chalk 6.0.0: Make chalk emit colour codes when output is piped instead of silently producing plain text

{"case":{"caseId":"case:sha256:4f225f309d232939cc44a9927c1c27af6ca4989327fd39d40e8dc95422c1ede7","constraints":{"moduleSystem":"esm","runtime":"node"},"contract":["construct a Chalk instance with an explicit level","assert the styled string contains the expected ANSI escape codes","assert a level 0 instance returns the text unchanged"],"goal":"Make chalk emit colour codes when output is piped instead of silently producing plain text","kind":"FIX","packages":["pkg:npm/chalk@6.0.0"],"schemaVersion":1,"symbols":["Chalk"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"node","moduleSystem":"esm","os":"linux","packageManager":"npm","runtime":"node","runtimeVersion":"22","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/chalk@6.0.0"],"schemaVersion":1,"symbols":["Chalk"],"verifierAdapter":"node-typescript@1"}

{
  "name": "csx-sample-chalk-forced-color",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "csx-sample-chalk-forced-color",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "chalk": "6.0.0"
      }
    },
    "node_modules/chalk": {
      "version": "6.0.0",
      "resolved": "https://registry.npmjs.org/chalk/-/chalk-6.0.0.tgz",
      "integrity": "sha512-2uNTXIuTTxk7ciZgAU1BQcgnchcG0xXnrs6jzkQfj9SsRa9M2s5zE8WT96hS6KmG4MzWHSrvH43DF1m4XRkrFg==",
      "license": "MIT",
      "engines": {
        "node": ">=22"
      },
      "funding": {
        "url": "https://github.com/chalk/chalk?sponsor=1"
      }
    }
  }
}

{
  "name": "csx-sample-chalk-forced-color",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "chalk": "6.0.0"
  }
}

import { Chalk } from 'chalk';

// chalk auto-detects colour support and turns itself OFF when stdout is not
// a TTY — CI logs, pipes and captured output all fall into that case, so the
// usual "chalk prints no colours" report is not a bug. An explicit Chalk
// instance keeps the decision in your code instead of the environment.
export const forced = new Chalk({ level: 1 });
export const plain = new Chalk({ level: 0 });

export function warn(text) {
  return forced.red(text);
}

import { strict as assert } from 'node:assert';
import { warn, plain } from '../src/index.mjs';

const painted = warn('disk full');
assert.equal(painted, '\u001b[31mdisk full\u001b[39m');
assert.ok(painted.includes('\u001b['));

// Level 0 is the state a piped process normally lands in.
assert.equal(plain.red('disk full'), 'disk full');
console.log('CONTRACT PASS: an explicit chalk level decides colour, not the TTY');