tinyrainbow 1.2.0: isSupported

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 tinyrainbow.isSupported in pkg:npm/tinyrainbow@1.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/tinyrainbow@1.2.0
Demonstrate these symbols/APIs:
  - tinyrainbow.isSupported

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:f97ed806340146402a25650619321b24702945d1f1adc9f8893692b2816ebc0a","contract":["isSupported returns a boolean indicating whether terminal color output is supported","isSupported(true) returns true in an interactive terminal when TERM is not dumb","isSupported(true) returns false when the TERM environment variable is dumb","isSupported() returns false when NO_COLOR environment variable is set","isSupported() returns false when process argument contains --no-color","isSupported(false) returns true when FORCE_COLOR environment variable is set","isSupported(false) returns true when process argument contains --color","isSupported(false) returns true when CI environment variable is set"],"goal":"verify tinyrainbow.isSupported in pkg:npm/tinyrainbow@1.2.0","kind":"HOW","packages":["pkg:npm/tinyrainbow@1.2.0"],"schemaVersion":1,"symbols":["tinyrainbow.isSupported"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/tinyrainbow@1.2.0"],"schemaVersion":1,"subject":"pkg:npm/tinyrainbow@1.2.0","symbols":["tinyrainbow.isSupported"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-tinyrainbow-is-supported",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-tinyrainbow-is-supported",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "tinyrainbow": "1.2.0"
      }
    },
    "node_modules/tinyrainbow": {
      "version": "1.2.0",
      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-1.2.0.tgz",
      "integrity": "sha512-weEDEq7Z5eTHPDh4xjX789+fHfF+P8boiFB+0vbWzpbnbsEr/GRaohi/uMKxg8RZMXnl1ItAi/IUHWMsjDV7kQ==",
      "license": "MIT",
      "engines": {
        "node": ">=14.0.0"
      }
    }
  }
}

{
  "name": "sample-tinyrainbow-is-supported",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "tinyrainbow": "1.2.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify tinyrainbow.isSupported in pkg:npm/tinyrainbow@1.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/tinyrainbow@1.2.0"
  ],
  "symbols": [
    "tinyrainbow.isSupported"
  ]
}

import { isSupported } from 'tinyrainbow';

export { isSupported };
export default isSupported;

import assert from 'node:assert/strict';
import { isSupported } from 'tinyrainbow';
import defaultIsSupported from '../src/index.mjs';

const originalEnv = { ...process.env };
const originalArgv = [...process.argv];

function cleanEnv() {
  delete process.env.NO_COLOR;
  delete process.env.FORCE_COLOR;
  delete process.env.CI;
  process.env.TERM = 'xterm-256color';
  process.argv = process.argv.filter(arg => arg !== '--no-color' && arg !== '--color');
}

// 1. isSupported returns a boolean indicating whether terminal color output is supported
{
  const result = isSupported();
  assert.equal(typeof result, 'boolean');
  const defaultResult = defaultIsSupported();
  assert.equal(typeof defaultResult, 'boolean');
}

// 2. isSupported(true) returns true in an interactive terminal when TERM is not dumb
{
  try {
    cleanEnv();
    assert.equal(isSupported(true), true);
  } finally {
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

// 3. isSupported(true) returns false when the TERM environment variable is dumb
{
  try {
    cleanEnv();
    process.env.TERM = 'dumb';
    assert.equal(isSupported(true), false);
  } finally {
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

// 4. isSupported() returns false when NO_COLOR environment variable is set
{
  try {
    cleanEnv();
    process.env.NO_COLOR = '1';
    assert.equal(isSupported(true), false);
    assert.equal(isSupported(false), false);
  } finally {
    delete process.env.NO_COLOR;
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

// 5. isSupported() returns false when process argument contains --no-color
{
  try {
    cleanEnv();
    process.argv.push('--no-color');
    assert.equal(isSupported(true), false);
    assert.equal(isSupported(false), false);
  } finally {
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

// 6. isSupported(false) returns true when FORCE_COLOR environment variable is set
{
  try {
    cleanEnv();
    process.env.TERM = 'dumb';
    process.env.FORCE_COLOR = '1';
    assert.equal(isSupported(false), true);
  } finally {
    delete process.env.FORCE_COLOR;
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

// 7. isSupported(false) returns true when process argument contains --color
{
  try {
    cleanEnv();
    process.env.TERM = 'dumb';
    process.argv.push('--color');
    assert.equal(isSupported(false), true);
  } finally {
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

// 8. isSupported(false) returns true when CI environment variable is set
{
  try {
    cleanEnv();
    process.env.TERM = 'dumb';
    process.env.CI = 'true';
    assert.equal(isSupported(false), true);
  } finally {
    delete process.env.CI;
    process.env = { ...originalEnv };
    process.argv = [...originalArgv];
  }
}

console.log('Contract tests passed successfully.');