CodeSampleX

Sample

@typescript-eslint/type-utils 8.65.0: isTypeTemplateLiteralType

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

sha256:aafaaed358aa142f6509c10c38fbe1d4587946facb96396f14e1fdcf79f903a0

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.isTypeTemplateLiteralType in pkg:npm/%40typescript-eslint/type-utils@8.65.0
Packages
Symbols
  • @typescript-eslint/type-utils.isTypeTemplateLiteralType
Environment
node 22.23.2
Created
2026-09-06T03:15:20Z

Contract

  1. isTypeTemplateLiteralType returns true for template literal types with string, number, or bigint substitutions
  2. isTypeTemplateLiteralType returns true for generic template literal types and multi-segment template literals
  3. isTypeTemplateLiteralType returns false for plain string literal types and template literals without substitutions
  4. isTypeTemplateLiteralType returns false for template literals expanding solely to finite unions of string literals
  5. isTypeTemplateLiteralType returns false for primitive types, object types, any, and unknown
  6. isTypeTemplateLiteralType returns true for union types containing at least one template literal constituent
  7. isTypeTemplateLiteralType returns false for union types composed entirely of non-template types
  8. isTypeTemplateLiteralType returns false for intersection types even when containing a template literal constituent
  9. checkIsTypeTemplateLiteralType and filterTemplateLiteralTypes helper functions correctly validate and filter 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.isTypeTemplateLiteralType 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.isTypeTemplateLiteralType

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:sha256:0d1ad80f144b094b450b3f173eb43fb426745f1c928c20cb170218f5e67d0a31","contract":["isTypeTemplateLiteralType returns true for template literal types with string, number, or bigint substitutions","isTypeTemplateLiteralType returns true for generic template literal types and multi-segment template literals","isTypeTemplateLiteralType returns false for plain string literal types and template literals without substitutions","isTypeTemplateLiteralType returns false for template literals expanding solely to finite unions of string literals","isTypeTemplateLiteralType returns false for primitive types, object types, any, and unknown","isTypeTemplateLiteralType returns true for union types containing at least one template literal constituent","isTypeTemplateLiteralType returns false for union types composed entirely of non-template types","isTypeTemplateLiteralType returns false for intersection types even when containing a template literal constituent","checkIsTypeTemplateLiteralType and filterTemplateLiteralTypes helper functions correctly validate and filter types"],"goal":"verify @typescript-eslint/type-utils.isTypeTemplateLiteralType 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.isTypeTemplateLiteralType"]},"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.isTypeTemplateLiteralType"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-typescript-eslint-type-utils-is-type-template-literal-type",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @typescript-eslint/type-utils isTypeTemplateLiteralType",
  "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.isTypeTemplateLiteralType 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.isTypeTemplateLiteralType"
  ]
}
src/index.js
'use strict';

const { isTypeTemplateLiteralType } = require('@typescript-eslint/type-utils');

/**
 * Safely checks whether a given TypeScript type is a template literal type.
 * Returns false if the input type is null, undefined, or not a template literal.
 *
 * @param {import('typescript').Type} type - The TypeScript type to evaluate.
 * @returns {boolean} True if the type is or contains a template literal type.
 */
function checkIsTypeTemplateLiteralType(type) {
  if (!type) {
    return false;
  }
  return isTypeTemplateLiteralType(type);
}

/**
 * Filters an array of named types and returns only the names of types that are template literal types.
 *
 * @param {Array<{ name: string, type: import('typescript').Type }>} entries - Array of named type entries.
 * @returns {string[]} Array of names corresponding to template literal types.
 */
function filterTemplateLiteralTypes(entries) {
  if (!Array.isArray(entries)) {
    return [];
  }
  return entries
    .filter(entry => entry && entry.type && isTypeTemplateLiteralType(entry.type))
    .map(entry => entry.name);
}

/**
 * Classifies a TypeScript type based on its template literal characteristics:
 * - 'template-literal': direct template literal type (not a union)
 * - 'union-containing-template': union type that contains at least one template literal constituent
 * - 'non-template': non-template type containing no template literal constituents
 *
 * @param {import('typescript').Type} type - The TypeScript type to classify.
 * @returns {'template-literal' | 'union-containing-template' | 'non-template'}
 */
function classifyTemplateLiteralType(type) {
  if (!type) {
    return 'non-template';
  }
  if (!isTypeTemplateLiteralType(type)) {
    return 'non-template';
  }
  if (typeof type.isUnion === 'function' && type.isUnion()) {
    return 'union-containing-template';
  }
  return 'template-literal';
}

module.exports = {
  isTypeTemplateLiteralType,
  checkIsTypeTemplateLiteralType,
  filterTemplateLiteralTypes,
  classifyTemplateLiteralType,
};
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 {
  isTypeTemplateLiteralType,
  checkIsTypeTemplateLiteralType,
  filterTemplateLiteralTypes,
  classifyTemplateLiteralType,
} = require('../src/index.js');

// Set up an in-memory TypeScript environment to evaluate types
const sourceCode = `
  type TemplateStringSub = \`hello \${string}\`;
  type TemplateNumberSub = \`id:\${number}\`;
  type TemplateBigIntSub = \`count:\${bigint}\`;

  type TemplateMultiSegment = \`prefix-\${string}-\${number}\`;
  type TemplateGeneric<T extends string> = \`gen:\${T}\`;
  type TemplateGenericString = TemplateGeneric<string>;
  type TemplateUnionSub = \`item-\${string}-\${'a' | 'b'}\`;

  type PlainStringLiteral = "literal_string";
  type StaticTemplate = \`plain_static_text\`;

  type BooleanTemplate = \`flag-\${boolean}\`;
  type FiniteUnionTemplate = \`status-\${'active' | 'inactive'}\`;

  type PrimString = string;
  type PrimNumber = number;
  type PrimBoolean = boolean;
  type PlainObject = { id: number; label: string };
  type AnyType = any;
  type UnknownType = unknown;

  type UnionWithTemplate = \`prefix_\${string}\` | number;
  type UnionOfTemplates = \`a_\${string}\` | \`b_\${number}\`;

  type UnionNonTemplatePrimitives = string | number | boolean;
  type UnionStringLiterals = "alpha" | "beta" | "gamma";

  type IntersectWithTemplate = \`prefix_\${string}\` & { metadata: string };
  type IntersectObjects = { a: string } & { b: number };
`;

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 symbols = new Map();
ts.forEachChild(sf, (node) => {
  if (ts.isTypeAliasDeclaration(node)) {
    symbols.set(node.name.text, checker.getTypeFromTypeNode(node.type));
  }
});

// Contract 1: isTypeTemplateLiteralType returns true for template literal types with string, number, or bigint substitutions
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateStringSub')),
  true,
  'Template literal with string substitution should be recognized as template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateNumberSub')),
  true,
  'Template literal with number substitution should be recognized as template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateBigIntSub')),
  true,
  'Template literal with bigint substitution should be recognized as template literal type'
);

// Contract 2: isTypeTemplateLiteralType returns true for generic template literal types and multi-segment template literals
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateMultiSegment')),
  true,
  'Multi-segment template literal should be recognized as template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateGeneric')),
  true,
  'Generic template literal definition should be recognized as template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateGenericString')),
  true,
  'Generic template literal instantiated with string should be recognized as template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('TemplateUnionSub')),
  true,
  'Template literal with union substitution resulting in templates should be recognized'
);

// Contract 3: isTypeTemplateLiteralType returns false for plain string literal types and template literals without substitutions
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('PlainStringLiteral')),
  false,
  'Plain string literal should not be recognized as template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('StaticTemplate')),
  false,
  'Template literal without substitutions reduces to string literal and should return false'
);

// Contract 4: isTypeTemplateLiteralType returns false for template literals expanding solely to finite unions of string literals
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('BooleanTemplate')),
  false,
  'Template literal substituting boolean expands to union of string literals and should return false'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('FiniteUnionTemplate')),
  false,
  'Template literal substituting finite union of string literals should return false'
);

// Contract 5: isTypeTemplateLiteralType returns false for primitive types, object types, any, and unknown
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('PrimString')),
  false,
  'Primitive string should not be template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('PrimNumber')),
  false,
  'Primitive number should not be template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('PrimBoolean')),
  false,
  'Primitive boolean should not be template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('PlainObject')),
  false,
  'Plain object type should not be template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('AnyType')),
  false,
  'Any type should not be template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('UnknownType')),
  false,
  'Unknown type should not be template literal type'
);

// Contract 6: isTypeTemplateLiteralType returns true for union types containing at least one template literal constituent
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('UnionWithTemplate')),
  true,
  'Union containing a template literal constituent should return true via flag decomposition'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('UnionOfTemplates')),
  true,
  'Union of multiple template literals should return true'
);

// Contract 7: isTypeTemplateLiteralType returns false for union types composed entirely of non-template types
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('UnionNonTemplatePrimitives')),
  false,
  'Union of primitive types should return false'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('UnionStringLiterals')),
  false,
  'Union of string literals should return false'
);

// Contract 8: isTypeTemplateLiteralType returns false for intersection types even when containing a template literal constituent
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('IntersectWithTemplate')),
  false,
  'Intersection type containing template literal is not itself a template literal type'
);
assert.strictEqual(
  isTypeTemplateLiteralType(symbols.get('IntersectObjects')),
  false,
  'Intersection of plain objects should return false'
);

// Contract 9: checkIsTypeTemplateLiteralType and filterTemplateLiteralTypes helper functions correctly validate and filter types
assert.strictEqual(
  checkIsTypeTemplateLiteralType(symbols.get('TemplateStringSub')),
  true,
  'checkIsTypeTemplateLiteralType should return true for template type'
);
assert.strictEqual(
  checkIsTypeTemplateLiteralType(null),
  false,
  'checkIsTypeTemplateLiteralType should return false for null input'
);
assert.strictEqual(
  checkIsTypeTemplateLiteralType(undefined),
  false,
  'checkIsTypeTemplateLiteralType should return false for undefined input'
);

const typeEntries = [
  { name: 'TemplateStringSub', type: symbols.get('TemplateStringSub') },
  { name: 'PrimString', type: symbols.get('PrimString') },
  { name: 'TemplateNumberSub', type: symbols.get('TemplateNumberSub') },
  { name: 'PlainStringLiteral', type: symbols.get('PlainStringLiteral') },
  { name: 'InvalidEntry', type: null }
];

const filtered = filterTemplateLiteralTypes(typeEntries);
assert.deepStrictEqual(
  filtered,
  ['TemplateStringSub', 'TemplateNumberSub'],
  'filterTemplateLiteralTypes should return only names of template literal types'
);
assert.deepStrictEqual(
  filterTemplateLiteralTypes(null),
  [],
  'filterTemplateLiteralTypes should return empty array on null input'
);

assert.strictEqual(
  classifyTemplateLiteralType(symbols.get('TemplateStringSub')),
  'template-literal',
  'Direct template literal should be classified as template-literal'
);
assert.strictEqual(
  classifyTemplateLiteralType(symbols.get('UnionWithTemplate')),
  'union-containing-template',
  'Union containing template literal should be classified as union-containing-template'
);
assert.strictEqual(
  classifyTemplateLiteralType(symbols.get('PrimString')),
  'non-template',
  'Primitive string should be classified as non-template'
);
assert.strictEqual(
  classifyTemplateLiteralType(null),
  'non-template',
  'Null input should be classified as non-template'
);

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

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