CodeSampleX

Sample

@typescript-eslint/type-utils 8.66.0

Verified sample for npm @typescript-eslint/type-utils 8.66.0. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:2fc76f4fcf97372821bf55d9137609b6fd7610ddbfad1b44e747df112a76c644

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 alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-21

Case

HOW
Goal
verify pkg:npm/%40typescript-eslint/type-utils@8.66.0
Packages
Environment
node 22.23.2
Created
2026-08-21T09:39:58Z

Contract

  1. assert requiresQuoting identifies identifier strings requiring quotes versus valid unquoted names
  2. assert typeOrValueSpecifiersSchema and readonlynessOptionsDefaults provide expected schemas and defaults
  3. assert isNullableType detects types containing null or undefined in union and primitive types
  4. assert getTypeFlags and isTypeFlagSet evaluate TypeScript TypeFlags on type instances
  5. assert isTypeArrayTypeOrUnionOfArrayTypes detects array types and union of array types
  6. assert isTypeAnyType, isTypeUnknownType, and isTypeNeverType identify any, unknown, and never types
  7. assert isTypeBigIntLiteralType and isTypeTemplateLiteralType identify bigint and template literal types
  8. assert isPromiseLike and isErrorLike identify Promise and Error objects
  9. assert isTypeReadonly differentiates readonly and mutable object structures
  10. assert discriminateAnyType categorizes types into AnyType enum variants

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.cjs

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 pkg:npm/%40typescript-eslint/type-utils@8.66.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40typescript-eslint/type-utils@8.66.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@typescript-eslint/type-utils": "8.66.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40typescript-eslint/type-utils@8.66.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/type-utils@8.66.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.cjs
const assert = require("node:assert/strict");
const ts = require("typescript");
const {
  requiresQuoting,
  isNullableType,
  getTypeFlags,
  isTypeFlagSet,
  isTypeArrayTypeOrUnionOfArrayTypes,
  isTypeNeverType,
  isTypeUnknownType,
  isTypeAnyType,
  isTypeBigIntLiteralType,
  isTypeTemplateLiteralType,
  isPromiseLike,
  isErrorLike,
  isTypeReadonly,
  readonlynessOptionsDefaults,
  typeOrValueSpecifiersSchema,
  discriminateAnyType,
  AnyType
} = require("@typescript-eslint/type-utils");

// 1. assert requiresQuoting identifies identifier strings requiring quotes versus valid unquoted names
assert.strictEqual(requiresQuoting("validIdentifier"), false, "valid identifier should not require quotes");
assert.strictEqual(requiresQuoting("snake_case_prop"), false, "snake case property should not require quotes");
assert.strictEqual(requiresQuoting("kebab-case-prop"), true, "kebab case property requires quotes");
assert.strictEqual(requiresQuoting("123leadingNumber"), true, "leading numbers require quotes");
assert.strictEqual(requiresQuoting("property with space"), true, "spaces require quotes");

// 2. assert typeOrValueSpecifiersSchema and readonlynessOptionsDefaults provide expected schemas and defaults
assert.strictEqual(typeOrValueSpecifiersSchema.type, "array");
assert.ok(Array.isArray(typeOrValueSpecifiersSchema.items.oneOf));
assert.strictEqual(readonlynessOptionsDefaults.treatMethodsAsReadonly, false);

// In-memory TypeScript compilation setup
const sourceText = `
  interface ReadonlyRecord {
    readonly id: number;
    readonly label: string;
  }
  interface MutableRecord {
    id: number;
    label: string;
  }
  class ServiceError extends Error {
    public status: number = 500;
  }

  const numVal: number = 42;
  const nullableVal: string | null = null;
  const undefVal: string | undefined = undefined;
  const arrVal: number[] = [1, 2, 3];
  const unionArrVal: (string | number)[] = ["sample", 10];
  const anyVal: any = {};
  const anyArrVal: any[] = [];
  const unknownVal: unknown = {};
  const neverVal: never = (() => { throw new Error("unreachable"); })();
  const bigintLit: 999n = 999n;
  const templateLit: \`prefix_\${string}\` = "prefix_value";
  const promiseVal: Promise<string> = Promise.resolve("resolved");
  const promiseAnyVal: Promise<any> = Promise.resolve(null);
  const errVal: ServiceError = new ServiceError();
  const roRecord: ReadonlyRecord = { id: 1, label: "read-only" };
  const mutRecord: MutableRecord = { id: 2, label: "mutable" };
`;

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, sourceText, 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, { node: decl, type: checker.getTypeAtLocation(decl) });
    }
  }
});

// 3. assert isNullableType detects types containing null or undefined in union and primitive types
assert.strictEqual(isNullableType(symbols.get("nullableVal").type), true);
assert.strictEqual(isNullableType(symbols.get("undefVal").type), true);
assert.strictEqual(isNullableType(symbols.get("numVal").type), false);

// 4. assert getTypeFlags and isTypeFlagSet evaluate TypeScript TypeFlags on type instances
const numType = symbols.get("numVal").type;
const flags = getTypeFlags(numType);
assert.strictEqual(isTypeFlagSet(numType, ts.TypeFlags.Number), true);
assert.strictEqual(isTypeFlagSet(numType, ts.TypeFlags.String), false);
assert.ok(Boolean(flags & ts.TypeFlags.Number));

// 5. assert isTypeArrayTypeOrUnionOfArrayTypes detects array types and union of array types
assert.strictEqual(isTypeArrayTypeOrUnionOfArrayTypes(symbols.get("arrVal").type, checker), true);
assert.strictEqual(isTypeArrayTypeOrUnionOfArrayTypes(symbols.get("unionArrVal").type, checker), true);
assert.strictEqual(isTypeArrayTypeOrUnionOfArrayTypes(symbols.get("numVal").type, checker), false);

// 6. assert isTypeAnyType, isTypeUnknownType, and isTypeNeverType identify any, unknown, and never types
assert.strictEqual(isTypeAnyType(symbols.get("anyVal").type), true);
assert.strictEqual(isTypeAnyType(symbols.get("numVal").type), false);
assert.strictEqual(isTypeUnknownType(symbols.get("unknownVal").type), true);
assert.strictEqual(isTypeUnknownType(symbols.get("numVal").type), false);
assert.strictEqual(isTypeNeverType(symbols.get("neverVal").type), true);
assert.strictEqual(isTypeNeverType(symbols.get("numVal").type), false);

// 7. assert isTypeBigIntLiteralType and isTypeTemplateLiteralType identify bigint and template literal types
assert.strictEqual(isTypeBigIntLiteralType(symbols.get("bigintLit").type), true);
assert.strictEqual(isTypeBigIntLiteralType(symbols.get("numVal").type), false);
assert.strictEqual(isTypeTemplateLiteralType(symbols.get("templateLit").type), true);
assert.strictEqual(isTypeTemplateLiteralType(symbols.get("numVal").type), false);

// 8. assert isPromiseLike and isErrorLike identify Promise and Error objects
assert.strictEqual(isPromiseLike(program, symbols.get("promiseVal").type), true);
assert.strictEqual(isPromiseLike(program, symbols.get("numVal").type), false);
assert.strictEqual(isErrorLike(program, symbols.get("errVal").type), true);
assert.strictEqual(isErrorLike(program, symbols.get("numVal").type), false);

// 9. assert isTypeReadonly differentiates readonly and mutable object structures
assert.strictEqual(isTypeReadonly(program, symbols.get("roRecord").type), true);
assert.strictEqual(isTypeReadonly(program, symbols.get("mutRecord").type), false);

// 10. assert discriminateAnyType categorizes types into AnyType enum variants
assert.strictEqual(discriminateAnyType(symbols.get("anyVal").type, checker, program, symbols.get("anyVal").node), AnyType.Any);
assert.strictEqual(discriminateAnyType(symbols.get("anyArrVal").type, checker, program, symbols.get("anyArrVal").node), AnyType.AnyArray);
assert.strictEqual(discriminateAnyType(symbols.get("promiseAnyVal").type, checker, program, symbols.get("promiseAnyVal").node), AnyType.PromiseAny);
assert.strictEqual(discriminateAnyType(symbols.get("numVal").type, checker, program, symbols.get("numVal").node), AnyType.Safe);

console.log("All @typescript-eslint/type-utils contract assertions passed.");

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