CodeSampleX

Sample

@typescript-eslint/type-utils 8.65.0: isTypeReadonly

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

sha256:e4938fc13d629e10e5bf56804d8eda4cce1a477c4e14e40a7aadff2b9db45ba1

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…		 2026-09-06

Case

HOW
Goal
verify @typescript-eslint/type-utils.isTypeReadonly in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Packages
Symbols
  • @typescript-eslint/type-utils.isTypeReadonly
Environment
node 22.23.2
Created
2026-09-06T01:25:57Z

Contract

  1. isTypeReadonly returns true for primitive types and pure function types
  2. isTypeReadonly returns true for objects with readonly properties and deep readonly nested objects
  3. isTypeReadonly returns false for objects with mutable properties or shallow readonly objects with mutable nested properties
  4. isTypeReadonly returns true for readonly array types and readonly tuple types whose elements are readonly
  5. isTypeReadonly returns false for standard mutable array types and mutable tuple types
  6. isTypeReadonly returns true for union types where all constituents are readonly
  7. isTypeReadonly returns false for union types where any constituent is mutable
  8. isTypeReadonly respects treatMethodsAsReadonly option for objects containing method signatures
  9. checkIsTypeReadonly and filterReadonlyTypeNames helper functions correctly validate and filter readonly 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.isTypeReadonly 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.isTypeReadonly

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:sha256:8cecc03c3c4c630d48e23ad93a0ff642ee741e1a911a8efa9aa782a89745902c","contract":["isTypeReadonly returns true for primitive types and pure function types","isTypeReadonly returns true for objects with readonly properties and deep readonly nested objects","isTypeReadonly returns false for objects with mutable properties or shallow readonly objects with mutable nested properties","isTypeReadonly returns true for readonly array types and readonly tuple types whose elements are readonly","isTypeReadonly returns false for standard mutable array types and mutable tuple types","isTypeReadonly returns true for union types where all constituents are readonly","isTypeReadonly returns false for union types where any constituent is mutable","isTypeReadonly respects treatMethodsAsReadonly option for objects containing method signatures","checkIsTypeReadonly and filterReadonlyTypeNames helper functions correctly validate and filter readonly types"],"goal":"verify @typescript-eslint/type-utils.isTypeReadonly 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.isTypeReadonly"]},"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.isTypeReadonly"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-typescript-eslint-type-utils-is-type-readonly",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @typescript-eslint/type-utils isTypeReadonly",
  "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.isTypeReadonly 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.isTypeReadonly"
  ]
}
src/index.js
const { isTypeReadonly, readonlynessOptionsDefaults } = require('@typescript-eslint/type-utils');

/**
 * Safely checks whether a given TypeScript type is readonly.
 *
 * @param {import('typescript').Program} program - The TypeScript program context.
 * @param {import('typescript').Type} type - The TypeScript type to check.
 * @param {import('@typescript-eslint/type-utils').ReadonlynessOptions} [options] - Options for checking readonlyness.
 * @returns {boolean} True if the type is readonly, false otherwise.
 */
function checkIsTypeReadonly(program, type, options) {
  if (!program || !type) {
    return false;
  }
  return isTypeReadonly(program, type, options);
}

/**
 * Filters an array of named types and returns only the names of readonly types.
 *
 * @param {import('typescript').Program} program - The TypeScript program context.
 * @param {Array<{ name: string, type: import('typescript').Type }>} typeEntries - Array of named types.
 * @param {import('@typescript-eslint/type-utils').ReadonlynessOptions} [options] - Options for checking readonlyness.
 * @returns {string[]} Array of names of types that are readonly.
 */
function filterReadonlyTypeNames(program, typeEntries, options) {
  if (!program || !Array.isArray(typeEntries)) {
    return [];
  }
  return typeEntries
    .filter(entry => entry && entry.type && isTypeReadonly(program, entry.type, options))
    .map(entry => entry.name);
}

/**
 * Classifies a type as readonly, mutable, or invalid.
 *
 * @param {import('typescript').Program} program - The TypeScript program context.
 * @param {import('typescript').Type} type - The TypeScript type to check.
 * @param {import('@typescript-eslint/type-utils').ReadonlynessOptions} [options] - Options for checking readonlyness.
 * @returns {'readonly' | 'mutable' | 'invalid'}
 */
function classifyReadonlyness(program, type, options) {
  if (!program || !type) {
    return 'invalid';
  }
  return isTypeReadonly(program, type, options) ? 'readonly' : 'mutable';
}

module.exports = {
  isTypeReadonly,
  readonlynessOptionsDefaults,
  checkIsTypeReadonly,
  filterReadonlyTypeNames,
  classifyReadonlyness
};
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 {
  isTypeReadonly,
  readonlynessOptionsDefaults,
  checkIsTypeReadonly,
  filterReadonlyTypeNames,
  classifyReadonlyness
} = require('../src/index.js');

// Set up in-memory TypeScript environment to evaluate types
const sourceCode = `
  type PrimitiveNum = number;
  type PrimitiveStr = string;
  type PureFn = () => void;

  interface ReadonlyObj {
    readonly foo: string;
  }

  interface DeepReadonlyObj {
    readonly nested: { readonly a: number };
  }

  interface MutableObj {
    foo: string;
  }

  interface ShallowReadonlyObj {
    readonly nested: { a: number };
  }

  type RoArray = readonly number[];
  type RoTuple = readonly [number, string];

  type MutArray = number[];
  type MutTuple = [number, string];

  type RoUnion = number | readonly string[];
  type MixedUnion = number | string[];

  interface WithMethod {
    readonly name: string;
    greet(): void;
  }
`;

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 types = new Map();
ts.forEachChild(sf, (node) => {
  if (ts.isTypeAliasDeclaration(node) || ts.isInterfaceDeclaration(node)) {
    const name = node.name.text;
    const type = checker.getTypeAtLocation(node);
    types.set(name, type);
  }
});

// Contract 1: isTypeReadonly returns true for primitive types and pure function types
assert.strictEqual(
  isTypeReadonly(program, types.get("PrimitiveNum")),
  true,
  "Primitive number should be readonly"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("PrimitiveStr")),
  true,
  "Primitive string should be readonly"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("PureFn")),
  true,
  "Pure function type should be readonly"
);

// Contract 2: isTypeReadonly returns true for objects with readonly properties and deep readonly nested objects
assert.strictEqual(
  isTypeReadonly(program, types.get("ReadonlyObj")),
  true,
  "Object with readonly properties should be readonly"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("DeepReadonlyObj")),
  true,
  "Object with recursively readonly properties should be readonly"
);

// Contract 3: isTypeReadonly returns false for objects with mutable properties or shallow readonly objects with mutable nested properties
assert.strictEqual(
  isTypeReadonly(program, types.get("MutableObj")),
  false,
  "Object with mutable property should not be readonly"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("ShallowReadonlyObj")),
  false,
  "Object with mutable nested property should not be readonly"
);

// Contract 4: isTypeReadonly returns true for readonly array types and readonly tuple types whose elements are readonly
assert.strictEqual(
  isTypeReadonly(program, types.get("RoArray")),
  true,
  "Readonly array of primitives should be readonly"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("RoTuple")),
  true,
  "Readonly tuple of primitives should be readonly"
);

// Contract 5: isTypeReadonly returns false for standard mutable array types and mutable tuple types
assert.strictEqual(
  isTypeReadonly(program, types.get("MutArray")),
  false,
  "Standard array should not be readonly"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("MutTuple")),
  false,
  "Standard tuple should not be readonly"
);

// Contract 6: isTypeReadonly returns true for union types where all constituents are readonly
assert.strictEqual(
  isTypeReadonly(program, types.get("RoUnion")),
  true,
  "Union of readonly types should be readonly"
);

// Contract 7: isTypeReadonly returns false for union types where any constituent is mutable
assert.strictEqual(
  isTypeReadonly(program, types.get("MixedUnion")),
  false,
  "Union containing a mutable type should not be readonly"
);

// Contract 8: isTypeReadonly respects treatMethodsAsReadonly option for objects containing method signatures
assert.strictEqual(
  isTypeReadonly(program, types.get("WithMethod")),
  false,
  "Object with method should not be readonly by default"
);
assert.strictEqual(
  isTypeReadonly(program, types.get("WithMethod"), { treatMethodsAsReadonly: true }),
  true,
  "Object with method should be readonly when treatMethodsAsReadonly is enabled"
);

// Contract 9: checkIsTypeReadonly and filterReadonlyTypeNames helper functions correctly validate and filter readonly types
assert.strictEqual(checkIsTypeReadonly(program, types.get("ReadonlyObj")), true);
assert.strictEqual(checkIsTypeReadonly(program, null), false);
assert.strictEqual(checkIsTypeReadonly(null, types.get("ReadonlyObj")), false);

const entries = [
  { name: "ReadonlyObj", type: types.get("ReadonlyObj") },
  { name: "MutableObj", type: types.get("MutableObj") },
  { name: "RoArray", type: types.get("RoArray") },
  { name: "MutArray", type: types.get("MutArray") }
];
const readonlyNames = filterReadonlyTypeNames(program, entries);
assert.deepStrictEqual(readonlyNames, ["ReadonlyObj", "RoArray"]);
assert.deepStrictEqual(filterReadonlyTypeNames(null, entries), []);

assert.strictEqual(classifyReadonlyness(program, types.get("ReadonlyObj")), "readonly");
assert.strictEqual(classifyReadonlyness(program, types.get("MutableObj")), "mutable");
assert.strictEqual(classifyReadonlyness(program, null), "invalid");

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

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