Implement auto-download feature for syncback command

- Enhanced the `syncback` command to automatically download Roblox place files from the asset delivery API, allowing for zero-argument usage.
- Updated `Cargo.toml` to include compression features for `reqwest` and moved `tempfile` to dependencies.
- Introduced a new `download` argument in `SyncbackCommand` to specify place IDs for downloading.
- Implemented logic to resolve input file paths, prioritizing downloads when necessary.
- Added sourcemap generation after successful syncback and refreshed the git index if in a repository.
- Updated tests to validate the new download functionality and sourcemap creation.

.cursor/plans/destructive_syncback_mode_acb8cb54.plan.md

@@ -5,7 +5,7 @@ todos: []
 isProject: false
 ---
 
-# Destructive Syncback Mode
+# Destructive Syncback Mode (Clean by Default)
 
 ## Root Cause Analysis
 
@@ -50,41 +50,46 @@ if let Some(old_child) = old_child_map.remove(new_child.name.as_str()) {
 }
 ```
 
-## Solution: Add `--clean` Flag
+## Solution: Clean Mode by Default with `--incremental` Flag
 
-Add a `--clean` flag that makes syncback treat all instances as "new" by setting `old` references to `None`, ensuring consistent output regardless of existing filesystem state.
+Make clean (destructive) mode the default behavior, with an `--incremental` flag to opt into the legacy structure-preserving behavior.
+
+### Ensuring No Residue Files
+
+The key challenge: if we set `old = None`, the `removed_children` logic won't work (nothing to compare against). We need a two-phase approach:
+
+1. **Phase 1**: Collect ALL existing paths from the old tree before syncback
+2. **Phase 2**: After computing new paths, remove any old paths that aren't in the new set
+
+This guarantees no orphaned files remain.
 
 ### Changes Required
 
 #### 1. Add CLI Flag (`[src/cli/syncback.rs](src/cli/syncback.rs)`)
 
-Add `--clean` flag to the command definition:
+Add `--incremental` flag (clean mode is now default):
 
 ```rust
-/// If provided, syncback will ignore existing file structure and create
+/// If provided, syncback will preserve existing file structure and middleware
-/// a fresh project layout. This ensures consistent output regardless of
+/// formats when possible. Without this flag, syncback creates a fresh project
-/// existing filesystem state.
+/// layout that exactly matches the input file.
-#[clap(long)]
+#[clap(long, short = 'n')]
-pub clean: bool,
+pub incremental: bool,
 ```
 
 #### 2. Pass Flag to `syncback_loop` (`[src/cli/syncback.rs](src/cli/syncback.rs)`)
 
-Modify the `syncback_loop` call to pass the clean flag:
-
 ```rust
 let snapshot = syncback_loop(
     session_old.vfs(),
     &mut dom_old,
     dom_new,
     session_old.root_project(),
-    self.clean,  // New parameter
+    self.incremental,  // false = clean mode (default)
 )?;
 ```
 
-#### 3. Modify `syncback_loop` (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
+#### 3. Modify `syncback_loop` Signature (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
-
-Update function signature and initial snapshot:
 
 ```rust
 pub fn syncback_loop(
@@ -92,67 +97,120 @@ pub fn syncback_loop(
     old_tree: &mut RojoTree,
     mut new_tree: WeakDom,
     project: &Project,
-    clean_mode: bool,  // New parameter
+    incremental: bool,  // false = clean mode (default)
 ) -> anyhow::Result<FsSnapshot>
 ```
 
-When `clean_mode` is true, set the initial `old` reference to `None`:
+#### 4. Collect Existing Paths Before Syncback (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
+
+Before the main loop, collect all existing filesystem paths (respecting ignore patterns):
+
+```rust
+// Collect all existing paths from old tree for cleanup in clean mode
+let existing_paths: HashSet<PathBuf> = if !incremental {
+    let mut paths = HashSet::new();
+    for ref_id in descendants(old_tree.inner(), old_tree.get_root_id()) {
+        if let Some(inst) = old_tree.get_instance(ref_id) {
+            for path in inst.metadata().relevant_paths.iter() {
+                // Skip paths matching ignore patterns
+                if is_valid_path(&ignore_patterns, project_path, path) {
+                    paths.insert(path.clone());
+                }
+            }
+        }
+    }
+    paths
+} else {
+    HashSet::new()
+};
+```
+
+#### 5. Set `old = None` in Clean Mode (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
 
 ```rust
 let mut snapshots = vec![SyncbackSnapshot {
     data: syncback_data,
-    old: if clean_mode { None } else { Some(old_tree.get_root_id()) },
+    old: if incremental { Some(old_tree.get_root_id()) } else { None },
     new: new_tree.root_ref(),
     path: project.file_location.clone(),
     middleware: Some(Middleware::Project),
 }];
 ```
 
-#### 4. Track Removed Files in Clean Mode (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
+#### 6. Remove Orphaned Files After Syncback (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
 
-In clean mode, we need to remove all existing files in the target paths. Add logic to collect existing paths for removal:
+After the main loop, remove any existing paths that weren't written to:
 
 ```rust
-if clean_mode {
+// In clean mode, remove any existing paths that weren't overwritten
-    // Collect all existing paths under the project tree for removal
+if !incremental {
-    for ref_id in descendants(old_tree.inner(), old_tree.get_root_id()) {
+    let added_paths: HashSet<&Path> = fs_snapshot.added_paths().iter().map(|p| p.as_path()).collect();
-        if let Some(inst) = old_tree.get_instance(ref_id) {
+    
-            for path in inst.metadata().relevant_paths.iter() {
+    for old_path in &existing_paths {
-                if path.is_dir() {
+        // Skip if this path (or a parent) is being written to
-                    fs_snapshot.remove_dir(path);
+        if added_paths.contains(old_path.as_path()) {
-                } else {
+            continue;
-                    fs_snapshot.remove_file(path);
+        }
-                }
+        // Skip if a parent directory is being added (the new structure will replace it)
-            }
+        if added_paths.iter().any(|p| old_path.starts_with(p)) {
+            continue;
+        }
+        
+        if old_path.is_dir() {
+            fs_snapshot.remove_dir(old_path);
+        } else {
+            fs_snapshot.remove_file(old_path);
         }
     }
 }
 ```
 
-#### 5. Update Child Snapshot Creation (`[src/snapshot_middleware/dir.rs](src/snapshot_middleware/dir.rs)`)
+#### 7. Skip Hash Comparison in Clean Mode (`[src/syncback/mod.rs](src/syncback/mod.rs)`)
 
-The `SyncbackSnapshot::with_joined_path` method already handles `old = None` correctly - it will create a fresh child snapshot without old references.
+The hash-based skipping should be disabled in clean mode since we want to rewrite everything:
+
+```rust
+// Skip hash comparison in clean mode - we want to rewrite everything
+if incremental {
+    if let Some(old_ref) = snapshot.old {
+        match (old_hashes.get(&old_ref), new_hashes.get(&snapshot.new)) {
+            (Some(old), Some(new)) => {
+                if old == new {
+                    log::trace!(
+                        "Skipping {inst_path} due to it being identically hashed as {old:?}"
+                    );
+                    continue;
+                }
+            }
+            _ => unreachable!("All Instances in both DOMs should have hashes"),
+        }
+    }
+}
+```
 
 ### Data Flow Diagram
 
 ```mermaid
 flowchart TD
-    subgraph currentBehavior [Current Behavior]
+    subgraph cleanMode [Default: Clean Mode]
-        A1[Syncback on Existing Files] --> B1{Old Instance Exists?}
+        A1[rojo syncback -i game.rbxl] --> B1[Collect existing paths]
-        B1 -->|Yes| C1[Preserve Filename]
+        B1 --> C1[Set old = None for all snapshots]
-        B1 -->|Yes| D1[Preserve Middleware]
+        C1 --> D1[Generate fresh filenames]
-        B1 -->|Yes| E1[Match Children by Name]
+        C1 --> E1[Choose best middleware]
-        C1 --> F1[Inconsistent Structure]
+        C1 --> F1[All children treated as new]
-        D1 --> F1
+        D1 --> G1[Compute new paths]
-        E1 --> F1
+        E1 --> G1
+        F1 --> G1
+        G1 --> H1[Remove orphaned files]
+        H1 --> I1[Consistent 1:1 Structure]
     end
     
-    subgraph cleanMode [Clean Mode]
+    subgraph incrementalMode [With --incremental Flag]
-        A2[Syncback with --clean] --> B2[Set old = None]
+        A2[rojo syncback -i game.rbxl --incremental] --> B2{Old Instance Exists?}
-        B2 --> C2[Generate Fresh Filename]
+        B2 -->|Yes| C2[Preserve Filename]
-        B2 --> D2[Choose Best Middleware]
+        B2 -->|Yes| D2[Preserve Middleware]
-        B2 --> E2[All Children Are New]
+        B2 -->|Yes| E2[Match Children by Name]
-        C2 --> F2[Consistent 1:1 Structure]
+        C2 --> F2[Legacy Behavior]
         D2 --> F2
         E2 --> F2
     end
@@ -163,16 +221,30 @@ flowchart TD
 ### Usage
 
 ```bash
-# Current behavior (preserves existing structure)
+# Default: Clean mode (creates fresh, consistent layout)
 rojo syncback -i game.rbxl
 
-# Destructive mode (ignores existing structure, creates fresh layout)
+# Preview what clean mode would do
-rojo syncback -i game.rbxl --clean
+rojo syncback -i game.rbxl --list --dry-run
 
-# Combine with other flags
+# Legacy behavior (preserves existing structure)
-rojo syncback -i game.rbxl --clean --list --dry-run
+rojo syncback -i game.rbxl --incremental
+rojo syncback -i game.rbxl -n
+
+# Combine flags
+rojo syncback -i game.rbxl --incremental --list
 ```
 
-### Alternative Consideration
+### Project-Level Configuration (Optional Enhancement)
 
-If you also want to support project-level configuration (so you don't need to pass `--clean` every time), we could add a `syncbackRules.cleanMode: true` option in the project file. Let me know if you'd prefer that approach.
+If you want to make incremental mode the default for a specific project without passing the flag, we could also add:
+
+```json5
+{
+  "syncbackRules": {
+    "incremental": true  // Opt into legacy behavior per-project
+  }
+}
+```
+
+This would be read in `syncback_loop` and combined with the CLI flag (CLI takes precedence).

.cursor/plans/syncback_auto-downloader_0508b4bb.plan.md

@@ -0,0 +1,276 @@
+---
+name: Syncback Auto-Downloader
+overview: Add an auto-download feature to the syncback command that fetches the .rbxl file from Roblox's asset delivery API, with sensible defaults to make `rojo syncback` work with zero arguments.
+todos:
+  - id: update-cargo
+    content: Add gzip/brotli/deflate features to reqwest, move tempfile to dependencies
+    status: completed
+  - id: download-function
+    content: Implement download_place() function with no-cache headers and cookie auth
+    status: completed
+  - id: update-args
+    content: "Update SyncbackCommand args: --download, new defaults, --interactive flip"
+    status: completed
+  - id: input-resolution
+    content: Implement input file resolution logic (download vs existing file)
+    status: completed
+  - id: sourcemap-gen
+    content: Add automatic sourcemap.json generation after syncback
+    status: completed
+  - id: git-refresh
+    content: Add git update-index --refresh for git repos
+    status: completed
+  - id: testing
+    content: Test the complete flow with various argument combinations
+    status: completed
+isProject: false
+---
+
+# Syncback Auto-Downloader Feature
+
+## Overview
+
+Enhance the `rojo syncback` command to automatically download place files from Roblox's asset delivery API, generate sourcemaps after completion, and refresh the git index. The goal is to make `rojo syncback` work with zero arguments.
+
+## Key Files to Modify
+
+- `[src/cli/syncback.rs](src/cli/syncback.rs)` - Main syncback command implementation
+- `[Cargo.toml](Cargo.toml)` - Add compression features to reqwest, move tempfile to dependencies
+
+## Implementation Details
+
+### 1. Update Dependencies in `Cargo.toml`
+
+```toml
+# Add compression features to reqwest
+reqwest = { version = "0.11.27", default-features = false, features = [
+    "blocking",
+    "json",
+    "rustls-tls",
+    "gzip",
+    "brotli",
+    "deflate",
+] }
+
+# Move tempfile from dev-dependencies to dependencies
+tempfile = "3.24.0"
+```
+
+### 2. Add Download Arguments to `SyncbackCommand`
+
+In `src/cli/syncback.rs`, modify the struct:
+
+```rust
+pub struct SyncbackCommand {
+    /// Path to the project to sync back to.
+    #[clap(default_value = "default.project.json5")]
+    pub project: PathBuf,
+
+    /// Path to the Roblox file to pull Instances from.
+    #[clap(long, short, default_value = "Project.rbxl")]
+    pub input: PathBuf,
+
+    /// Download the place file from Roblox. If no place ID is provided,
+    /// uses the first ID from servePlaceIds in the project file.
+    #[clap(long, short = 'd')]
+    pub download: Option<Option<u64>>,
+
+    /// Interactive mode - prompts before writing. Disabled by default.
+    #[clap(long, short = 'i')]
+    pub interactive: bool,
+    
+    // ... rest of existing fields
+}
+```
+
+Note: Flip `--non-interactive` to `--interactive` (new default is non-interactive).
+
+### 3. Download Function Implementation
+
+Create the download logic with these characteristics:
+
+- **URL**: `https://assetdelivery.roblox.com/v1/asset/?id={PLACEID}`
+- **Auth**: `ROBLOSECURITY` cookie from environment variable
+- **No-cache headers**:
+  - `Cache-Control: no-cache, no-store, must-revalidate`
+  - `Pragma: no-cache`
+  - `Expires: 0`
+- **Compression**: Request `Accept-Encoding: gzip, deflate, br` (reqwest handles decompression)
+- **Temp file**: Use `tempfile::NamedTempFile` with `.rbxl` extension, keep it alive during processing
+
+```rust
+fn download_place(place_id: u64) -> anyhow::Result<tempfile::NamedTempFile> {
+    let cookie = std::env::var("ROBLOSECURITY")
+        .context("ROBLOSECURITY environment variable not set")?;
+    
+    let url = format!("https://assetdelivery.roblox.com/v1/asset/?id={}", place_id);
+    
+    let client = reqwest::blocking::Client::builder()
+        .gzip(true)
+        .brotli(true)
+        .deflate(true)
+        .no_proxy()  // Avoid proxy caching
+        .build()?;
+    
+    let response = client
+        .get(&url)
+        .header(COOKIE, format!(".ROBLOSECURITY={}", cookie))
+        .header(CACHE_CONTROL, "no-cache, no-store, must-revalidate")
+        .header(PRAGMA, "no-cache")
+        .header("Expires", "0")
+        .header(USER_AGENT, "Rojo")
+        .send()?;
+    
+    // Create temp file with .rbxl extension
+    let mut temp_file = tempfile::Builder::new()
+        .suffix(".rbxl")
+        .tempfile()?;
+    
+    // Stream response to file
+    let bytes = response.bytes()?;
+    std::io::copy(&mut bytes.as_ref(), &mut temp_file)?;
+    
+    Ok(temp_file)
+}
+```
+
+### 4. Resolve Place ID Logic
+
+When `--download` is provided without a value:
+
+1. Load the project file first
+2. Extract `serve_place_ids` from the project
+3. Take the first place ID from the set (convert HashSet to Vec, sort for determinism, take first)
+4. Error if `servePlaceIds` is empty or not set
+
+### 5. Input File Resolution Logic
+
+In the `run()` method:
+
+```rust
+// Determine the actual input path
+let input_path = if let Some(download_opt) = &self.download {
+    // --download was specified
+    if !self.input_exists() || download_opt.is_some() {
+        // Download needed: either file doesn't exist or explicit place ID
+        let place_id = match download_opt {
+            Some(id) => *id,
+            None => {
+                // Load project to get servePlaceIds
+                let project = Project::load_fuzzy(&path_old)?;
+                project.serve_place_ids
+                    .as_ref()
+                    .and_then(|ids| ids.iter().min().copied())
+                    .context("No servePlaceIds in project and no place ID provided")?
+            }
+        };
+        
+        eprintln!("Downloading place {}...", place_id);
+        let temp_file = download_place(place_id)?;
+        // Keep temp_file alive during processing
+        DownloadedInput::Temp(temp_file)
+    } else {
+        DownloadedInput::Existing(resolve_path(&self.input).into_owned())
+    }
+} else if self.input.exists() {
+    DownloadedInput::Existing(resolve_path(&self.input).into_owned())
+} else {
+    anyhow::bail!("Input file {} not found. Use --download to fetch from Roblox.", self.input.display())
+};
+```
+
+### 6. Sourcemap Generation After Syncback
+
+After successful syncback, generate `sourcemap.json` in the project root:
+
+```rust
+// After snapshot.write_to_vfs()
+let sourcemap_path = session_old.root_project().folder_location().join("sourcemap.json");
+write_sourcemap(&session_old, Some(&sourcemap_path), filter_nothing, false)?;
+eprintln!("Generated sourcemap at {}", sourcemap_path.display());
+```
+
+This requires extracting or sharing the `write_sourcemap` function from `sourcemap.rs` (likely needs to be made `pub(crate)`).
+
+### 7. Git Index Refresh
+
+After syncback completes, check if in a git repo and refresh the index:
+
+```rust
+fn refresh_git_index(project_dir: &Path) {
+    // Check if .git exists in project dir or any parent
+    let mut check_dir = Some(project_dir);
+    let mut is_git_repo = false;
+    while let Some(dir) = check_dir {
+        if dir.join(".git").exists() {
+            is_git_repo = true;
+            break;
+        }
+        check_dir = dir.parent();
+    }
+    
+    if is_git_repo {
+        let result = std::process::Command::new("git")
+            .arg("update-index")
+            .arg("--refresh")
+            .current_dir(project_dir)
+            .stdout(std::process::Stdio::null())
+            .stderr(std::process::Stdio::null())
+            .status();
+        
+        if let Err(e) = result {
+            log::warn!("Failed to refresh git index: {}", e);
+        }
+    }
+}
+```
+
+### 8. Summary of Default Changes
+
+
+| Argument            | Old Default        | New Default                                                       |
+| ------------------- | ------------------ | ----------------------------------------------------------------- |
+| `project`           | `""` (current dir) | `default.project.json5`                                           |
+| `--input`           | Required           | `Project.rbxl`                                                    |
+| `--non-interactive` | `false`            | Removed, replaced with `--interactive` (default: non-interactive) |
+
+
+## Flow Diagram
+
+```mermaid
+flowchart TD
+    Start[rojo syncback] --> CheckDownload{--download flag?}
+    CheckDownload -->|No| CheckInput{Input file exists?}
+    CheckDownload -->|Yes| CheckPlaceId{Place ID provided?}
+    
+    CheckPlaceId -->|Yes| Download[Download from Roblox]
+    CheckPlaceId -->|No| LoadProject[Load project.json5]
+    LoadProject --> GetPlaceId[Get first servePlaceIds]
+    GetPlaceId --> Download
+    
+    Download --> TempFile[Save to temp file]
+    TempFile --> ProcessDom[Process DOM]
+    
+    CheckInput -->|Yes| UseExisting[Use existing file]
+    CheckInput -->|No| Error[Error: file not found]
+    
+    UseExisting --> ProcessDom
+    ProcessDom --> Syncback[Run syncback]
+    Syncback --> WriteFiles[Write to filesystem]
+    WriteFiles --> GenSourcemap[Generate sourcemap.json]
+    GenSourcemap --> GitRefresh[git update-index --refresh]
+    GitRefresh --> Cleanup[Cleanup temp file]
+    Cleanup --> End[Done]
+```
+
+
+
+## Edge Cases
+
+- If `--input` file exists and `--download` not specified: use existing file (no download)
+- If `--input` file exists but `--download <placeid>` explicitly given: download anyway (override)
+- If `--download` with no arg and no `servePlaceIds` in project: error with helpful message
+- If `ROBLOSECURITY` not in environment: error with helpful message
+- If download fails: error with status code and helpful message
+- If not a git repo: silently skip git refresh
+

Cargo.lock

@@ -39,12 +39,36 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "alloc-no-stdlib"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc7bb162ec39d46ab1ca8c77bf72e890535becd1751bb45f64c597edb4c8c6b3"
+
+[[package]]
+name = "alloc-stdlib"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94fb8275041c72129eb51b7d0322c29b8387a0386127718b096429201a5d6ece"
+dependencies = [
+ "alloc-no-stdlib",
+]
+
 [[package]]
 name = "anes"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4b46cbb362ab8752921c97e041f5e366ee6297bd428a31275b9fcf1e380f7299"
 
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
+dependencies = [
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.21"
@@ -113,12 +137,30 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "76a2e8124351fda1ef8aaaa3bbd7ebbcb486bbcd4225aca0aa0d84bb2db8fecb"
 
+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
 [[package]]
 name = "arrayvec"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
 
+[[package]]
+name = "async-compression"
+version = "0.4.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d10e4f991a553474232bc0a31799f6d24b034a84c0971d80d2e2f78b2e576e40"
+dependencies = [
+ "compression-codecs",
+ "compression-core",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -151,6 +193,18 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "base-x"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4cbbc9d0964165b47557570cce6c952866c2678457aca742aafc9fb771d30270"
+
+[[package]]
+name = "base64"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+
 [[package]]
 name = "base64"
 version = "0.21.7"
@@ -184,6 +238,17 @@ version = "2.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "812e12b5285cc515a9c72a5c1d3b6d46a19dac5acfef5265968c166106e31dd3"
 
+[[package]]
+name = "blake2b_simd"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afa748e348ad3be8263be728124b24a24f268266f6f5d58af9d75f6a40b5c587"
+dependencies = [
+ "arrayref",
+ "arrayvec 0.5.2",
+ "constant_time_eq 0.1.5",
+]
+
 [[package]]
 name = "blake3"
 version = "1.8.3"
@@ -191,10 +256,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2468ef7d57b3fb7e16b576e8377cdbde2320c60e1491e961d11da40fc4f02a2d"
 dependencies = [
  "arrayref",
- "arrayvec",
+ "arrayvec 0.7.6",
  "cc",
  "cfg-if 1.0.4",
- "constant_time_eq",
+ "constant_time_eq 0.4.2",
  "cpufeatures",
 ]
 
@@ -207,6 +272,27 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "brotli"
+version = "8.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bd8b9603c7aa97359dbd97ecf258968c95f3adddd6db2f7e7a5bef101c84560"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+ "brotli-decompressor",
+]
+
+[[package]]
+name = "brotli-decompressor"
+version = "5.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "874bb8112abecc98cbd6d81ea4fa7e94fb9449648c93cc89aa40c81c24d7de03"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+]
+
 [[package]]
 name = "bstr"
 version = "1.12.1"
@@ -224,6 +310,12 @@ version = "3.19.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5dd9dc738b7a8311c7ade152424974d8115f2cdad61e8dab8dac9f2362298510"
 
+[[package]]
+name = "byteorder"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fc10e8cc6b2580fda3f36eb6dc5316657f812a3df879a44a66fc9f0fdbc4855"
+
 [[package]]
 name = "byteorder"
 version = "1.5.0"
@@ -299,9 +391,13 @@ version = "2.34.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
 dependencies = [
+ "ansi_term",
+ "atty",
  "bitflags 1.3.2",
+ "strsim 0.8.0",
  "textwrap",
  "unicode-width",
+ "vec_map",
 ]
 
 [[package]]
@@ -323,7 +419,7 @@ dependencies = [
  "anstream",
  "anstyle",
  "clap_lex",
- "strsim",
+ "strsim 0.11.1",
 ]
 
 [[package]]
@@ -335,7 +431,7 @@ dependencies = [
  "heck",
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -350,6 +446,24 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "compression-codecs"
+version = "0.4.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00828ba6fd27b45a448e57dbfe84f1029d4c9f26b368157e9a448a5f49a2ec2a"
+dependencies = [
+ "brotli",
+ "compression-core",
+ "flate2",
+ "memchr",
+]
+
+[[package]]
+name = "compression-core"
+version = "0.4.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75984efb6ed102a0d42db99afb6c1948f0380d1d91808d5529916e6c08b49d8d"
+
 [[package]]
 name = "console"
 version = "0.15.11"
@@ -362,12 +476,34 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "const_fn"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f8a2ca5ac02d09563609681103aada9e1777d54fc57a5acd7a41404f9c93b6e"
+
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
+
 [[package]]
 name = "constant_time_eq"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d52eff69cd5e647efe296129160853a42795992097e8af39800e1060caeea9b"
 
+[[package]]
+name = "cookie"
+version = "0.15.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc6e25dfc584d06a3dbf775d207ff00d7de98d824c952dd2233dfbb261889a42"
+dependencies = [
+ "time 0.2.27",
+ "version_check",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.4"
@@ -393,6 +529,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "crc32fast"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9481c1c90cbf2ac953f07c8d4a58aa3945c425b7185c9154d67a65e4230da511"
+dependencies = [
+ "cfg-if 1.0.4",
+]
+
 [[package]]
 name = "criterion"
 version = "0.3.6"
@@ -542,6 +687,15 @@ version = "2.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d7a1e2f27636f116493b8b860f5546edb47c8d8f8ea73e1d2a20be88e28d1fea"
 
+[[package]]
+name = "deranged"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ececcb659e7ba858fb4f10388c250a7252eb0a27373f1a72b8748afdd248e587"
+dependencies = [
+ "powerfmt",
+]
+
 [[package]]
 name = "diff"
 version = "0.1.13"
@@ -558,6 +712,17 @@ dependencies = [
  "crypto-common",
 ]
 
+[[package]]
+name = "dirs"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fd78930633bd1c6e35c4b42b1df7b0cbc6bc191146e512bb3bedf243fcc3901"
+dependencies = [
+ "libc",
+ "redox_users 0.3.5",
+ "winapi 0.3.9",
+]
+
 [[package]]
 name = "dirs"
 version = "2.0.2"
@@ -584,7 +749,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b1d1d91c932ef41c0f2663aa8b0ca0342d444d842c06914aa0a7e352d0bada6"
 dependencies = [
  "libc",
- "redox_users",
+ "redox_users 0.4.6",
  "winapi 0.3.9",
 ]
 
@@ -596,10 +761,16 @@ checksum = "520f05a5cbd335fae5a99ff7a6ab8627577660ee5cfd6a94a6a929b52ff0321c"
 dependencies = [
  "libc",
  "option-ext",
- "redox_users",
+ "redox_users 0.4.6",
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "discard"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "212d0f5754cb6769937f4501cc0e67f4f4483c8d2c3e1e922ee9edbe4ab4c7c0"
+
 [[package]]
 name = "displaydoc"
 version = "0.2.5"
@@ -608,7 +779,7 @@ checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -624,7 +795,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e62abb876c07e4754fae5c14cafa77937841f01740637e17d78dc04352f32a5e"
 dependencies = [
  "cc",
- "rustc_version",
+ "rustc_version 0.4.1",
  "toml 0.5.11",
  "vswhom",
  "winreg 0.10.1",
@@ -655,6 +826,19 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "env_logger"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a12e6657c4c97ebab115a42dcee77225f7f482cdd841cf7088c657a42e9e00e7"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "env_logger"
 version = "0.11.8"
@@ -707,6 +891,16 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
+[[package]]
+name = "flate2"
+version = "1.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b375d6465b98090a5f25b1c7703f3859783755aa9a80433b36e0379a3ec2f369"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "float-cmp"
 version = "0.9.0"
@@ -837,7 +1031,7 @@ checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -895,6 +1089,17 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
+dependencies = [
+ "cfg-if 1.0.4",
+ "libc",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.17"
@@ -903,7 +1108,7 @@ checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
 dependencies = [
  "cfg-if 1.0.4",
  "libc",
- "wasi",
+ "wasi 0.11.1+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -1348,7 +1553,7 @@ checksum = "e0c84ee7f197eca9a86c6fd6cb771e55eb991632f15f2bc3ca6ec838929e6e78"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -1527,6 +1732,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fa76a2c86f704bdb222d66965fb3d63269ce38518b83cb0575fca855ebb6316"
 dependencies = [
  "adler2",
+ "simd-adler32",
 ]
 
 [[package]]
@@ -1555,7 +1761,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a69bcab0ad47271a0234d9422b131806bf3968021e5dc9328caf2d4cd58557fc"
 dependencies = [
  "libc",
- "wasi",
+ "wasi 0.11.1+wasi-snapshot-preview1",
  "windows-sys 0.61.2",
 ]
 
@@ -1621,6 +1827,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "num-conv"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf97ec579c3c42f953ef76dbf8d55ac91fb219dde70e49aa4a6b7d74e9919050"
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -1748,7 +1960,7 @@ dependencies = [
  "pest_meta",
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -1779,6 +1991,19 @@ version = "0.3.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7edddbd0b52d732b21ad9a5fab5c704c14cd949e5e9a1ec5929a24fded1b904c"
 
+[[package]]
+name = "plist"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "740ebea15c5d1428f910cd1a5f52cebf8d25006245ed8ade92702f4943d91e07"
+dependencies = [
+ "base64 0.22.1",
+ "indexmap 2.13.0",
+ "quick-xml",
+ "serde",
+ "time 0.3.46",
+]
+
 [[package]]
 name = "plotters"
 version = "0.3.7"
@@ -1831,6 +2056,12 @@ dependencies = [
  "zerovec",
 ]
 
+[[package]]
+name = "powerfmt"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.21"
@@ -1897,7 +2128,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "52717f9a02b6965224f95ca2a81e2e0c5c43baacd28ca057577988930b6c3d5b"
 dependencies = [
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
+]
+
+[[package]]
+name = "quick-xml"
+version = "0.38.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b66c2058c55a409d601666cffe35f04333cf1013010882cec174a7467cd4e21c"
+dependencies = [
+ "memchr",
 ]
 
 [[package]]
@@ -1980,7 +2220,7 @@ version = "2.0.1"
 dependencies = [
  "ahash",
  "criterion 0.5.1",
- "env_logger",
+ "env_logger 0.11.8",
  "heck",
  "insta",
  "log",
@@ -1994,6 +2234,23 @@ dependencies = [
  "zstd",
 ]
 
+[[package]]
+name = "rbx_cookie"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62d81c3d7cd53ac75f48a7b526e145d0b72c19d695364edb343e9248192d3f17"
+dependencies = [
+ "byteorder 0.5.3",
+ "clap 2.34.0",
+ "cookie",
+ "dirs 1.0.5",
+ "env_logger 0.9.3",
+ "log",
+ "plist",
+ "winapi 0.3.9",
+ "winreg 0.10.1",
+]
+
 [[package]]
 name = "rbx_dom_weak"
 version = "4.1.0"
@@ -2047,7 +2304,7 @@ version = "2.0.1"
 dependencies = [
  "ahash",
  "base64 0.22.1",
- "env_logger",
+ "env_logger 0.11.8",
  "heck",
  "insta",
  "log",
@@ -2057,6 +2314,12 @@ dependencies = [
  "xml-rs",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.1.57"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"
+
 [[package]]
 name = "redox_syscall"
 version = "0.5.18"
@@ -2075,6 +2338,17 @@ dependencies = [
  "bitflags 2.10.0",
 ]
 
+[[package]]
+name = "redox_users"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de0737333e7a9502c789a36d7c7fa6092a49895d4faa31ca5df163857ded2e9d"
+dependencies = [
+ "getrandom 0.1.16",
+ "redox_syscall 0.1.57",
+ "rust-argon2",
+]
+
 [[package]]
 name = "redox_users"
 version = "0.4.6"
@@ -2121,6 +2395,7 @@ version = "0.11.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd67538700a17451e7cba03ac727fb961abb7607553461627b97de0b89cf4a62"
 dependencies = [
+ "async-compression",
  "base64 0.21.7",
  "bytes",
  "encoding_rs",
@@ -2147,6 +2422,7 @@ dependencies = [
  "system-configuration",
  "tokio",
  "tokio-rustls",
+ "tokio-util",
  "tower-service",
  "url",
  "wasm-bindgen",
@@ -2238,7 +2514,7 @@ dependencies = [
  "csv",
  "data-encoding",
  "embed-resource",
- "env_logger",
+ "env_logger 0.11.8",
  "float-cmp",
  "fs-err",
  "futures",
@@ -2260,6 +2536,7 @@ dependencies = [
  "profiling",
  "rayon",
  "rbx_binary",
+ "rbx_cookie",
  "rbx_dom_weak",
  "rbx_reflection",
  "rbx_reflection_database",
@@ -2270,7 +2547,7 @@ dependencies = [
  "rmp-serde",
  "roblox_install",
  "rojo-insta-ext",
- "semver",
+ "semver 1.0.27",
  "serde",
  "serde_bytes",
  "serde_json",
@@ -2295,19 +2572,40 @@ dependencies = [
  "serde_yaml",
 ]
 
+[[package]]
+name = "rust-argon2"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b18820d944b33caa75a71378964ac46f58517c92b6ae5f762636247c09e78fb"
+dependencies = [
+ "base64 0.13.1",
+ "blake2b_simd",
+ "constant_time_eq 0.1.5",
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b50b8869d9fc858ce7266cce0194bd74df58b9d0e3f6df3a9fc8eb470d95c09d"
 
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
+dependencies = [
+ "semver 0.9.0",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
 dependencies = [
- "semver",
+ "semver 1.0.27",
 ]
 
 [[package]]
@@ -2397,12 +2695,27 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+dependencies = [
+ "semver-parser",
+]
+
 [[package]]
 name = "semver"
 version = "1.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d767eb0aabc880b29956c35734170f26ed551a859dbd361d140cdbeca61ab1e2"
 
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+
 [[package]]
 name = "serde"
 version = "1.0.228"
@@ -2450,7 +2763,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -2499,6 +2812,15 @@ dependencies = [
  "yaml-rust",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1da05c97445caa12d05e848c4a4fcbbea29e748ac28f7e80e9b010392063770"
+dependencies = [
+ "sha1_smol",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.6"
@@ -2510,6 +2832,12 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "sha1_smol"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbfa15b3dddfee50a0fff136974b3e1bde555604ba463834a7eb7deb6417705d"
+
 [[package]]
 name = "sha2"
 version = "0.10.9"
@@ -2536,6 +2864,12 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
+[[package]]
+name = "simd-adler32"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e320a6c5ad31d271ad523dcf3ad13e2767ad8b1cb8f047f75a8aeaf8da139da2"
+
 [[package]]
 name = "similar"
 version = "2.7.0"
@@ -2589,6 +2923,70 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
+[[package]]
+name = "standback"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e113fb6f3de07a243d434a56ec6f186dfd51cb08448239fe7bcae73f87ff28ff"
+dependencies = [
+ "version_check",
+]
+
+[[package]]
+name = "stdweb"
+version = "0.4.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d022496b16281348b52d0e30ae99e01a73d737b2f45d38fed4edf79f9325a1d5"
+dependencies = [
+ "discard",
+ "rustc_version 0.2.3",
+ "stdweb-derive",
+ "stdweb-internal-macros",
+ "stdweb-internal-runtime",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "stdweb-derive"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c87a60a40fccc84bef0652345bbbbbe20a605bf5d0ce81719fc476f5c03b50ef"
+dependencies = [
+ "proc-macro2 1.0.106",
+ "quote 1.0.44",
+ "serde",
+ "serde_derive",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "stdweb-internal-macros"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58fa5ff6ad0d98d1ffa8cb115892b6e69d67799f6763e162a1c9db421dc22e11"
+dependencies = [
+ "base-x",
+ "proc-macro2 1.0.106",
+ "quote 1.0.44",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "sha1 0.6.1",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "stdweb-internal-runtime"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "213701ba3370744dcd1a12960caa4843b3d68b4d1c0a5d575e0d65b2ee9d16c0"
+
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -2613,7 +3011,18 @@ dependencies = [
  "heck",
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2 1.0.106",
+ "quote 1.0.44",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -2641,7 +3050,7 @@ checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -2722,7 +3131,7 @@ checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -2733,7 +3142,7 @@ checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -2745,6 +3154,75 @@ dependencies = [
  "cfg-if 1.0.4",
 ]
 
+[[package]]
+name = "time"
+version = "0.2.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4752a97f8eebd6854ff91f1c1824cd6160626ac4bd44287f7f4ea2035a02a242"
+dependencies = [
+ "const_fn",
+ "libc",
+ "standback",
+ "stdweb",
+ "time-macros 0.1.1",
+ "version_check",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "time"
+version = "0.3.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9da98b7d9b7dad93488a84b8248efc35352b0b2657397d4167e7ad67e5d535e5"
+dependencies = [
+ "deranged",
+ "itoa",
+ "num-conv",
+ "powerfmt",
+ "serde_core",
+ "time-core",
+ "time-macros 0.2.26",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7694e1cfe791f8d31026952abf09c69ca6f6fa4e1a1229e18988f06a04a12dca"
+
+[[package]]
+name = "time-macros"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "957e9c6e26f12cb6d0dd7fc776bb67a706312e7299aed74c8dd5b17ebb27e2f1"
+dependencies = [
+ "proc-macro-hack",
+ "time-macros-impl",
+]
+
+[[package]]
+name = "time-macros"
+version = "0.2.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78cc610bac2dcee56805c99642447d4c5dbde4d01f752ffea0199aee1f601dc4"
+dependencies = [
+ "num-conv",
+ "time-core",
+]
+
+[[package]]
+name = "time-macros-impl"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd3c141a1b43194f3f56a1411225df8646c55781d5f26db825b3d98507eb482f"
+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2 1.0.106",
+ "quote 1.0.44",
+ "standback",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "tinystr"
 version = "0.8.2"
@@ -2788,7 +3266,7 @@ checksum = "af407857209536a95c8e56f8231ef2c2e2aff839b22e07a1ffcbc617e9db9fa5"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -2964,14 +3442,14 @@ version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e3dac10fd62eaf6617d3a904ae222845979aec67c615d1c842b4002c7666fb9"
 dependencies = [
- "byteorder",
+ "byteorder 1.5.0",
  "bytes",
  "data-encoding",
  "http",
  "httparse",
  "log",
  "rand",
- "sha1",
+ "sha1 0.10.6",
  "thiserror 1.0.69",
  "url",
  "utf-8",
@@ -3038,7 +3516,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "18b19e258aa08450f93369cf56dd78063586adf19e92a75b338a800f799a0208"
 dependencies = [
  "ahash",
- "byteorder",
+ "byteorder 1.5.0",
  "lazy_static",
  "parking_lot",
  "serde",
@@ -3080,6 +3558,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba73ea9cf16a25df0c8caa16c51acb937d5712a8429db78a3ee29d5dcacd3a65"
 
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "version_check"
 version = "0.9.5"
@@ -3125,6 +3609,12 @@ dependencies = [
  "try-lock",
 ]
 
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
 [[package]]
 name = "wasi"
 version = "0.11.1+wasi-snapshot-preview1"
@@ -3186,7 +3676,7 @@ dependencies = [
  "bumpalo",
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
  "wasm-bindgen-shared",
 ]
 
@@ -3614,7 +4104,7 @@ checksum = "b659052874eb698efe5b9e8cf382204678a0086ebf46982b79d6ca3182927e5d"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
  "synstructure",
 ]
 
@@ -3635,7 +4125,7 @@ checksum = "1328722bbf2115db7e19d69ebcc15e795719e2d66b60827c6a69a117365e37a0"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -3655,7 +4145,7 @@ checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
  "synstructure",
 ]
 
@@ -3689,7 +4179,7 @@ checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
 dependencies = [
  "proc-macro2 1.0.106",
  "quote 1.0.44",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]

Cargo.toml

@@ -72,11 +72,16 @@ log = "0.4.29"
 num_cpus = "1.17.0"
 opener = "0.5.2"
 rayon = "1.11.0"
+rbx_cookie = "0.1.5"
 reqwest = { version = "0.11.27", default-features = false, features = [
     "blocking",
     "json",
     "rustls-tls",
+    "gzip",
+    "brotli",
+    "deflate",
 ] }
+tempfile = "3.24.0"
 ritz = "0.1.0"
 roblox_install = "1.0.0"
 serde = { version = "1.0.228", features = ["derive", "rc"] }
@@ -121,5 +126,4 @@ paste = "1.0.15"
 pretty_assertions = "1.4.1"
 regex = "1"
 serde_yaml = "0.8.26"
-tempfile = "3.24.0"
 walkdir = "2.5.0"

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__child_but_not-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing OnlyOneCopy/child_of_one.luau
 Writing ReplicatedStorage/child_replicated_storage.luau
+Created sourcemap at <TEMP>/child_but_not\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__csv-stdout.snap

@@ -1,7 +1,8 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/csv.csv
 Writing src/csv_init/init.csv
 Writing src/csv_init
+Created sourcemap at <TEMP>/csv\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__duplicate_rojo_id-stdout.snap

@@ -1,5 +1,6 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing container.model.json5
+Created sourcemap at <TEMP>/duplicate_rojo_id\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ignore_paths_adding-stdout.snap

@@ -1,8 +1,9 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/ignored_part.model.json5
 Writing src/int_value.model.json5
 Writing src/subfolder/string_value.txt
 Writing src/subfolder
+Created sourcemap at <TEMP>/ignore_paths_adding\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ignore_paths_init-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/non-init.luau
 Writing src/init-file
+Created sourcemap at <TEMP>/ignore_paths_init\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ignore_paths_removing-stdout.snap

@@ -1,5 +1,6 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/Message.model.json5
+Created sourcemap at <TEMP>/ignore_paths_removing\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ignore_trees_adding-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/IncludeMe/.gitkeep
 Writing src/IncludeMe
+Created sourcemap at <TEMP>/ignore_trees_adding\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ignore_trees_removing-stdout.snap

@@ -3,3 +3,4 @@ source: tests/rojo_test/syncback_util.rs
 expression: normalized_stdout
 ---
 Removing src
+Created sourcemap at <TEMP>/ignore_trees_removing\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__json_middlewares-stdout.snap

@@ -1,8 +1,9 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/dir_with_meta/init.meta.json5
 Writing src/model_json.model.json5
 Writing src/project_json.project.json5
 Writing src/dir_with_meta
+Created sourcemap at <TEMP>/json_middlewares\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__nested_projects-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing nested.project.json5
 Writing string_value.txt
+Created sourcemap at <TEMP>/nested_projects\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__nested_projects_weird-stdout.snap

@@ -6,3 +6,4 @@ Writing src/modules/ClientModule.luau
 Writing src/modules/ServerModule.luau
 Removing client-only.project.json5
 Removing server-only.project.json5
+Created sourcemap at <TEMP>/nested_projects_weird\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__project_init-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/init.luau
 Writing src
+Created sourcemap at <TEMP>/project_init\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__project_reserialize-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing attribute_mismatch.luau
 Writing property_mismatch.project.json5
+Created sourcemap at <TEMP>/project_reserialize\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__rbxm_fallback-stdout.snap

@@ -1,8 +1,9 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/ChildWithoutDuplicates/Child/.gitkeep
 Writing src/ChildWithDuplicates
 Writing src/ChildWithoutDuplicates
 Writing src/ChildWithoutDuplicates/Child
+Created sourcemap at <TEMP>/rbxm_fallback\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ref_properties-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/pointer.model.json5
 Writing src/target.model.json5
+Created sourcemap at <TEMP>/ref_properties\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ref_properties_blank-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/pointer.model.json5
 Writing src/target.txt
+Created sourcemap at <TEMP>/ref_properties_blank\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ref_properties_conflict-stdout.snap

@@ -1,8 +1,9 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/Pointer_1.model.json5
 Writing src/Pointer_2.model.json5
 Writing src/Target_1.model.json5
 Writing src/Target_2.model.json5
+Created sourcemap at <TEMP>/ref_properties_conflict\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ref_properties_duplicate-stdout.snap

@@ -7,3 +7,4 @@ Writing src/Pointer_2.model.json5
 Writing src/Target/init.meta.json5
 Writing src/Target
 Removing src/Target.model.json5
+Created sourcemap at <TEMP>/ref_properties_duplicate\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__ref_properties_pruned-stdout.snap

@@ -1,7 +1,8 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/Pointer1.model.json5
 Writing src/Pointer2.model.json5
 Writing src/Pointer3.model.json5
+Created sourcemap at <TEMP>/ref_properties_pruned\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__respect_old_middleware-stdout.snap

@@ -1,8 +1,9 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing default.project.json5
 Writing src/model_json.model.json5
 Writing src/rbxm.rbxm
 Writing src/rbxmx.rbxmx
+Created sourcemap at <TEMP>/respect_old_middleware\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__schema_roundtrip-stdout.snap

@@ -1,6 +1,6 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing default.project.json5
 Writing src/adjacent.luau
@@ -8,3 +8,4 @@ Writing src/adjacent.meta.json5
 Writing src/init/init.meta.json5
 Writing src/model.model.json5
 Writing src/init
+Created sourcemap at <TEMP>/schema_roundtrip\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__string_value_project-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing default.project.json5
 Writing string_value.txt
+Created sourcemap at <TEMP>/string_value_project\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__sync_rules-stdout.snap

@@ -1,6 +1,7 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing src/module.modulescript
 Writing src/text.text
+Created sourcemap at <TEMP>/sync_rules\sourcemap.json

rojo-test/syncback-test-snapshots/end_to_end__rojo_test__syncback_util__unscriptable_properties-stdout.snap

@@ -1,5 +1,6 @@
 ---
 source: tests/rojo_test/syncback_util.rs
-expression: "String::from_utf8_lossy(&output.stdout)"
+expression: normalized_stdout
 ---
 Writing default.project.json5
+Created sourcemap at <TEMP>/unscriptable_properties\sourcemap.json

src/cli/sourcemap.rs

@@ -115,7 +115,7 @@ impl SourcemapCommand {
     }
 }
 
-fn filter_nothing(_instance: &InstanceWithMeta) -> bool {
+pub(crate) fn filter_nothing(_instance: &InstanceWithMeta) -> bool {
     true
 }
 
@@ -229,7 +229,7 @@ fn recurse_create_node<'a>(
     })
 }
 
-fn write_sourcemap(
+pub(crate) fn write_sourcemap(
     session: &ServeSession,
     output: Option<&Path>,
     filter: fn(&InstanceWithMeta) -> bool,

src/cli/syncback.rs

@@ -2,23 +2,31 @@ use std::{
     io::{self, BufReader, Write as _},
     mem::forget,
     path::{Path, PathBuf},
+    process::{Command, Stdio},
     time::Instant,
 };
 
-use anyhow::Context;
+use anyhow::{bail, Context};
 use clap::Parser;
 use fs_err::File;
 use memofs::Vfs;
 use rbx_dom_weak::{InstanceBuilder, WeakDom};
+use reqwest::header::{CACHE_CONTROL, COOKIE, PRAGMA, USER_AGENT};
+use tempfile::NamedTempFile;
 use termcolor::{BufferWriter, Color, ColorChoice, ColorSpec, WriteColor};
 
 use crate::{
     path_serializer::display_absolute,
+    project::Project,
     serve_session::ServeSession,
     syncback::{syncback_loop, FsSnapshot},
 };
 
-use super::{resolve_path, GlobalOptions};
+use super::{
+    resolve_path,
+    sourcemap::{filter_nothing, write_sourcemap},
+    GlobalOptions,
+};
 
 const UNKNOWN_INPUT_KIND_ERR: &str = "Could not detect what kind of file was inputted. \
                                        Expected input file to end in .rbxl, .rbxlx, .rbxm, or .rbxmx.";
@@ -34,16 +42,21 @@ const UNKNOWN_INPUT_KIND_ERR: &str = "Could not detect what kind of file was inp
 #[derive(Debug, Parser)]
 pub struct SyncbackCommand {
     /// Path to the project to sync back to.
-    #[clap(default_value = "")]
+    #[clap(default_value = "default.project.json5")]
     pub project: PathBuf,
 
     /// Path to the Roblox file to pull Instances from.
-    #[clap(long, short)]
+    #[clap(long, short = 'f', default_value = "Project.rbxl")]
     pub input: PathBuf,
 
+    /// Download the place file from Roblox with the specified place ID,
+    /// ignoring any existing input file.
+    #[clap(long, short = 'd')]
+    pub download: Option<u64>,
+
     /// If provided, a list all of the files and directories that will be
     /// added or removed is emitted into stdout.
-    #[clap(long, short)]
+    #[clap(long, short = 'l')]
     pub list: bool,
 
     /// If provided, syncback will not actually write anything to the file
@@ -51,9 +64,10 @@ pub struct SyncbackCommand {
     #[clap(long)]
     pub dry_run: bool,
 
-    /// If provided, the prompt for writing to the file system is skipped.
+    /// If provided, prompts before writing to the file system.
-    #[clap(long, short = 'y')]
+    /// By default, syncback runs non-interactively.
-    pub non_interactive: bool,
+    #[clap(long, short = 'i')]
+    pub interactive: bool,
 
     /// If provided, syncback will preserve existing file structure and middleware
     /// formats when possible. Without this flag (default), syncback creates a fresh
@@ -65,7 +79,53 @@ pub struct SyncbackCommand {
 impl SyncbackCommand {
     pub fn run(&self, global: GlobalOptions) -> anyhow::Result<()> {
         let path_old = resolve_path(&self.project);
-        let path_new = resolve_path(&self.input);
+
+        // Determine if we need to download the input file
+        let resolved_input = resolve_path(&self.input);
+        let _temp_file: Option<NamedTempFile>;
+
+        // Logic:
+        // - If --download=PLACEID: always download that specific place
+        // - If input file exists: use it
+        // - If input file doesn't exist: auto-download using servePlaceIds
+        let path_new = match &self.download {
+            Some(place_id) => {
+                // --download=PLACEID: always download this specific place
+                eprintln!("Downloading place {}...", place_id);
+                let download_timer = Instant::now();
+                let temp = download_place(*place_id)?;
+                eprintln!(
+                    "Downloaded in {:.02}s",
+                    download_timer.elapsed().as_secs_f32()
+                );
+                let temp_path = temp.path().to_path_buf();
+                _temp_file = Some(temp);
+                temp_path
+            }
+            None if resolved_input.exists() => {
+                // No --download flag, input file exists: use it
+                _temp_file = None;
+                resolved_input.into_owned()
+            }
+            None => {
+                // No --download flag, input file doesn't exist: auto-download
+                let place_id = get_place_id_from_project(&path_old)?;
+                eprintln!(
+                    "Input file '{}' not found, downloading place {}...",
+                    resolved_input.display(),
+                    place_id
+                );
+                let download_timer = Instant::now();
+                let temp = download_place(place_id)?;
+                eprintln!(
+                    "Downloaded in {:.02}s",
+                    download_timer.elapsed().as_secs_f32()
+                );
+                let temp_path = temp.path().to_path_buf();
+                _temp_file = Some(temp);
+                temp_path
+            }
+        };
 
         let input_kind = FileKind::from_path(&path_new).context(UNKNOWN_INPUT_KIND_ERR)?;
         let dom_start_timer = Instant::now();
@@ -127,8 +187,12 @@ impl SyncbackCommand {
             list_files(&snapshot, global.color.into(), base_path)?;
         }
 
+        // Drop dom_old early to release the mutex - we don't need it anymore
+        // and write_sourcemap needs to acquire the same lock
+        drop(dom_old);
+
         if !self.dry_run {
-            if !self.non_interactive {
+            if self.interactive {
                 eprintln!(
                     "Would write {} files/folders and remove {} files/folders.",
                     snapshot.added_paths().len(),
@@ -146,7 +210,14 @@ impl SyncbackCommand {
             }
             eprintln!("Writing to the file system...");
             snapshot.write_to_vfs(base_path, session_old.vfs())?;
-            eprintln!("Finished syncback.")
+            eprintln!("Finished syncback.");
+
+            // Generate sourcemap after successful syncback
+            let sourcemap_path = base_path.join("sourcemap.json");
+            write_sourcemap(&session_old, Some(&sourcemap_path), filter_nothing, false)?;
+
+            // Refresh git index if in a git repository
+            refresh_git_index(base_path);
         } else {
             eprintln!(
                 "Would write {} files/folders and remove {} files/folders.",
@@ -159,13 +230,124 @@ impl SyncbackCommand {
         // It is potentially prohibitively expensive to drop a ServeSession,
         // and the program is about to exit anyway so we're just going to forget
         // about it.
-        drop(dom_old);
         forget(session_old);
 
+        // Temp file is automatically cleaned up when _temp_file is dropped
+
         Ok(())
     }
 }
 
+/// Gets the first place ID from the project's servePlaceIds field.
+fn get_place_id_from_project(project_path: &Path) -> anyhow::Result<u64> {
+    // Use oneshot Vfs to avoid file watching issues
+    let temp_vfs = Vfs::new_oneshot();
+    let project =
+        Project::load_fuzzy(&temp_vfs, project_path)?.context("Could not find project file")?;
+    let serve_place_ids = project.serve_place_ids.as_ref().context(
+        "No servePlaceIds in project file. Add servePlaceIds to your project or use --download=PLACEID",
+    )?;
+    // Get the smallest ID for deterministic behavior
+    serve_place_ids
+        .iter()
+        .min()
+        .copied()
+        .context("servePlaceIds is empty in project file")
+}
+
+/// Downloads a place file from Roblox's asset delivery API.
+///
+/// Uses rbx_cookie to get the authentication cookie from the system.
+fn download_place(place_id: u64) -> anyhow::Result<NamedTempFile> {
+    let cookie = rbx_cookie::get_value()
+        .context("Could not find Roblox authentication cookie. Please log into Roblox Studio.")?;
+
+    let url = format!("https://assetdelivery.roblox.com/v1/asset/?id={}", place_id);
+
+    let client = reqwest::blocking::Client::builder()
+        .gzip(true)
+        .brotli(true)
+        .deflate(true)
+        .build()?;
+
+    let response = client
+        .get(&url)
+        .header(COOKIE, format!(".ROBLOSECURITY={}", cookie))
+        .header(CACHE_CONTROL, "no-cache, no-store, must-revalidate")
+        .header(PRAGMA, "no-cache")
+        .header("Expires", "0")
+        .header(USER_AGENT, "Rojo")
+        .send()?;
+
+    let status = response.status();
+    if !status.is_success() {
+        bail!(
+            "Failed to download place {}: HTTP {} - {}",
+            place_id,
+            status,
+            response.text().unwrap_or_default()
+        );
+    }
+
+    // Create temp file with .rbxl extension
+    let mut temp_file = tempfile::Builder::new()
+        .prefix("rojo-syncback-")
+        .suffix(".rbxl")
+        .tempfile()
+        .context("Failed to create temporary file")?;
+
+    // Write response body to temp file
+    let bytes = response.bytes()?;
+    io::copy(&mut bytes.as_ref(), &mut temp_file)?;
+    temp_file.flush()?;
+
+    log::debug!(
+        "Downloaded {} bytes to {}",
+        bytes.len(),
+        temp_file.path().display()
+    );
+
+    Ok(temp_file)
+}
+
+/// Refreshes the git index if the project is in a git repository.
+///
+/// This is useful because syncback may rewrite files with identical content,
+/// which can cause git to report them as modified due to timestamp changes.
+fn refresh_git_index(project_dir: &Path) {
+    // Check if .git exists in project dir or any parent
+    let mut check_dir = Some(project_dir);
+    let mut is_git_repo = false;
+    while let Some(dir) = check_dir {
+        if dir.join(".git").exists() {
+            is_git_repo = true;
+            break;
+        }
+        check_dir = dir.parent();
+    }
+
+    if is_git_repo {
+        log::debug!("Refreshing git index...");
+        let result = Command::new("git")
+            .args(["update-index", "--refresh"])
+            .current_dir(project_dir)
+            .stdout(Stdio::null())
+            .stderr(Stdio::null())
+            .status();
+
+        match result {
+            Ok(status) => {
+                if !status.success() {
+                    log::debug!("git update-index --refresh exited with: {}", status);
+                }
+            }
+            Err(e) => {
+                log::warn!("Failed to run git update-index --refresh: {}", e);
+            }
+        }
+    }
+}
+
 fn read_dom(path: &Path, file_kind: FileKind) -> anyhow::Result<WeakDom> {
     let content = BufReader::new(File::open(path)?);
     match file_kind {

tests/rojo_test/syncback_util.rs

@@ -75,7 +75,6 @@ fn run_syncback_test_impl(name: &str, incremental: bool, callback: impl FnOnce(&
         project_path.to_str().unwrap(),
         "--input",
         input_file.to_str().unwrap(),
-        "--non-interactive",
         "--list",
     ];
 
@@ -118,11 +117,20 @@ fn run_syncback_test_impl(name: &str, incremental: bool, callback: impl FnOnce(&
 
     // Normalize temp directory paths in the output to make snapshots deterministic.
     // Paths like "C:/Users/Joe/AppData/Local/Temp/.tmpXXXXXX/test_name/..."
+    // or "\\?\C:\Users\Joe\AppData\Local\Temp\.tmpXXXXXX\test_name\..."
     // become "<TEMP>/test_name/..."
     let stdout = String::from_utf8_lossy(&output.stdout);
+
+    // Handle forward slash paths (Unix-style)
     let temp_path_regex = Regex::new(r"[A-Za-z]:/[^\s]*/\.tmp[^/]*/").expect("Invalid regex");
     let normalized_stdout = temp_path_regex.replace_all(&stdout, "<TEMP>/");
 
+    // Handle backslash paths with optional UNC prefix (Windows-style)
+    // Matches: \\?\C:\...\temp dir\  or C:\...\temp dir\
+    let windows_temp_regex =
+        Regex::new(r"(?:\\\\?\?\\)?[A-Za-z]:\\[^\s]*\\\.tmp[^\\]*\\").expect("Invalid regex");
+    let normalized_stdout = windows_temp_regex.replace_all(&normalized_stdout, "<TEMP>/");
+
     settings.bind(|| assert_snapshot!(format!("{name}-stdout"), normalized_stdout));
 
     settings.bind(|| callback(project_path.as_path()))

tests/tests/clean_mode.rs

@@ -24,7 +24,6 @@ fn run_syncback(project_path: &Path, input_path: &Path, incremental: bool) -> bo
         project_path.to_str().unwrap(),
         "--input",
         input_path.to_str().unwrap(),
-        "--non-interactive",
     ];
 
     if incremental {