tiny-relative-date 1.3.0: relativeDate, relativeDateFactory

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: verify pkg:npm/tiny-relative-date@1.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/tiny-relative-date@1.3.0

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.

{"case":{"caseId":"case:sha256:42f6c059b9be59f6ab09f2540301e80b7226ef950ff2f51760e12da1b428ce0d","contract":["relativeDate(date, now) formats past and future Date instances, ISO strings, and millisecond timestamps into human-readable English relative strings across thresholds from 'just now' to 'over a year ago'","relativeDateFactory(translations) creates a customized relative date formatter supporting built-in locale modules (e.g. translations/en-short.js) as well as custom template strings with {{time}} placeholders and callback functions"],"goal":"verify pkg:npm/tiny-relative-date@1.3.0","kind":"HOW","packages":["pkg:npm/tiny-relative-date@1.3.0"],"schemaVersion":1,"symbols":["relativeDate","relativeDateFactory"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/tiny-relative-date@1.3.0"],"schemaVersion":1,"subject":"pkg:npm/tiny-relative-date@1.3.0","symbols":["relativeDate","relativeDateFactory"],"verifierAdapter":"node-typescript@1"}

{
  "name": "verify-tiny-relative-date",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "verify-tiny-relative-date",
      "version": "1.0.0",
      "dependencies": {
        "tiny-relative-date": "1.3.0"
      }
    },
    "node_modules/tiny-relative-date": {
      "version": "1.3.0",
      "resolved": "https://registry.npmjs.org/tiny-relative-date/-/tiny-relative-date-1.3.0.tgz",
      "integrity": "sha512-MOQHpzllWxDCHHaDno30hhLfbouoYlOI8YlMNtvKe1zXbjEVhbcEovQxvZrPvtiYW630GQDoMMarCnjfyfHA+A==",
      "license": "MIT"
    }
  }
}

{
  "name": "verify-tiny-relative-date",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "tiny-relative-date": "1.3.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/tiny-relative-date@1.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/tiny-relative-date@1.3.0"
  ]
}

import assert from 'node:assert/strict';
import relativeDate from 'tiny-relative-date';
import relativeDateFactory from 'tiny-relative-date/lib/factory.js';
import enShort from 'tiny-relative-date/translations/en-short.js';

const now = new Date(2026, 5, 15, 12, 0, 0);

// 1. Default relativeDate (English translations)
assert.equal(relativeDate(new Date(now.getTime() - 15 * 1000), now), 'just now');
assert.equal(relativeDate(new Date(now.getTime() - 45 * 1000), now), '45 seconds ago');
assert.equal(relativeDate(new Date(now.getTime() - 90 * 1000), now), 'a minute ago');
assert.equal(relativeDate(new Date(now.getTime() - 30 * 60 * 1000), now), '30 minutes ago');
assert.equal(relativeDate(new Date(now.getTime() - 90 * 60 * 1000), now), 'an hour ago');
assert.equal(relativeDate(new Date(now.getTime() - 6 * 3600 * 1000), now), '6 hours ago');
assert.equal(relativeDate(new Date(2026, 5, 14, 10, 0, 0), now), 'yesterday');
assert.equal(relativeDate(new Date(2026, 5, 11, 12, 0, 0), now), '4 days ago');
assert.equal(relativeDate(new Date(now.getTime() - 10 * 86400 * 1000), now), 'a week ago');
assert.equal(relativeDate(new Date(now.getTime() - 21 * 86400 * 1000), now), '3 weeks ago');
assert.equal(relativeDate(new Date(now.getTime() - 45 * 86400 * 1000), now), 'a month ago');
assert.equal(relativeDate(new Date(now.getTime() - 120 * 86400 * 1000), now), '4 months ago');
assert.equal(relativeDate(new Date(now.getTime() - 400 * 86400 * 1000), now), 'a year ago');
assert.equal(relativeDate(new Date(now.getTime() - 800 * 86400 * 1000), now), 'over a year ago');

// Future dates (note: when delta is between 1 day and 1 week, date is truncated to local midnight)
assert.equal(relativeDate(new Date(now.getTime() + 45 * 1000), now), '45 seconds from now');
assert.equal(relativeDate(new Date(now.getTime() + 90 * 1000), now), 'a minute from now');
assert.equal(relativeDate(new Date(now.getTime() + 15 * 60 * 1000), now), '15 minutes from now');
assert.equal(relativeDate(new Date(2026, 5, 17, 2, 0, 0), now), 'tomorrow');

// String / timestamp coercion
assert.equal(relativeDate(new Date(now.getTime() - 30 * 60 * 1000).toISOString(), now), '30 minutes ago');
assert.equal(relativeDate(now.getTime() - 120 * 1000, now), '2 minutes ago');

// 2. Factory with en-short translations
const shortRelativeDate = relativeDateFactory(enShort);
assert.equal(shortRelativeDate(new Date(now.getTime() - 30 * 60 * 1000), now), '30m');
assert.equal(shortRelativeDate(new Date(now.getTime() - 6 * 3600 * 1000), now), '6h');

// 3. Factory with custom function & template translations
const customRelativeDate = relativeDateFactory({
  justNow: 'now',
  minutesAgo: (time) => `${time} min past`,
  minutesFromNow: 'in {{time}} min'
});
assert.equal(customRelativeDate(new Date(now.getTime() - 10 * 1000), now), 'now');
assert.equal(customRelativeDate(new Date(now.getTime() - 20 * 60 * 1000), now), '20 min past');
assert.equal(customRelativeDate(new Date(now.getTime() + 20 * 60 * 1000), now), 'in 20 min');