isbinaryfile 5.0.7

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/isbinaryfile@5.0.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/isbinaryfile@5.0.7

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:be46dbfad1d9a2ea74afaa96ed1ee920208633348a2ab25e00d7927408b64652","contract":["isBinaryFileSync identifies text buffer as not binary","isBinaryFileSync identifies buffer with null byte as binary","isBinaryFile identifies text buffer as not binary asynchronously","isBinaryFile identifies buffer with null byte as binary asynchronously"],"goal":"verify pkg:npm/isbinaryfile@5.0.7","kind":"HOW","packages":["pkg:npm/isbinaryfile@5.0.7"],"schemaVersion":1},"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/isbinaryfile@5.0.7"],"schemaVersion":1,"subject":"pkg:npm/isbinaryfile@5.0.7","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-isbinaryfile",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-isbinaryfile",
      "version": "1.0.0",
      "dependencies": {
        "isbinaryfile": "5.0.7"
      }
    },
    "node_modules/isbinaryfile": {
      "version": "5.0.7",
      "resolved": "https://registry.npmjs.org/isbinaryfile/-/isbinaryfile-5.0.7.tgz",
      "integrity": "sha512-gnWD14Jh3FzS3CPhF0AxNOJ8CxqeblPTADzI38r0wt8ZyQl5edpy75myt08EG2oKvpyiqSqsx+Wkz9vtkbTqYQ==",
      "license": "MIT",
      "engines": {
        "node": ">= 18.0.0"
      },
      "funding": {
        "url": "https://github.com/sponsors/gjtorikian/"
      }
    }
  }
}

{
  "name": "sample-isbinaryfile",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "isbinaryfile": "5.0.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/isbinaryfile@5.0.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/isbinaryfile@5.0.7"
  ]
}

import assert from "node:assert/strict";
import { isBinaryFile, isBinaryFileSync } from "isbinaryfile";

// 1. isBinaryFileSync identifies text buffer as not binary
const textBuffer = Buffer.from("Hello, this is a plain text string.\nSecond line.\n");
assert.equal(isBinaryFileSync(textBuffer), false);

// 2. isBinaryFileSync identifies buffer with null byte as binary
const binaryBuffer = Buffer.from([0x00, 0x01, 0x02, 0xfe, 0xff]);
assert.equal(isBinaryFileSync(binaryBuffer), true);

// 3. isBinaryFile identifies text buffer as not binary asynchronously
const textResult = await isBinaryFile(textBuffer);
assert.equal(textResult, false);

// 4. isBinaryFile identifies buffer with null byte as binary asynchronously
const binaryResult = await isBinaryFile(binaryBuffer);
assert.equal(binaryResult, true);