VibeUI

Code Block

Split Compare

Two versions of a file side by side: before on the left, after on the right, line facing line, and an empty slot is an explicit placeholder, not a lost piece of code.

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Preview

1440pxHost theme

Use it with AI

  1. 1. Copy the link.
  2. 2. Write to your agent in your own words and drop the link into the sentence.
  3. 3. The agent opens the link and installs the component from the registry.

put this in the header: https://vibeui.ru/c/codeblock-024?lang=en

lib/total.ts
Before
export function total(items) {  let sum = 0  for (const item of items) {    sum += item.price  }  return sum}
Стало
export function total(items) {  return items.reduce(    (sum, item) => sum + item.price,    0,  ) }
Show the full instructions

What the link says, spelled out. Use it when your agent cannot open links — paste this text instead.

# Install and place "codeblock-024" (Split Compare) from VibeUI

## 1. Install first — do not skip, do not recreate
Run this exact command before writing any code:
npx shadcn@latest add https://vibeui.ru/r/codeblock-024.json

Registry item: https://vibeui.ru/r/codeblock-024.json
Installs to: components/vibeui/codeblock-024.tsx (the exact path follows this project's components.json aliases).
npm dependencies: none.
Registry dependencies: none.

Install it from the registry. Do not recreate it from the description,
do not substitute a similar component from another library, and do not
rewrite it to match the project's existing style.

## 2. What it is
Two versions of a file side by side: before on the left, after on the right, line facing line, and an empty slot is an explicit placeholder, not a lost piece of code.

A two-pane comparison of file versions: rows aligned horizontally, gaps shown as placeholders. Zero dependencies, no client JS.

## 3. How to use it
import { Codeblock024 } from "@/components/vibeui/codeblock-024"

<Codeblock024
  path="lib/total.ts"
  beforeLabel="Before"
  afterLabel="After"
/>

Read the installed file for the full prop list.

## 4. Where to place it
This is a small inline component. Put it exactly where the user asked,
inside the existing markup. Do not create a new page, section or
wrapper for it. If a similar control already sits in that spot,
replace it instead of adding a second one.

Placement: ___
(The user fills this line in. If it is still blank, ask where to put it
instead of guessing.)

## 5. Keep exactly as installed
- the local --vibeui-codeblock-024-* palette — do not swap it for your theme tokens
- the placeholders for missing rows: without them the other pane slides up and the comparison breaks
- the sign in the pane caption next to the colour: a tint alone is unreadable for colour blindness
- the counter that skips placeholders — otherwise the numbering drifts from the real file
- the layout rules on the inner shell: a container query never applies to the container itself
- the dark surface of the block — light monospaced text is unreadable without it

## 6. You may change
- the compared rows through the rows array
- the file path through path
- the pane captions through beforeLabel and afterLabel
- the removed and added hues to match your palette

## 7. Rules
- Matching the lines is the caller's job: rows arrives already aligned into pairs.
- On a narrow width the panes stack, and the comparison turns from horizontal into vertical.
- A change inside a line is not highlighted: the whole line is marked instead.
- Do not lift the CSS variables into globals.css: the component has to stay a single file.

## 8. Verify
- it renders with no console errors;
- it looks like the preview on the VibeUI page you copied this from;
- if it does not, you changed something listed in section 5 — put it back.

For developers

npx shadcn@latest add https://vibeui.ru/r/codeblock-024.json
https://vibeui.ru/r/codeblock-024.json

Компонент самодостаточен: один файл, без зависимостей, собственная палитра в локальных переменных --vibeui-codeblock-024-*. Серверный: хуков нет. Панели получают один и тот же массив rows, поэтому строки всегда стоят напротив друг друга; отсутствующая строка рисуется заглушкой с другой подложкой, и счётчик номеров её пропускает — нумерация остаётся верной для каждой версии отдельно. Раскладка считается от собственной ширины: до 34rem панели встают друг под друга, дальше делят ширину пополам, и правила лежат на внутреннем [data-part="shell"].

Component source

The same file your agent installs. Here in case you would rather copy it by hand.

import type { CSSProperties } from "react"

export type Codeblock024Row = {
  before: string | null
  after: string | null
}

export type Codeblock024Props = {
  path?: string
  beforeLabel?: string
  afterLabel?: string
  rows?: Codeblock024Row[]
  className?: string
  style?: CSSProperties
}

// Идея компонента: две версии файла рядом, строка напротив строки. Пустые
// места слева и справа — это не пропуск, а явная заглушка, поэтому глаз ведёт
// по одной горизонтали; на узкой ширине панели встают друг под друга.
const STYLES = `
:where([data-vibeui-block="codeblock-024"]){
--vibeui-codeblock-024-bg:oklch(0.19 0.014 265);
--vibeui-codeblock-024-head:oklch(0.23 0.018 265);
--vibeui-codeblock-024-fg:oklch(0.93 0.008 265);
--vibeui-codeblock-024-muted:oklch(0.66 0.016 265);
--vibeui-codeblock-024-gutter:oklch(0.5 0.02 265);
--vibeui-codeblock-024-border:oklch(1 0 0 / 12%);
--vibeui-codeblock-024-del:oklch(0.78 0.16 25);
--vibeui-codeblock-024-del-bg:oklch(0.5 0.16 25 / 18%);
--vibeui-codeblock-024-add:oklch(0.82 0.15 152);
--vibeui-codeblock-024-add-bg:oklch(0.5 0.14 152 / 18%);
--vibeui-codeblock-024-void:oklch(1 0 0 / 4%);
--vibeui-codeblock-024-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
--vibeui-codeblock-024-font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
container-type:inline-size;
}
[data-vibeui-block="codeblock-024"]{
display:block;width:100%;max-width:44rem;box-sizing:border-box;margin:0;
overflow:hidden;border:1px solid var(--vibeui-codeblock-024-border);
border-radius:0.75rem;
background:var(--vibeui-codeblock-024-bg);color:var(--vibeui-codeblock-024-fg);
font-family:var(--vibeui-codeblock-024-font);
}
[data-vibeui-block="codeblock-024"] [data-part="head"]{
padding:0.5rem 0.875rem;
background:var(--vibeui-codeblock-024-head);
border-bottom:1px solid var(--vibeui-codeblock-024-border);
font-family:var(--vibeui-codeblock-024-mono);font-size:0.75rem;
color:var(--vibeui-codeblock-024-muted);
}
[data-vibeui-block="codeblock-024"] [data-part="shell"]{
display:grid;grid-template-columns:1fr;
}
[data-vibeui-block="codeblock-024"] [data-part="pane"]{min-width:0}
[data-vibeui-block="codeblock-024"] [data-part="pane"] + [data-part="pane"]{
border-top:1px solid var(--vibeui-codeblock-024-border);
}
[data-vibeui-block="codeblock-024"] [data-part="label"]{
display:flex;align-items:center;gap:0.375rem;
padding:0.3125rem 0.875rem;
border-bottom:1px solid var(--vibeui-codeblock-024-border);
font-size:0.6875rem;font-weight:650;letter-spacing:0.04em;text-transform:uppercase;
color:var(--vibeui-codeblock-024-muted);
}
[data-vibeui-block="codeblock-024"] [data-part="label"]::before{
content:"−";flex:none;color:var(--vibeui-codeblock-024-del);font-weight:700;
}
[data-vibeui-block="codeblock-024"] [data-side="after"] [data-part="label"]::before{
content:"+";color:var(--vibeui-codeblock-024-add);
}
[data-vibeui-block="codeblock-024"] pre{margin:0;padding:0.5rem 0;overflow-x:auto}
[data-vibeui-block="codeblock-024"] code{
display:block;min-width:max-content;
font-family:var(--vibeui-codeblock-024-mono);
font-size:0.75rem;line-height:1.75;white-space:pre;
counter-reset:line;
}
[data-vibeui-block="codeblock-024"] [data-part="row"]{
display:block;position:relative;padding:0 0.75rem 0 2.5rem;min-height:1.75em;
}
[data-vibeui-block="codeblock-024"] [data-part="row"]:not([data-void="true"])::before{
counter-increment:line;content:counter(line);
position:absolute;left:0;width:1.75rem;text-align:right;
color:var(--vibeui-codeblock-024-gutter);font-variant-numeric:tabular-nums;
user-select:none;-webkit-user-select:none;pointer-events:none;
}
/* Заглушка вместо строки: без неё соседняя панель уехала бы вверх и
   сравнение по горизонтали перестало бы работать. */
[data-vibeui-block="codeblock-024"] [data-part="row"][data-void="true"]{
background:var(--vibeui-codeblock-024-void);
}
[data-vibeui-block="codeblock-024"] [data-side="before"] [data-part="row"][data-changed="true"]{
background:var(--vibeui-codeblock-024-del-bg);
box-shadow:inset 0.125rem 0 0 var(--vibeui-codeblock-024-del);
}
[data-vibeui-block="codeblock-024"] [data-side="after"] [data-part="row"][data-changed="true"]{
background:var(--vibeui-codeblock-024-add-bg);
box-shadow:inset 0.125rem 0 0 var(--vibeui-codeblock-024-add);
}
@container (min-width: 34rem){
[data-vibeui-block="codeblock-024"] [data-part="shell"]{grid-template-columns:1fr 1fr}
[data-vibeui-block="codeblock-024"] [data-part="pane"] + [data-part="pane"]{
border-top:0;border-left:1px solid var(--vibeui-codeblock-024-border);
}
}
`

const ROWS: Codeblock024Row[] = [
  {
    before: "export function total(items) {",
    after: "export function total(items) {",
  },
  { before: "  let sum = 0", after: "  return items.reduce(" },
  {
    before: "  for (const item of items) {",
    after: "    (sum, item) => sum + item.price,",
  },
  { before: "    sum += item.price", after: "    0," },
  { before: "  }", after: "  )" },
  { before: "  return sum", after: null },
  { before: "}", after: "}" },
]

/** Две версии файла рядом: было слева, стало справа, строка напротив строки. */
export function Codeblock024({
  path = "lib/total.ts",
  beforeLabel = "Было",
  afterLabel = "Стало",
  rows = ROWS,
  className,
  style,
}: Codeblock024Props) {
  const panes = [
    { side: "before" as const, label: beforeLabel },
    { side: "after" as const, label: afterLabel },
  ]

  return (
    <>
      <style href="vibeui-codeblock-024" precedence="medium">
        {STYLES}
      </style>
      <figure
        data-vibeui-block="codeblock-024"
        className={className}
        style={style}
      >
        <figcaption data-part="head">{path}</figcaption>
        <div data-part="shell">
          {panes.map((pane) => (
            <div key={pane.side} data-part="pane" data-side={pane.side}>
              <div data-part="label">{pane.label}</div>
              <pre>
                <code>
                  {rows.map((row, index) => {
                    const text = row[pane.side]
                    const changed = row.before !== row.after

                    return (
                      <span
                        key={index}
                        data-part="row"
                        data-void={text === null || undefined}
                        data-changed={(changed && text !== null) || undefined}
                      >
                        {text ?? " "}
                      </span>
                    )
                  })}
                </code>
              </pre>
            </div>
          ))}
        </div>
      </figure>
    </>
  )
}