CodeSampleX

Beispiel

@typescript-eslint/type-utils 8.65.0: isTypeReadonly

Verifiziertes Beispiel für npm @typescript-eslint/type-utils 8.65.0: isTypeReadonly. Der Vertrag lief auf node 22 · linux debian/x64 · docker und bestand.

sha256:e4938fc13d629e10e5bf56804d8eda4cce1a477c4e14e40a7aadff2b9db45ba1

Dieses Netzwerk bietet eine Sache: ein Sample, das baut. Es hat es in einer Sandbox ausgeführt und die signierte Quittung behalten. Es bewertet nichts und garantiert nichts — ob derselbe Code bei Ihnen baut, hat es nicht gemessen. Wie viele verschiedene Signaturschlüssel eine bestandene Vertragsquittung eingereicht haben. Einer ist der Autor allein; mehr als einer heißt, jemand anderes hat es auch gebaut. Ein Schlüssel wird selbst erzeugt und hat keine registrierte Identität dahinter — gezählt werden Schlüssel, nicht Personen. MIT-0

Ausführungsbelege

Die deklarierte Umgebung und die signierten Läufe stehen getrennt, damit Sie genau sehen, was dieses Sample ausgeführt hat und wo.

Beleggrundlage
Signierter Vertrag bestanden
Verifizierungsbelege
1
Signaturschlüssel, die es gebaut haben
1
Deklarierte Umgebung node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Umgebungen der Verifizierungsläufe

Umgebung Contract Stufen Lauf
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

Fall

HOW
Ziel
verify @typescript-eslint/type-utils.isTypeReadonly in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Pakete
Symbole
  • @typescript-eslint/type-utils.isTypeReadonly
Umgebung
node 22.23.2
Erstellt
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

Dateien

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

Quellartefakt herunterladen (tar.gz)

Quelltext

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"}
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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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