feat(e2e): add interactive TTY mode with expectrl for stdin testing

Cargo.toml

@@ -63,6 +63,7 @@ derive_more = "2.0.1"
 diff-struct = "0.5.3"
 directories = "6.0.0"
 elf = { version = "0.8.0", default-features = false }
+expectrl = "0.8.0"
 flate2 = "1.0.35"
 fspy = { path = "crates/fspy" }
 fspy_detours_sys = { path = "crates/fspy_detours_sys" }

crates/vite_task_bin/Cargo.toml

@@ -24,6 +24,7 @@ which = { workspace = true }
 [dev-dependencies]
 copy_dir = { workspace = true }
 cow-utils = { workspace = true }
+expectrl = { workspace = true }
 insta = { workspace = true, features = ["glob", "json", "redactions", "filters", "ron"] }
 regex = { workspace = true }
 serde = { workspace = true, features = ["derive", "rc"] }

crates/vite_task_bin/tests/e2e_snapshots/fixtures/stdin-passthrough/echo-stdin.js

@@ -0,0 +1,22 @@
+// Use writeSync to avoid buffering issues
+const fs = require('fs');
+
+// First, verify we're running in a TTY (should print "true" when using expectrl PTY)
+fs.writeSync(1, 'TTY: ' + String(process.stdin.isTTY) + '\n');
+
+// Signal the test runner to write "hello from stdin" to our stdin
+fs.writeSync(1, '[write-stdin:hello from stdin]');
+
+// Signal that we're done with stdin commands (this triggers EOF handling)
+fs.writeSync(1, '[write-stdin:]');
+
+// Read stdin asynchronously - the test runner will send data then EOF
+process.stdin.setEncoding('utf8');
+process.stdin.once('readable', () => {
+  const chunk = process.stdin.read();
+  if (chunk !== null) {
+    fs.writeSync(1, chunk);
+  }
+  fs.writeSync(1, 'Done\n');
+  process.exit(0);
+});

crates/vite_task_bin/tests/e2e_snapshots/fixtures/stdin-passthrough/package.json

@@ -1,6 +1,3 @@
 {
-  "name": "stdin-passthrough",
-  "scripts": {
-    "echo-stdin": "node -e \"process.stdin.pipe(process.stdout)\""
-  }
+  "name": "stdin-passthrough"
 }

crates/vite_task_bin/tests/e2e_snapshots/fixtures/stdin-passthrough/snapshots.toml

@@ -1,7 +1,7 @@
-# Tests that stdin is passed through to tasks
+# Tests that stdin is passed through to tasks with interactive TTY
 
 [[e2e]]
 name = "stdin passthrough to single task"
 steps = [
-  { cmd = "vite run echo-stdin", stdin = "hello from stdin" },
+  { cmd = "vite run echo-stdin", interactive = true },
 ]

crates/vite_task_bin/tests/e2e_snapshots/fixtures/stdin-passthrough/snapshots/stdin passthrough to single task.snap

@@ -1,12 +1,16 @@
 ---
 source: crates/vite_task_bin/tests/e2e_snapshots/main.rs
-assertion_line: 203
 expression: e2e_outputs
 input_file: crates/vite_task_bin/tests/e2e_snapshots/fixtures/stdin-passthrough
 ---
 > vite run echo-stdin
-$ node -e "process.stdin.pipe(process.stdout)"
-hello from stdin
+$ node echo-stdin.js
+TTY: true
+$ node echo-stdin.js
+TTY: true
+[write-stdin:hello from stdin][write-stdin:]hello from stdin
+Done
+
 
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     Vite+ Task Runner • Execution Summary
@@ -17,6 +21,6 @@ Performance:  0% cache hit rate
 
 Task Details:
 ────────────────────────────────────────────────
-  [1] stdin-passthrough#echo-stdin: $ node -e "process.stdin.pipe(process.stdout)" ✓
+  [1] stdin-passthrough#echo-stdin: $ node echo-stdin.js ✓
       → Cache miss: no previous cache entry found
 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

crates/vite_task_bin/tests/e2e_snapshots/fixtures/stdin-passthrough/vite.config.json

@@ -0,0 +1,7 @@
+{
+  "tasks": {
+    "echo-stdin": {
+      "command": "node echo-stdin.js"
+    }
+  }
+}