frontend

typescript
import { useCallback, useEffect, useRef, useState } from 'react';

export type CopyStatus = 'idle' | 'copied' | 'error';

function fallbackCopy(text: string): boolean {
  const textarea = document.createElement('textarea');

Frontend: copy-to-clipboard with fallback

frontend ux react
by codesnips 3 tabs
typescript
import React, { useMemo } from 'react';
import { VirtualList } from './VirtualList';

interface LogEntry {
  id: number;
  level: 'info' | 'warn' | 'error';

Virtualized List in React: Render Only Visible Rows on Scroll

react virtualization windowing
by codesnips 3 tabs
typescript
import * as Sentry from "@sentry/react";

const environment = import.meta.env.VITE_ENVIRONMENT ?? "development";
const isProd = environment === "production";

export function initSentry(): void {

Sentry initialization with release + environment

observability frontend sentry
by codesnips 3 tabs
javascript
import { useCallback, useEffect, useRef, useState } from 'react';

export function usePaginatedFetch(fetchPage, { pageSize = 20 } = {}) {
  const [items, setItems] = useState([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState(null);

Infinite Scroll in React with IntersectionObserver and a Paginated Fetch Hook

react hooks infinite-scroll
by codesnips 3 tabs
javascript
import { StreamActions } from "@hotwired/turbo"

StreamActions.highlight = function () {
  const className = this.getAttribute("data-highlight-class") || "flash-highlight"
  const duration = parseInt(this.getAttribute("data-highlight-duration"), 10) || 1500

Custom turbo_stream action tag: highlight an updated element

rails hotwire turbo
by codesnips 4 tabs
typescript
import { Injectable, computed, signal } from '@angular/core';

@Injectable({ providedIn: 'root' })
export class LoadingService {
  private readonly activeRequests = signal(0);

Global Loading Spinner via In-Flight Request Tracking in an Angular HttpInterceptor

angular http-interceptor rxjs
by codesnips 4 tabs
typescript
export interface UseClipboardResult {
  copied: boolean;
  error: Error | null;
  copy: (value: string) => Promise<boolean>;
}

Copy-to-Clipboard Button With a useClipboard Hook and Timed Success Feedback

react hooks clipboard
by codesnips 3 tabs
javascript
import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["field"]

  connect() {

Stimulus: autofocus the first invalid field after Turbo update

rails stimulus hotwire
by codesnips 3 tabs
typescript
import { z } from 'zod';

export const signupSchema = z
  .object({
    email: z.string().min(1, 'Email is required').email('Enter a valid email'),
    password: z

React Hook Form + Zod resolver

react forms react-hook-form
by codesnips 3 tabs
ruby
class ApplicationController < ActionController::Base
  before_action :authenticate_user!

  rescue_from ActionController::InvalidAuthenticityToken do
    handle_unauthenticated(reason: :csrf)
  end

Turbo Streams: partial page auth failure handling

rails turbo hotwire
by codesnips 3 tabs
typescript
import { z } from "zod";

const flagValueSchema = z.union([
  z.boolean(),
  z.object({
    rollout: z.number().min(0).max(100),

Typed Feature-Flag Gate with a Zod Config Loader and useFeatureFlag Hook in React

react feature-flags typescript-hooks
by codesnips 3 tabs
typescript
export const FLAG_REGISTRY = {
  newDashboard: {
    default: false as boolean,
    description: 'Renders the redesigned dashboard shell',
  },
  maxUploadMb: {

Feature flags with a typed registry

typescript feature-flags react
by codesnips 3 tabs