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A modern runtime for JavaScript and TypeScript.
https://deno.com/
396498bf9e
This PR optimizes `Request` constructor when `init` is not empty. This path is also used by `fetch` when `options` argument is used ```js fetch("https://deno.land", { method: "POST", body: 'land' }); ``` - Removed 3 extra calls to `headerListFromHeaders` - Avoid `Object.keys` & `headerList` clone if `init.headers` is set - Only empty `headersList` (`.splice`) if it's not already empty. ## Benchmarks **this patch** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ----------------------------------------------------------------------------- ----------------------------- Request without headers 1.86 µs/iter 536,440.7 (1.67 µs … 2.76 µs) 1.89 µs 2.76 µs 2.76 µs Request with headers 1.96 µs/iter 509,440.5 (1.83 µs … 2.17 µs) 1.99 µs 2.17 µs 2.17 µs ``` **main** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ----------------------------------------------------------------------------- ----------------------------- Request without headers 1.96 µs/iter 510,201.5 (1.81 µs … 2.64 µs) 2 µs 2.64 µs 2.64 µs Request with headers 2.03 µs/iter 493,526.6 (1.84 µs … 2.31 µs) 2.08 µs 2.31 µs 2.31 µs ``` ```js Deno.bench("Request without headers", () => { const r = new Request("https://deno.land", { method: "POST", body: '{"foo": "bar"}', }); }); Deno.bench("Request with headers", () => { const r = new Request("https://deno.land", { method: "POST", body: '{"foo": "bar"}', headers: { "Content-Type": "application/json", }, }); }); ``` |
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.cargo | ||
.devcontainer | ||
.github | ||
bench_util | ||
cli | ||
ext | ||
runtime | ||
test_ffi | ||
test_napi | ||
test_util | ||
third_party@7f1a41fee1 | ||
tools | ||
.dlint.json | ||
.dprint.json | ||
.editorconfig | ||
.gitattributes | ||
.gitignore | ||
.gitmodules | ||
.rustfmt.toml | ||
Cargo.lock | ||
Cargo.toml | ||
LICENSE.md | ||
README.md | ||
Releases.md | ||
rust-toolchain.toml |
Deno
Deno is a simple, modern and secure runtime for JavaScript and TypeScript that uses V8 and is built in Rust.
Features
- Secure by default. No file, network, or environment access, unless explicitly enabled.
- Provides
web platform functionality and APIs,
e.g. using ES modules, web workers, and
fetch()
. - Supports TypeScript out of the box.
- Ships only a single executable file.
- Built-in tooling including
deno test
,deno fmt
,deno bench
, and more. - Includes a set of reviewed standard modules guaranteed to work with Deno.
- Supports npm.
Install
Shell (Mac, Linux):
curl -fsSL https://deno.land/install.sh | sh
PowerShell (Windows):
irm https://deno.land/install.ps1 | iex
Homebrew (Mac):
brew install deno
Chocolatey (Windows):
choco install deno
Scoop (Windows):
scoop install deno
Build and install from source using Cargo:
cargo install deno --locked
See deno_install and releases for other options.
Getting Started
deno run https://deno.land/std/examples/welcome.ts
Or setup a simple HTTP server:
Deno.serve((_req) => new Response("Hello, World!"));
Additional Resources
- The Deno Manual is a great starting point for additional examples, setting up your environment, using npm, and more.
- Runtime API reference documents all APIs built into Deno CLI.
- Deno Standard Modules do not have external dependencies and are reviewed by the Deno core team.
- deno.land/x is the registry for third party modules.
- Blog is where the Deno team shares important product updates and “how to”s about solving technical problems.
Contributing
We appreciate your help!
To contribute, please read our contributing instructions.