/shift

Deprecated Library Catalog

Date/Time Libraries

// Before: moment
import moment from 'moment';
const formatted = moment().format('YYYY-MM-DD');

// After: date-fns (tree-shakeable)
import { format } from 'date-fns';
const formatted = format(new Date(), 'yyyy-MM-dd');

// After: Native Intl (no dependency)
const formatted = new Intl.DateTimeFormat('sv-SE').format(new Date());

HTTP Libraries

// Before: axios
import axios from 'axios';
const { data } = await axios.get('/api/users');

// After: Native fetch
const response = await fetch('/api/users');
const data = await response.json();

Testing Libraries

// Before: Enzyme
import { shallow } from 'enzyme';
const wrapper = shallow(<MyComponent />);
expect(wrapper.find('.button').text()).toBe('Click');

// After: React Testing Library
import { render, screen } from '@testing-library/react';
render(<MyComponent />);
expect(screen.getByRole('button')).toHaveTextContent('Click');

CSS/Styling Libraries

Utility Libraries

// Before: lodash
import _ from 'lodash';
const result = _.uniq(array);

// After: Native Set
const result = [...new Set(array)];

// Before: uuid
import { v4 as uuidv4 } from 'uuid';
const id = uuidv4();

// After: Native crypto
const id = crypto.randomUUID();

Build Tools

Node.js Built-in Removals (Node 24, Active LTS Oct 2025)

The following APIs were removed (not just deprecated) in Node.js 24. Code using them will throw at runtime.

Additionally, OpenSSL 3.5 (bundled in Node 24) raises the default security level to 2: RSA/DSA/DH keys < 2048 bits and ECC keys < 224 bits are rejected. Source: nodejs.org deprecated APIs v22

Python 3.13 stdlib Removals (PEP 594 — Dead Batteries)

All 19 modules below were removed in Python 3.13 (DeprecationWarning since 3.11):

aifc, audioop, cgi, cgitb, chunk, crypt, imghdr, mailcap, msilib, nis, nntplib, ossaudiodev, pipes, sndhdr, spwd, sunau, telnetlib, uu, xdrlib + 2to3/lib2to3.

Python 3.12 is the last release that ships these modules. Replacement strategies:

• cgi / cgitb → use a web framework (Flask, FastAPI, Django)
• crypt → hashlib + secrets (or passlib / bcrypt for password hashing)
• telnetlib → asyncssh, paramiko, or raw socket/asyncio

Source: peps.python.org/pep-0594, docs.python.org whatsnew 3.13

Java Platform Removals (2025–2026)

Sources: openjdk.org/jeps/486, openjdk.org/jeps/504, inside.java applet removal

Web Platform Sunsets (2025–2026)

Source: chromestatus.com Privacy Sandbox deprecation

Go 1.24 Crypto Deprecations (Feb 2025)

Source: go.dev/doc/go1.24

PHP 8.4 Deprecations (Nov 2024)

• Implicit nullable parameters — function foo(Foo $x = null) now emits DeprecationWarning; update to function foo(?Foo $x = null) or function foo(Foo|null $x = null).
• trigger_error(E_USER_ERROR) — deprecated; use exceptions.
• New #[Deprecated] attribute — can mark user-land functions, methods, and class constants; PHP auto-emits deprecation messages on use.

Source: php.net/releases/8.4, php.watch Deprecated attribute

Ruby 3.4 Deprecations (Dec 2024)

• syslog and base64 removed from default gems — add gem 'syslog' / gem 'base64' to Gemfile explicitly.
• Mutable string literals — emit deprecation warning without # frozen_string_literal: true; enable with -W:deprecated.
• rb_gc_force_recycle C API removed — gem authors must update native extensions.

Source: ruby-lang.org Ruby 3.4 released

Sources (verified 2026-05)

• React team: Sunsetting Create React App (2025-02-14)
• TC39: Temporal proposal reached Stage 4 (March 2026 plenary)
• CISA: Supply Chain Compromise Impacts Axios npm Package (2026-04-20)
• Node.js: Modules: TypeScript, WebSocket, release schedule
• Node.js 24 removals: Deprecated APIs v22 (2025)
• Python PEP 594: peps.python.org/pep-0594 — Dead Batteries removed in Python 3.13
• Java JEP 486: openjdk.org/jeps/486 — SecurityManager permanently disabled JDK 24 (2025)
• Java JEP 504: openjdk.org/jeps/504 — Applet API removed JDK 26 (2026-03)
• Go 1.24: go.dev/doc/go1.24 — crypto deprecations (Feb 2025)
• Web Platform: chromestatus Topics API — Privacy Sandbox retired Oct 2025
• PHP 8.4: php.watch/versions/8.4/Deprecated (Nov 2024)
• Ruby 3.4: ruby-lang.org (Dec 2024)
• MDN: Object.groupBy, Set methods
• web.dev: Iterator helpers Baseline (2025-03)