feat: better error handling

nix-js/Cargo.toml

@@ -24,6 +24,7 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
 derive_more = { version = "2", features = ["full"] }
 thiserror = "2"
+miette = { version = "7.4", features = ["fancy"] }
 
 hashbrown = "0.16"
 petgraph = "0.8"
@@ -40,6 +41,9 @@ nix-nar = "0.3"
 sha2 = "0.10"
 hex = "0.4"
 
+sourcemap = "9.0"
+base64 = "0.22"
+
 # Fetcher dependencies
 reqwest = { version = "0.12", features = ["blocking", "rustls-tls"], default-features = false }
 tar = "0.4"
@@ -54,6 +58,7 @@ tempfile = "3.24"
 rusqlite = { version = "0.33", features = ["bundled"] }
 
 rnix = "0.12"
+rowan = "0.15"
 
 nix-js-macros = { path = "../nix-js-macros" }