feat: allow comments (JSONC) in vite-task.json

Use jsonc-parser to parse vite-task.json, enabling // line comments,
/* */ block comments, and trailing commas. Add comments to several
test fixture files to exercise this.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: branchseer

Cargo.lock

@@ -75,6 +75,7 @@ fspy_test_utils = { path = "crates/fspy_test_utils" }
 futures = "0.3.31"
 futures-util = "0.3.31"
 insta = "1.44.3"
+jsonc-parser = { version = "0.29.0", features = ["serde"] }
 libc = "0.2.172"
 memmap2 = "0.9.7"
 monostate = "1.0.2"

Cargo.toml

@@ -1,3 +1,4 @@
 {
+  // Smoke test: enables caching for all package.json scripts.
   "cacheScripts": true
 }

crates/vite_task_bin/tests/e2e_snapshots/fixtures/vite-task-smoke/vite-task.json

@@ -10,6 +10,7 @@ rust-version.workspace = true
 anyhow = { workspace = true }
 async-trait = { workspace = true }
 clap = { workspace = true, features = ["derive"] }
+jsonc-parser = { workspace = true }
 monostate = { workspace = true }
 petgraph = { workspace = true }
 serde = { workspace = true, features = ["derive"] }

crates/vite_task_graph/Cargo.toml

@@ -33,7 +33,9 @@ impl UserConfigLoader for JsonUserConfigLoader {
             }
             Err(err) => return Err(err.into()),
         };
-        let user_config: UserRunConfig = serde_json::from_str(&config_content)?;
+        let json_value = jsonc_parser::parse_to_serde_value(&config_content, &Default::default())?
+            .unwrap_or_default();
+        let user_config: UserRunConfig = serde_json::from_value(json_value)?;
         Ok(Some(user_config))
     }
 }

crates/vite_task_graph/src/loader.rs

@@ -1,3 +1,4 @@
 {
+  // Enables caching for all package.json scripts in the workspace.
   "cacheScripts": true
 }

crates/vite_task_plan/tests/plan_snapshots/fixtures/cache-scripts-enabled/vite-task.json

@@ -1,3 +1,4 @@
 {
+  // Enables caching for all package.json scripts in the workspace.
   "cacheScripts": true
 }

crates/vite_task_plan/tests/plan_snapshots/fixtures/comprehensive-task-graph/vite-task.json

@@ -1,4 +1,6 @@
 {
+  // This workspace root has no package.json — only pnpm-workspace.yaml.
+  // vite-task.json should still be loaded and applied.
   "cacheScripts": true,
   "tasks": {
     "deploy": {