From 6f50501b0583d42186d81dc6a67395acbfa9d9b5 Mon Sep 17 00:00:00 2001
From: Quinn Dougherty <quinnd@riseup.net>
Date: Wed, 17 Aug 2022 20:42:40 -0700
Subject: [PATCH] plausibly have a build that will do better through CI than
 previously

---
 .github/workflows/ci.yml                    |   34 +-
 .prettierignore                             |    2 +
 flake.lock                                  |   99 +-
 flake.nix                                   |   74 +-
 nix/rust-toolchain.toml                     |    5 +
 nix/shell.nix                               |    4 +-
 nix/squiggle-components.nix                 |   15 +-
 nix/squiggle-lang.nix                       |    4 +-
 nix/squiggle-mc.nix                         |   80 +-
 nix/squiggle-website.nix                    |   16 +-
 packages/mc/Cargo.lock                      |   73 +-
 packages/mc/Cargo.nix                       | 1226 -------------------
 packages/mc/Cargo.toml                      |   13 +-
 packages/mc/README.md                       |   51 +-
 packages/mc/cargo-refresh-nix.sh            |    2 -
 packages/mc/src/distribution/monte_carlo.rs |   51 +-
 packages/mc/src/lib.rs                      |   23 +-
 packages/mc/static/index.html               |    2 +-
 packages/mc/webpack.config.js               |    2 +-
 19 files changed, 188 insertions(+), 1588 deletions(-)
 create mode 100644 nix/rust-toolchain.toml
 delete mode 100644 packages/mc/Cargo.nix
 delete mode 100755 packages/mc/cargo-refresh-nix.sh

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e0da6aed..b56cd49b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -69,11 +69,11 @@ jobs:
       - name: Download wasm-bindgen
         uses: jetli/wasm-bindgen-action@v0.1.0
         with:
-          version: 'latest'
+          version: "latest"
       - name: Download wasm-pack
         uses: jetli/wasm-pack-action@v0.3.0
         with:
-          version: 'latest'
+          version: "latest"
       - name: Build
         run: wasm-pack build --target nodejs
 
@@ -88,7 +88,7 @@ jobs:
         working-directory: packages/squiggle-lang
     steps:
       - uses: actions/checkout@v3
-      - name: Install Dependencies
+      - name: Install dependencies
         run: cd ../../ && yarn
       - name: Check rescript lint
         run: yarn lint:rescript
@@ -116,13 +116,13 @@ jobs:
       - name: Download wasm-bindgen
         uses: jetli/wasm-bindgen-action@v0.1.0
         with:
-          version: 'latest'
+          version: "latest"
       - name: Download wasm-pack
         uses: jetli/wasm-pack-action@v0.3.0
         with:
-          version: 'latest'
-      - name: Build
-        run: wasm-pack build --target nodejs
+          version: "latest"
+      - name: Build squiggle-mc
+        run: cd ../mc && wasm-pack build --target nodejs
       - name: Build rescript codebase and typescript interface
         run: yarn build
       - name: Run rescript tests
@@ -169,13 +169,13 @@ jobs:
       - name: Download wasm-bindgen
         uses: jetli/wasm-bindgen-action@v0.1.0
         with:
-          version: 'latest'
+          version: "latest"
       - name: Download wasm-pack
         uses: jetli/wasm-pack-action@v0.3.0
         with:
-          version: 'latest'
-      - name: Build
-        run: wasm-pack build --target nodejs
+          version: "latest"
+      - name: Build squiggle-mc
+        run: cd ../mc wasm-pack build --target nodejs
       - name: Build rescript codebase and typescript interface in squiggle-lang
         run: cd ../squiggle-lang && yarn build
       - name: Run webpack
@@ -216,13 +216,13 @@ jobs:
       - name: Download wasm-bindgen
         uses: jetli/wasm-bindgen-action@v0.1.0
         with:
-          version: 'latest'
+          version: "latest"
       - name: Download wasm-pack
         uses: jetli/wasm-pack-action@v0.3.0
         with:
-          version: 'latest'
-      - name: Build
-        run: wasm-pack build --target nodejs
+          version: "latest"
+      - name: Build squiggle-mc
+        run: cd ../mc wasm-pack build --target nodejs
       - name: Build rescript and typescript in squiggle-lang
         run: cd ../squiggle-lang && yarn build
       - name: Build components
@@ -259,7 +259,9 @@ jobs:
       - uses: actions/checkout@v3
       - name: Install dependencies from monorepo level
         run: cd ../../ && yarn
-      - name: Build
+      - name: Build squiggle-mc
+        run: cd ../mc && wasm-pack build --target nodejs
+      - name: Build vscode
         run: yarn compile
 
   cli-lint:
diff --git a/.prettierignore b/.prettierignore
index cdbdaa36..18cb3b19 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -14,3 +14,5 @@ packages/website/build/
 packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.js
 packages/vscode-ext/media/vendor/
 packages/mc/pkg/
+packages/mc/target/
+result
diff --git a/flake.lock b/flake.lock
index 988f334a..27fd0160 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,52 +1,12 @@
 {
   "nodes": {
-    "cargo2nix": {
-      "inputs": {
-        "flake-compat": "flake-compat",
-        "flake-utils": "flake-utils",
-        "nixpkgs": [
-          "nixpkgs"
-        ],
-        "rust-overlay": "rust-overlay"
-      },
-      "locked": {
-        "lastModified": 1655189312,
-        "narHash": "sha256-gpJ57OgIebUpO+7F00VltxSEy6dz2x6HeJ5BcRM8rDA=",
-        "owner": "cargo2nix",
-        "repo": "cargo2nix",
-        "rev": "c149357cc3d17f2849c73eb7a09d07a307cdcfe8",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cargo2nix",
-        "ref": "release-0.11.0",
-        "repo": "cargo2nix",
-        "type": "github"
-      }
-    },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1650374568,
-        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
     "flake-utils": {
       "locked": {
-        "lastModified": 1653893745,
-        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
         "type": "github"
       },
       "original": {
@@ -72,11 +32,11 @@
     },
     "flake-utils_3": {
       "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "lastModified": 1656928814,
+        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
         "type": "github"
       },
       "original": {
@@ -87,7 +47,7 @@
     },
     "gentype": {
       "inputs": {
-        "flake-utils": "flake-utils_3",
+        "flake-utils": "flake-utils_2",
         "nixpkgs": [
           "nixpkgs"
         ]
@@ -126,33 +86,13 @@
         "type": "github"
       }
     },
-    "naersk": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1659610603,
-        "narHash": "sha256-LYgASYSPYo7O71WfeUOaEUzYfzuXm8c8eavJcel+pfI=",
-        "owner": "nix-community",
-        "repo": "naersk",
-        "rev": "c6a45e4277fa58abd524681466d3450f896dc094",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "repo": "naersk",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1660496378,
-        "narHash": "sha256-sgAhmrC1iSnl5T2VPPiMpciH1aRw5c7PYEdXX6jd6Gk=",
+        "lastModified": 1660581366,
+        "narHash": "sha256-et+bi9/jlSF/pHx5AYB9ZP2XDdZEQ0vnF7xlvs4503Y=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "879121648fe522b38cc1cf75aef160a14a1f2e7b",
+        "rev": "3d47bbaa26e7a771059d828eecf3bd8bf28a8b0f",
         "type": "github"
       },
       "original": {
@@ -163,31 +103,26 @@
     },
     "root": {
       "inputs": {
-        "cargo2nix": "cargo2nix",
-        "flake-utils": "flake-utils_2",
+        "flake-utils": "flake-utils",
         "gentype": "gentype",
         "hercules-ci-effects": "hercules-ci-effects",
-        "naersk": "naersk",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
       }
     },
     "rust-overlay": {
       "inputs": {
-        "flake-utils": [
-          "cargo2nix",
-          "flake-utils"
-        ],
+        "flake-utils": "flake-utils_3",
         "nixpkgs": [
-          "cargo2nix",
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1653878966,
-        "narHash": "sha256-T51Gck/vrJZi1m+uTbhEFTRgZmE59sydVONadADv358=",
+        "lastModified": 1660704984,
+        "narHash": "sha256-9sMoNrKh0b5NOEwe1j6H4dTRAsBsq1fmyDCXHzjB3Nc=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "8526d618af012a923ca116be9603e818b502a8db",
+        "rev": "2801b291b546dcdcebfa47043fe09f7a0da72880",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 5021151e..7f12e710 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,12 +3,8 @@
 
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-22.05";
-    naersk = {
-      url = "github:nix-community/naersk";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-    cargo2nix = {
-      url = "github:cargo2nix/cargo2nix/release-0.11.0";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     gentype = {
@@ -25,20 +21,14 @@
     };
   };
 
-  outputs = { self, nixpkgs, gentype, hercules-ci-effects, naersk, cargo2nix
-    , flake-utils, ... }:
+  outputs = { self, nixpkgs, rust-overlay, gentype, hercules-ci-effects, flake-utils, ... }:
     let
       version = builtins.substring 0 8 self.lastModifiedDate;
-      crossSystemForWasmPkgs = {
-        config = "wasm32-unknown-wasi-unknown";
-        system = "wasm32-wasi";
-        useLLVM = true;
-      };
       overlays = [
-        cargo2nix.overlays.default
+        rust-overlay.overlays.default
         (final: prev: {
           # set the node version here
-          nodejs = prev.nodejs-16_x;
+          nodejs = prev.nodejs-18_x;
           # The override is the only way to get it into mkYarnModules
         })
       ];
@@ -48,17 +38,13 @@
         prettier = with pkgs.nodePackages; [ prettier ];
         which = [ pkgs.which ];
       };
-      naerskFn = { pkgs, rust, ... }:
-        pkgs.callPackage naersk {
-          cargo = rust;
-          rustc = rust;
-        };
       gentypeOutputFn = pkgs: gentype.outputs.packages.${pkgs.system}.default;
-      mcFn = { pkgs, wasmPkgs, ... }:
+      mcFn = { pkgs, ... }:
         import ./nix/squiggle-mc.nix {
-          inherit pkgs wasmPkgs commonFn naerskFn;
+          inherit pkgs;
         };
       langFn = { pkgs, ... }:
+        # Probably doesn't work on i686-linux
         import ./nix/squiggle-lang.nix {
           inherit pkgs commonFn mcFn gentypeOutputFn;
         };
@@ -72,17 +58,17 @@
         };
 
       # local machines
-      localFlake = { pkgs, wasmPkgs, ... }:
+      localFlake = { pkgs, ... }:
         let
-          mc = mcFn { inherit pkgs wasmPkgs; };
+          mc = mcFn pkgs;
           lang = langFn pkgs;
           components = componentsFn pkgs;
           website = websiteFn pkgs;
         in {
           # validating
           checks = flake-utils.lib.flattenTree {
-            wasm-lint = mc.rust-lint;
-            wasm-headless-test = mc.firefox-test;
+            wasm-lint = mc.lint;
+            wasm-test = mc.test;
             lang-lint = lang.lint;
             lang-test = lang.test;
             components-lint = components.lint;
@@ -90,20 +76,16 @@
           };
           # building
           packages = flake-utils.lib.flattenTree {
-            default = website.docusaurus;
-            mc-wasm = mc.lib;
-            mc-wasm2 = mc.lib2;
-            mc-wasm-pkg = mc.webpack-build-pkg;
+            default = components.package-build;
+            mc-wasm = mc.pkg;
             lang-bundle = lang.bundle;
             components = components.package-build;
-            storybook = components.site-build;
-            docs-site = website.docusaurus;
           };
 
           # developing
           devShells = flake-utils.lib.flattenTree {
             default =
-              (import ./nix/shell.nix { inherit pkgs cargo2nix; }).shell;
+              (import ./nix/shell.nix { inherit pkgs; }).shell;
           };
         };
 
@@ -111,16 +93,8 @@
       herc = let
         hciSystem = "x86_64-linux";
         hciPkgs = import nixpkgs { system = hciSystem; };
-        hciPkgsWasm = import nixpkgs {
-          system = hciSystem;
-          crossSystem = crossSystemForWasmPkgs;
-          overlays = overlays;
-        };
         effects = hercules-ci-effects.lib.withPkgs hciPkgs;
-        mc = mcFn {
-          pkgs = hciPkgs;
-          wasmPkgs = hciPkgsWasm;
-        };
+        mc = mcFn hciPkgs;
         lang = langFn hciPkgs;
         components = componentsFn hciPkgs;
         website = websiteFn hciPkgs;
@@ -129,9 +103,9 @@
           ciSystems = [ hciSystem ];
           onPush = {
             wasm.outputs = {
-              squiggle-wasm-lint = mc.rust-lint;
-              squiggle-wasm-pkg = mc.webpack-build-pkg;
-              squiggle-wasm-test-ff = mc.firefox-test;
+              squiggle-wasm-lint = mc.lint;
+              squiggle-wasm-pkg = mc.pkg;
+              squiggle-wasm-test = mc.test;
             };
             lang.outputs = {
               squiggle-lang-lint = lang.lint;
@@ -158,14 +132,6 @@
           inherit system;
           overlays = overlays;
         };
-        pkgsWasm = import nixpkgs {
-          inherit system;
-          overlays = overlays;
-          crossSystem = crossSystemForWasmPkgs;
-        };
 
-      in localFlake {
-        pkgs = pkgs;
-        wasmPkgs = pkgsWasm;
-      }) // herc;
+      in localFlake pkgs) // herc;
 }
diff --git a/nix/rust-toolchain.toml b/nix/rust-toolchain.toml
new file mode 100644
index 00000000..e58edcb5
--- /dev/null
+++ b/nix/rust-toolchain.toml
@@ -0,0 +1,5 @@
+[toolchain]
+channel = "stable"
+components = []
+targets = [ "wasm32-unknown-unknown" ]
+profile = "default"
diff --git a/nix/shell.nix b/nix/shell.nix
index 84d05b29..16c20eab 100644
--- a/nix/shell.nix
+++ b/nix/shell.nix
@@ -1,4 +1,4 @@
-{ pkgs, cargo2nix }:
+{ pkgs }:
 with pkgs; {
   shell = mkShell {
     name = "SQUIGGLE_yarn-wasm-devshell";
@@ -13,9 +13,9 @@ with pkgs; {
       libressl
       nixfmt
       rustfmt
-      cargo2nix.outputs.packages.${pkgs.system}.default
       wasmtime
       binaryen
+      wasm-bindgen-cli
     ];
   };
 }
diff --git a/nix/squiggle-components.nix b/nix/squiggle-components.nix
index 566b7eb1..15f1e877 100644
--- a/nix/squiggle-components.nix
+++ b/nix/squiggle-components.nix
@@ -17,7 +17,7 @@ rec {
     src = ../packages/components;
     packageJSON = componentsPackageJson;
     yarnLock = ../yarn.lock;
-    packageResolutions."@quri/squiggle-mc" = mc.webpack-build-pkg;
+    packageResolutions."@quri/squiggle-mc" = mc.pkg;
     packageResolutions."@quri/squiggle-lang" = lang.build;
   };
   lint = pkgs.stdenv.mkDerivation {
@@ -52,17 +52,4 @@ rec {
       cp -r deps/@quri/squiggle-components/. $out
     '';
   };
-  site-build = pkgs.stdenv.mkDerivation {
-    name = "squiggle-components-storybook";
-    src = package-build;
-    buildInputs = common.buildInputs;
-    buildPhase = "yarn build:storybook";
-    installPhase = ''
-      mkdir -p $out
-
-      # patching .gitignore so flake keeps build artefacts
-      sed -i /build/d .gitignore
-      sed -i /storybook-static/d .gitignore
-    '';
-  };
 }
diff --git a/nix/squiggle-lang.nix b/nix/squiggle-lang.nix
index 7ef96f3e..b8181c97 100644
--- a/nix/squiggle-lang.nix
+++ b/nix/squiggle-lang.nix
@@ -10,7 +10,7 @@ rec {
     yarnLock = ../yarn.lock;
     pkgConfig = {
       rescript = {
-        buildInputs = common.which ++ [ pkgs.gcc_multi ];
+        buildInputs = common.which ++ (if pkgs.system != "i686-linux" then [ pkgs.gcc_multi ] else []);
         postInstall = ''
           echo "PATCHELF'ING RESCRIPT EXECUTABLES (INCL NINJA)"
           # Patching interpreter for linux/*.exe's
@@ -39,7 +39,7 @@ rec {
         '';
       };
     };
-    packageResolutions."@quri/squiggle-mc" = mc.webpack-build-pkg;
+    packageResolutions."@quri/squiggle-mc" = mc.pkg;
   };
   lint = pkgs.stdenv.mkDerivation {
     name = "squiggle-lang-lint";
diff --git a/nix/squiggle-mc.nix b/nix/squiggle-mc.nix
index 7e933a47..1db46975 100644
--- a/nix/squiggle-mc.nix
+++ b/nix/squiggle-mc.nix
@@ -1,65 +1,43 @@
-{ pkgs, wasmPkgs, commonFn, naerskFn }:
+{ pkgs }:
 
-rec {
-  common = commonFn pkgs;
-
-  rustVersion = "1.61.0";
-  wasmTarget = "wasm32-unknown-unknown";
-  rust = pkgs.rust-bin.stable.${rustVersion}.default.override {
-    targets = [ wasmTarget ];
-  };
-  naersk = naerskFn { inherit pkgs rust; };
-  mc-pkg = naersk.buildPackage {
+with pkgs.rustPlatform; rec {
+  rust = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+  pkg = buildRustPackage {
+    pname = "quri_squiggle_mc";
+    version = "0.0.1";
     src = ../packages/mc;
-    copyLibs = true;
-    copyBins = true;
-    CARGO_BUILD_TARGET = wasmTarget;
-    nativeBuildInputs = common.buildInputs;
-  };
-  lib2 = mc-pkg;
 
-  rustPkgsWasm = wasmPkgs.rustBuilder.makePackageSet {
-    rustVersion = rustVersion;
-    packageFun = import ../packages/mc/Cargo.nix;
-    target = wasmTarget;
-  };
-  lib = (rustPkgsWasm.workspace.quri-squiggle-mc { }).out;
+    nativeBuildInputs = [ rust pkgs.wasm-bindgen-cli ];
 
-  yarn-source = pkgs.mkYarnPackage {
-    name = "squiggle-mc_yarnsource";
-    buildInputs = common.buildInputs;
-    src = ../packages/mc;
-    packageJSON = ../packages/mc/package.json;
-    yarnLock = ../yarn.lock;
+    buildPhase = ''
+      cargo build --lib --release --target=wasm32-unknown-unknown
+
+      mkdir -p $out/pkg
+
+      wasm-bindgen --target nodejs --out-dir $out/pkg target/wasm32-unknown-unknown/release/quri_squiggle_mc.wasm
+    '';
+    installPhase = "echo 'skipping installPhase'";
+
+    cargoLock = {
+      lockFile = ../packages/mc/Cargo.lock;
+      outputHashes = {
+        "kernel_density-0.0.2" = "sha256-pHh5p/AS+uopmPSaXK9rKHlmqS26qggXvf1TeitS430=";
+      };
+    };
   };
-  rust-lint = pkgs.stdenv.mkDerivation {
+  lint = pkgs.stdenv.mkDerivation {
     name = "squiggle-mc-lint";
-    src = yarn-source + "/libexec/@quri/squiggle-mc/deps/@quri/squiggle-mc";
+    src = ../packages/mc;
     buildInputs = with pkgs; [ rustfmt ];
     buildPhase = "rustfmt --check src";
     installPhase = "mkdir -p $out";
   };
-  webpack-build-pkg = pkgs.stdenv.mkDerivation {
-    name = "squiggle-mc-build";
-    src = yarn-source + "/libexec/@quri/squiggle-mc";
-    buildInputs = common.buildInputs ++ (with pkgs; [ wasm-pack ]);
-    buildPhase = ''
-      pushd deps/@quri/squiggle-mc
-      sed -i /pkg/d .gitignore
-      yarn --offline build
-      popd
-    '';
-    installPhase = ''
-      mkdir -p $out
-      cp -r deps/@quri/squiggle-mc/. $out
-    '';
-  };
-  firefox-test = pkgs.stdenv.mkDerivation {
+
+  test = pkgs.stdenv.mkDerivation {
     name = "squiggle-mc-test";
-    src = yarn-source + "/libexec/@quri/squiggle-mc/deps/@quri/squiggle-mc";
-    buildInputs = common.buildInputs
-      ++ (with pkgs; [ geckodriver cargo wasm-pack ]);
-    buildPhase = "yarn --offline test -- --firefox";
+    src = mc-pkg + "/pkg";
+    buildInputs = with pkgs; [ cargo ];
+    buildPhase = "cargo test";
     installPhase = "mkdir -p $out";
   };
 }
diff --git a/nix/squiggle-website.nix b/nix/squiggle-website.nix
index df2eec54..90a9ec6b 100644
--- a/nix/squiggle-website.nix
+++ b/nix/squiggle-website.nix
@@ -18,7 +18,7 @@ rec {
     src = ../packages/website;
     packageJSON = websitePackageJson;
     yarnLock = ../yarn.lock;
-    packageResolutions."@quri/squiggle-mc" = mc.webpack-build-pkg + "/pkg";
+    packageResolutions."@quri/squiggle-mc" = mc.pkg;
     packageResolutions."@quri/squiggle-lang" = lang.build;
     packageResolutions."@quri/squiggle-components" = components.package-build;
   };
@@ -29,18 +29,4 @@ rec {
     buildPhase = "yarn --offline lint";
     installPhase = "mkdir -p $out";
   };
-  docusaurus = pkgs.stdenv.mkDerivation {
-    name = "squiggle-website";
-    buildInputs = common.buildInputs;
-    src = yarn-source + "/libexec/squiggle-website";
-    buildPhase = ''
-      pushd deps/squiggle-website
-      yarn --offline build
-      popd
-    '';
-    installPhase = ''
-      mkdir -p $out
-      cp -r $src/build $out
-    '';
-  };
 }
diff --git a/packages/mc/Cargo.lock b/packages/mc/Cargo.lock
index 08aec2e1..f4b83d8d 100644
--- a/packages/mc/Cargo.lock
+++ b/packages/mc/Cargo.lock
@@ -36,9 +36,9 @@ checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "bumpalo"
-version = "3.10.0"
+version = "3.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37ccbd214614c6783386c1af30caf03192f17891059cecc394b4fb119e363de3"
+checksum = "c1ad822118d20d2c234f427000d5acc36eabe1e29a348c89b63dd60b13f28e5d"
 
 [[package]]
 name = "cached"
@@ -277,9 +277,9 @@ checksum = "6c8af84674fe1f223a982c933a0ee1086ac4d4052aa0fb8060c12c6ad838e754"
 
 [[package]]
 name = "js-sys"
-version = "0.3.59"
+version = "0.3.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "258451ab10b34f8af53416d1fdab72c22e805f0c92a1136d59470ec0b11138b2"
+checksum = "a38fc24e30fd564ce974c02bf1d337caddff65be6cc4735a1f7eab22a7440f04"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -305,12 +305,6 @@ version = "0.2.132"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8371e4e5341c3a96db127eb2465ac681ced4c433e01dd0e938adbef26ba93ba5"
 
-[[package]]
-name = "libm"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "292a948cd991e376cf75541fe5b97a1081d713c618b4f1b9500f8844e49eb565"
-
 [[package]]
 name = "log"
 version = "0.4.17"
@@ -332,16 +326,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8452105ba047068f40ff7093dd1d9da90898e63dd61736462e9cdda6a90ad3c3"
 
-[[package]]
-name = "num-traits"
-version = "0.2.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
-dependencies = [
- "autocfg",
- "libm",
-]
-
 [[package]]
 name = "num_cpus"
 version = "1.13.1"
@@ -447,8 +431,8 @@ dependencies = [
  "quickcheck",
  "quickcheck_macros",
  "rand 0.8.5",
- "rand_distr",
  "serde",
+ "serde-wasm-bindgen",
  "statistics",
  "wasm-bindgen",
  "wasm-bindgen-futures",
@@ -525,16 +509,6 @@ dependencies = [
  "getrandom",
 ]
 
-[[package]]
-name = "rand_distr"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32cb0b9bc82b0a0876c2dd994a7e7a2683d3e7390ca40e6886785ef0c7e3ee31"
-dependencies = [
- "num-traits",
- "rand 0.8.5",
-]
-
 [[package]]
 name = "rdrand"
 version = "0.4.0"
@@ -582,6 +556,17 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-wasm-bindgen"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cfc62771e7b829b517cb213419236475f434fb480eddd76112ae182d274434a"
+dependencies = [
+ "js-sys",
+ "serde",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.143"
@@ -697,9 +682,9 @@ checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.82"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc7652e3f6c4706c8d9cd54832c4a4ccb9b5336e2c3bd154d5cccfbf1c1f5f7d"
+checksum = "25f1af7423d8588a3d840681122e72e6a24ddbcb3f0ec385cac0d12d24256c06"
 dependencies = [
  "cfg-if 1.0.0",
  "serde",
@@ -709,13 +694,13 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.82"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "662cd44805586bd52971b9586b1df85cdbbd9112e4ef4d8f41559c334dc6ac3f"
+checksum = "8b21c0df030f5a177f3cba22e9bc4322695ec43e7257d865302900290bcdedca"
 dependencies = [
  "bumpalo",
+ "lazy_static",
  "log",
- "once_cell",
  "proc-macro2 1.0.43",
  "quote 1.0.21",
  "syn",
@@ -737,9 +722,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.82"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b260f13d3012071dfb1512849c033b1925038373aea48ced3012c09df952c602"
+checksum = "2f4203d69e40a52ee523b2529a773d5ffc1dc0071801c87b3d270b471b80ed01"
 dependencies = [
  "quote 1.0.21",
  "wasm-bindgen-macro-support",
@@ -747,9 +732,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.82"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5be8e654bdd9b79216c2929ab90721aa82faf65c48cdf08bdc4e7f51357b80da"
+checksum = "bfa8a30d46208db204854cadbb5d4baf5fcf8071ba5bf48190c3e59937962ebc"
 dependencies = [
  "proc-macro2 1.0.43",
  "quote 1.0.21",
@@ -760,9 +745,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.82"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6598dd0bd3c7d51095ff6531a5b23e02acdc81804e30d8f07afb77b7215a140a"
+checksum = "3d958d035c4438e28c70e4321a2911302f10135ce78a9c7834c0cab4123d06a2"
 
 [[package]]
 name = "wasm-bindgen-test"
@@ -791,9 +776,9 @@ dependencies = [
 
 [[package]]
 name = "web-sys"
-version = "0.3.59"
+version = "0.3.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed055ab27f941423197eb86b2035720b1a3ce40504df082cac2ecc6ed73335a1"
+checksum = "c060b319f29dd25724f09a2ba1418f142f539b2be99fbf4d2d5a8f7330afb8eb"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
diff --git a/packages/mc/Cargo.nix b/packages/mc/Cargo.nix
deleted file mode 100644
index 43f931e3..00000000
--- a/packages/mc/Cargo.nix
+++ /dev/null
@@ -1,1226 +0,0 @@
-# This file was @generated by cargo2nix 0.11.0.
-# It is not intended to be manually edited.
-
-args@{
-  release ? true,
-  rootFeatures ? [
-    "quri_squiggle_mc/default"
-  ],
-  rustPackages,
-  buildRustPackages,
-  hostPlatform,
-  hostPlatformCpu ? null,
-  hostPlatformFeatures ? [],
-  target ? null,
-  codegenOpts ? null,
-  profileOpts ? null,
-  rustcLinkFlags ? null,
-  rustcBuildFlags ? null,
-  mkRustCrate,
-  rustLib,
-  lib,
-  workspaceSrc,
-}:
-let
-  workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
-in let
-  inherit (rustLib) fetchCratesIo fetchCrateLocal fetchCrateGit fetchCrateAlternativeRegistry expandFeatures decideProfile genDrvsByProfile;
-  profilesByName = {
-    release = builtins.fromTOML "lto = true\n";
-  };
-  rootFeatures' = expandFeatures rootFeatures;
-  overridableMkRustCrate = f:
-    let
-      drvs = genDrvsByProfile profilesByName ({ profile, profileName }: mkRustCrate ({ inherit release profile hostPlatformCpu hostPlatformFeatures target profileOpts codegenOpts rustcLinkFlags rustcBuildFlags; } // (f profileName)));
-    in { compileMode ? null, profileName ? decideProfile compileMode release }:
-      let drv = drvs.${profileName}; in if compileMode == null then drv else drv.override { inherit compileMode; };
-in
-{
-  cargo2nixVersion = "0.11.0";
-  workspace = {
-    quri_squiggle_mc = rustPackages.unknown.quri_squiggle_mc."0.0.1";
-  };
-  "registry+https://github.com/rust-lang/crates.io-index".aho-corasick."0.7.18" = overridableMkRustCrate (profileName: rec {
-    name = "aho-corasick";
-    version = "0.7.18";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"; };
-    features = builtins.concatLists [
-      [ "default" ]
-      [ "std" ]
-    ];
-    dependencies = {
-      memchr = rustPackages."registry+https://github.com/rust-lang/crates.io-index".memchr."2.5.0" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".async-trait."0.1.57" = overridableMkRustCrate (profileName: rec {
-    name = "async-trait";
-    version = "0.1.57";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "76464446b8bc32758d7e88ee1a804d9914cd9b1cb264c029899680b0be29826f"; };
-    dependencies = {
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".async_once."0.2.6" = overridableMkRustCrate (profileName: rec {
-    name = "async_once";
-    version = "0.2.6";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "2ce4f10ea3abcd6617873bae9f91d1c5332b4a778bd9ce34d0cd517474c1de82"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".autocfg."1.1.0" = overridableMkRustCrate (profileName: rec {
-    name = "autocfg";
-    version = "1.1.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".bumpalo."3.10.0" = overridableMkRustCrate (profileName: rec {
-    name = "bumpalo";
-    version = "3.10.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "37ccbd214614c6783386c1af30caf03192f17891059cecc394b4fb119e363de3"; };
-    features = builtins.concatLists [
-      [ "default" ]
-    ];
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".cached."0.38.0" = overridableMkRustCrate (profileName: rec {
-    name = "cached";
-    version = "0.38.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "27e6092f8c7ba6e65a46f6f26d7d7997201d3a6f0e69ff5d2440b930d7c0513a"; };
-    features = builtins.concatLists [
-      [ "async" ]
-      [ "async-trait" ]
-      [ "async_once" ]
-      [ "cached_proc_macro" ]
-      [ "cached_proc_macro_types" ]
-      [ "default" ]
-      [ "futures" ]
-      [ "lazy_static" ]
-      [ "proc_macro" ]
-      [ "tokio" ]
-      [ "wasm" ]
-    ];
-    dependencies = {
-      async_trait = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".async-trait."0.1.57" { profileName = "__noProfile"; };
-      async_once = rustPackages."registry+https://github.com/rust-lang/crates.io-index".async_once."0.2.6" { inherit profileName; };
-      cached_proc_macro = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".cached_proc_macro."0.15.0" { profileName = "__noProfile"; };
-      cached_proc_macro_types = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cached_proc_macro_types."0.1.0" { inherit profileName; };
-      futures = rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures."0.3.23" { inherit profileName; };
-      hashbrown = rustPackages."registry+https://github.com/rust-lang/crates.io-index".hashbrown."0.12.3" { inherit profileName; };
-      instant = rustPackages."registry+https://github.com/rust-lang/crates.io-index".instant."0.1.12" { inherit profileName; };
-      lazy_static = rustPackages."registry+https://github.com/rust-lang/crates.io-index".lazy_static."1.4.0" { inherit profileName; };
-      once_cell = rustPackages."registry+https://github.com/rust-lang/crates.io-index".once_cell."1.13.1" { inherit profileName; };
-      thiserror = rustPackages."registry+https://github.com/rust-lang/crates.io-index".thiserror."1.0.32" { inherit profileName; };
-      tokio = rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.20.1" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".cached_proc_macro."0.15.0" = overridableMkRustCrate (profileName: rec {
-    name = "cached_proc_macro";
-    version = "0.15.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "751f7f4e7a091545e7f6c65bacc404eaee7e87bfb1f9ece234a1caa173dc16f2"; };
-    dependencies = {
-      cached_proc_macro_types = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cached_proc_macro_types."0.1.0" { inherit profileName; };
-      darling = rustPackages."registry+https://github.com/rust-lang/crates.io-index".darling."0.13.4" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".cached_proc_macro_types."0.1.0" = overridableMkRustCrate (profileName: rec {
-    name = "cached_proc_macro_types";
-    version = "0.1.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "3a4f925191b4367301851c6d99b09890311d74b0d43f274c0b34c86d308a3663"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".cfg-if."0.1.10" = overridableMkRustCrate (profileName: rec {
-    name = "cfg-if";
-    version = "0.1.10";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".cfg-if."1.0.0" = overridableMkRustCrate (profileName: rec {
-    name = "cfg-if";
-    version = "1.0.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".console_error_panic_hook."0.1.7" = overridableMkRustCrate (profileName: rec {
-    name = "console_error_panic_hook";
-    version = "0.1.7";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "a06aeb73f470f66dcdbf7223caeebb85984942f22f1adb2a088cf9668146bbbc"; };
-    dependencies = {
-      cfg_if = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."1.0.0" { inherit profileName; };
-      wasm_bindgen = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen."0.2.82" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".darling."0.13.4" = overridableMkRustCrate (profileName: rec {
-    name = "darling";
-    version = "0.13.4";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "a01d95850c592940db9b8194bc39f4bc0e89dee5c4265e4b1807c34a9aba453c"; };
-    features = builtins.concatLists [
-      [ "default" ]
-      [ "suggestions" ]
-    ];
-    dependencies = {
-      darling_core = rustPackages."registry+https://github.com/rust-lang/crates.io-index".darling_core."0.13.4" { inherit profileName; };
-      darling_macro = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".darling_macro."0.13.4" { profileName = "__noProfile"; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".darling_core."0.13.4" = overridableMkRustCrate (profileName: rec {
-    name = "darling_core";
-    version = "0.13.4";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "859d65a907b6852c9361e3185c862aae7fafd2887876799fa55f5f99dc40d610"; };
-    features = builtins.concatLists [
-      [ "strsim" ]
-      [ "suggestions" ]
-    ];
-    dependencies = {
-      fnv = rustPackages."registry+https://github.com/rust-lang/crates.io-index".fnv."1.0.7" { inherit profileName; };
-      ident_case = rustPackages."registry+https://github.com/rust-lang/crates.io-index".ident_case."1.0.1" { inherit profileName; };
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      strsim = rustPackages."registry+https://github.com/rust-lang/crates.io-index".strsim."0.10.0" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".darling_macro."0.13.4" = overridableMkRustCrate (profileName: rec {
-    name = "darling_macro";
-    version = "0.13.4";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "9c972679f83bdf9c42bd905396b6c3588a843a17f0f16dfcfa3e2c5d57441835"; };
-    dependencies = {
-      darling_core = rustPackages."registry+https://github.com/rust-lang/crates.io-index".darling_core."0.13.4" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".env_logger."0.8.4" = overridableMkRustCrate (profileName: rec {
-    name = "env_logger";
-    version = "0.8.4";
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-    ];
-    dependencies = {
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      unicode_ident = rustPackages."registry+https://github.com/rust-lang/crates.io-index".unicode-ident."1.0.3" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".thiserror."1.0.32" = overridableMkRustCrate (profileName: rec {
-    name = "thiserror";
-    version = "1.0.32";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "f5f6586b7f764adc0231f4c79be7b920e766bb2f3e51b3661cdb263828f19994"; };
-    dependencies = {
-      thiserror_impl = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".thiserror-impl."1.0.32" { profileName = "__noProfile"; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".thiserror-impl."1.0.32" = overridableMkRustCrate (profileName: rec {
-    name = "thiserror-impl";
-    version = "1.0.32";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "12bafc5b54507e0149cdf1b145a5d80ab80a90bcd9275df43d4fff68460f6c21"; };
-    dependencies = {
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".tokio."1.20.1" = overridableMkRustCrate (profileName: rec {
-    name = "tokio";
-    version = "1.20.1";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "7a8325f63a7d4774dd041e363b2409ed1c5cbbd0f867795e661df066b2b0a581"; };
-    features = builtins.concatLists [
-      [ "default" ]
-      [ "macros" ]
-      [ "num_cpus" ]
-      [ "once_cell" ]
-      [ "rt" ]
-      [ "rt-multi-thread" ]
-      [ "sync" ]
-      [ "time" ]
-      [ "tokio-macros" ]
-    ];
-    dependencies = {
-      num_cpus = rustPackages."registry+https://github.com/rust-lang/crates.io-index".num_cpus."1.13.1" { inherit profileName; };
-      once_cell = rustPackages."registry+https://github.com/rust-lang/crates.io-index".once_cell."1.13.1" { inherit profileName; };
-      pin_project_lite = rustPackages."registry+https://github.com/rust-lang/crates.io-index".pin-project-lite."0.2.9" { inherit profileName; };
-      tokio_macros = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio-macros."1.8.0" { profileName = "__noProfile"; };
-    };
-    buildDependencies = {
-      autocfg = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".autocfg."1.1.0" { profileName = "__noProfile"; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".tokio-macros."1.8.0" = overridableMkRustCrate (profileName: rec {
-    name = "tokio-macros";
-    version = "1.8.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "9724f9a975fb987ef7a3cd9be0350edcbe130698af5b8f7a631e23d42d052484"; };
-    dependencies = {
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".unicode-ident."1.0.3" = overridableMkRustCrate (profileName: rec {
-    name = "unicode-ident";
-    version = "1.0.3";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "c4f5b37a154999a8f3f98cc23a628d850e154479cd94decf3414696e12e31aaf"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".unicode-xid."0.1.0" = overridableMkRustCrate (profileName: rec {
-    name = "unicode-xid";
-    version = "0.1.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"; };
-    features = builtins.concatLists [
-      [ "default" ]
-    ];
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasi."0.11.0+wasi-snapshot-preview1" = overridableMkRustCrate (profileName: rec {
-    name = "wasi";
-    version = "0.11.0+wasi-snapshot-preview1";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"; };
-    features = builtins.concatLists [
-      [ "default" ]
-      [ "std" ]
-    ];
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen."0.2.82" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen";
-    version = "0.2.82";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "fc7652e3f6c4706c8d9cd54832c4a4ccb9b5336e2c3bd154d5cccfbf1c1f5f7d"; };
-    features = builtins.concatLists [
-      [ "default" ]
-      [ "serde" ]
-      [ "serde-serialize" ]
-      [ "serde_json" ]
-      [ "spans" ]
-      [ "std" ]
-    ];
-    dependencies = {
-      cfg_if = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."1.0.0" { inherit profileName; };
-      serde = rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.143" { inherit profileName; };
-      serde_json = rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_json."1.0.83" { inherit profileName; };
-      wasm_bindgen_macro = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-macro."0.2.82" { profileName = "__noProfile"; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-backend."0.2.82" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-backend";
-    version = "0.2.82";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "662cd44805586bd52971b9586b1df85cdbbd9112e4ef4d8f41559c334dc6ac3f"; };
-    features = builtins.concatLists [
-      [ "spans" ]
-    ];
-    dependencies = {
-      bumpalo = rustPackages."registry+https://github.com/rust-lang/crates.io-index".bumpalo."3.10.0" { inherit profileName; };
-      log = rustPackages."registry+https://github.com/rust-lang/crates.io-index".log."0.4.17" { inherit profileName; };
-      once_cell = rustPackages."registry+https://github.com/rust-lang/crates.io-index".once_cell."1.13.1" { inherit profileName; };
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-      wasm_bindgen_shared = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-shared."0.2.82" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-futures."0.3.27" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-futures";
-    version = "0.3.27";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "83420b37346c311b9ed822af41ec2e82839bfe99867ec6c54e2da43b7538771c"; };
-    dependencies = {
-      cfg_if = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."0.1.10" { inherit profileName; };
-      futures = rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures."0.1.31" { inherit profileName; };
-      js_sys = rustPackages."registry+https://github.com/rust-lang/crates.io-index".js-sys."0.3.59" { inherit profileName; };
-      wasm_bindgen = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen."0.2.82" { inherit profileName; };
-      ${ if builtins.elem "atomics" hostPlatformFeatures then "web_sys" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".web-sys."0.3.59" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-macro."0.2.82" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-macro";
-    version = "0.2.82";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "b260f13d3012071dfb1512849c033b1925038373aea48ced3012c09df952c602"; };
-    features = builtins.concatLists [
-      [ "spans" ]
-    ];
-    dependencies = {
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      wasm_bindgen_macro_support = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-macro-support."0.2.82" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-macro-support."0.2.82" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-macro-support";
-    version = "0.2.82";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "5be8e654bdd9b79216c2929ab90721aa82faf65c48cdf08bdc4e7f51357b80da"; };
-    features = builtins.concatLists [
-      [ "spans" ]
-    ];
-    dependencies = {
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."1.0.43" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."1.0.21" { inherit profileName; };
-      syn = rustPackages."registry+https://github.com/rust-lang/crates.io-index".syn."1.0.99" { inherit profileName; };
-      wasm_bindgen_backend = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-backend."0.2.82" { inherit profileName; };
-      wasm_bindgen_shared = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-shared."0.2.82" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-shared."0.2.82" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-shared";
-    version = "0.2.82";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "6598dd0bd3c7d51095ff6531a5b23e02acdc81804e30d8f07afb77b7215a140a"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-test."0.2.50" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-test";
-    version = "0.2.50";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "a2d9693b63a742d481c7f80587e057920e568317b2806988c59cd71618bc26c1"; };
-    dependencies = {
-      console_error_panic_hook = rustPackages."registry+https://github.com/rust-lang/crates.io-index".console_error_panic_hook."0.1.7" { inherit profileName; };
-      futures = rustPackages."registry+https://github.com/rust-lang/crates.io-index".futures."0.1.31" { inherit profileName; };
-      js_sys = rustPackages."registry+https://github.com/rust-lang/crates.io-index".js-sys."0.3.59" { inherit profileName; };
-      scoped_tls = rustPackages."registry+https://github.com/rust-lang/crates.io-index".scoped-tls."1.0.0" { inherit profileName; };
-      wasm_bindgen = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen."0.2.82" { inherit profileName; };
-      wasm_bindgen_futures = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-futures."0.3.27" { inherit profileName; };
-      wasm_bindgen_test_macro = buildRustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-test-macro."0.2.50" { profileName = "__noProfile"; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen-test-macro."0.2.50" = overridableMkRustCrate (profileName: rec {
-    name = "wasm-bindgen-test-macro";
-    version = "0.2.50";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "0789dac148a8840bbcf9efe13905463b733fa96543bfbf263790535c11af7ba5"; };
-    dependencies = {
-      proc_macro2 = rustPackages."registry+https://github.com/rust-lang/crates.io-index".proc-macro2."0.4.30" { inherit profileName; };
-      quote = rustPackages."registry+https://github.com/rust-lang/crates.io-index".quote."0.6.13" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".web-sys."0.3.59" = overridableMkRustCrate (profileName: rec {
-    name = "web-sys";
-    version = "0.3.59";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "ed055ab27f941423197eb86b2035720b1a3ce40504df082cac2ecc6ed73335a1"; };
-    features = builtins.concatLists [
-      [ "Event" ]
-      [ "EventTarget" ]
-      [ "MessageEvent" ]
-      [ "Performance" ]
-      [ "PerformanceTiming" ]
-      [ "Window" ]
-      [ "Worker" ]
-      [ "console" ]
-    ];
-    dependencies = {
-      js_sys = rustPackages."registry+https://github.com/rust-lang/crates.io-index".js-sys."0.3.59" { inherit profileName; };
-      wasm_bindgen = rustPackages."registry+https://github.com/rust-lang/crates.io-index".wasm-bindgen."0.2.82" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".wee_alloc."0.4.5" = overridableMkRustCrate (profileName: rec {
-    name = "wee_alloc";
-    version = "0.4.5";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "dbb3b5a6b2bb17cb6ad44a2e68a43e8d2722c997da10e928665c72ec6c0a0b8e"; };
-    features = builtins.concatLists [
-      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "default")
-      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "size_classes")
-    ];
-    dependencies = {
-      ${ if rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc" then "cfg_if" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".cfg-if."0.1.10" { inherit profileName; };
-      ${ if (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") && hostPlatform.isUnix && !(hostPlatform.parsed.cpu.name == "wasm32") then "libc" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".libc."0.2.132" { inherit profileName; };
-      ${ if rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc" then "memory_units" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".memory_units."0.4.0" { inherit profileName; };
-      ${ if (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") && hostPlatform.parsed.kernel.name == "windows" then "winapi" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".winapi."0.3.9" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".winapi."0.3.9" = overridableMkRustCrate (profileName: rec {
-    name = "winapi";
-    version = "0.3.9";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"; };
-    features = builtins.concatLists [
-      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "memoryapi")
-      [ "minwindef" ]
-      [ "ntsecapi" ]
-      [ "profileapi" ]
-      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "synchapi")
-      (lib.optional (rootFeatures' ? "quri_squiggle_mc/default" || rootFeatures' ? "quri_squiggle_mc/wee_alloc") "winbase")
-      [ "winnt" ]
-    ];
-    dependencies = {
-      ${ if hostPlatform.config == "i686-pc-windows-gnu" then "winapi_i686_pc_windows_gnu" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".winapi-i686-pc-windows-gnu."0.4.0" { inherit profileName; };
-      ${ if hostPlatform.config == "x86_64-pc-windows-gnu" then "winapi_x86_64_pc_windows_gnu" else null } = rustPackages."registry+https://github.com/rust-lang/crates.io-index".winapi-x86_64-pc-windows-gnu."0.4.0" { inherit profileName; };
-    };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".winapi-i686-pc-windows-gnu."0.4.0" = overridableMkRustCrate (profileName: rec {
-    name = "winapi-i686-pc-windows-gnu";
-    version = "0.4.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"; };
-  });
-  
-  "registry+https://github.com/rust-lang/crates.io-index".winapi-x86_64-pc-windows-gnu."0.4.0" = overridableMkRustCrate (profileName: rec {
-    name = "winapi-x86_64-pc-windows-gnu";
-    version = "0.4.0";
-    registry = "registry+https://github.com/rust-lang/crates.io-index";
-    src = fetchCratesIo { inherit name version; sha256 = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"; };
-  });
-  
-}
diff --git a/packages/mc/Cargo.toml b/packages/mc/Cargo.toml
index 253cf3aa..325f1307 100644
--- a/packages/mc/Cargo.toml
+++ b/packages/mc/Cargo.toml
@@ -33,13 +33,15 @@ default = ["wee_alloc"]
 [dependencies]
 # The `wasm-bindgen` crate provides the bare minimum functionality needed
 # to interact with JavaScript.
-wasm-bindgen = { version = "0.2.82", features = ["serde-serialize"] }
+wasm-bindgen = { version = "=0.2.79", features = ["serde-serialize"] }
 serde = { version = "1", features = ["derive"] }
+serde-wasm-bindgen = "0.4.3"
 
 # The `web-sys` crate allows you to interact with the various browser APIs,
 # like the DOM.
-web-sys = { version = "0.3.59", features = ["console"] }
+web-sys = { version = "0.3", features = ["console"] }
 
+js-sys = "0.3.22"
 # `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
 # compared to the default allocator's ~10K. However, it is slower than the default
 # allocator, so it's not enabled by default.
@@ -47,12 +49,12 @@ wee_alloc = { version = "0.4.2", optional = true }
 
 # Numerical things
 rand = "0.8.5"
-getrandom = { version = "0.2", features = ["js"] }
-rand_distr = "0.4.3"
+getrandom = { version = "0.2.7", features = ["js"] }
+# rand_distr = "0.4.3"
 statistics = "0.4.1"
 kernel_density = { git = "https://github.com/daithiocrualaoich/kernel_density" }
 cached = { version = "0.38.0", features = ["wasm"] }
-
+# instant = { git = "https://github.com/sebcrozet/instant", features = ["wasm-bindgen"] }
 # The `console_error_panic_hook` crate provides better debugging of panics by
 # logging them with `console.error`. This is great for development, but requires
 # all the `std::fmt` and `std::panicking` infrastructure, so it's only enabled
@@ -64,7 +66,6 @@ console_error_panic_hook = "0.1.5"
 [dev-dependencies]
 wasm-bindgen-test = "0.2.45"
 futures = "0.1.27"
-js-sys = "0.3.22"
 wasm-bindgen-futures = "0.3.22"
 quickcheck = "1"
 quickcheck_macros = "1"
diff --git a/packages/mc/README.md b/packages/mc/README.md
index 171f5efa..8008150b 100644
--- a/packages/mc/README.md
+++ b/packages/mc/README.md
@@ -1,54 +1,17 @@
-# `@quri/squiggle-mc` - parallel Monte Carlo with memoization for the `@quri/squiggle-lang` javascript interface
+# `@quri/squiggle-mc` - (hope to be) parallel Monte Carlo with memoization for the `@quri/squiggle-lang` javascript interface
 
 ## How to install
 
-Please run `yarn` at the monorepo level. 
+Please run `yarn` at the monorepo level.
 
-In this subrepo, please run `./cargo-refresh-nix.sh` every time `Cargo.toml`/`Cargo.lock` is modified, it requires nix with flakes. 
+Please view `/.github/workflows/ci.yml` for the most accurate story about how to build in concert with the rest of the packages in the monorepo.
 
-Please view `/.github/workflows/ci.yml` for the most accurate story about how to build in concert with the rest of the packages in the monorepo. 
+`nix develop` will set you up quite well. Rust versions for `wasm-pack` and so on could be a pain.
 
-## How to run in debug mode
+The build you need for the `squiggle-lang` package:
 
 ```sh
-# Builds the project and opens it in a new browser tab. Auto-reloads when the project changes.
-yarn start
+wasm-pack build --target nodejs
 ```
 
-## How to build in release mode
-
-```sh
-# Builds the project and places it into the `dist` folder.
-yarn build
-```
-
-## How to run unit tests
-
-These are the headless browser tests, which will attempt to download and install drivers, and may fail. 
-
-```sh
-# Runs tests in Firefox
-yarn test -- --firefox
-
-# Runs tests in Chrome
-yarn test -- --chrome
-
-# Runs tests in Safari
-yarn test -- --safari
-```
-
-## What does each file do?
-
-* `Cargo.toml` contains the standard Rust metadata. You put your Rust dependencies in here. You must change this file with your details (name, description, version, authors, categories)
-
-* `package.json` contains the standard npm metadata. You put your JavaScript dependencies in here. You must change this file with your details (author, name, version)
-
-* `webpack.config.js` contains the Webpack configuration. You shouldn't need to change this, unless you have very special needs.
-
-* The `js` folder contains your JavaScript code (`index.js` is used to hook everything into Webpack, you don't need to change it).
-
-* The `src` folder contains your Rust code.
-
-* The `static` folder contains any files that you want copied as-is into the final build. It contains an `index.html` file which loads the `index.js` file.
-
-* The `tests` folder contains your Rust unit tests.
+the `webpack`/`package.json`/`static` is not active and will be deleted at some point.
diff --git a/packages/mc/cargo-refresh-nix.sh b/packages/mc/cargo-refresh-nix.sh
deleted file mode 100755
index 0437d6b6..00000000
--- a/packages/mc/cargo-refresh-nix.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/usr/bin/env bash
-nix run github:cargo2nix/cargo2nix
diff --git a/packages/mc/src/distribution/monte_carlo.rs b/packages/mc/src/distribution/monte_carlo.rs
index ef625fe9..92d60535 100644
--- a/packages/mc/src/distribution/monte_carlo.rs
+++ b/packages/mc/src/distribution/monte_carlo.rs
@@ -1,34 +1,51 @@
 use wasm_bindgen::prelude::*;
+use js_sys::Float64Array;
 use rand::Rng;
 use rand::thread_rng;
 use kernel_density::kde;
-use serde::Serialize;
-use crate::distribution::bandwidth::{nrd0, nrd};
+use serde::{Serialize, Deserialize};
+// use crate::distribution::bandwidth::{nrd0, nrd};
 
 // TODO: impl a constructor such that xs.len() == ys.len().
 #[wasm_bindgen]
-#[derive(Serialize)]
+#[derive(Serialize, Deserialize)]
 pub struct PdfCurve {
     xs: Vec<f64>,
     ys: Vec<f64>,
 }
 
-pub fn samples_to_continuous_pdf(samples: Vec<f64>, bandwidth: f64) -> JsValue {
-    let samples_to_map = samples.clone();
-    let pdf = kde::normal(&samples, bandwidth);
-    let pdf_curve = PdfCurve {
-        xs: samples,
-        ys: samples_to_map.iter().map(|x| pdf.density(*x)).collect(),
-    };
-    JsValue::from_serde::<PdfCurve>(&pdf_curve).unwrap()
+#[wasm_bindgen]
+impl PdfCurve {
+    #[wasm_bindgen(constructor)]
+    pub fn new(xs: Vec<f64>, ys: Vec<f64>) -> Result<PdfCurve, String> {
+        let mut sorted_zip: Vec<(&f64, &f64)> = xs.iter().zip(ys.iter()).collect();
+        sorted_zip.sort_by(|a, b| a.0.partial_cmp(b.0).unwrap()); // Will panic if there are any NaN.
+        return match xs.len() != ys.len() {
+            true => return Err("error: xs and ys are not the same length".to_string()),
+            false => {
+                let xs: Vec<f64> = sorted_zip.iter().map(|a| *a.0).collect();
+                let ys: Vec<f64> = sorted_zip.iter().map(|b| *b.1).collect();
+                Ok(PdfCurve { xs: xs, ys: ys })
+            },
+        }
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn xs(&self) -> Float64Array {
+        Float64Array::from(&self.xs[..])
+    }
+    #[wasm_bindgen(getter)]
+    pub fn ys(&self) -> Float64Array {
+        Float64Array::from(&self.ys[..])
+    }
 }
 
-// pub fn get_curve(samples: Vec<f64>, n: u64) -> Vec<f64> {
-//     let bandwidth = nrd(&samples);
-//     let curve = samples_to_continuous_pdf(samples, bandwidth);
-//     return curve.ys;
-// }
-
+pub fn samples_to_continuous_pdf(samples: Vec<f64>, bandwidth: f64) -> PdfCurve {
+    let samples_to_map = samples.clone();
+    let pdf = kde::normal(&samples, bandwidth);
+    let pdf_curve = PdfCurve::new(samples, samples_to_map.iter().map(|x| pdf.density(*x)).collect());
+    pdf_curve.unwrap()
+}
 
 pub fn sample_n(xs: Vec<f32>, n: i32) -> Vec<f32> {
     let m = xs.len();
diff --git a/packages/mc/src/lib.rs b/packages/mc/src/lib.rs
index 201a2559..47e961fe 100644
--- a/packages/mc/src/lib.rs
+++ b/packages/mc/src/lib.rs
@@ -1,7 +1,7 @@
 use wasm_bindgen::prelude::*;
-use web_sys::console;
+use serde_wasm_bindgen;
 mod distribution;
-use distribution::{monte_carlo, bandwidth};
+use distribution::monte_carlo;
 
 // When the `wee_alloc` feature is enabled, this uses `wee_alloc` as the global
 // allocator.
@@ -17,14 +17,15 @@ pub fn sample_n(samples: Box<[f32]>, num_samples: i32) -> Vec<f32> {
     console_error_panic_hook::set_once();
     let samples_vec = Vec::from(samples);
 
-    return monte_carlo::sample_n(samples_vec, num_samples);
+    monte_carlo::sample_n(samples_vec, num_samples)
 }
 
-#[wasm_bindgen]
-pub fn samples_to_continuous_pdf(samples: Box<[f64]>, bandwidth: f64) -> JsValue {
-    #[cfg(debug_assertions)]
-    console_error_panic_hook::set_once();
-
-    let samples_vec = Vec::from(samples);
-    monte_carlo::samples_to_continuous_pdf(samples_vec, bandwidth)
-}
+// #[wasm_bindgen]
+// pub fn samples_to_continuous_pdf(samples: Box<[f64]>, bandwidth: f64) -> JsValue {
+//    #[cfg(debug_assertions)]
+//    console_error_panic_hook::set_once();
+//
+//    let samples_vec = Vec::from(samples);
+//    let pdf = monte_carlo::samples_to_continuous_pdf(samples_vec, bandwidth);
+//    serde_wasm_bindgen::to_value(&pdf).unwrap()
+//}
diff --git a/packages/mc/static/index.html b/packages/mc/static/index.html
index 2a4fb04d..30dc8009 100644
--- a/packages/mc/static/index.html
+++ b/packages/mc/static/index.html
@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <meta charset="UTF-8">
+    <meta charset="UTF-8" />
     <title>For developing squiggle-mc</title>
   </head>
   <body>
diff --git a/packages/mc/webpack.config.js b/packages/mc/webpack.config.js
index b8bb656f..9ef6c758 100644
--- a/packages/mc/webpack.config.js
+++ b/packages/mc/webpack.config.js
@@ -27,7 +27,7 @@ module.exports = {
     }),
   ],
   resolve: {
-    extensions: [".tsx", ".ts", ".js"]
+    extensions: [".tsx", ".ts", ".js"],
   },
   experiments: {
     asyncWebAssembly: true,