diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 68db736..69ef5c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+/.direnv/
+/.emscripten_cache/
 /.make-work/
 /.metals/
 /.vscode-test/
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..0f56f8b
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..5543517
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,35 @@
+{
+  description = "A Nix-flake-based development environment for vscode-parse-tree";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      overlays = [
+        (final: prev: rec {
+          nodejs = prev.nodejs-18_x;
+          yarn = (prev.yarn.override { inherit nodejs; });
+        })
+      ];
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit overlays system; };
+      });
+    in
+    {
+      devShells = forEachSupportedSystem
+        ({ pkgs }: {
+          default = pkgs.mkShell
+            {
+              packages = with pkgs; [ nodejs yarn emscripten python310 vsce ];
+              shellHook = ''
+                if [ ! -d $(pwd)/.emscripten_cache ]; then
+                  cp -R ${pkgs.emscripten}/share/emscripten/cache/ $(pwd)/.emscripten_cache
+                  chmod u+rwX -R $(pwd)/.emscripten_cache
+                  export EM_CACHE=$(pwd)/.emscripten_cache
+                fi
+              '';
+            };
+        });
+    };
+}