NodeJs 18 - What's new, what to expect next

• a new experimental fetch API: it starts the process of fetching a resource from the network
• a new experimental test runner: now is possible to import the node:test module to write the unit tests and report results in Test Anything Protocol (TAP) format
• Web Streams API: it is possible now to start programmatically access streams of data received over the network and process them by chunks, without needing to generate a buffer, string, or blob ; the response body is of the type ReadableStream ; will expose the experimental implementation of the Web Streams API on the global scope thus the following APIs are now globally available:
  • ReadableStream
  • ReadableStreamDefaultReader
  • ReadableStreamBYOBReader
  • ReadableStreamBYOBRequest
  • ReadableByteStreamController
  • ReadableStreamDefaultController
  • TransformStream
  • TransformStreamDefaultController
  • WritableStream
  • WritableStreamDefaultWriter
  • WritableStreamDefaultController
  • ByteLengthQueuingStrategy
  • CountQueuingStrategy
  • TextEncoderStream
  • TextDecoderStream
  • CompressionStream
  • DecompressionStream
• HTTP Timeouts: the server.headersTimeout limits the amount of time in milliseconds the parser will wait to receive the complete HTTP headers from the client
• V8 JavaScript engine updated to V8 10.1:
  • improves the overall execution speed
  • introduces two new array methods: findLast and findLastIndex
  • adds improvements to the Intl.Locale API ; adds the Intl.supportedValuesOf function

const fetchSomeData = async () => {
	const response = await fetch('http://127.0.0.1/fetch/data');
	if (response.ok) {
		const data = await response.json();
		console.log(data);
	} else {
		console.error(`${response.status} ${response.statusText}`);
	}
};

fetchSomeData();

import test from 'node:test';
import assert from 'assert';

test('sync test passing', (t) => {
  assert.strictEqual(7, 7);
});

test('sync test failing', (t) => {
  assert.strictEqual(7, 8);
});

import test from 'node:test';
import assert from 'assert';

test('async test passing', async (t) => {
  assert.strictEqual(7, 7);
});

test('async test failing', async (t) => {
  assert.strictEqual(7, 8);
});

• crypto: allow zero-length IKM in HKDF and in webcrypto PBKDF2 ; allow zero-length secret KeyObject
• http: make idle http parser count configurable ; add drop request event for http server
• net: add local family ; add ability to reset a tcp socket
• src: print source map error source on demand
• tls: pass a valid socket on tlsClientError ; move tls.parseCertString to end-of-life
• events: add CustomEvent ; expose CustomEvent on global with CLI flag
• lib: improved diagnostics_channel subscribe/unsubscribe ; implement WebAssembly Web API
• util: add tokens to parseArgs
• esm: ESM Loader hooks now support multiple custom loaders, and composition is achieved via "chaining" ; custom loaders are a powerful mechanism for controlling an application, providing extensive control over loading modules
• ssl: fix OpenSSL - AES OCB fails to encrypt some bytes
• dns: DNS rebinding in --inspect via invalid IP addresses ; accept 'IPv4' and 'IPv6' for family ; remove dns.lookup and dnsPromises.lookup options type coercion
• encoding: HTTP Request Smuggling fixes: Flawed Parsing of Transfer-Encoding ; Improper Delimiting of Header Fields ; Incorrect Parsing of Multi-line Transfer-Encoding
• security: fix a possible DLL Hijacking on Windows
• crypto: remove Node.js-specific webcrypto extensions ; add CFRG curves to Web Crypto API
• report: add more heap infos in process report
• fs: make params in writing methods optional ; runtime deprecate string coercion in fs.write and fs.writeFileSync
• process: runtime deprecate multipleResolves