fix: skip node_modules/.vite-temp/ from fspy tracking

Vite writes transient compiled config files to node_modules/.vite-temp/
during builds. These files are both read and written by the build process,
causing fspy to detect a read-write overlap that prevents caching with
"not cached because it modified its input".

Exclude node_modules/.vite-temp/ paths from fspy tracking, similar to the
existing .git exclusion. These are ephemeral build artifacts that should
never affect cache correctness.

Closes voidzero-dev/vite-plus#1095

Author: fengmk2

crates/vite_task/src/session/execute/spawn.rs

@@ -211,6 +211,11 @@ pub async fn spawn_with_tracking(
                 return None;
             }
 
+            // Skip Vite temp config files (transient build artifacts)
+            if relative.as_str().contains("node_modules/.vite-temp/") {
+                return None;
+            }
+
             if !resolved_negatives.is_empty()
                 && resolved_negatives.iter().any(|neg| neg.is_match(relative.as_str()))
             {

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/build.mjs

@@ -0,0 +1,18 @@
+// Simulates Vite's behavior during build:
+// 1. Reads the source file (tracked as input by fspy)
+// 2. Writes a temp config to node_modules/.vite-temp/ (also tracked by fspy)
+// Without the .vite-temp exclusion, step 2 causes a read-write overlap
+// that prevents caching.
+
+import { readFileSync, writeFileSync, mkdirSync } from 'node:fs';
+
+// Read source (tracked as input)
+const source = readFileSync('src/index.ts', 'utf-8');
+
+// Simulate Vite writing temp config (read-write to .vite-temp)
+const tempDir = 'node_modules/.vite-temp';
+mkdirSync(tempDir, { recursive: true });
+const tempFile = `${tempDir}/vite.config.ts.timestamp-${Date.now()}.mjs`;
+writeFileSync(tempFile, `// compiled config\nexport default {};`);
+
+console.log(`built: ${source.trim()}`);

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "cache-skip-vite-temp",
+  "private": true
+}

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/snapshots.toml

@@ -0,0 +1,18 @@
+# Tests that node_modules/.vite-temp/ is excluded from fspy tracking,
+# so tasks writing to .vite-temp (like Vite config compilation) are still cached.
+# See: https://github.com/voidzero-dev/vite-plus/issues/1095
+
+[[e2e]]
+name = "vite-temp read-write does not prevent caching"
+steps = [
+  "vt run build # first run: cache miss",
+  "vt run build # second run: should hit cache despite .vite-temp write",
+]
+
+[[e2e]]
+name = "source change still causes cache miss"
+steps = [
+  "vt run build # first run: cache miss",
+  "replace-file-content src/index.ts world universe # modify real source",
+  "vt run build # cache miss: source changed",
+]

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/snapshots/source change still causes cache miss.snap

@@ -0,0 +1,12 @@
+---
+source: crates/vite_task_bin/tests/e2e_snapshots/main.rs
+expression: e2e_outputs
+---
+> vt run build # first run: cache miss
+$ node build.mjs
+built: export const hello = "world";
+> replace-file-content src/index.ts world universe # modify real source
+
+> vt run build # cache miss: source changed
+$ node build.mjs ○ cache miss: 'src/index.ts' modified, executing
+built: export const hello = "universe";

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/snapshots/vite-temp read-write does not prevent caching.snap

@@ -0,0 +1,13 @@
+---
+source: crates/vite_task_bin/tests/e2e_snapshots/main.rs
+expression: e2e_outputs
+---
+> vt run build # first run: cache miss
+$ node build.mjs
+built: export const hello = "world";
+> vt run build # second run: should hit cache despite .vite-temp write
+$ node build.mjs ◉ cache hit, replaying
+built: export const hello = "world";
+
+---
+vt run: cache hit, <duration> saved.

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/src/index.ts

@@ -0,0 +1 @@
+export const hello = 'world';

crates/vite_task_bin/tests/e2e_snapshots/fixtures/cache-skip-vite-temp/vite-task.json

@@ -0,0 +1,9 @@
+{
+  "cache": true,
+  "tasks": {
+    "build": {
+      "command": "node build.mjs",
+      "cache": true
+    }
+  }
+}