feat(migration): add batch import rewriting with gitignore support

Add file walker module and batch rewrite functionality to process all
TypeScript/JavaScript files in a directory while respecting .gitignore rules.

- Add `ignore` crate dependency for gitignore-aware directory walking
- Create `file_walker.rs` module with `find_ts_files()` function
- Add `BatchRewriteResult` struct for tracking modified/unchanged/error files
- Add `rewrite_imports_in_directory()` function for batch processing
- Export new public API: `find_ts_files`, `WalkResult`, `BatchRewriteResult`,
  `rewrite_imports_in_directory`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: fengmk2

Cargo.lock

@@ -48,6 +48,7 @@ fspy = { git = "https://github.com/voidzero-dev/vite-task", rev = "edf07c7eac63a
 futures-util = "0.3.31"
 hex = "0.4.3"
 httpmock = "0.7"
+ignore = "0.4"
 indoc = "2.0.5"
 napi = { version = "3.0.0", default-features = false, features = ["async", "error_anyhow"] }
 napi-build = "2"

Cargo.toml

@@ -12,6 +12,7 @@ anyhow = { workspace = true }
 ast-grep-config = { workspace = true }
 bincode = { workspace = true }
 bstr = { workspace = true }
+ignore = { workspace = true }
 nix = { workspace = true }
 rusqlite = { workspace = true }
 semver = { workspace = true }

crates/vite_error/Cargo.toml

@@ -54,6 +54,9 @@ pub enum Error {
     #[error(transparent)]
     WaxWalk(#[from] wax::WalkError),
 
+    #[error(transparent)]
+    IgnoreError(#[from] ignore::Error),
+
     #[error(transparent)]
     SerdeYml(#[from] serde_yml::Error),
 

crates/vite_error/src/lib.rs

@@ -10,6 +10,7 @@ rust-version.workspace = true
 ast-grep-config = { workspace = true }
 ast-grep-core = { workspace = true }
 ast-grep-language = { workspace = true }
+ignore = { workspace = true }
 serde_json = { workspace = true, features = ["preserve_order"] }
 vite_error = { workspace = true }
 

crates/vite_migration/Cargo.toml

@@ -0,0 +1,195 @@
+use std::path::{Path, PathBuf};
+
+use ignore::WalkBuilder;
+use vite_error::Error;
+
+/// File extensions to process for import rewriting
+const TS_JS_EXTENSIONS: &[&str] = &["ts", "tsx", "mts", "cts", "js", "jsx", "mjs", "cjs"];
+
+/// Result of walking TypeScript/JavaScript files
+#[derive(Debug)]
+pub struct WalkResult {
+    /// List of file paths found
+    pub files: Vec<PathBuf>,
+}
+
+/// Find all TypeScript/JavaScript files in a directory, respecting gitignore
+///
+/// This function walks the directory tree starting from `root` and finds all files
+/// with TypeScript or JavaScript extensions (.ts, .tsx, .mts, .cts, .js, .jsx, .mjs, .cjs).
+///
+/// The walk respects:
+/// - `.gitignore` files in the directory tree
+/// - Global gitignore configuration
+/// - `.git/info/exclude` files
+/// - Hidden files and directories are skipped
+///
+/// # Arguments
+///
+/// * `root` - The root directory to start searching from
+///
+/// # Returns
+///
+/// Returns a `WalkResult` containing the list of found files, or an error if
+/// the directory walk fails.
+///
+/// # Example
+///
+/// ```ignore
+/// use std::path::Path;
+/// use vite_migration::find_ts_files;
+///
+/// let result = find_ts_files(Path::new("./src"))?;
+/// for file in result.files {
+///     println!("Found: {}", file.display());
+/// }
+/// ```
+pub fn find_ts_files(root: &Path) -> Result<WalkResult, Error> {
+    let mut files = Vec::new();
+
+    let walker = WalkBuilder::new(root)
+        .hidden(true) // Skip hidden files/dirs
+        .git_ignore(true) // Respect .gitignore
+        .git_global(true) // Respect global gitignore
+        .git_exclude(true) // Respect .git/info/exclude
+        .require_git(false) // Work even if not a git repo
+        .build();
+
+    for entry in walker {
+        let entry = entry?;
+        let path = entry.path();
+
+        // Skip directories
+        if path.is_dir() {
+            continue;
+        }
+
+        // Check extension
+        if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
+            if TS_JS_EXTENSIONS.contains(&ext) {
+                files.push(path.to_path_buf());
+            }
+        }
+    }
+
+    Ok(WalkResult { files })
+}
+
+#[cfg(test)]
+mod tests {
+    use std::fs;
+
+    use tempfile::tempdir;
+
+    use super::*;
+
+    #[test]
+    fn test_find_ts_files_basic() {
+        let temp = tempdir().unwrap();
+
+        // Create test files
+        fs::write(temp.path().join("app.ts"), "").unwrap();
+        fs::write(temp.path().join("utils.tsx"), "").unwrap();
+        fs::write(temp.path().join("config.js"), "").unwrap();
+        fs::write(temp.path().join("readme.md"), "").unwrap();
+
+        let result = find_ts_files(temp.path()).unwrap();
+
+        // Should find ts, tsx, js but not md
+        assert_eq!(result.files.len(), 3);
+    }
+
+    #[test]
+    fn test_find_ts_files_nested() {
+        let temp = tempdir().unwrap();
+
+        // Create nested directory
+        fs::create_dir(temp.path().join("src")).unwrap();
+        fs::write(temp.path().join("src/index.ts"), "").unwrap();
+        fs::write(temp.path().join("src/utils.tsx"), "").unwrap();
+
+        // Create deeper nesting
+        fs::create_dir_all(temp.path().join("src/components")).unwrap();
+        fs::write(temp.path().join("src/components/Button.tsx"), "").unwrap();
+
+        let result = find_ts_files(temp.path()).unwrap();
+
+        assert_eq!(result.files.len(), 3);
+    }
+
+    #[test]
+    fn test_find_ts_files_respects_gitignore() {
+        let temp = tempdir().unwrap();
+
+        // Create test files
+        fs::write(temp.path().join("app.ts"), "").unwrap();
+
+        // Create node_modules (should be ignored via gitignore)
+        fs::create_dir(temp.path().join("node_modules")).unwrap();
+        fs::write(temp.path().join("node_modules/pkg.ts"), "").unwrap();
+
+        // Create dist (should be ignored via gitignore)
+        fs::create_dir(temp.path().join("dist")).unwrap();
+        fs::write(temp.path().join("dist/bundle.js"), "").unwrap();
+
+        // Create .gitignore
+        fs::write(temp.path().join(".gitignore"), "node_modules/\ndist/").unwrap();
+
+        let result = find_ts_files(temp.path()).unwrap();
+
+        // Should only find app.ts, not node_modules or dist files
+        assert_eq!(result.files.len(), 1);
+        assert!(result.files[0].ends_with("app.ts"));
+    }
+
+    #[test]
+    fn test_find_ts_files_all_extensions() {
+        let temp = tempdir().unwrap();
+
+        // Create files with all supported extensions
+        fs::write(temp.path().join("a.ts"), "").unwrap();
+        fs::write(temp.path().join("b.tsx"), "").unwrap();
+        fs::write(temp.path().join("c.mts"), "").unwrap();
+        fs::write(temp.path().join("d.cts"), "").unwrap();
+        fs::write(temp.path().join("e.js"), "").unwrap();
+        fs::write(temp.path().join("f.jsx"), "").unwrap();
+        fs::write(temp.path().join("g.mjs"), "").unwrap();
+        fs::write(temp.path().join("h.cjs"), "").unwrap();
+
+        // Create non-matching files
+        fs::write(temp.path().join("i.json"), "").unwrap();
+        fs::write(temp.path().join("j.css"), "").unwrap();
+        fs::write(temp.path().join("k.html"), "").unwrap();
+
+        let result = find_ts_files(temp.path()).unwrap();
+
+        assert_eq!(result.files.len(), 8);
+    }
+
+    #[test]
+    fn test_find_ts_files_empty_directory() {
+        let temp = tempdir().unwrap();
+
+        let result = find_ts_files(temp.path()).unwrap();
+
+        assert!(result.files.is_empty());
+    }
+
+    #[test]
+    fn test_find_ts_files_skips_hidden() {
+        let temp = tempdir().unwrap();
+
+        // Create visible file
+        fs::write(temp.path().join("visible.ts"), "").unwrap();
+
+        // Create hidden directory with ts file
+        fs::create_dir(temp.path().join(".hidden")).unwrap();
+        fs::write(temp.path().join(".hidden/secret.ts"), "").unwrap();
+
+        let result = find_ts_files(temp.path()).unwrap();
+
+        // Should only find visible.ts
+        assert_eq!(result.files.len(), 1);
+        assert!(result.files[0].ends_with("visible.ts"));
+    }
+}

crates/vite_migration/src/file_walker.rs

@@ -1,6 +1,11 @@
 mod ast_grep;
+mod file_walker;
 mod package;
 mod vite_config;
 
+pub use file_walker::{WalkResult, find_ts_files};
 pub use package::rewrite_scripts;
-pub use vite_config::{MergeResult, RewriteResult, merge_json_config, rewrite_import};
+pub use vite_config::{
+    BatchRewriteResult, MergeResult, RewriteResult, merge_json_config, rewrite_import,
+    rewrite_imports_in_directory,
+};