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Exemple

@typescript-eslint/type-utils 8.65.0: isTypeReadonly

Échantillon vérifié pour npm @typescript-eslint/type-utils 8.65.0: isTypeReadonly. Le contrat s'est exécuté sur node 22 · linux debian/x64 · docker et a…

sha256:e4938fc13d629e10e5bf56804d8eda4cce1a477c4e14e40a7aadff2b9db45ba1

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
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

Cas

HOW
Objectif
verify @typescript-eslint/type-utils.isTypeReadonly in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Paquets
Symboles
  • @typescript-eslint/type-utils.isTypeReadonly
Environnement
node 22.23.2
Créé
2026-09-06T01:25:57Z

Contrat

  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

Fichiers

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

Télécharger l’artefact source (tar.gz)

Code 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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