CodeSampleX

Sample

@isaacs/cliui 8.0.2: format multi-column terminal UI text with cliui

Verified sample for npm @isaacs/cliui 8.0.2: format multi-column terminal UI text with cliui. The contract ran on node 22 · linux alpine/x64 · docker and…

sha256:a134ecfbadb016c567df2025b0c7880ef4e041a9e8ebff662de707b87d3a75a2

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Case

HOW
Goal
format multi-column terminal UI text with cliui
Packages
Environment
node 22.23.2
Created
2026-08-28T08:21:46Z

Contract

  1. cliui creates terminal UI instances with configurable width and text wrapping options
  2. ui.div formats multi-column rows with custom column widths, padding, and alignment
  3. ui.resetOutput clears rendered rows while preserving instance configuration
  4. ui.div parses Layout DSL strings into rows and columns using tab and newline delimiters
  5. ui.span appends subsequent rows inline when wrapping is disabled

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: format multi-column terminal UI text with cliui
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40isaacs/cliui@8.0.2
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
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package-lock.json
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package.json
{
  "name": "sample-isaacs-cliui",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @isaacs/cliui",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "@isaacs/cliui": "8.0.2"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "format multi-column terminal UI text with cliui",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40isaacs/cliui@8.0.2"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.js
const cliui = require('@isaacs/cliui');

/**
 * Creates a CLI UI instance with optional settings.
 * @param {object} [options]
 * @returns {object}
 */
function createUI(options) {
  return cliui(options);
}

/**
 * Format key-description pairs as a 2-column layout.
 * @param {Array<{ key: string, description: string }>} entries
 * @param {number} [width=80]
 * @returns {string}
 */
function formatHelpColumns(entries, width = 80) {
  const ui = cliui({ width });
  for (const entry of entries) {
    ui.div(
      { text: entry.key, width: 25, padding: [0, 2, 0, 2] },
      { text: entry.description }
    );
  }
  return ui.toString();
}

/**
 * Format text using the cliui Layout DSL (tabs for columns, newlines for rows).
 * @param {string} dslText
 * @param {number} [width=80]
 * @returns {string}
 */
function formatLayoutDSL(dslText, width = 80) {
  const ui = cliui({ width });
  ui.div(dslText);
  return ui.toString();
}

module.exports = {
  cliui,
  createUI,
  formatHelpColumns,
  formatLayoutDSL,
};
test/contract.mjs
import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  cliui,
  createUI,
  formatHelpColumns,
  formatLayoutDSL,
} = require('../src/index.js');

// 1. Export contract checks
assert.strictEqual(typeof cliui, 'function', 'cliui should be exported as a function');
assert.strictEqual(typeof createUI, 'function', 'createUI helper should be exported as a function');
assert.strictEqual(typeof formatHelpColumns, 'function', 'formatHelpColumns should be exported as a function');
assert.strictEqual(typeof formatLayoutDSL, 'function', 'formatLayoutDSL should be exported as a function');

// 2. Factory creation and instance methods
const ui = cliui({ width: 80, wrap: true });
assert.strictEqual(typeof ui.div, 'function', 'ui.div should be a function');
assert.strictEqual(typeof ui.span, 'function', 'ui.span should be a function');
assert.strictEqual(typeof ui.resetOutput, 'function', 'ui.resetOutput should be a function');
assert.strictEqual(typeof ui.toString, 'function', 'ui.toString should be a function');

// 3. Multi-column div formatting with column objects
ui.div(
  { text: '-h, --help', width: 20, padding: [0, 2, 0, 0] },
  { text: 'display help for command' }
);
const renderedHelp = ui.toString();
assert.ok(renderedHelp.includes('-h, --help'), 'output must include the first column text');
assert.ok(renderedHelp.includes('display help for command'), 'output must include the second column text');

// 4. Reset output behavior
ui.resetOutput();
assert.strictEqual(ui.toString(), '', 'resetOutput should clear rows');

// 5. Layout DSL (tab-separated columns and newline-separated rows)
const dslOutput = formatLayoutDSL('cmd\tDescription of cmd\nopt\tDescription of opt', 60);
assert.ok(dslOutput.includes('cmd'), 'DSL output should include command key');
assert.ok(dslOutput.includes('Description of cmd'), 'DSL output should include command description');
assert.ok(dslOutput.includes('opt'), 'DSL output should include option key');
assert.ok(dslOutput.includes('Description of opt'), 'DSL output should include option description');

// 6. Helper function formatting multiple entries
const table = formatHelpColumns([
  { key: '--config', description: 'Path to configuration file' },
  { key: '--verbose', description: 'Enable verbose logging output' },
], 80);
assert.ok(table.includes('--config'), 'table output should contain --config');
assert.ok(table.includes('Path to configuration file'), 'table output should contain description');
assert.ok(table.includes('--verbose'), 'table output should contain --verbose');

// 7. Right-aligned columns
const customUI = cliui({ width: 40 });
customUI.div(
  { text: 'Status', width: 20 },
  { text: 'OK', width: 20, align: 'right' }
);
const customRendered = customUI.toString();
assert.ok(customRendered.includes('Status'), 'should contain left column');
assert.ok(customRendered.endsWith('OK'), 'right aligned text should appear at the end of the line');

// 8. Span with wrap: false appends subsequent row inline
const spanUI = cliui({ wrap: false });
spanUI.span('Prefix:');
spanUI.div('Value');
assert.strictEqual(spanUI.toString(), 'Prefix:Value', 'span with wrap: false should append next row inline');

console.log('All contract tests passed.');

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