CodeSampleX

Sample

typescript 7.0.2: isIdentifier

Verified sample for npm typescript 7.0.2: isIdentifier. The contract ran on node 22 · linux alpine/x64 · docker and passed: isIdentifier returns true for AST…

sha256:00a992eff91ec0a4d4eb1064d9679bce019f40e9c3be928f1127459e65a36fb4

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Case

HOW
Goal
verify typescript.isIdentifier in pkg:npm/typescript@7.0.2
Packages
Symbols
  • typescript.isIdentifier
Created
2026-08-28T07:57:19Z

Contract

  1. isIdentifier returns true for AST Identifier nodes constructed with createIdentifier
  2. isIdentifier returns false for other AST node types such as string and numeric literals
  3. isIdentifier throws TypeError when evaluated on null or undefined
  4. filterIdentifiers filters mixed AST node collections to only valid Identifier nodes
  5. validateIdentifier returns identifier text for valid identifiers and throws TypeError for invalid nodes

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • 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.isIdentifier in pkg:npm/typescript@7.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/typescript@7.0.2
Demonstrate these symbols/APIs:
  - typescript.isIdentifier

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:f8c378ba51a45933dec38541887bf4f5830c189849b487777e707553902f2e0a","contract":["isIdentifier returns true for AST Identifier nodes constructed with createIdentifier","isIdentifier returns false for other AST node types such as string and numeric literals","isIdentifier throws TypeError when evaluated on null or undefined","filterIdentifiers filters mixed AST node collections to only valid Identifier nodes","validateIdentifier returns identifier text for valid identifiers and throws TypeError for invalid nodes"],"goal":"verify typescript.isIdentifier in pkg:npm/typescript@7.0.2","kind":"HOW","packages":["pkg:npm/typescript@7.0.2"],"schemaVersion":1,"symbols":["typescript.isIdentifier"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/typescript@7.0.2"],"schemaVersion":1,"subject":"pkg:npm/typescript@7.0.2","symbols":["typescript.isIdentifier"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-typescript-is-identifier",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-typescript-is-identifier",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "typescript": "7.0.2"
      }
    },
    "node_modules/@typescript/typescript-aix-ppc64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-aix-ppc64/-/typescript-aix-ppc64-7.0.2.tgz",
      "integrity": "sha512-MTKKkWB7p/0E9xi1d1tHtZ5PiLkGEMIq88pK2CubZjOsLtYTLqhgIgi6zepFa+9GHZ6h05NMCkQxGKiPXMxXtQ==",
      "cpu": [
        "ppc64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "aix"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-darwin-arm64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-darwin-arm64/-/typescript-darwin-arm64-7.0.2.tgz",
      "integrity": "sha512-gowzar9MwS/aRWp6f3a4KUqzRjAZjOsmGNCM6LcTgXum+dBfgsBVMN+AgvOCCbguXyick6LJhpBszxMebJ8syA==",
      "cpu": [
        "arm64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "darwin"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-darwin-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-darwin-x64/-/typescript-darwin-x64-7.0.2.tgz",
      "integrity": "sha512-SZ9xZInqApNlNGc9s0W1VSsktYSOe9cFqNOIqmN1Gs8SmkjKZYFt017G4VwPxASInODuAdbTW7sXiFUf893RgA==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "darwin"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-freebsd-arm64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-freebsd-arm64/-/typescript-freebsd-arm64-7.0.2.tgz",
      "integrity": "sha512-W5NH4y/J0plIIS5b2xvTEkU7JFxyqdMAOgf+Ilhl0vHQXKO5dZoxd+C/jEtq56c4F3wk71RB4BMRQ2XdI+bwYQ==",
      "cpu": [
        "arm64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "freebsd"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-freebsd-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-freebsd-x64/-/typescript-freebsd-x64-7.0.2.tgz",
      "integrity": "sha512-UMGDx5sTpzNw3WiPebH7l90IWfJggEd+egHt/q6p7/Cm3zqoV7VxkGXt+3DxPIw8CcmvAB0j3sVVfbhX+M4Tpw==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "freebsd"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-arm": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-arm/-/typescript-linux-arm-7.0.2.tgz",
      "integrity": "sha512-gffT3xPz9sR7j/YJExkyPntrI0P2EP9XbOyWzth2/Gs0RstK+90RBcO0ncXoXy/beYll1SXw846Nf2zdnEz0QQ==",
      "cpu": [
        "arm"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-arm64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-arm64/-/typescript-linux-arm64-7.0.2.tgz",
      "integrity": "sha512-Qh4eU4/y3yDjnfjjyPYihMj5/ODIlmt+Bzu17OI+fiSRDW57QmU5SiN63exPRNJPKUzcc1INa1NXdrJ+MqHjUQ==",
      "cpu": [
        "arm64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-loong64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-loong64/-/typescript-linux-loong64-7.0.2.tgz",
      "integrity": "sha512-uEHck9i8hoAzXPiYRib1O7miOnz23SxIeVl6F4LXox+qov1K35jHcEW6VHKvZI+pyvl7fZEP4MCU5LYvIq1GuQ==",
      "cpu": [
        "loong64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-mips64el": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-mips64el/-/typescript-linux-mips64el-7.0.2.tgz",
      "integrity": "sha512-R4KvAMnE43W5Qeqb0Ly56O3mWMWIAgsMyz36DCaycd5nbg/9kzm0liw3JocfRqyJY0KPmzFjbswozXyW0DnIYA==",
      "cpu": [
        "mips64el"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-ppc64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-ppc64/-/typescript-linux-ppc64-7.0.2.tgz",
      "integrity": "sha512-DORx5b3sd/4S7eayxm4FQv+A7CrkUIGRaHiwI8oiHTAI1fAPWhF4J0vAlkC8biAlHSVVwxMQ3tjZ2/DVbnQiiA==",
      "cpu": [
        "ppc64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-riscv64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-riscv64/-/typescript-linux-riscv64-7.0.2.tgz",
      "integrity": "sha512-wf0jqEDOjrPRnKwYRyyJDRo11KMbvMFrU+q4zqKyChODBzvlkbhNQfKvLxQCcwTpdDaXSHZTVuh0JoCrKCUMHQ==",
      "cpu": [
        "riscv64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-s390x": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-s390x/-/typescript-linux-s390x-7.0.2.tgz",
      "integrity": "sha512-IkwJc3L7yhytWd/ewjyxNDfOmswCm9GWMJT/ue/dU4aZNbwZeYAetq42VyLmsmSjvoX7z74X6ZaYCtzAr0EuGw==",
      "cpu": [
        "s390x"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-linux-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-linux-x64/-/typescript-linux-x64-7.0.2.tgz",
      "integrity": "sha512-EYdf2cNg7rgCWJnxCdJ+F3V39O8ihb37eHAu1LK8oAFizgTQbPOK7zHHXbPt8rX24COqODXeI3sIf0fCXG7H/A==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "linux"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-netbsd-arm64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-netbsd-arm64/-/typescript-netbsd-arm64-7.0.2.tgz",
      "integrity": "sha512-+polYF4MF04aPpO5FTkHran9yUQDSXqy5GiSDKpsll5jy3l3+g9QLhpf39T+ePtefhXLOGrLl0QIjkQP6VnelA==",
      "cpu": [
        "arm64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "netbsd"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-netbsd-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-netbsd-x64/-/typescript-netbsd-x64-7.0.2.tgz",
      "integrity": "sha512-8YIT0EHM/3dq10ZOVF/A7pc/YSMtbcecct4rWtexrnSCHOPcpC2KTLXfTCR6vDpnSiY12heNb1GiN/wu+T/FyA==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "netbsd"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-openbsd-arm64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-openbsd-arm64/-/typescript-openbsd-arm64-7.0.2.tgz",
      "integrity": "sha512-APT8+ClYnuYm1u9+kgGXoMj2VzWzcymwh2gNSQVySHfkRDGOTVkoWLjCmOQSaO+PoqQ57B0flRp9SA+7GnnkzQ==",
      "cpu": [
        "arm64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "openbsd"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-openbsd-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-openbsd-x64/-/typescript-openbsd-x64-7.0.2.tgz",
      "integrity": "sha512-yX7s+Q0Dln0Dt9tEzZsAjXXR/+ytBM7AlglaqyeMPxQszJ1JhlJdZ6jLA+IzldHtflX81em7lDao1xXu+aRRkg==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "openbsd"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-sunos-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-sunos-x64/-/typescript-sunos-x64-7.0.2.tgz",
      "integrity": "sha512-dLJDGaLZ1D4HPQn62u1n8mBDkJREwMsAkCdkwd4Ieqw+x3TUyTsqY0YiBCtE6H6OzzgGk3iuZ3vFWRS+E8/d1g==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "sunos"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-win32-arm64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-win32-arm64/-/typescript-win32-arm64-7.0.2.tgz",
      "integrity": "sha512-Gyl1Vy6OsWesLzmq+EP0Fb7b4Nid5232AvcA2SFcdYreldpNtYFFofPjnt62y9hQy7VTaZp65ICJjuAQRaVcIQ==",
      "cpu": [
        "arm64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "win32"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/@typescript/typescript-win32-x64": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/@typescript/typescript-win32-x64/-/typescript-win32-x64-7.0.2.tgz",
      "integrity": "sha512-0BQ3HkAHHlKLSp1qRvf3SUhGpGsDuhB/jgFw75guyqbxJqEaS0Cw/VFO8i2nHglJUzQCRtMMR/IBAKE3ETMC4g==",
      "cpu": [
        "x64"
      ],
      "license": "Apache-2.0",
      "optional": true,
      "os": [
        "win32"
      ],
      "engines": {
        "node": ">=16.20.0"
      }
    },
    "node_modules/typescript": {
      "version": "7.0.2",
      "resolved": "https://registry.npmjs.org/typescript/-/typescript-7.0.2.tgz",
      "integrity": "sha512-8FYau96o3NKOhbjKi/qNvG/W5jhzxkbdm5sj9AbZ/5T5sWqn3hJgLfGx27sRKZWTvyzCP8dLRBTf5tBTSRVUNA==",
      "license": "Apache-2.0",
      "bin": {
        "tsc": "bin/tsc"
      },
      "engines": {
        "node": ">=16.20.0"
      },
      "optionalDependencies": {
        "@typescript/typescript-aix-ppc64": "7.0.2",
        "@typescript/typescript-darwin-arm64": "7.0.2",
        "@typescript/typescript-darwin-x64": "7.0.2",
        "@typescript/typescript-freebsd-arm64": "7.0.2",
        "@typescript/typescript-freebsd-x64": "7.0.2",
        "@typescript/typescript-linux-arm": "7.0.2",
        "@typescript/typescript-linux-arm64": "7.0.2",
        "@typescript/typescript-linux-loong64": "7.0.2",
        "@typescript/typescript-linux-mips64el": "7.0.2",
        "@typescript/typescript-linux-ppc64": "7.0.2",
        "@typescript/typescript-linux-riscv64": "7.0.2",
        "@typescript/typescript-linux-s390x": "7.0.2",
        "@typescript/typescript-linux-x64": "7.0.2",
        "@typescript/typescript-netbsd-arm64": "7.0.2",
        "@typescript/typescript-netbsd-x64": "7.0.2",
        "@typescript/typescript-openbsd-arm64": "7.0.2",
        "@typescript/typescript-openbsd-x64": "7.0.2",
        "@typescript/typescript-sunos-x64": "7.0.2",
        "@typescript/typescript-win32-arm64": "7.0.2",
        "@typescript/typescript-win32-x64": "7.0.2"
      }
    }
  }
}
package.json
{
  "name": "sample-typescript-is-identifier",
  "version": "1.0.0",
  "description": "Construct and validate TypeScript AST identifier nodes using isIdentifier",
  "type": "module",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "typescript": "7.0.2"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify typescript.isIdentifier in pkg:npm/typescript@7.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/typescript@7.0.2"
  ],
  "symbols": [
    "typescript.isIdentifier"
  ]
}
src/index.mjs
import {
  createIdentifier,
  createStringLiteral,
  createNumericLiteral
} from 'typescript/unstable/ast/factory';

import {
  isIdentifier,
  SyntaxKind
} from 'typescript/unstable/ast';

/**
 * Validates that an AST node is a TypeScript Identifier node and returns its text.
 *
 * @param {object} node - AST node to check.
 * @returns {string} The text content of the identifier.
 * @throws {TypeError} If node is missing or not an Identifier AST node.
 */
export function validateIdentifier(node) {
  if (!node || typeof node !== 'object') {
    throw new TypeError('Expected an AST node object');
  }
  if (!isIdentifier(node)) {
    throw new TypeError('Expected a TypeScript Identifier AST node');
  }
  return node.text;
}

/**
 * Creates a validated TypeScript Identifier AST node with the given name.
 *
 * @param {string} name - Identifier name.
 * @returns {object} The created Identifier AST node.
 * @throws {TypeError} If name is not a non-empty string.
 */
export function createSafeIdentifier(name) {
  if (typeof name !== 'string' || name.trim().length === 0) {
    throw new TypeError('Identifier name must be a non-empty string');
  }
  const idNode = createIdentifier(name);
  if (!isIdentifier(idNode)) {
    throw new Error('Failed to construct a valid Identifier AST node');
  }
  return idNode;
}

/**
 * Filters an array of AST nodes and returns only those that are valid Identifier nodes.
 *
 * @param {object[]} nodes - Array of candidate AST nodes.
 * @returns {object[]} Array of validated Identifier AST nodes.
 */
export function filterIdentifiers(nodes) {
  if (!Array.isArray(nodes)) {
    return [];
  }
  return nodes.filter(node => node && typeof node === 'object' && isIdentifier(node));
}

/**
 * Checks whether a value is a valid TypeScript AST Identifier node without throwing.
 *
 * @param {unknown} node - Candidate value to test.
 * @returns {boolean} True if value is an Identifier AST node, false otherwise.
 */
export function isIdentifierNode(node) {
  if (!node || typeof node !== 'object') {
    return false;
  }
  return isIdentifier(node);
}

export {
  isIdentifier,
  createIdentifier,
  createStringLiteral,
  createNumericLiteral,
  SyntaxKind
};
test/contract.mjs
import assert from 'node:assert/strict';
import {
  createIdentifier,
  createStringLiteral,
  createNumericLiteral,
  createExpressionWithTypeArguments
} from 'typescript/unstable/ast/factory';

import {
  isIdentifier,
  validateIdentifier,
  createSafeIdentifier,
  filterIdentifiers,
  isIdentifierNode,
  SyntaxKind
} from '../src/index.mjs';

// Contract 1: isIdentifier returns true for AST Identifier nodes constructed with createIdentifier
{
  const idNode = createIdentifier('userName');
  assert.strictEqual(isIdentifier(idNode), true, 'createIdentifier output must satisfy isIdentifier');
  assert.strictEqual(idNode.kind, SyntaxKind.Identifier, 'kind must match SyntaxKind.Identifier');
  assert.strictEqual(idNode.text, 'userName', 'text property should match identifier name');
  assert.strictEqual(isIdentifierNode(idNode), true, 'isIdentifierNode helper should return true');
}

// Contract 2: isIdentifier returns false for other AST node types such as string and numeric literals
{
  const strLiteral = createStringLiteral('userName');
  assert.strictEqual(isIdentifier(strLiteral), false, 'StringLiteral must not satisfy isIdentifier');
  assert.notStrictEqual(strLiteral.kind, SyntaxKind.Identifier, 'StringLiteral kind must not be SyntaxKind.Identifier');

  const numLiteral = createNumericLiteral('123');
  assert.strictEqual(isIdentifier(numLiteral), false, 'NumericLiteral must not satisfy isIdentifier');

  const typeExpr = createExpressionWithTypeArguments(createIdentifier('MyType'), []);
  assert.strictEqual(isIdentifier(typeExpr), false, 'ExpressionWithTypeArguments must not satisfy isIdentifier');
}

// Contract 3: isIdentifier throws TypeError when evaluated on null or undefined
{
  assert.throws(
    () => isIdentifier(null),
    {
      name: 'TypeError'
    },
    'isIdentifier on null should throw TypeError'
  );

  assert.throws(
    () => isIdentifier(undefined),
    {
      name: 'TypeError'
    },
    'isIdentifier on undefined should throw TypeError'
  );

  assert.strictEqual(isIdentifierNode(null), false, 'Safe wrapper isIdentifierNode should return false for null');
  assert.strictEqual(isIdentifierNode(undefined), false, 'Safe wrapper isIdentifierNode should return false for undefined');
  assert.strictEqual(isIdentifierNode({}), false, 'Safe wrapper isIdentifierNode should return false for empty object');
}

// Contract 4: filterIdentifiers filters mixed AST node collections to only valid Identifier nodes
{
  const id1 = createIdentifier('alpha');
  const id2 = createIdentifier('beta');
  const str = createStringLiteral('gamma');
  const num = createNumericLiteral('42');
  const nonNode = { type: 'custom' };

  const mixedList = [id1, str, null, id2, num, undefined, nonNode];
  const filtered = filterIdentifiers(mixedList);

  assert.strictEqual(filtered.length, 2, 'Filtered array should contain exactly 2 identifiers');
  assert.strictEqual(filtered[0], id1, 'First filtered item should be id1');
  assert.strictEqual(filtered[1], id2, 'Second filtered item should be id2');
  assert.deepStrictEqual(filterIdentifiers(null), [], 'Null input should return empty array');
  assert.deepStrictEqual(filterIdentifiers(undefined), [], 'Undefined input should return empty array');
}

// Contract 5: validateIdentifier returns identifier text for valid identifiers and throws TypeError for invalid nodes
{
  const id = createSafeIdentifier('validVarName');
  assert.strictEqual(isIdentifier(id), true, 'createSafeIdentifier result must satisfy isIdentifier');
  assert.strictEqual(validateIdentifier(id), 'validVarName', 'validateIdentifier should return identifier text');

  const str = createStringLiteral('notAnId');
  assert.throws(
    () => validateIdentifier(str),
    {
      name: 'TypeError',
      message: 'Expected a TypeScript Identifier AST node'
    }
  );

  assert.throws(
    () => validateIdentifier(null),
    {
      name: 'TypeError',
      message: 'Expected an AST node object'
    }
  );

  assert.throws(
    () => createSafeIdentifier(''),
    {
      name: 'TypeError',
      message: 'Identifier name must be a non-empty string'
    }
  );
}

console.log('Contract test passed successfully.');

Origin Seeder

anonymous