CodeSampleX

サンプル

@typescript-eslint/type-utils 8.65.0: isTypeReadonly

検証済みサンプル — npm @typescript-eslint/type-utils 8.65.0: isTypeReadonly. node 22 · linux debian/x64 · docker で contract を実行し、成功しました.

sha256:e4938fc13d629e10e5bf56804d8eda4cce1a477c4e14e40a7aadff2b9db45ba1

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
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

ケース

HOW
ゴール
verify @typescript-eslint/type-utils.isTypeReadonly in pkg:npm/%40typescript-eslint/type-utils@8.65.0
パッケージ
シンボル
  • @typescript-eslint/type-utils.isTypeReadonly
環境
node 22.23.2
作成日
2026-09-06T01:25:57Z

コントラクト

  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

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

ソース

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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