Deno 1.x to 2.x Migration Guide

While we’ve accomplished a ton in Deno 1.x, the next major version is focused on using Deno at scale. This means seamless interoperability with Node.js and npm JavaScript infrastructure and supporting a wider range of projects and development teams, all without sacrificing the simplicity, security, and “batteries included” nature that developers love.

Backwards compatibility with Node.js and npm Jump to heading

Deno 2 is backwards compatible with Node.js and npm. This allows you to not only run Deno in your current Node.js projects, but also incrementally adopt pieces of Deno's all-in-one toolchain.

For example you can use deno install on a Node.js project to install dependencies, run deno fmt to format code without needing Prettier, or use deno lint to checks for common pitfalls instead of using ESLint.

Deno 2 understands package.json, node_modules directory and even npm workspaces, allowing you to migrate your existing projects using ESM with little effort.

Long Term Support releases Jump to heading

Starting with Deno v2.1.0 (to be released in November 2024) Deno will offer a LTS (long-term support) channel.

An LTS version is supported for 6 months, receiving bug fixes and critical performance fixes, before a new version is promoted to LTS.

Managing dependencies Jump to heading

Deno 2 greatly improves dependency management for npm and JSR packages with tools like:

You can expect seemless experience with Deno-first projects using deno.json, Node.js-first project using package.json, as well as hybrid projects using both deno.json and package.json to enable easy migration path.

Monorepo, workspace and private registries support Jump to heading

Deno 2 was built with development teams working on mission-critical projects in mind. These team work on complex codebases, sharing internal code, often using private registries.

With Deno 2 your team can levarage private npm registries, the same way you'd do with Node.js and npm, using an .npmrc file:

.npmrc

@mycompany:registry=http://mycompany.com:8111/
mycompany.com:8111/:_authToken=token

Learn more about private registry configuration on npm packages page.

Deno 2 has workspace support, allowing you to mix Deno-first and Node-first packages in the same monorepo, making incremental adoption fast and approachable.

Framework support Jump to heading

With improved Node.js and npm compatibility, Deno 2 supports a plethora or user-favorite frameworks like:

Next.js
SvelteKit
Remix
Nuxt
TanStack
Qwik
and more

Most existing project should require minimal or no changes; just replace npm run dev with deno task dev and get on with your work.

Deno will provide helpful error messages with suggestions to guide you towards a working solution.

You can also use deno lint --fix to automatically fix common incompatibilies.

The following section outline CLI and API changes between Deno 1.x and Deno 2.

CLI changes Jump to heading

deno bundle

The deno bundle command has been removed. We recommend using esbuild together with esbuild-deno-loader.

import * as esbuild from "npm:esbuild";
import { denoPlugins } from "jsr:@luca/esbuild-deno-loader";

const result = await esbuild.build({
  plugins: [...denoPlugins()],
  entryPoints: ["https://deno.land/std@0.185.0/bytes/mod.ts"],
  outfile: "./dist/bytes.esm.js",
  bundle: true,
  format: "esm",
});

esbuild.stop();

deno cache

The deno cache command has been merged into the deno install command under the --entrypoint option.

- deno cache main.ts
+ deno install --entrypoint main.ts

deno vendor

The deno vendor command has been replaced by a "vendor": true configuration option in deno.json.

deno.json

{
  "vendor": true
}

--allow-none

Use the --permit-no-files CLI flag instead.

- deno test --allow-none
+ deno test --permit-no-files

--jobs

Use the DENO_JOBS environment variable instead.

- deno test --jobs=4 --parallel
+ DENO_JOBS=4 deno test --parallel

--ts

Use the --ext=ts CLI flag instead.

- deno run --ts script.ts
+ deno run --ext=ts script.ts

- deno run -T script.ts
+ deno run --ext=ts script.ts

--trace-ops

Use the --trace-leaks CLI flag instead.

- deno test --trace-ops
+ deno test --trace-leaks

--unstable

Use granular unstable flags (--unstable-*) or configuration options instead. See Unstable Feature Flags for reference.

// kv.ts
const kv = await Deno.openKv();

// ...

- deno run --unstable kv.ts
+ deno run --unstable-kv kv.ts

{
+ "unstable": ["kv"]
}

See the Deno 1.40 Blog Post for details.

API changes Jump to heading

Deno.Buffer

Use Buffer from the Standard Library instead.

+ import { Buffer } from "jsr:@std/io/buffer";

- const buffer = new Deno.Buffer();
+ const buffer = new Buffer();

  // ...

See deno#9795 for details.

Deno.Closer

Use Closer from the Standard Library instead.

+ import type { Closer } from "jsr:@std/io/types";

- function foo(closer: Deno.Closer) {
+ function foo(closer: Closer) {
  // ...  
}

See deno#9795 for details.

Deno.close()

Use the .close() method on the resource instead.

test

  const conn = await Deno.connect({ port: 80 });

  // ...


- Deno.close(conn.rid);
+ conn.close();

  const file = await Deno.open("/foo/bar.txt");

  // ...

- Deno.close(file.rid);
+ file.close();

See the Deno 1.40 blog post for details.

Deno.Conn.prototype.rid

Use Deno.Conn instance methods instead.

  const conn = await Deno.connect({ port: 80 });

  const buffer = new Uint8Array(1_024);
- await Deno.read(conn.rid, buffer);
+ await conn.read(buffer);

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(conn.rid, data);
+ await conn.write(data);

- await Deno.shutdown(conn.rid);
+ await conn.closeWrite();

- Deno.close(conn.rid);
+ conn.close();

See the Deno 1.40 blog post for details.

Deno.ConnectTlsOptions.certChain

Use the cert option instead.

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
using conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
- certChain: Deno.readTextFileSync("./server.crt"),
+ cert: Deno.readTextFileSync("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

See deno#22274 for details.

Deno.ConnectTlsOptions.certFile

Use the cert option instead.

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
using conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
- certFile: "./server.crt",
+ cert: Deno.readTextFileSync("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

See deno#22274 for details.

Deno.ConnectTlsOptions.privateKey

Use the key option instead.

const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
using conn = await Deno.connectTls({
  hostname: "192.0.2.1",
  port: 80,
  caCerts: [caCert],
  cert: Deno.readTextFileSync("./server.crt"),
- keyFile: "./server.key",
+ key: Deno.readTextFileSync("./server.key"),
});

See deno#22274 for details.

Deno.copy()

Use copy() from the Standard Library instead.

+ import { copy } from "jsr:@std/io/copy";

  using file = await Deno.open("/foo/bar.txt");

- await Deno.copy(file, Deno.stdout);
+ await copy(file, Deno.stdout);

See deno#9795 for details.

Deno.customInspect

Use Symbol.for("Deno.customInspect") instead.

class Foo {
- [Deno.customInspect]() {
+ [Symbol.for("Deno.customInspect")] {
  }
}

See deno#9294 for details.

Deno.fdatasync()

Use Deno.FsFile.prototype.syncData() instead.

  using file = await Deno.open("/foo/bar.txt", { read: true, write: true });

  await file.write(new TextEncoder().encode("Hello, world!"));
- await Deno.fdatasync(file.rid);
+ await file.syncData();

Deno.fdatasyncSync()

Use Deno.FsFile.prototype.syncDataSync() instead.

  using file = Deno.openSync("/foo/bar.txt", { read: true, write: true });

  file.writeSync(new TextEncoder().encode("Hello, world!"));
- Deno.fdatasyncSync(file.rid);
+ file.syncDataSync();

Deno.File

Use Deno.FsFile instead.

- function foo(file: Deno.File) {
+ function foo(file: Deno.FsFile) {
  // ...
}

See deno#13661 for details.

Deno.flock()

Use Deno.FsFile.prototype.lock() instead.

  using file = await Deno.open("/foo/bar.txt");

- await Deno.flock(file.rid);
+ await file.lock();

See deno#22178 for details.

Deno.flockSync()

Use Deno.FsFile.prototype.lockSync() instead.

  using file = Deno.openSync("/foo/bar.txt");

- Deno.flockSync(file.rid);
+ file.lockSync();

See deno#22178 for details.

Deno.FsFile.prototype.rid

Use Deno.FsFile instance methods instead.

  const file = await Deno.open("/foo/bar.txt");

  const buffer = new Uint8Array(1_024);
- await Deno.read(file.rid, buffer);
+ await file.read(buffer);

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(file.rid, data);
+ await file.write(data);

- Deno.close(file.rid);
+ file.close();

Deno.fstatSync()

Use Deno.FsFile.prototype.statSync() instead.

  using file = Deno.openSync("/foo/bar.txt");

- const fileInfo = Deno.fstatSync(file.rid);
+ const fileInfo = file.statSync();

See the Deno 1.40 blog post for details.

Deno.fstat()

Use Deno.FsFile.prototype.stat() instead.

  using file = await Deno.open("/foo/bar.txt");

- const fileInfo = await Deno.fstat(file.rid);
+ const fileInfo = await file.stat();

See the Deno 1.40 blog post for details.

Deno.FsWatcher.prototype.rid

Use Deno.FsWatcher instance methods instead.

  using watcher = Deno.watchFs("/dir");

  // ...

- Deno.close(watcher.rid);
+ watcher.close();

See Deno 1.40 blog post for details.

Deno.fsync()

Use Deno.FsFile.prototype.sync() instead.

  using file = await Deno.open("/foo/bar.txt", { read: true, write: true });

  await file.write(new TextEncoder().encode("Hello, world!"));
  await file.truncate(1);
- await Deno.fsync(file.rid);
+ await file.sync();

Deno.fsyncSync()

Use Deno.FsFile.prototype.syncSync() instead.

  using file = Deno.openSync("/foo/bar.txt", { read: true, write: true });

  file.writeSync("new TextEncoder().encode("Hello, world!"));
  file.truncateSync(1);
- Deno.fsyncSync(file.rid);
+ file.syncSync();

Deno.ftruncateSync()

Use Deno.FsFile.prototype.truncateSync() instead.

  using file = Deno.openSync("/foo/bar.txt");

- Deno.ftruncateSync(file.rid, 7);
+ file.truncateSync(7);

See the Deno 1.40 blog post for details.

Deno.ftruncate()

Use Deno.FsFile.prototype.truncate() instead.

  using file = await Deno.open("/foo/bar.txt");

- await Deno.ftruncate(file.rid, 7);
+ await file.truncate(7);

See the Deno 1.40 blog post for details.

Deno.funlock()

Use Deno.FsFile.prototype.unlock() instead.

  using file = await Deno.open("/foo/bar.txt");

- await Deno.funlock(file.rid);
+ await file.unlock();

See deno#22178 for details.

Deno.funlockSync()

Use Deno.FsFile.prototype.unlockSync() instead.

  using file = Deno.openSync("/foo/bar.txt");

- Deno.funlockSync(file.rid);
+ file.unlockSync();

See deno#22178 for details.

Deno.futimeSync()

Use Deno.FsFile.prototype.utimeSync() instead.

  using file = Deno.openSync("/foo/bar.txt");

- Deno.futimeSync(file.rid, 1556495550, new Date());
+ file.utimeSync(1556495550, new Date());

See the Deno 1.40 blog post for details.

Deno.futime()

Use Deno.FsFile.prototype.utime() instead.

  using file = await Deno.open("/foo/bar.txt");

- await Deno.futime(file.rid, 1556495550, new Date());
+ await file.utime(1556495550, new Date());

See the Deno 1.40 blog post for details.

Deno.isatty()

Use Deno.FsFile.prototype.isTerminal(), Deno.stdin.prototype.isTerminal(), Deno.stdout.prototype.isTerminal() or Deno.stderr.prototype.isTerminal() instead.

  using file = await Deno.open("/dev/tty6");

- Deno.isatty(file.rid);
+ file.isTerminal();

- Deno.isatty(Deno.stdin.rid);
+ Deno.stdin.isTerminal();

- Deno.isatty(Deno.stdout.rid);
+ Deno.stdout.isTerminal();

- Deno.isatty(Deno.stderr.rid);
+ Deno.stderr.isTerminal();

See the Deno 1.40 blog post for details.

Deno.iter()

Use iterateReader() from the Standard Library instead.

+ import { iterateReader } from "jsr:@std/io/iterate-reader";

- for await (const chunk of Deno.iter(Deno.stdout)) {
+ for await (const chunk of iterateReader(Deno.stdout)) {
  // ...
}

+ import { iterateReaderSync } from "jsr:@std/io/iterate-reader";

  using file = await Deno.open("/foo/bar.txt");

- for await (const chunk of Deno.iter(file)) {
+ for await (const chunk of iterateReader(file)) {
  // ...
}

See deno#9795 for details.

Deno.iterSync()

Use iterateReaderSync() from the Standard Library instead.

+ import { iterateReaderSync } from "jsr:@std/io/iterate-reader";

- for (const chunk of Deno.iterSync(Deno.stdout)) {
+ for (const chunk of iterateReaderSync(Deno.stdout)) {
  // ...
}

+ import { iterateReaderSync } from "jsr:@std/io/iterate-reader";

  using file = await Deno.open("/foo/bar.txt");

- for (const chunk of Deno.iterSync(file)) {
+ for (const chunk of iterateReaderSync(file)) {
  // ...
}

See deno#9795 for details.

Deno.Listener.prototype.rid

Use Deno.Listener instance methods instead.

  const listener = Deno.listen({ port: 80 })

- Deno.close(listener.rid);
+ listener.close();

See the Deno 1.40 blog post for details.

Deno.ListenTlsOptions.certChain

Use the cert option instead.

using listener = Deno.listenTls({
  port: 443,
- certChain: Deno.readTextFile("./server.crt"),
+ cert: Deno.readTextFile("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

Deno.ListenTlsOptions.certFile

Pass the certificate file contents to the cert option instead.

using listener = Deno.listenTls({
  port: 443,
- certFile: "./server.crt",
+ cert: Deno.readTextFile("./server.crt"),
  key: Deno.readTextFileSync("./server.key"),
});

See deno#12639 for details.

Deno.ListenTlsOptions.keyFile

Pass the key file contents to the key option instead.

using listener = Deno.listenTls({
  port: 443,
  cert: Deno.readTextFile("./server.crt"),
- keyFile: "./server.key",
+ key: Deno.readTextFileSync("./server.key"),
});

See deno#12639 for details.

Deno.metrics()

There is no replacement API for this symbol.

Deno.readAllSync()

Use readAllSync() from the Standard Library instead.

+ import { readAllSync } from "jsr:@std/io/read-all";

- const data = Deno.readAllSync(Deno.stdin);
+ const data = readAllSync(Deno.stdin);

+ import { readAllSync } from "jsr:@std/io/read-all";

  using file = Deno.openSync("/foo/bar.txt", { read: true });

- const data = Deno.readAllSync(file);
+ const data = readAllSync(file);

See deno#9795 for details.

Deno.readAll()

Use readAll() from the Standard Library instead.

+ import { readAll } from "jsr:@std/io/read-all";

- const data = await Deno.readAll(Deno.stdin);
+ const data = await readAll(Deno.stdin);

+ import { readAll } from "jsr:@std/io/read-all";

  using file = await Deno.open("/foo/bar.txt", { read: true });

- const data = await Deno.readAll(file);
+ const data = await readAll(file);

See deno#9795 for details.

Deno.Reader

Use Reader from the Standard Library instead.

+ import type { Reader } from "jsr:@std/io/types";

- function foo(closer: Deno.Reader) {
+ function foo(closer: Reader) {
  // ...  
}

See deno#9795 for details.

Deno.ReaderSync

Use ReaderSync from the Standard Library instead.

+ import type { ReaderSync } from "jsr:@std/io/types";

- function foo(reader: Deno.ReaderSync) {
+ function foo(reader: ReaderSync) {
  // ...  
}

See deno#9795 for details.

Deno.readSync()

Use the .readSync() method on the resource itself.

  using conn = await Deno.connect({ port: 80 });
  const buffer = new Uint8Array(1_024);

- Deno.readSync(conn.rid, buffer);
+ conn.readSync(buffer);

  using file = Deno.openSync("/foo/bar.txt");
  const buffer = new Uint8Array(1_024);

- Deno.readSync(file.rid, buffer);
+ file.readSync(buffer);

See deno#9795 for details.

Deno.read()

Use the .read() method on the resource itself.

  using conn = await Deno.connect({ port: 80 });
  const buffer = new Uint8Array(1_024);

- await Deno.read(conn.rid, buffer);
+ await conn.read(buffer);

  using file = await Deno.open("/foo/bar.txt");
  const buffer = new Uint8Array(1_024);

- await Deno.read(file.rid, buffer);
+ await file.read(buffer);

See deno#9795 for details.

Deno.resources()

There is no replacement API for this symbol, as resource IDs (RIDs) are being phased-out.

Deno.run()

Use new Deno.Command() instead.

- const process = Deno.run({ cmd: [ "echo", "hello world" ], stdout: "piped" });
- const [{ success }, stdout] = await Promise.all([
-   process.status(),
-   process.output(),
- ]);
- process.close();
+ const command = new Deno.Command("echo", {
+   args: ["hello world"]
+ });
+ const { success, stdout } = await command.output();
  console.log(success);
  console.log(new TextDecoder().decode(stdout));

Note: This symbol is soft-removed as of Deno 2. Its types have been removed but its implementation remains in order to reduce breaking changes. You can ignore "property does not exist" TypeScript errors by using the @ts-ignore directive.

+ // @ts-ignore `Deno.run()` is soft-removed as of Deno 2.
  const process = Deno.run({ cmd: [ "echo", "hello world" ], stdout: "piped" });
  const [{ success }, stdout] = await Promise.all([
    process.status(),
    process.output(),
  ]);
  process.close();
  console.log(success);
  console.log(new TextDecoder().decode(stdout));

See deno#16516 for details.

Deno.Seeker

Use Seeker from the Standard Library instead.

+ import type { Seeker } from "jsr:@std/io/types";

- function foo(seeker: Deno.Seeker) {
+ function foo(seeker: Seeker) {
  // ...  
}

Deno.SeekerSync

Use SeekerSync from the Standard Library instead.

+ import type { SeekerSync } from "jsr:@std/io/types";

- function foo(seeker: Deno.SeekerSync) {
+ function foo(seeker: SeekerSync) {
  // ...  
}

Deno.seekSync()

Use Deno.FsFile.prototype.seekSync() instead.

  using file = await Deno.open("/foo/bar.txt");

- Deno.seekSync(file.rid, 6, Deno.SeekMode.Start);
+ file.seekSync(6, Deno.SeekMode.Start);

See Deno 1.40 blog post for details.

Deno.seek()

Use Deno.FsFile.prototype.seek() instead.

  using file = await Deno.open("/foo/bar.txt");

- await Deno.seek(file.rid, 6, Deno.SeekMode.Start);
+ await file.seek(6, Deno.SeekMode.Start);

See Deno 1.40 blog post for details.

Deno.serveHttp()

Use Deno.serve() instead.

- const conn = Deno.listen({ port: 80 });
- const httpConn = Deno.serveHttp(await conn.accept());
- const e = await httpConn.nextRequest();
- if (e) {
-  e.respondWith(new Response("Hello World"));
- }
+ Deno.serve({ port: 80 }, () => new Response("Hello World"));

  const conn = Deno.listen({ port: 80 });
+ // @ts-ignore `Deno.serveHttp()` is soft-removed as of Deno 2.
  const httpConn = Deno.serveHttp(await conn.accept());
  const e = await httpConn.nextRequest();
  if (e) {
   e.respondWith(new Response("Hello World"));
  }

See the Deno 1.35 blog post for details.

Deno.Server

Use Deno.HttpServer instead.

- function foo(server: Deno.Server) {
+ function foo(server: Deno.HttpServer) {
  // ...  
}

See deno#20840 for details.

Deno.shutdown()

Use Deno.Conn.closeWrite() instead.

  using conn = await Deno.connect({ port: 80 });

- await Deno.shutdown(conn.rid);
+ await conn.closeWrite();

See Deno 1.40 blog post for details.

Deno.stderr.prototype.rid

Use Deno.stderr instance methods instead.

- if (Deno.isatty(Deno.stderr.rid)) {
+ if (Deno.stderr.isTerminal()) {
    console.log("`Deno.stderr` is a terminal");
  }

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(Deno.stderr.rid, data);
+ await Deno.stderr.write(data);

- Deno.close(Deno.stderr.rid);
+ Deno.stderr.close();

+ // @ts-ignore `Deno.stderr.rid` is soft-removed as of Deno 2.
  Deno.isatty(Deno.stderr.rid);

See Deno 1.40 blog post for details.

Deno.stdin.prototype.rid

Use Deno.stdin instance methods instead.

- if (Deno.isatty(Deno.stdin.rid)) {
+ if (Deno.stdin.isTerminal()) {
    console.log("`Deno.stdout` is a terminal");
  }

  const buffer = new Uint8Array(1_024);
- await Deno.write(Deno.stdin.rid, buffer);
+ await Deno.stdin.write(buffer);

- Deno.close(Deno.stdin.rid);
+ Deno.stdin.close();

+ // @ts-ignore `Deno.stdin.rid` is soft-removed as of Deno 2.
  Deno.isatty(Deno.stdin.rid);

See Deno 1.40 blog post for details.

Deno.stdout.prototype.rid

Use Deno.stdout instance methods instead.

- if (Deno.isatty(Deno.stdout.rid)) {
+ if (Deno.stdout.isTerminal()) {
    console.log("`Deno.stdout` is a terminal");
  }

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(Deno.stdout.rid, data);
+ await Deno.stdout.write(data);

- Deno.close(Deno.stdout.rid);
+ Deno.stdout.close();

+ // @ts-ignore `Deno.stdout.rid` is soft-removed as of Deno 2.
  Deno.isatty(Deno.stdout.rid);

See Deno 1.40 blog post for details.

Deno.TcpConn.prototype.rid

Use Deno.TcpConn instance methods instead.

  using tcpConn = await Deno.connect({ port: 80 });

  const buffer = new Uint8Array(1_024);
- await Deno.read(tcpConn.rid, buffer);
+ await tcpConn.read(buffer);

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(tcpConn.rid, data);
+ await tcpConn.write(data);

- await Deno.shutdown(tcpConn.rid);
+ await tcpConn.closeWrite();

- Deno.close(tcpConn.rid);
+ tcpConn.close();

See the Deno 1.40 blog post for details.

Deno.TlsConn.prototype.rid

Use Deno.TlsConn instance methods instead.

  const caCert = await Deno.readTextFile("./certs/my_custom_root_CA.pem");
  using tlsConn = await Deno.connectTls({ caCerts: [caCert], hostname: "192.0.2.1", port: 80 });

  const buffer = new Uint8Array(1_024);
- await Deno.read(tlsConn.rid, buffer);
+ await tlsConn.read(buffer);

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(tlsConn.rid, data);
+ await tlsConn.write(data);

- await Deno.shutdown(tlsConn.rid);
+ await tlsConn.closeWrite();

- Deno.close(tlsConn.rid);
+ tlsConn.close();

See the Deno 1.40 blog post for details.

Deno.TlsListener.prototype.rid

Use Deno.TlsListener instance methods instead.

  const listener = Deno.listenTls({
    port: 443,
    cert: Deno.readTextFileSync("./server.crt"),
    key: Deno.readTextFileSync("./server.key"),
  });

  // ...

- Deno.close(listener.rid);
+ listener.close();

See the Deno 1.40 blog post for details.

Deno.UnixConn.prototype.rid

Use Deno.UnixConn instance methods instead.

  using unixConn = await Deno.connect({ path: "/foo/bar.sock", transport: "unix" });

  const buffer = new Uint8Array(1_024);
- await Deno.read(unixConn.rid, buffer);
+ await unixConn.read(buffer);

  const data = new TextEncoder().encode("Hello, world!");
- await Deno.write(unixConn.rid, data);
+ await unixConn.write(data);

- await Deno.shutdown(unixConn.rid);
+ await unixConn.closeWrite();

- Deno.close(unixConn.rid);
+ unixConn.close();

See the Deno 1.40 blog post for details.

Deno.writeAllSync()

Use writeAllSync() from the Standard Library instead.

+ import { writeAllSync } from "jsr:@std/io/write-all";

  const data = new TextEncoder().encode("Hello, world!");

- Deno.writeAllSync(Deno.stdout, data);
+ writeAllSync(Deno.stdout, data);

See deno#9795 for details.

Deno.writeAll()

Use writeAll() from the Standard Library instead.

+ import { writeAll } from "jsr:@std/io/write-all";

  const data = new TextEncoder().encode("Hello, world!");

- await Deno.writeAll(Deno.stdout, data);
+ await writeAll(Deno.stdout, data);

See deno#9795 for details.

Deno.Writer

Use Writer from the Standard Library instead.

+ import type { Writer } from "jsr:@std/io/types";

- function foo(writer: Deno.Writer) {
+ function foo(writer: Writer) {
  // ...  
}

See deno#9795 for details.

Deno.WriterSync

Use WriterSync from the Standard Library instead.

+ import type { WriterSync } from "jsr:@std/io/types";

- function foo(writer: Deno.WriterSync) {
+ function foo(writer: WriterSync) {
  // ...  
}

See deno#9795 for details.

Deno.writeSync()

Use the .writeSync() method on the resource itself.

  using conn = await Deno.connect({ port: 80 });
  const buffer = new TextEncoder().encode("My message");

- Deno.writeSync(conn.rid, buffer);
+ conn.writeSync(buffer);

  using file = Deno.openSync("/foo/bar.txt", { write: true });
  const buffer = new TextEncoder().encode("My message");

- Deno.writeSync(file.rid, buffer);
+ file.writeSync(buffer);

See deno#9795 for details.

Deno.write()

Use the .write() method on the resource itself.

  using conn = await Deno.connect({ port: 80 });
  const buffer = new TextEncoder().encode("My message");

- await Deno.write(conn.rid, buffer);
+ await conn.write(buffer);

  using file = await Deno.open("/foo/bar.txt", { write: true });
  const buffer = new TextEncoder().encode("My message");

- await Deno.write(file.rid, buffer);
+ await file.write(buffer);

See deno#9795 for details.

new Deno.FsFile()

Use Deno.openSync() or Deno.open() instead.

- const file = new Deno.FsFile(3);
+ using file = await Deno.open("/foo/bar.txt");

window

Use globalThis instead.

  const messageBuffer = new TextEncoder().encode("Hello, world!");
  
- const hashBuffer = await window.crypto.subtle.digest("SHA-256", messageBuffer);
+ const hashBuffer = await globalThis.crypto.subtle.digest("SHA-256", messageBuffer);

See deno#9795 for details.

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Deno 1.x to 2.x Migration Guide

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Make a contribution

Backwards compatibility with Node.js and npm Jump to heading

Long Term Support releases Jump to heading

Managing dependencies Jump to heading

Monorepo, workspace and private registries support Jump to heading

Framework support Jump to heading

CLI changes Jump to heading

API changes Jump to heading