@webassemblyjs/floating-point-hex-parser 1.13.2: default

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/%40webassemblyjs/floating-point-hex-parser@1.13.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40webassemblyjs/floating-point-hex-parser@1.13.2
Demonstrate these symbols/APIs:
  - default

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:c281b20675cc11a4cc84ff45e7172104f1abef110e250c181d1d9c988343b19b","contract":["parseHexFloat parses floating point hexadecimal string with negative binary exponent to IEEE 754 float","parseHexFloat parses floating point hexadecimal string with fractional mantissa and positive binary exponent","parseHexFloat parses hexadecimal integer string without exponent component","parseHexFloat correctly preserves negative sign for hexadecimal floating point values"],"goal":"verify pkg:npm/%40webassemblyjs/floating-point-hex-parser@1.13.2","kind":"HOW","packages":["pkg:npm/%40webassemblyjs/floating-point-hex-parser@1.13.2"],"schemaVersion":1,"symbols":["default"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","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/%40webassemblyjs/floating-point-hex-parser@1.13.2"],"schemaVersion":1,"subject":"pkg:npm/%40webassemblyjs/floating-point-hex-parser@1.13.2","symbols":["default"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-floating-point-hex-parser",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-floating-point-hex-parser",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@webassemblyjs/floating-point-hex-parser": "1.13.2"
      }
    },
    "node_modules/@webassemblyjs/floating-point-hex-parser": {
      "version": "1.13.2",
      "resolved": "https://registry.npmjs.org/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.13.2.tgz",
      "integrity": "sha512-6oXyTOzbKxGH4steLbLNOu71Oj+C8Lg34n6CqRvqfS2O71BxY6ByfMDRhBytzknj9yGUPVJ1qIKhRlAwO1AovA==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-floating-point-hex-parser",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@webassemblyjs/floating-point-hex-parser": "1.13.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40webassemblyjs/floating-point-hex-parser@1.13.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40webassemblyjs/floating-point-hex-parser@1.13.2"
  ],
  "symbols": [
    "default"
  ]
}

import parseHexFloatModule from "@webassemblyjs/floating-point-hex-parser";

const rawParse = typeof parseHexFloatModule === "function"
  ? parseHexFloatModule
  : parseHexFloatModule.default;

/**
 * Parses a floating point hexadecimal string into an IEEE 754 number.
 *
 * @param {string} input - Hexadecimal floating point string (e.g., "0x1p-1", "0x1.8p1")
 * @returns {number} The parsed JavaScript number
 */
export function parseHexFloat(input) {
  return rawParse(input);
}

export default parseHexFloat;

import assert from "node:assert/strict";
import parseHexFloatModule from "@webassemblyjs/floating-point-hex-parser";
import { parseHexFloat } from "../src/index.mjs";

const rawParse = typeof parseHexFloatModule === "function"
  ? parseHexFloatModule
  : parseHexFloatModule.default;

// 1. parseHexFloat parses floating point hexadecimal string with negative binary exponent to IEEE 754 float
{
  assert.equal(rawParse("0x1p-1"), 0.5);
  assert.equal(parseHexFloat("0x1p-1"), 0.5);
  assert.equal(parseHexFloat("0x1p-2"), 0.25);
  assert.equal(parseHexFloat("0x1p-3"), 0.125);
}

// 2. parseHexFloat parses floating point hexadecimal string with fractional mantissa and positive binary exponent
{
  assert.equal(rawParse("0x1.8p1"), 3);
  assert.equal(parseHexFloat("0x1.8p1"), 3);
  assert.equal(parseHexFloat("0x1.4p3"), 10);
  assert.equal(parseHexFloat("0x1.921fb54442d18p+2"), 6.283185307179586);
}

// 3. parseHexFloat parses hexadecimal integer string without exponent component
{
  assert.equal(rawParse("0x0"), 0);
  assert.equal(parseHexFloat("0x0"), 0);
  assert.equal(parseHexFloat("0x10"), 16);
  assert.equal(parseHexFloat("0xFF"), 255);
}

// 4. parseHexFloat correctly preserves negative sign for hexadecimal floating point values
{
  assert.equal(rawParse("-0x1p0"), -1);
  assert.equal(parseHexFloat("-0x1p0"), -1);
  assert.equal(parseHexFloat("-0x1p-1"), -0.5);
  assert.equal(parseHexFloat("-0x1.8p1"), -3);
}

console.log("All floating-point-hex-parser contract tests passed successfully.");