tiny-relative-date 1.3.0: factory

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 factory in 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
Demonstrate these symbols/APIs:
  - factory

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:sha256:55ee61802eaafe7ac2409a1e87a5d692fb2214b87a18803e55137b8d15694f06","contract":["factory(translations) returns a relativeDate(date, now?) formatter function bound to the supplied translation map","String translation entries replace the {{time}} placeholder with the floored unit delta for *Ago and *FromNow keys","Function translation entries receive the numeric unit delta and return the formatted relative string","Deltas under 30 seconds resolve to the justNow key regardless of past or future direction"],"goal":"verify factory in pkg:npm/tiny-relative-date@1.3.0","kind":"HOW","packages":["pkg:npm/tiny-relative-date@1.3.0"],"schemaVersion":1,"symbols":["factory"]},"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":["factory"],"verifierAdapter":"node-typescript@1"}

{
  "name": "tiny-relative-date-factory-sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "tiny-relative-date-factory-sample",
      "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": "tiny-relative-date-factory-sample",
  "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 factory in pkg:npm/tiny-relative-date@1.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/tiny-relative-date@1.3.0"
  ],
  "symbols": [
    "factory"
  ]
}

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

assert.equal(typeof factory, 'function');

// 1. Factory with built-in short locale translations
const shortRelativeDate = factory(enShort);
assert.equal(typeof shortRelativeDate, 'function');

const now = new Date('2025-01-15T12:00:00Z');
assert.equal(shortRelativeDate(new Date('2025-01-15T11:59:45Z'), now), 'now');
assert.equal(shortRelativeDate(new Date('2025-01-15T11:59:15Z'), now), '45s');
assert.equal(shortRelativeDate(new Date('2025-01-15T10:00:00Z'), now), '2h');
assert.equal(shortRelativeDate(new Date('2025-01-15T14:00:00Z'), now), '+2h');

// 2. Factory with custom string template ({{time}}) and function translations
const customRelativeDate = factory({
  justNow: 'right now',
  minutesAgo: '{{time}} mins ago',
  hoursAgo: (hours) => `${hours * 60}m elapsed`,
  hoursFromNow: 'in {{time}}h'
});

assert.equal(customRelativeDate('2025-01-15T12:00:00Z', now), 'right now');
assert.equal(customRelativeDate(new Date('2025-01-15T11:55:00Z'), now), '5 mins ago');
assert.equal(customRelativeDate(new Date('2025-01-15T09:00:00Z'), now), '180m elapsed');
assert.equal(customRelativeDate(new Date('2025-01-15T15:00:00Z'), now), 'in 3h');