Add file write operations

crates/lb/src/fs.rs

@@ -1,4 +1,5 @@
-//! The `lb:fs` library provides utilities for interacting with the file system asynchronously.
+//! The `lb:fs` library provides synchronous and asynchronous utilities for interacting with the
+//! file system.
 //!
 //! # Exports
 //!
@@ -31,4 +32,12 @@ impl lb_libfs {
     pub extern "Lua-C" fn read_sync(&self, path: &str) -> io::Result<Vec<u8>> {
         std::fs::read(path)
     }
+
+    pub async extern "Lua-C" fn write(&self, path: &str, contents: &[u8]) -> io::Result<()> {
+        fs::write(path, contents).await
+    }
+
+    pub extern "Lua-C" fn write_sync(&self, path: &str, contents: &[u8]) -> io::Result<()> {
+        std::fs::write(path, contents)
+    }
 }