@webassemblyjs/helper-api-error 1.13.2: RuntimeError

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/helper-api-error@1.13.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40webassemblyjs/helper-api-error@1.13.2
Demonstrate these symbols/APIs:
  - RuntimeError

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:sha256:6d17304a7d0e3f32317dc3a75c75b257c0c9c416d4bf2dc1ebe47b7827b624db","contract":["RuntimeError constructs an instance that inherits from Error","RuntimeError preserves custom error message passed to constructor","CompileError and LinkError construct instances that inherit from Error","RuntimeError can be thrown and caught in try-catch block"],"goal":"verify pkg:npm/%40webassemblyjs/helper-api-error@1.13.2","kind":"HOW","packages":["pkg:npm/%40webassemblyjs/helper-api-error@1.13.2"],"schemaVersion":1,"symbols":["RuntimeError"]},"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/%40webassemblyjs/helper-api-error@1.13.2"],"schemaVersion":1,"subject":"pkg:npm/%40webassemblyjs/helper-api-error@1.13.2","symbols":["RuntimeError"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-webassemblyjs-helper-api-error",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-webassemblyjs-helper-api-error",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@webassemblyjs/helper-api-error": "1.13.2"
      }
    },
    "node_modules/@webassemblyjs/helper-api-error": {
      "version": "1.13.2",
      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-api-error/-/helper-api-error-1.13.2.tgz",
      "integrity": "sha512-U56GMYxy4ZQCbDZd6JuvvNV/WFildOjsaWD3Tzzvmw/mas3cXzRJPMjP83JqEsgSbyrmaGjBfDtV7KDXV9UzFQ==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-webassemblyjs-helper-api-error",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@webassemblyjs/helper-api-error": "1.13.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40webassemblyjs/helper-api-error@1.13.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40webassemblyjs/helper-api-error@1.13.2"
  ],
  "symbols": [
    "RuntimeError"
  ]
}

import { RuntimeError, CompileError, LinkError } from "@webassemblyjs/helper-api-error";

export function createRuntimeError(message) {
  return new RuntimeError(message);
}

export function createCompileError(message) {
  return new CompileError(message);
}

export function createLinkError(message) {
  return new LinkError(message);
}

export function throwRuntimeError(message) {
  throw new RuntimeError(message);
}

export { RuntimeError, CompileError, LinkError };

import assert from "node:assert/strict";
import {
  RuntimeError,
  CompileError,
  LinkError,
  createRuntimeError,
  createCompileError,
  createLinkError,
  throwRuntimeError
} from "../src/index.mjs";

// 1. RuntimeError constructs an instance that inherits from Error
{
  const err = createRuntimeError("runtime failure");
  assert(err instanceof Error, "RuntimeError must be an instance of Error");
  assert(err instanceof RuntimeError, "err must be an instance of RuntimeError");
  assert.equal(typeof err.stack, "string", "RuntimeError should have a stack trace");
}

// 2. RuntimeError preserves custom error message passed to constructor
{
  const message = "unreachable execution reached";
  const err = new RuntimeError(message);
  assert.equal(err.message, message);

  const emptyErr = new RuntimeError();
  assert.equal(emptyErr.message, "");
}

// 3. CompileError and LinkError construct instances that inherit from Error
{
  const compileErr = createCompileError("invalid opcode");
  assert(compileErr instanceof Error, "CompileError must be an instance of Error");
  assert(compileErr instanceof CompileError, "compileErr must be an instance of CompileError");
  assert.equal(compileErr.message, "invalid opcode");

  const linkErr = createLinkError("import not found");
  assert(linkErr instanceof Error, "LinkError must be an instance of Error");
  assert(linkErr instanceof LinkError, "linkErr must be an instance of LinkError");
  assert.equal(linkErr.message, "import not found");
}

// 4. RuntimeError can be thrown and caught in try-catch block
{
  let caught = null;
  try {
    throwRuntimeError("divide by zero in wasm function");
  } catch (e) {
    caught = e;
  }

  assert(caught !== null, "Error must be caught");
  assert(caught instanceof RuntimeError);
  assert(caught instanceof Error);
  assert.equal(caught.message, "divide by zero in wasm function");
}

console.log("All @webassemblyjs/helper-api-error contract assertions passed.");