call-bound 1.0.4

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/call-bound@1.0.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/call-bound@1.0.4

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:d9c559d1b9a37ee90b9ffa04f0d251910c21ee477409ca270387980ff2dcb932","contract":["callBound returns bound function for standard intrinsic methods","bound Array.prototype.slice extracts array slices without direct prototype invocation","bound String.prototype.indexOf searches strings with substring and index parameters","bound Object.prototype.hasOwnProperty checks property existence on null-prototype objects","supports intrinsic names enclosed with percent signs","supports allowMissing parameter returning undefined for nonexistent methods on valid intrinsics","throws TypeError when requesting nonexistent method without allowMissing flag"],"goal":"verify pkg:npm/call-bound@1.0.4","kind":"HOW","packages":["pkg:npm/call-bound@1.0.4"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/call-bound@1.0.4"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}

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  "requires": true,
  "packages": {
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      "funding": {
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}

{
  "name": "sample-call-bound",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of call-bound",
  "main": "src/index.js",
  "dependencies": {
    "call-bound": "1.0.4"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/call-bound@1.0.4",
  "kind": "HOW",
  "packages": [
    "pkg:npm/call-bound@1.0.4"
  ]
}

const callBound = require('call-bound');

/**
 * Get a call-bound intrinsic function by name.
 * @param {string} name - The intrinsic name (e.g. 'Array.prototype.slice')
 * @param {boolean} [allowMissing=false] - Whether to return undefined if missing
 * @returns {Function|undefined} Call-bound function
 */
function getCallBound(name, allowMissing = false) {
  return callBound(name, allowMissing);
}

const slice = callBound('Array.prototype.slice');
const indexOf = callBound('String.prototype.indexOf');
const hasOwnProperty = callBound('Object.prototype.hasOwnProperty');

module.exports = {
  callBound,
  getCallBound,
  slice,
  indexOf,
  hasOwnProperty
};

import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  callBound,
  getCallBound,
  slice,
  indexOf,
  hasOwnProperty
} = require('../src/index.js');

// 1. Export verification
assert.strictEqual(typeof callBound, 'function', 'callBound should be a function');
assert.strictEqual(typeof getCallBound, 'function', 'getCallBound should be a function');
assert.strictEqual(typeof slice, 'function', 'slice should be a function');
assert.strictEqual(typeof indexOf, 'function', 'indexOf should be a function');
assert.strictEqual(typeof hasOwnProperty, 'function', 'hasOwnProperty should be a function');

// 2. Call-bound Array.prototype.slice works on arrays
const arr = [10, 20, 30, 40, 50];
assert.deepStrictEqual(slice(arr, 1, 3), [20, 30]);
assert.deepStrictEqual(slice(arr, 2), [30, 40, 50]);

// 3. Call-bound String.prototype.indexOf works on strings
const text = 'hello world';
assert.strictEqual(indexOf(text, 'world'), 6);
assert.strictEqual(indexOf(text, 'xyz'), -1);
assert.strictEqual(indexOf(text, 'o', 5), 7);

// 4. Call-bound Object.prototype.hasOwnProperty works safely on null-prototype objects
const nullProtoObj = Object.create(null);
nullProtoObj.targetKey = 'targetValue';
assert.strictEqual(hasOwnProperty(nullProtoObj, 'targetKey'), true);
assert.strictEqual(hasOwnProperty(nullProtoObj, 'nonExistentKey'), false);

// 5. Supports %-wrapped intrinsic syntax
const boundPush = getCallBound('%Array.prototype.push%');
const targetArr = [1, 2];
boundPush(targetArr, 3, 4);
assert.deepStrictEqual(targetArr, [1, 2, 3, 4]);

// 6. Supports allowMissing parameter returning undefined for nonexistent methods on valid intrinsics
const missingMethod = getCallBound('Array.prototype.nonExistentMethod', true);
assert.strictEqual(missingMethod, undefined);

// 7. Throws TypeError when requesting nonexistent method without allowMissing flag
assert.throws(() => {
  getCallBound('Array.prototype.nonExistentMethod');
}, TypeError);

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