CodeSampleX

Sample

@typescript-eslint/type-utils 8.65.0: isTypeArrayTypeOrUnionOfArrayTypes

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

sha256:d5f4d01d62b97af605f31a6027cf94c8e430f9f4606b1d056e582fd9441e7ffe

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.isTypeArrayTypeOrUnionOfArrayTypes in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Packages
Symbols
  • @typescript-eslint/type-utils.isTypeArrayTypeOrUnionOfArrayTypes
Environment
node 22.23.2
Created
2026-09-05T21:40:02Z

Contract

  1. isTypeArrayTypeOrUnionOfArrayTypes returns true for standard array types and generic Array types
  2. isTypeArrayTypeOrUnionOfArrayTypes returns true for readonly array types and multidimensional array types
  3. isTypeArrayTypeOrUnionOfArrayTypes returns true for union types composed solely of array types
  4. isTypeArrayTypeOrUnionOfArrayTypes returns false for union types containing non-array types
  5. isTypeArrayTypeOrUnionOfArrayTypes returns false for primitive types, object types, and tuple types
  6. isTypeArrayTypeOrUnionOfArrayTypes returns false for any and unknown types
  7. checkIsTypeArrayTypeOrUnionOfArrayTypes helper safely handles null or undefined inputs
  8. filterArrayTypes and classifyArrayType helper functions correctly categorize and filter 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.isTypeArrayTypeOrUnionOfArrayTypes 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.isTypeArrayTypeOrUnionOfArrayTypes

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
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package-lock.json
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package.json
{
  "name": "sample-typescript-eslint-type-utils-is-type-array-type-or-union-of-array-types",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @typescript-eslint/type-utils isTypeArrayTypeOrUnionOfArrayTypes",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@typescript-eslint/type-utils": "8.65.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @typescript-eslint/type-utils.isTypeArrayTypeOrUnionOfArrayTypes 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.isTypeArrayTypeOrUnionOfArrayTypes"
  ]
}
src/index.js
'use strict';

const { isTypeArrayTypeOrUnionOfArrayTypes } = require('@typescript-eslint/type-utils');

/**
 * Safely checks if a TypeScript type is an array type or a union made up solely of array types.
 *
 * @param {import('typescript').Type} type - The TypeScript type to evaluate.
 * @param {import('typescript').TypeChecker} checker - The TypeScript type checker.
 * @returns {boolean} True if the type is an array type or union of array types, false otherwise.
 */
function checkIsTypeArrayTypeOrUnionOfArrayTypes(type, checker) {
  if (!type || !checker) {
    return false;
  }
  return isTypeArrayTypeOrUnionOfArrayTypes(type, checker);
}

/**
 * Filters an array of named types and returns only the names of types that are array types
 * or unions composed solely of array types.
 *
 * @param {Array<{ name: string, type: import('typescript').Type }>} typeEntries - List of named types.
 * @param {import('typescript').TypeChecker} checker - The TypeScript type checker.
 * @returns {string[]} Array of names corresponding to array or array-union types.
 */
function filterArrayTypes(typeEntries, checker) {
  if (!Array.isArray(typeEntries) || !checker) {
    return [];
  }
  return typeEntries
    .filter(entry => entry && entry.type && isTypeArrayTypeOrUnionOfArrayTypes(entry.type, checker))
    .map(entry => entry.name);
}

/**
 * Classifies a TypeScript type into categories:
 * - 'array-or-union-of-arrays': array type or union composed solely of array types
 * - 'mixed-union': union type containing both array and non-array types
 * - 'non-array': type containing no array constituents
 *
 * @param {import('typescript').Type} type - The TypeScript type to classify.
 * @param {import('typescript').TypeChecker} checker - The TypeScript type checker.
 * @returns {'array-or-union-of-arrays' | 'mixed-union' | 'non-array'}
 */
function classifyArrayType(type, checker) {
  if (!type || !checker) {
    return 'non-array';
  }
  if (isTypeArrayTypeOrUnionOfArrayTypes(type, checker)) {
    return 'array-or-union-of-arrays';
  }
  if (typeof type.isUnion === 'function' && type.isUnion()) {
    const hasAnyArray = type.types && type.types.some(t => {
      try {
        return checker.isArrayType(t);
      } catch {
        return false;
      }
    });
    if (hasAnyArray) {
      return 'mixed-union';
    }
  }
  return 'non-array';
}

module.exports = {
  isTypeArrayTypeOrUnionOfArrayTypes,
  checkIsTypeArrayTypeOrUnionOfArrayTypes,
  filterArrayTypes,
  classifyArrayType,
};
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 {
  isTypeArrayTypeOrUnionOfArrayTypes,
  checkIsTypeArrayTypeOrUnionOfArrayTypes,
  filterArrayTypes,
  classifyArrayType,
} = require('../src/index.js');

// Set up an in-memory TypeScript environment to evaluate types
const sourceCode = `
  const stdNumArray: number[] = [1, 2, 3];
  const genericStrArray: Array<string> = ['alpha', 'beta'];

  const readonlyNumArray: readonly number[] = [10, 20];
  const multiDimArray: string[][] = [['a', 'b'], ['c']];

  const binaryArrayUnion: number[] | string[] = [1, 2];
  const ternaryArrayUnion: boolean[] | number[] | Array<string> = [true, false];

  const mixedUnionWithPrimitive: number[] | string = 'test';
  const mixedUnionWithNull: number[] | null = null;
  const mixedUnionWithUndefined: Array<boolean> | undefined = undefined;

  const primitiveNum: number = 42;
  const primitiveStr: string = 'hello';
  const primitiveBool: boolean = true;
  const objectLiteral: { id: number; name: string } = { id: 1, name: 'item' };
  const pairTuple: [number, string] = [1, 'first'];
  const emptyTuple: [] = [];

  const anyVal: any = [1, 2, 3];
  const unknownVal: unknown = ['x', 'y'];
`;

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: isTypeArrayTypeOrUnionOfArrayTypes returns true for standard array types and generic Array types
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('stdNumArray'), checker),
  true,
  'Standard number[] should be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('genericStrArray'), checker),
  true,
  'Generic Array<string> should be recognized as array type'
);

// Contract 2: isTypeArrayTypeOrUnionOfArrayTypes returns true for readonly array types and multidimensional array types
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('readonlyNumArray'), checker),
  true,
  'Readonly array readonly number[] should be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('multiDimArray'), checker),
  true,
  'Multidimensional string[][] should be recognized as array type'
);

// Contract 3: isTypeArrayTypeOrUnionOfArrayTypes returns true for union types composed solely of array types
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('binaryArrayUnion'), checker),
  true,
  'Union of number[] | string[] should be recognized as union of array types'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('ternaryArrayUnion'), checker),
  true,
  'Union of boolean[] | number[] | Array<string> should be recognized as union of array types'
);

// Contract 4: isTypeArrayTypeOrUnionOfArrayTypes returns false for union types containing non-array types
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('mixedUnionWithPrimitive'), checker),
  false,
  'Union of number[] | string should not be recognized as union of array types'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('mixedUnionWithNull'), checker),
  false,
  'Union of number[] | null should not be recognized as union of array types'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('mixedUnionWithUndefined'), checker),
  false,
  'Union of Array<boolean> | undefined should not be recognized as union of array types'
);

// Contract 5: isTypeArrayTypeOrUnionOfArrayTypes returns false for primitive types, object types, and tuple types
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('primitiveNum'), checker),
  false,
  'Primitive number should not be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('primitiveStr'), checker),
  false,
  'Primitive string should not be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('primitiveBool'), checker),
  false,
  'Primitive boolean should not be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('objectLiteral'), checker),
  false,
  'Object literal type should not be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('pairTuple'), checker),
  false,
  'Tuple [number, string] should not be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('emptyTuple'), checker),
  false,
  'Empty tuple [] should not be recognized as array type'
);

// Contract 6: isTypeArrayTypeOrUnionOfArrayTypes returns false for any and unknown types
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('anyVal'), checker),
  false,
  'any type should not be recognized as array type'
);
assert.strictEqual(
  isTypeArrayTypeOrUnionOfArrayTypes(symbols.get('unknownVal'), checker),
  false,
  'unknown type should not be recognized as array type'
);

// Contract 7: checkIsTypeArrayTypeOrUnionOfArrayTypes helper safely handles null or undefined inputs
assert.strictEqual(
  checkIsTypeArrayTypeOrUnionOfArrayTypes(null, checker),
  false,
  'Null type should safely return false'
);
assert.strictEqual(
  checkIsTypeArrayTypeOrUnionOfArrayTypes(symbols.get('stdNumArray'), null),
  false,
  'Null checker should safely return false'
);
assert.strictEqual(
  checkIsTypeArrayTypeOrUnionOfArrayTypes(undefined, undefined),
  false,
  'Undefined type and checker should safely return false'
);
assert.strictEqual(
  checkIsTypeArrayTypeOrUnionOfArrayTypes(symbols.get('stdNumArray'), checker),
  true,
  'Valid type and checker should return true'
);

// Contract 8: filterArrayTypes and classifyArrayType helper functions correctly categorize and filter types
const sampleEntries = [
  { name: 'stdNumArray', type: symbols.get('stdNumArray') },
  { name: 'primitiveNum', type: symbols.get('primitiveNum') },
  { name: 'binaryArrayUnion', type: symbols.get('binaryArrayUnion') },
  { name: 'mixedUnionWithPrimitive', type: symbols.get('mixedUnionWithPrimitive') },
  { name: 'pairTuple', type: symbols.get('pairTuple') },
];

const filteredNames = filterArrayTypes(sampleEntries, checker);
assert.deepStrictEqual(
  filteredNames,
  ['stdNumArray', 'binaryArrayUnion'],
  'filterArrayTypes should only retain array and array-union types'
);
assert.deepStrictEqual(
  filterArrayTypes(null, checker),
  [],
  'filterArrayTypes with null entries should return empty array'
);
assert.deepStrictEqual(
  filterArrayTypes(sampleEntries, null),
  [],
  'filterArrayTypes with null checker should return empty array'
);

assert.strictEqual(
  classifyArrayType(symbols.get('stdNumArray'), checker),
  'array-or-union-of-arrays'
);
assert.strictEqual(
  classifyArrayType(symbols.get('binaryArrayUnion'), checker),
  'array-or-union-of-arrays'
);
assert.strictEqual(
  classifyArrayType(symbols.get('mixedUnionWithPrimitive'), checker),
  'mixed-union'
);
assert.strictEqual(
  classifyArrayType(symbols.get('primitiveNum'), checker),
  'non-array'
);
assert.strictEqual(
  classifyArrayType(null, checker),
  'non-array'
);

console.log('All isTypeArrayTypeOrUnionOfArrayTypes contract assertions passed successfully.');

Origin Seeder

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