CodeSampleX

Sample

@typescript-eslint/type-utils 8.65.0: isErrorLike

Verified sample for npm @typescript-eslint/type-utils 8.65.0: isErrorLike. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:af6b8871633614632203131208c23bd14469cbeb78edd50b4f0fea9547a65835

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Case

HOW
Goal
verify @typescript-eslint/type-utils.isErrorLike in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Packages
Symbols
  • @typescript-eslint/type-utils.isErrorLike
Environment
node 22.23.2
Created
2026-09-05T18:05:58Z

Contract

  1. isErrorLike returns true for standard built-in Error instances
  2. isErrorLike returns true for custom classes extending Error directly or through class inheritance hierarchy
  3. isErrorLike returns true for built-in error subclasses including TypeError and RangeError
  4. isErrorLike returns true for union types where all constituents are error-like
  5. isErrorLike returns false for union types where any constituent is not error-like
  6. isErrorLike returns true for intersection types containing an error-like type
  7. isErrorLike returns false for classes and objects that mimic error properties but do not extend Error
  8. isErrorLike returns false for primitive types, functions, any, and unknown types
  9. checkIsErrorLike and findErrorLikeNames helper functions correctly validate and filter error-like types

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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 @typescript-eslint/type-utils.isErrorLike in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40typescript-eslint/type-utils@8.65.0
Demonstrate these symbols/APIs:
  - @typescript-eslint/type-utils.isErrorLike

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.
csx.json
{"case":{"caseId":"case:sha256:dbf00fdd04aedb6e0a641179e8caf7bf2c8789052bb67f55327f695b39b52ac8","contract":["isErrorLike returns true for standard built-in Error instances","isErrorLike returns true for custom classes extending Error directly or through class inheritance hierarchy","isErrorLike returns true for built-in error subclasses including TypeError and RangeError","isErrorLike returns true for union types where all constituents are error-like","isErrorLike returns false for union types where any constituent is not error-like","isErrorLike returns true for intersection types containing an error-like type","isErrorLike returns false for classes and objects that mimic error properties but do not extend Error","isErrorLike returns false for primitive types, functions, any, and unknown types","checkIsErrorLike and findErrorLikeNames helper functions correctly validate and filter error-like types"],"goal":"verify @typescript-eslint/type-utils.isErrorLike in pkg:npm/%40typescript-eslint/type-utils@8.65.0","kind":"HOW","packages":["pkg:npm/%40typescript-eslint/type-utils@8.65.0"],"schemaVersion":1,"symbols":["@typescript-eslint/type-utils.isErrorLike"]},"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/%40typescript-eslint/type-utils@8.65.0"],"schemaVersion":1,"subject":"pkg:npm/%40typescript-eslint/type-utils@8.65.0","symbols":["@typescript-eslint/type-utils.isErrorLike"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-typescript-eslint-type-utils-is-error-like",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @typescript-eslint/type-utils isErrorLike",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "license": "MIT-0",
  "dependencies": {
    "@typescript-eslint/type-utils": "8.65.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @typescript-eslint/type-utils.isErrorLike in pkg:npm/%40typescript-eslint/type-utils@8.65.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/type-utils@8.65.0"
  ],
  "symbols": [
    "@typescript-eslint/type-utils.isErrorLike"
  ]
}
src/index.js
const { isErrorLike } = require('@typescript-eslint/type-utils');

/**
 * Checks whether a given TypeScript type represents an Error or Error subclass.
 *
 * @param {import('typescript').Program} program - The TypeScript program context.
 * @param {import('typescript').Type} type - The TypeScript type to evaluate.
 * @returns {boolean} True if the type is Error or inherits from Error.
 */
function checkIsErrorLike(program, type) {
  if (!program || !type) {
    return false;
  }
  return isErrorLike(program, type);
}

/**
 * Filters an array of named types and returns only those that are Error-like.
 *
 * @param {import('typescript').Program} program - The TypeScript program context.
 * @param {Array<{ name: string, type: import('typescript').Type }>} typeEntries - Array of named types.
 * @returns {string[]} Array of names of Error-like types.
 */
function findErrorLikeNames(program, typeEntries) {
  if (!program || !Array.isArray(typeEntries)) {
    return [];
  }
  return typeEntries
    .filter(entry => entry && entry.type && isErrorLike(program, entry.type))
    .map(entry => entry.name);
}

/**
 * Categorizes a type into error-like, union-mixed, or non-error.
 *
 * @param {import('typescript').Program} program - The TypeScript program context.
 * @param {import('typescript').Type} type - The TypeScript type to classify.
 * @returns {'error-like' | 'union-mixed' | 'non-error'}
 */
function classifyTypeClassification(program, type) {
  if (!program || !type) {
    return 'non-error';
  }
  if (isErrorLike(program, type)) {
    return 'error-like';
  }
  if (typeof type.isUnion === 'function' && type.isUnion()) {
    if (type.types && type.types.some(t => isErrorLike(program, t))) {
      return 'union-mixed';
    }
  }
  return 'non-error';
}

module.exports = {
  isErrorLike,
  checkIsErrorLike,
  findErrorLikeNames,
  classifyTypeClassification
};
test/contract.mjs
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const ts = require('typescript');
const {
  isErrorLike,
  checkIsErrorLike,
  findErrorLikeNames,
  classifyTypeClassification
} = require('../src/index.js');

// Set up an in-memory TypeScript environment to evaluate types
const sourceCode = `
  class CustomError extends Error {}
  class CustomSubError extends CustomError {}
  class UnrelatedClass {
    message: string = "not an error";
    name: string = "Unrelated";
  }

  const stdErr: Error = new Error("standard error");
  const customErr: CustomError = new CustomError();
  const subErr: CustomSubError = new CustomSubError();
  const typeErr: TypeError = new TypeError("type error");
  const rangeErr: RangeError = new RangeError("range error");

  const errUnion: Error | TypeError = new Error("union");
  const mixedUnion: Error | string = "mixed";
  const errIntersection: Error & { code: string } = Object.assign(new Error(), { code: "ERR_CODE" });

  const plainObj = { message: "error message", name: "Error" };
  const unrelatedInstance = new UnrelatedClass();
  const numVal: number = 100;
  const strVal: string = "error string";
  const boolVal: boolean = false;
  const fnVal: () => void = () => {};
  const anyVal: any = new Error();
  const unknownVal: unknown = new Error();
`;

const compilerOptions = {
  target: ts.ScriptTarget.ES2022,
  strict: true,
  noEmit: true
};

const host = ts.createCompilerHost(compilerOptions);
const originalGetSourceFile = host.getSourceFile;
host.getSourceFile = (fileName, languageVersion, onError, shouldCreateNewSourceFile) => {
  if (fileName === "virtual.ts") {
    return ts.createSourceFile(fileName, sourceCode, languageVersion, true);
  }
  return originalGetSourceFile(fileName, languageVersion, onError, shouldCreateNewSourceFile);
};

const program = ts.createProgram(["virtual.ts"], compilerOptions, host);
const checker = program.getTypeChecker();
const sf = program.getSourceFile("virtual.ts");

const symbols = new Map();
ts.forEachChild(sf, (node) => {
  if (ts.isVariableStatement(node)) {
    for (const decl of node.declarationList.declarations) {
      const name = decl.name.getText(sf);
      symbols.set(name, checker.getTypeAtLocation(decl));
    }
  }
});

// Contract 1: isErrorLike returns true for standard built-in Error instances
assert.strictEqual(
  isErrorLike(program, symbols.get("stdErr")),
  true,
  "Built-in Error instance should be error-like"
);

// Contract 2: isErrorLike returns true for custom classes extending Error directly or through class inheritance hierarchy
assert.strictEqual(
  isErrorLike(program, symbols.get("customErr")),
  true,
  "Direct Error subclass instance should be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("subErr")),
  true,
  "Indirect subclass inheriting Error should be error-like"
);

// Contract 3: isErrorLike returns true for built-in error subclasses including TypeError and RangeError
assert.strictEqual(
  isErrorLike(program, symbols.get("typeErr")),
  true,
  "TypeError instance should be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("rangeErr")),
  true,
  "RangeError instance should be error-like"
);

// Contract 4: isErrorLike returns true for union types where all constituents are error-like
assert.strictEqual(
  isErrorLike(program, symbols.get("errUnion")),
  true,
  "Union of Error and TypeError should be error-like"
);

// Contract 5: isErrorLike returns false for union types where any constituent is not error-like
assert.strictEqual(
  isErrorLike(program, symbols.get("mixedUnion")),
  false,
  "Union of Error and string should not be error-like"
);

// Contract 6: isErrorLike returns true for intersection types containing an error-like type
assert.strictEqual(
  isErrorLike(program, symbols.get("errIntersection")),
  true,
  "Intersection of Error with object property should be error-like"
);

// Contract 7: isErrorLike returns false for classes and objects that mimic error properties but do not extend Error
assert.strictEqual(
  isErrorLike(program, symbols.get("unrelatedInstance")),
  false,
  "Class with message and name properties not extending Error should not be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("plainObj")),
  false,
  "Plain object literal with error properties should not be error-like"
);

// Contract 8: isErrorLike returns false for primitive types, functions, any, and unknown types
assert.strictEqual(
  isErrorLike(program, symbols.get("numVal")),
  false,
  "Number type should not be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("strVal")),
  false,
  "String type should not be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("boolVal")),
  false,
  "Boolean type should not be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("fnVal")),
  false,
  "Function type should not be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("anyVal")),
  false,
  "Any type should not be error-like"
);
assert.strictEqual(
  isErrorLike(program, symbols.get("unknownVal")),
  false,
  "Unknown type should not be error-like"
);

// Contract 9: checkIsErrorLike and findErrorLikeNames helper functions correctly validate and filter error-like types
assert.strictEqual(checkIsErrorLike(program, symbols.get("stdErr")), true);
assert.strictEqual(checkIsErrorLike(program, null), false);
assert.strictEqual(checkIsErrorLike(null, symbols.get("stdErr")), false);

const entries = [
  { name: "stdErr", type: symbols.get("stdErr") },
  { name: "numVal", type: symbols.get("numVal") },
  { name: "customErr", type: symbols.get("customErr") },
  { name: "strVal", type: symbols.get("strVal") }
];
const errorNames = findErrorLikeNames(program, entries);
assert.deepStrictEqual(errorNames, ["stdErr", "customErr"]);
assert.deepStrictEqual(findErrorLikeNames(null, entries), []);

assert.strictEqual(classifyTypeClassification(program, symbols.get("stdErr")), "error-like");
assert.strictEqual(classifyTypeClassification(program, symbols.get("mixedUnion")), "union-mixed");
assert.strictEqual(classifyTypeClassification(program, symbols.get("numVal")), "non-error");

console.log("All contract assertions passed successfully.");

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