refactor: rework nix flake

Co-authored-by: Amaan Qureshi <amaanq12@gmail.com>

lib/binding_web/package.nix

@@ -0,0 +1,73 @@
+{
+  wasm-test-grammars,
+  lib,
+  buildNpmPackage,
+  rustPlatform,
+  cargo,
+  pkg-config,
+  emscripten,
+  src,
+  version,
+}:
+buildNpmPackage {
+  inherit src version;
+
+  pname = "web-tree-sitter";
+
+  npmDepsHash = "sha256-y0GobcskcZTmju90TM64GjeWiBmPFCrTOg0yfccdB+Q=";
+
+  nativeBuildInputs = [
+    rustPlatform.cargoSetupHook
+    cargo
+    pkg-config
+    emscripten
+  ];
+
+  cargoDeps = rustPlatform.importCargoLock {
+    lockFile = ../../Cargo.lock;
+  };
+
+  doCheck = true;
+
+  postPatch = ''
+    cp lib/binding_web/package{,-lock}.json .
+  '';
+
+  buildPhase = ''
+    pushd lib/binding_web
+
+    CJS=true npm run build
+    CJS=true npm run build:debug
+    npm run build:debug
+    npm run build
+
+    popd
+
+    mkdir -p target/release
+
+    for grammar in ${wasm-test-grammars}/*.wasm; do
+      if [ -f "$grammar" ]; then
+        cp "$grammar" target/release/
+      fi
+    done
+  '';
+
+  checkPhase = ''
+    cd lib/binding_web && npm test
+  '';
+
+  meta = {
+    description = "web-tree-sitter - WebAssembly bindings to the Tree-sitter parsing library.";
+    longDescription = ''
+      web-tree-sitter provides WebAssembly bindings to the Tree-sitter parsing library.
+      It can build a concrete syntax tree for a source file and efficiently update
+      the syntax tree as the source file is edited. This package provides the WebAssembly bindings
+      and a JavaScript API for using them in web browsers
+    '';
+    homepage = "https://tree-sitter.github.io/tree-sitter";
+    changelog = "https://github.com/tree-sitter/tree-sitter/releases/tag/v${version}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ amaanq ];
+    platforms = lib.platforms.all;
+  };
+}