chore: remove third_party submodule (#20201)

removes third_party submodule, tools are installed on-demand.

- removed `load_test` and websocket benchmark (covered by benchy)
- removed node/bun http benchmarks (covered by benchy)
- `dlint` & `dprint` downloaded on-demand. 
- `wrk` & `hyperfine` downloaded before CI benchmark run. 
   Install locally using: `./tools/install_prebuilt.js wrk hyperfine`

#### updating dlint/dprint

update version in `tools/util.js` and place binary in
`denoland/deno_third_party`.

.github/workflows/ci.generate.ts

@@ -65,8 +65,8 @@ sudo mount --rbind /sys /sysroot/sys
 sudo mount --rbind /home /sysroot/home
 sudo mount -t proc /proc /sysroot/proc
 
-cp third_party/prebuilt/linux64/libdl/libdl.so.2 .
+wget https://github.com/denoland/deno_third_party/raw/master/prebuilt/linux64/libdl/libdl.a
-cp third_party/prebuilt/linux64/libdl/libdl.a .
+wget https://github.com/denoland/deno_third_party/raw/master/prebuilt/linux64/libdl/libdl.so.2
 
 sudo ln -s libdl.so.2 /sysroot/lib/x86_64-linux-gnu/libdl.so
 sudo ln -s libdl.a /sysroot/lib/x86_64-linux-gnu/libdl.a
@@ -106,6 +106,8 @@ CFLAGS=-flto=thin --sysroot=/sysroot
 __0`,
 };
 
+const installBenchTools = "./tools/install_prebuilt.js wrk hyperfine";
+
 // The Windows builder is a little strange -- there's lots of room on C: and not so much on D:
 // We'll check out to D:, but then all of our builds should happen on a C:-mapped drive
 const reconfigureWindowsStorage = {
@@ -395,7 +397,6 @@ const ci = {
         reconfigureWindowsStorage,
         ...cloneRepoStep,
         submoduleStep("./test_util/std"),
-        submoduleStep("./third_party"),
         {
           ...submoduleStep("./test_util/wpt"),
           if: "matrix.wpt",
@@ -504,6 +505,8 @@ const ci = {
             'if [ "${{ matrix.job }}" == "bench" ]',
             "then",
             "  node -v",
+            // Install benchmark tools.
+            installBenchTools,
             "fi",
           ].join("\n"),
         },
@@ -552,7 +555,7 @@ const ci = {
           name: "test_format.js",
           if: "matrix.job == 'lint' && startsWith(matrix.os, 'ubuntu')",
           run:
-            "deno run --unstable --allow-write --allow-read --allow-run ./tools/format.js --check",
+            "deno run --unstable --allow-write --allow-read --allow-run --allow-net ./tools/format.js --check",
         },
         {
           name: "Lint PR title",
@@ -567,7 +570,7 @@ const ci = {
           name: "lint.js",
           if: "matrix.job == 'lint'",
           run:
-            "deno run --unstable --allow-write --allow-read --allow-run ./tools/lint.js",
+            "deno run --unstable --allow-write --allow-read --allow-run --allow-net ./tools/lint.js",
         },
         {
           name: "node_compat/setup.ts --check",

.github/workflows/ci.yml

@@ -128,9 +128,6 @@ jobs:
       - name: Clone submodule ./test_util/std
         run: git submodule update --init --recursive --depth=1 -- ./test_util/std
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr)'
-      - name: Clone submodule ./third_party
-        run: git submodule update --init --recursive --depth=1 -- ./third_party
-        if: '!(github.event_name == ''pull_request'' && matrix.skip_pr)'
       - name: Clone submodule ./test_util/wpt
         run: git submodule update --init --recursive --depth=1 -- ./test_util/wpt
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr) && (matrix.wpt)'
@@ -252,8 +249,8 @@ jobs:
           sudo mount --rbind /home /sysroot/home
           sudo mount -t proc /proc /sysroot/proc
 
-          cp third_party/prebuilt/linux64/libdl/libdl.so.2 .
+          wget https://github.com/denoland/deno_third_party/raw/master/prebuilt/linux64/libdl/libdl.a
-          cp third_party/prebuilt/linux64/libdl/libdl.a .
+          wget https://github.com/denoland/deno_third_party/raw/master/prebuilt/linux64/libdl/libdl.so.2
 
           sudo ln -s libdl.so.2 /sysroot/lib/x86_64-linux-gnu/libdl.so
           sudo ln -s libdl.a /sysroot/lib/x86_64-linux-gnu/libdl.a
@@ -303,6 +300,7 @@ jobs:
           if [ "${{ matrix.job }}" == "bench" ]
           then
             node -v
+          ./tools/install_prebuilt.js wrk hyperfine
           fi
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr)'
       - name: Cache Cargo home
@@ -332,7 +330,7 @@ jobs:
           cache-path: ./target
       - name: test_format.js
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr) && (matrix.job == ''lint'' && startsWith(matrix.os, ''ubuntu''))'
-        run: deno run --unstable --allow-write --allow-read --allow-run ./tools/format.js --check
+        run: deno run --unstable --allow-write --allow-read --allow-run --allow-net ./tools/format.js --check
       - name: Lint PR title
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr) && (matrix.job == ''lint'' && github.event_name == ''pull_request'' && startsWith(matrix.os, ''ubuntu''))'
         env:
@@ -340,7 +338,7 @@ jobs:
         run: deno run ./tools/verify_pr_title.js "$PR_TITLE"
       - name: lint.js
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr) && (matrix.job == ''lint'')'
-        run: deno run --unstable --allow-write --allow-read --allow-run ./tools/lint.js
+        run: deno run --unstable --allow-write --allow-read --allow-run --allow-net ./tools/lint.js
       - name: node_compat/setup.ts --check
         if: '!(github.event_name == ''pull_request'' && matrix.skip_pr) && (matrix.job == ''lint'' && startsWith(matrix.os, ''ubuntu''))'
         run: deno run --allow-write --allow-read --allow-run=git ./tools/node_compat/setup.ts --check

.gitignore

@@ -11,6 +11,7 @@ gclient_config.py_entries
 /target/
 /std/hash/_wasm/target
 /tools/wpt/manifest.json
+/third_party/
 /test_napi/node_modules
 /test_napi/build
 /test_napi/third_party_tests/node_modules

.gitmodules

@@ -1,7 +1,3 @@
-[submodule "deno_third_party"]
-	path = third_party
-	url = https://github.com/denoland/deno_third_party.git
-	shallow = true
 [submodule "test_util/std"]
 	path = test_util/std
 	url = https://github.com/denoland/deno_std

cli/bench/http.rs

@@ -38,7 +38,6 @@ pub fn benchmark(
     if path.ends_with(".lua") {
       continue;
     }
-    let name = entry.file_name().into_string().unwrap();
     let file_stem = pathbuf.file_stem().unwrap().to_str().unwrap();
 
     let lua_script = http_dir.join(format!("{file_stem}.lua"));
@@ -48,65 +47,25 @@ pub fn benchmark(
     }
 
     let port = get_port();
-    if name.starts_with("node") {
+    // deno run -A --unstable <path> <addr>
-      // node <path> <port>
+    res.insert(
-      res.insert(
+      file_stem.to_string(),
-        file_stem.to_string(),
+      run(
-        run(
+        &[
-          &["node", path, &port.to_string()],
+          deno_exe.as_str(),
-          port,
+          "run",
-          None,
+          "--allow-all",
-          None,
+          "--unstable",
-          maybe_lua,
+          "--enable-testing-features-do-not-use",
-        )?,
+          path,
-      );
+          &server_addr(port),
-    } else if name.starts_with("bun") && !cfg!(target_os = "windows") {
+        ],
-      // Bun does not support Windows.
+        port,
-      #[cfg(target_arch = "x86_64")]
+        None,
-      #[cfg(not(target_vendor = "apple"))]
+        None,
-      let bun_exe = test_util::prebuilt_tool_path("bun");
+        maybe_lua,
-      #[cfg(target_vendor = "apple")]
+      )?,
-      #[cfg(target_arch = "x86_64")]
+    );
-      let bun_exe = test_util::prebuilt_tool_path("bun-x64");
-      #[cfg(target_vendor = "apple")]
-      #[cfg(target_arch = "aarch64")]
-      let bun_exe = test_util::prebuilt_tool_path("bun-aarch64");
-      #[cfg(target_os = "linux")]
-      #[cfg(target_arch = "aarch64")]
-      let bun_exe = test_util::prebuilt_tool_path("bun-aarch64");
-
-      // bun <path> <port>
-      res.insert(
-        file_stem.to_string(),
-        run(
-          &[&bun_exe.to_string(), path, &port.to_string()],
-          port,
-          None,
-          None,
-          maybe_lua,
-        )?,
-      );
-    } else {
-      // deno run -A --unstable <path> <addr>
-      res.insert(
-        file_stem.to_string(),
-        run(
-          &[
-            deno_exe.as_str(),
-            "run",
-            "--allow-all",
-            "--unstable",
-            "--enable-testing-features-do-not-use",
-            path,
-            &server_addr(port),
-          ],
-          port,
-          None,
-          None,
-          maybe_lua,
-        )?,
-      );
-    }
   }
 
   res.insert("hyper".to_string(), hyper_http(hyper_hello_exe)?);

cli/bench/http/bun_hono_router.js

@@ -1,17 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const port = Bun.argv[2] || "4545";
-const { Hono } = require("../testdata/npm/hono/dist/index.js");
-
-const app = new Hono();
-app.use("*", async (c, n) => {
-  c.res.headers.set("Date", (new Date()).toUTCString());
-  await n();
-});
-app.get("/", (c) => c.text("Hello, World!"));
-
-Bun.serve({
-  fetch(r) {
-    return app.fetch(r);
-  },
-  port: Number(port),
-});

cli/bench/http/bun_http.js

@@ -1,10 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const port = Bun.argv[2] || "4545";
-Bun.serve({
-  fetch(_req) {
-    return new Response("Hello World", {
-      headers: { "Date": (new Date()).toUTCString() },
-    });
-  },
-  port: Number(port),
-});

cli/bench/http/bun_http_send_file.js

@@ -1,14 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const port = Bun.argv[2] || "4545";
-
-const path = new URL("../testdata/128k.bin", import.meta.url).pathname;
-
-Bun.serve({
-  fetch(_req) {
-    const file = Bun.file(path);
-    return new Response(file, {
-      headers: { "Date": (new Date()).toUTCString() },
-    });
-  },
-  port: Number(port),
-});

cli/bench/http/node_http.js

@@ -1,9 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const http = require("http");
-const port = process.argv[2] || "4544";
-console.log("port", port);
-http
-  .Server((req, res) => {
-    res.end("Hello World");
-  })
-  .listen(port);

cli/bench/http/node_http_read_headers.js

@@ -1,10 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const http = require("http");
-const port = process.argv[2] || "4544";
-console.log("port", port);
-http
-  .Server((req, res) => {
-    const bar = req.headers["foo"];
-    res.end(bar);
-  })
-  .listen(port);

cli/bench/http/node_http_read_headers.lua

@@ -1,5 +0,0 @@
-wrk.headers["foo"] = "bar"
-wrk.headers["User-Agent"] = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36"
-wrk.headers["Viewport-Width"] = "1920"
-wrk.headers["Accept"] = "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"
-wrk.headers["Accept-Language"] = "en,la;q=0.9"

cli/bench/http/node_post_bin.js

@@ -1,18 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const http = require("http");
-const port = process.argv[2] || "4544";
-console.log("port", port);
-http
-  .Server((req, res) => {
-    if (req.method == "POST") {
-      let chunks = [];
-      req.on("data", function (data) {
-        chunks.push(data);
-      });
-      req.on("end", function () {
-        const buffer = Buffer.concat(chunks);
-        res.end(buffer.byteLength.toString());
-      });
-    }
-  })
-  .listen(port);

cli/bench/http/node_post_bin.lua

@@ -1,5 +0,0 @@
-wrk.method = "POST"
-wrk.headers["Content-Type"] = "application/octet-stream"
-
-file = io.open("./cli/bench/testdata/128k.bin", "rb")
-wrk.body = file:read("*a")

cli/bench/http/node_post_json.js

@@ -1,18 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-const http = require("http");
-const port = process.argv[2] || "4544";
-console.log("port", port);
-http
-  .Server((req, res) => {
-    if (req.method == "POST") {
-      let body = "";
-      req.on("data", function (data) {
-        body += data;
-      });
-      req.on("end", function () {
-        const { hello } = JSON.parse(body);
-        res.end(hello);
-      });
-    }
-  })
-  .listen(port);

cli/bench/http/node_post_json.lua

@@ -1,3 +0,0 @@
-wrk.method = "POST"
-wrk.headers["Content-Type"] = "application/json"
-wrk.body = '{"hello":"node"}'

cli/bench/http/node_tcp.js

@@ -1,18 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-// Note: this is a keep-alive server.
-const { Server } = require("net");
-const port = process.argv[2] || "4544";
-console.log("port", port);
-
-const response = Buffer.from(
-  "HTTP/1.1 200 OK\r\nContent-Length: 12\r\n\r\nHello World\n",
-);
-
-Server((socket) => {
-  socket.on("data", (_) => {
-    socket.write(response);
-  });
-  socket.on("error", (_) => {
-    socket.destroy();
-  });
-}).listen(port);

cli/bench/main.rs

@@ -18,7 +18,6 @@ include!("../util/time.rs");
 
 mod http;
 mod lsp;
-mod websocket;
 
 fn read_json(filename: &Path) -> Result<Value> {
   let f = fs::File::open(filename)?;
@@ -403,7 +402,6 @@ struct BenchResult {
   max_memory: HashMap<String, i64>,
   lsp_exec_time: HashMap<String, i64>,
   req_per_sec: HashMap<String, i64>,
-  ws_msg_per_sec: HashMap<String, f64>,
   syscall_count: HashMap<String, i64>,
   thread_count: HashMap<String, i64>,
 }
@@ -419,7 +417,6 @@ async fn main() -> Result<()> {
     "cargo_deps",
     "lsp",
     "http",
-    "websocket",
     "strace",
     "mem_usage",
   ];
@@ -459,11 +456,6 @@ async fn main() -> Result<()> {
     ..Default::default()
   };
 
-  if benchmarks.contains(&"websocket") {
-    let ws = websocket::benchmark()?;
-    new_data.ws_msg_per_sec = ws;
-  }
-
   if benchmarks.contains(&"bundle") {
     let bundle_size = bundle_benchmark(&deno_exe)?;
     new_data.bundle_size = bundle_size;

cli/bench/websocket.rs

@@ -1,76 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-use std::collections::HashMap;
-use std::io::BufRead;
-use std::path::Path;
-use std::process::Command;
-use std::process::Stdio;
-use std::time::Duration;
-
-use super::Result;
-
-pub fn benchmark() -> Result<HashMap<String, f64>> {
-  let deno_exe = test_util::deno_exe_path();
-
-  let mut res = HashMap::new();
-  let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
-  let ws_dir = manifest_dir.join("bench").join("websocket");
-  for entry in std::fs::read_dir(&ws_dir)? {
-    let port = crate::http::get_port();
-    let entry = entry?;
-    let pathbuf = entry.path();
-    let path = pathbuf.to_str().unwrap();
-    let file_stem = pathbuf.file_stem().unwrap().to_str().unwrap();
-
-    let mut cmd = Command::new(&deno_exe);
-    let mut server = cmd
-      .arg("run")
-      .arg("-A")
-      .arg("--unstable")
-      .arg(path)
-      .arg(&port.to_string())
-      .spawn()
-      .unwrap();
-
-    std::thread::sleep(Duration::from_secs(5)); // wait for server to wake up.
-
-    let load_test = test_util::prebuilt_tool_path("load_test");
-    assert!(load_test.is_file());
-    // ./load_test 100 0.0.0.0 8000 0 0
-    // Running benchmark now...
-    // Msg/sec: 161327.500000
-    // Msg/sec: 163977.000000
-    // ^C⏎
-    let mut cmd = Command::new(load_test);
-    let mut process = cmd
-      .stdout(Stdio::piped())
-      .arg("100")
-      .arg("0.0.0.0")
-      .arg(&port.to_string())
-      .arg("0")
-      .arg("0")
-      .spawn()
-      .unwrap();
-
-    let mut lines = Vec::new();
-
-    let mut stdout =
-      std::io::BufReader::new(process.stdout.take().unwrap()).lines();
-    for _ in 0..5 {
-      let line = stdout.next().unwrap().unwrap();
-      lines.push(line);
-    }
-
-    process.kill().unwrap();
-    let msg_per_sec = lines
-      .into_iter()
-      .filter(|line| line.starts_with("Msg/sec:"))
-      .map(|line| line.split(": ").nth(1).unwrap().parse::<f64>().unwrap())
-      .max_by(|a, b| a.partial_cmp(b).unwrap())
-      .unwrap();
-
-    res.insert(file_stem.to_string(), msg_per_sec);
-    server.kill().unwrap();
-  }
-
-  Ok(res)
-}

cli/bench/websocket/deno_echo.js

@@ -1,25 +0,0 @@
-// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-
-const port = Deno.args[0] ?? "8080";
-const { serve } = Deno;
-
-function handler(request) {
-  const { socket, response } = Deno.upgradeWebSocket(request, {
-    idleTimeout: 0,
-  });
-  socket.onmessage = (e) => {
-    socket.send(e.data);
-  };
-
-  socket.onopen = () => {
-    console.log("Connected to client");
-  };
-
-  socket.onerror = (e) => {
-    console.log(e);
-  };
-
-  return response;
-}
-
-serve({ port: parseInt(port), hostname: "0.0.0.0" }, handler);

third_party

@@ -1 +0,0 @@
-Subproject commit 7f1a41fee1bfbffd56674269db8f1e19263cf751

tools/format.js

@@ -1,10 +1,10 @@
-#!/usr/bin/env -S deno run --unstable --allow-write --allow-read --allow-run
+#!/usr/bin/env -S deno run --unstable --allow-write --allow-read --allow-run --allow-net
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-import { getPrebuiltToolPath, join, ROOT_PATH } from "./util.js";
+import { getPrebuilt, join, ROOT_PATH } from "./util.js";
 
 const subcommand = Deno.args.includes("--check") ? "check" : "fmt";
 const configFile = join(ROOT_PATH, ".dprint.json");
-const execPath = getPrebuiltToolPath("dprint");
+const execPath = await getPrebuilt("dprint");
 const cmd = new Deno.Command(execPath, {
   args: [subcommand, "--config=" + configFile],
   cwd: ROOT_PATH,

tools/install_prebuilt.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env -S deno run --unstable --allow-write --allow-read --allow-net
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { getPrebuilt } from "./util.js";
+
+const args = Deno.args.slice();
+for (const arg of args) {
+  await getPrebuilt(arg);
+}

tools/lint.js

@@ -1,12 +1,6 @@
-#!/usr/bin/env -S deno run --unstable --allow-write --allow-read --allow-run
+#!/usr/bin/env -S deno run --unstable --allow-write --allow-read --allow-run --allow-net
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
-import {
+import { buildMode, getPrebuilt, getSources, join, ROOT_PATH } from "./util.js";
-  buildMode,
-  getPrebuiltToolPath,
-  getSources,
-  join,
-  ROOT_PATH,
-} from "./util.js";
 import { checkCopyright } from "./copyright_checker.js";
 
 let didLint = false;
@@ -33,7 +27,7 @@ if (!didLint) {
 
 async function dlint() {
   const configFile = join(ROOT_PATH, ".dlint.json");
-  const execPath = getPrebuiltToolPath("dlint");
+  const execPath = await getPrebuilt("dlint");
 
   const sourceFiles = await getSources(ROOT_PATH, [
     "*.js",
@@ -41,7 +35,6 @@ async function dlint() {
     ":!:.github/mtime_cache/action.js",
     ":!:cli/tests/testdata/swc_syntax_error.ts",
     ":!:cli/tests/testdata/error_008_checkjs.js",
-    ":!:cli/bench/http/node*.js",
     ":!:cli/bench/testdata/npm/*",
     ":!:cli/bench/testdata/express-router.js",
     ":!:cli/bench/testdata/react-dom.js",
@@ -92,7 +85,7 @@ async function dlint() {
 // which is different from other lint rules. This is why this dedicated function
 // is needed.
 async function dlintPreferPrimordials() {
-  const execPath = getPrebuiltToolPath("dlint");
+  const execPath = await getPrebuilt("dlint");
   const sourceFiles = await getSources(ROOT_PATH, [
     "runtime/**/*.js",
     "ext/**/*.js",

tools/util.js

@@ -6,11 +6,18 @@ import {
   resolve,
   toFileUrl,
 } from "../test_util/std/path/mod.ts";
+import { wait } from "https://deno.land/x/wait@0.1.13/mod.ts";
 export { dirname, fromFileUrl, join, resolve, toFileUrl };
 export { existsSync, walk } from "../test_util/std/fs/mod.ts";
 export { TextLineStream } from "../test_util/std/streams/text_line_stream.ts";
 export { delay } from "../test_util/std/async/delay.ts";
 
+// [toolName] --version output
+const versions = {
+  "dprint": "dprint 0.40.0",
+  "dlint": "dlint 0.47.0",
+};
+
 export const ROOT_PATH = dirname(dirname(fromFileUrl(import.meta.url)));
 
 async function getFilesFromGit(baseDir, args) {
@@ -100,14 +107,82 @@ export function buildPath() {
   return join(ROOT_PATH, "target", buildMode());
 }
 
-export function getPrebuiltToolPath(toolName) {
+const platformDirName = {
-  const PREBUILT_PATH = join(ROOT_PATH, "third_party", "prebuilt");
+  "windows": "win",
+  "darwin": "mac",
+  "linux": "linux64",
+}[Deno.build.os];
 
-  const platformDirName = {
+const executableSuffix = Deno.build.os === "windows" ? ".exe" : "";
-    "windows": "win",
+
-    "darwin": "mac",
+export async function getPrebuilt(toolName) {
-    "linux": "linux64",
+  const toolPath = getPrebuiltToolPath(toolName);
-  }[Deno.build.os];
+  try {
-  const executableSuffix = Deno.build.os === "windows" ? ".exe" : "";
+    await Deno.stat(toolPath);
-  return join(PREBUILT_PATH, platformDirName, toolName + executableSuffix);
+    const versionOk = await verifyVersion(toolName);
+    if (!versionOk) {
+      throw new Error("Version mismatch");
+    }
+  } catch {
+    await downloadPrebuilt(toolName);
+  }
+
+  return toolPath;
+}
+
+const PREBUILT_PATH = join(ROOT_PATH, "third_party", "prebuilt");
+const PREBUILT_TOOL_DIR = join(PREBUILT_PATH, platformDirName);
+
+export function getPrebuiltToolPath(toolName) {
+  return join(PREBUILT_TOOL_DIR, toolName + executableSuffix);
+}
+
+const downloadUrl =
+  `https://raw.githubusercontent.com/denoland/deno_third_party/master/prebuilt/${platformDirName}`;
+
+export async function downloadPrebuilt(toolName) {
+  const spinner = wait("Downloading prebuilt tool: " + toolName).start();
+  const toolPath = getPrebuiltToolPath(toolName);
+
+  try {
+    await Deno.mkdir(PREBUILT_TOOL_DIR, { recursive: true });
+
+    const url = `${downloadUrl}/${toolName}${executableSuffix}`;
+
+    const resp = await fetch(url);
+    const file = await Deno.open(toolPath, {
+      create: true,
+      write: true,
+      mode: 0o755,
+    });
+
+    await resp.body.pipeTo(file.writable);
+  } catch (e) {
+    spinner.fail();
+    throw e;
+  }
+
+  spinner.succeed();
+}
+
+export async function verifyVersion(toolName) {
+  const requiredVersion = versions[toolName];
+  if (!requiredVersion) {
+    return true;
+  }
+
+  try {
+    const toolPath = getPrebuiltToolPath(toolName);
+    const cmd = new Deno.Command(toolPath, {
+      args: ["--version"],
+      stdout: "piped",
+      stderr: "inherit",
+    });
+    const output = await cmd.output();
+    const version = new TextDecoder().decode(output.stdout).trim();
+    return version == requiredVersion;
+  } catch (e) {
+    console.error(e);
+    return false;
+  }
 }