNthCalledWith(2, false)
+    expect(stdin.pause).toHaveBeenCalledTimes(1)
+  })
+
+  it("calls interrupt handler on ctrl-c", () => {
+    // given
+    const stdin = createFakeStdin()
+    const onInterrupt = mock(() => {})
+    const restore = suppressRunInput(stdin, onInterrupt)
+
+    // when
+    stdin.emit("data", "\u0003")
+    restore()
+
+    // then
+    expect(onInterrupt).toHaveBeenCalledTimes(1)
+  })
+
+  it("does not call interrupt handler on arrow-key escape", () => {
+    // given
+    const stdin = createFakeStdin()
+    const onInterrupt = mock(() => {})
+    const restore = suppressRunInput(stdin, onInterrupt)
+
+    // when
+    stdin.emit("data", "\u001b[A")
+    restore()
+
+    // then
+    expect(onInterrupt).not.toHaveBeenCalled()
+  })
+})