@babel/types 7.29.7: numericLiteral

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 @babel/types.numericLiteral in pkg:npm/%40babel/types@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/types@7.29.7
Demonstrate these symbols/APIs:
  - @babel/types.numericLiteral

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.

{"case":{"caseId":"case:sha256:f56447539b5042b499ddb505118ec78e9b6808e33b48d49a92a0dcf8b6af29ae","constraints":{"executionContext":"node"},"contract":["types.numericLiteral creates a NumericLiteral AST node with the specified number value and type 'NumericLiteral'","types.numericLiteral throws a TypeError when called with a non-number argument","types.isNumericLiteral returns true for NumericLiteral nodes with optional value matching and false for other nodes","types.assertNumericLiteral succeeds for valid NumericLiteral nodes and throws an Error for non-NumericLiteral nodes","NumericLiteral nodes created with types.numericLiteral integrate into compound AST structures like BinaryExpression and ArrayExpression","types.cloneNode produces an independent equivalent copy of a NumericLiteral node"],"goal":"verify @babel/types.numericLiteral in pkg:npm/%40babel/types@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/types@7.29.7"],"schemaVersion":1,"symbols":["@babel/types.numericLiteral"]},"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/%40babel/types@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/types@7.29.7","symbols":["@babel/types.numericLiteral"],"verifierAdapter":"node-typescript@1"}

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  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-types-numericliteral",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@babel/types": "7.29.7"
      }
    },
    "node_modules/@babel/helper-string-parser": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.29.7.tgz",
      "integrity": "sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
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    },
    "node_modules/@babel/helper-validator-identifier": {
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      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.29.7.tgz",
      "integrity": "sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg==",
      "license": "MIT",
      "engines": {
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    "node_modules/@babel/types": {
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      "integrity": "sha512-4zBIxpPzowiZpusoFkyGVwakdRJUyuH5PxQ/PrqghfdFWWasvnCdPfQXHrenDai+gyLARulZjZowCOj6fjT4pA==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-string-parser": "^7.29.7",
        "@babel/helper-validator-identifier": "^7.29.7"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    }
  }
}

{
  "name": "sample-babel-types-numericliteral",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @babel/types.numericLiteral",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "@babel/types": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/types.numericLiteral in pkg:npm/%40babel/types@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/types@7.29.7"
  ],
  "symbols": [
    "@babel/types.numericLiteral"
  ]
}

const t = require('@babel/types');

/**
 * Creates a NumericLiteral AST node with the given number value.
 * @param {number} value
 * @returns {object}
 */
function createNumericLiteral(value) {
  return t.numericLiteral(value);
}

/**
 * Checks if a node is a NumericLiteral, optionally matching properties.
 * @param {object} node
 * @param {object} [opts]
 * @returns {boolean}
 */
function isNumericLiteralNode(node, opts) {
  return t.isNumericLiteral(node, opts);
}

/**
 * Asserts that a node is a NumericLiteral, throwing if not.
 * @param {object} node
 * @param {object} [opts]
 */
function assertNumericLiteralNode(node, opts) {
  t.assertNumericLiteral(node, opts);
}

/**
 * Creates a BinaryExpression AST node with two NumericLiteral operands.
 * @param {string} operator
 * @param {number} leftValue
 * @param {number} rightValue
 * @returns {object}
 */
function createBinaryNumericExpression(operator, leftValue, rightValue) {
  const left = t.numericLiteral(leftValue);
  const right = t.numericLiteral(rightValue);
  return t.binaryExpression(operator, left, right);
}

/**
 * Creates an ArrayExpression AST node containing NumericLiteral elements.
 * @param {number[]} values
 * @returns {object}
 */
function createNumericArrayExpression(values) {
  const elements = values.map((val) => t.numericLiteral(val));
  return t.arrayExpression(elements);
}

/**
 * Clones a NumericLiteral AST node.
 * @param {object} node
 * @returns {object}
 */
function cloneNumericLiteral(node) {
  return t.cloneNode(node);
}

module.exports = {
  t,
  createNumericLiteral,
  isNumericLiteralNode,
  assertNumericLiteralNode,
  createBinaryNumericExpression,
  createNumericArrayExpression,
  cloneNumericLiteral,
};

import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  t,
  createNumericLiteral,
  isNumericLiteralNode,
  assertNumericLiteralNode,
  createBinaryNumericExpression,
  createNumericArrayExpression,
  cloneNumericLiteral,
} = require('../src/index.js');

async function runContract() {
  // 1. types.numericLiteral creates a NumericLiteral AST node with the specified number value and type 'NumericLiteral'
  const intNode = createNumericLiteral(42);
  assert.strictEqual(intNode.type, 'NumericLiteral');
  assert.strictEqual(intNode.value, 42);

  const floatNode = createNumericLiteral(3.14159);
  assert.strictEqual(floatNode.type, 'NumericLiteral');
  assert.strictEqual(floatNode.value, 3.14159);

  const zeroNode = t.numericLiteral(0);
  assert.strictEqual(zeroNode.type, 'NumericLiteral');
  assert.strictEqual(zeroNode.value, 0);

  const negNode = t.numericLiteral(-250);
  assert.strictEqual(negNode.type, 'NumericLiteral');
  assert.strictEqual(negNode.value, -250);

  // 2. types.numericLiteral throws a TypeError when called with a non-number argument
  assert.throws(
    () => createNumericLiteral('42'),
    (err) => err instanceof TypeError || err.message.includes('expected type of number'),
    'types.numericLiteral must throw when value is a string'
  );
  assert.throws(
    () => createNumericLiteral(null),
    (err) => err instanceof TypeError || err.message.includes('expected type of number'),
    'types.numericLiteral must throw when value is null'
  );
  assert.throws(
    () => createNumericLiteral(undefined),
    (err) => err instanceof TypeError || err.message.includes('expected type of number'),
    'types.numericLiteral must throw when value is undefined'
  );
  assert.throws(
    () => createNumericLiteral(true),
    (err) => err instanceof TypeError || err.message.includes('expected type of number'),
    'types.numericLiteral must throw when value is boolean'
  );

  // 3. types.isNumericLiteral returns true for NumericLiteral nodes with optional value matching and false for other nodes
  assert.strictEqual(isNumericLiteralNode(intNode), true);
  assert.strictEqual(isNumericLiteralNode(intNode, { value: 42 }), true);
  assert.strictEqual(isNumericLiteralNode(intNode, { value: 100 }), false);

  const identNode = t.identifier('count');
  assert.strictEqual(isNumericLiteralNode(identNode), false);
  assert.strictEqual(isNumericLiteralNode(null), false);
  assert.strictEqual(isNumericLiteralNode(undefined), false);

  // 4. types.assertNumericLiteral succeeds for valid NumericLiteral nodes and throws an Error for non-NumericLiteral nodes
  assertNumericLiteralNode(intNode);
  assertNumericLiteralNode(intNode, { value: 42 });
  assert.throws(
    () => assertNumericLiteralNode(identNode),
    (err) => err instanceof Error,
    'assertNumericLiteral on non-NumericLiteral node must throw'
  );
  assert.throws(
    () => assertNumericLiteralNode(intNode, { value: 999 }),
    (err) => err instanceof Error,
    'assertNumericLiteral with mismatching value option must throw'
  );

  // 5. NumericLiteral nodes created with types.numericLiteral integrate into compound AST structures like BinaryExpression and ArrayExpression
  const binExpr = createBinaryNumericExpression('+', 10, 20);
  assert.strictEqual(binExpr.type, 'BinaryExpression');
  assert.strictEqual(binExpr.operator, '+');
  assert.strictEqual(binExpr.left.type, 'NumericLiteral');
  assert.strictEqual(binExpr.left.value, 10);
  assert.strictEqual(binExpr.right.type, 'NumericLiteral');
  assert.strictEqual(binExpr.right.value, 20);

  const arrExpr = createNumericArrayExpression([1, 2, 3]);
  assert.strictEqual(arrExpr.type, 'ArrayExpression');
  assert.strictEqual(arrExpr.elements.length, 3);
  assert.strictEqual(arrExpr.elements[0].type, 'NumericLiteral');
  assert.strictEqual(arrExpr.elements[0].value, 1);
  assert.strictEqual(arrExpr.elements[1].type, 'NumericLiteral');
  assert.strictEqual(arrExpr.elements[1].value, 2);
  assert.strictEqual(arrExpr.elements[2].type, 'NumericLiteral');
  assert.strictEqual(arrExpr.elements[2].value, 3);

  // 6. types.cloneNode produces an independent equivalent copy of a NumericLiteral node
  const cloned = cloneNumericLiteral(intNode);
  assert.notStrictEqual(cloned, intNode, 'cloned node should have separate object identity');
  assert.strictEqual(cloned.type, 'NumericLiteral');
  assert.strictEqual(cloned.value, 42);
  assert.strictEqual(t.isNodesEquivalent(cloned, intNode), true);

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

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});