feat: initial fetcher implementation

nix-js/Cargo.toml

@@ -28,12 +28,23 @@ deno_error = "0.7"
 sha2 = "0.10"
 hex = "0.4"
 
+# Fetcher dependencies
+reqwest = { version = "0.12", features = ["blocking", "rustls-tls"], default-features = false }
+tar = "0.4"
+flate2 = "1.0"
+xz2 = "0.1"
+bzip2 = "0.5"
+zip = "2.2"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+dirs = "5.0"
+tempfile = "3.24"
+
 rnix = "0.12"
 
 nix-js-macros = { path = "../nix-js-macros" }
 
 [dev-dependencies]
-tempfile = "3.24"
 criterion = { version = "0.5", features = ["html_reports"] }
 
 [[bench]]