Switch to a Nix flake

.envrc

@@ -1 +1 @@
-use nix
+use flake

flake.nix

@@ -0,0 +1,32 @@
+{
+  description = "Provision a dev environment";
+
+  inputs = {
+    typelevel-nix.url = "github:typelevel/typelevel-nix";
+    nixpkgs.follows = "typelevel-nix/nixpkgs";
+    flake-utils.follows = "typelevel-nix/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, typelevel-nix }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ typelevel-nix.overlay ];
+        };
+
+        mkShell = jdk: pkgs.devshell.mkShell {
+          imports = [ typelevel-nix.typelevelShell ];
+          name = "blaze";
+          typelevelShell = {
+            jdk.package = jdk;
+            nodejs.enable = false;
+            native.enable = false;
+          };
+        };
+      in
+      rec {
+        devShell = mkShell pkgs.jdk8;
+      }
+    );
+}