CodeSampleX

Ejemplo

@babel/core 7.26.0: template

Muestra verificada para npm @babel/core 7.26.0: template. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:47f09ef30d04d1bf98cdeb4074ef0aa1bde50196d2bab004aa7610c7cef03b21

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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…		 2026-09-03

Caso

HOW
Objetivo
verify template in pkg:npm/%40babel/core@7.26.0
Paquetes
Símbolos
  • template
Creado
2026-09-03T11:42:46Z

Contrato

  1. template parses JavaScript code templates into AST statements with placeholder substitution
  2. template.ast directly parses source strings and tagged template literals into AST nodes
  3. template.expression creates an AST builder specialized for expressions
  4. template.statements parses code into an array of Statement AST nodes

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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 template in pkg:npm/%40babel/core@7.26.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.0
Demonstrate these symbols/APIs:
  - template

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:sha256:84fcc01e91577b927106695455e5a4ea17eed752cbe9cad17f84bf0a85161833","contract":["template parses JavaScript code templates into AST statements with placeholder substitution","template.ast directly parses source strings and tagged template literals into AST nodes","template.expression creates an AST builder specialized for expressions","template.statements parses code into an array of Statement AST nodes"],"goal":"verify template in pkg:npm/%40babel/core@7.26.0","kind":"HOW","packages":["pkg:npm/%40babel/core@7.26.0"],"schemaVersion":1,"symbols":["template"]},"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/%40babel/core@7.26.0"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.26.0","symbols":["template"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-babel-core-template",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-core-template",
      "version": "1.0.0",
      "dependencies": {
        "@babel/core": "7.26.0"
      }
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    "node_modules/@ampproject/remapping": {
      "version": "2.3.0",
      "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
      "integrity": "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==",
      "license": "Apache-2.0",
      "dependencies": {
        "@jridgewell/gen-mapping": "^0.3.5",
        "@jridgewell/trace-mapping": "^0.3.24"
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      "engines": {
        "node": ">=6.0.0"
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    "node_modules/@babel/code-frame": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
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package.json
{
  "name": "sample-babel-core-template",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.26.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify template in pkg:npm/%40babel/core@7.26.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.0"
  ],
  "symbols": [
    "template"
  ]
}
src/index.mjs
import { template, types } from '@babel/core';

/**
 * Builds a variable declaration AST node from a template string with identifier and value replacements.
 * @param {string} varName - Identifier name for the variable
 * @param {string|number} value - Value to assign
 * @returns {object} AST node representing the variable declaration
 */
export function buildVariableDeclaration(varName, value) {
  const build = template(`const NAME = VALUE;`);
  const valueNode = typeof value === 'number' ? types.numericLiteral(value) : types.stringLiteral(value);
  return build({
    NAME: types.identifier(varName),
    VALUE: valueNode,
  });
}

/**
 * Parses source code directly into an AST node using template.ast.
 * @param {string} code - JavaScript source code
 * @returns {object} AST node
 */
export function parseAst(code) {
  return template.ast(code);
}

/**
 * Creates an expression AST node from a template with placeholder substitution.
 * @param {string} leftId - Identifier on the left
 * @param {number} rightVal - Number on the right
 * @returns {object} BinaryExpression AST node
 */
export function buildBinaryExpression(leftId, rightVal) {
  const buildExpr = template.expression(`LEFT + RIGHT`);
  return buildExpr({
    LEFT: types.identifier(leftId),
    RIGHT: types.numericLiteral(rightVal),
  });
}

/**
 * Parses multiple statements into an array of Statement AST nodes using template.statements.
 * @param {string} code - Code containing statements
 * @returns {object[]} Array of Statement AST nodes
 */
export function parseStatements(code) {
  const buildStmts = template.statements(code);
  return buildStmts();
}

export { template, types };
test/contract.mjs
import assert from 'node:assert/strict';
import {
  template,
  types,
  buildVariableDeclaration,
  parseAst,
  buildBinaryExpression,
  parseStatements,
} from '../src/index.mjs';

// 1. template parses JavaScript code templates into AST statements with placeholder substitution
{
  const decl = buildVariableDeclaration('answer', 42);
  assert.equal(decl.type, 'VariableDeclaration');
  assert.equal(decl.kind, 'const');
  assert.equal(decl.declarations[0].id.name, 'answer');
  assert.equal(decl.declarations[0].init.value, 42);

  const buildRequire = template(`const IMPORT_NAME = require(SOURCE);`);
  const requireAst = buildRequire({
    IMPORT_NAME: types.identifier('myLib'),
    SOURCE: types.stringLiteral('my-lib'),
  });
  assert.equal(requireAst.type, 'VariableDeclaration');
  assert.equal(requireAst.declarations[0].id.name, 'myLib');
  assert.equal(requireAst.declarations[0].init.arguments[0].value, 'my-lib');
}

// 2. template.ast directly parses source strings and tagged template literals into AST nodes
{
  const astFromString = parseAst(`const x = 10;`);
  assert.equal(astFromString.type, 'VariableDeclaration');
  assert.equal(astFromString.declarations[0].id.name, 'x');
  assert.equal(astFromString.declarations[0].init.value, 10);

  const fnAst = template.ast`function ${types.identifier('greet')}(name) { return "hello " + name; }`;
  assert.equal(fnAst.type, 'FunctionDeclaration');
  assert.equal(fnAst.id.name, 'greet');
  assert.equal(fnAst.params[0].name, 'name');
}

// 3. template.expression creates an AST builder specialized for expressions
{
  const exprAst = buildBinaryExpression('counter', 5);
  assert.equal(exprAst.type, 'BinaryExpression');
  assert.equal(exprAst.operator, '+');
  assert.equal(exprAst.left.name, 'counter');
  assert.equal(exprAst.right.value, 5);

  const directExpr = template.expression(`A * B`)({
    A: types.identifier('x'),
    B: types.identifier('y'),
  });
  assert.equal(directExpr.type, 'BinaryExpression');
  assert.equal(directExpr.operator, '*');
  assert.equal(directExpr.left.name, 'x');
  assert.equal(directExpr.right.name, 'y');
}

// 4. template.statements parses code into an array of Statement AST nodes
{
  const stmts = parseStatements(`const a = 1; let b = 2; return a + b;`);
  assert.equal(Array.isArray(stmts), true);
  assert.equal(stmts.length, 3);
  assert.equal(stmts[0].type, 'VariableDeclaration');
  assert.equal(stmts[0].declarations[0].id.name, 'a');
  assert.equal(stmts[1].type, 'VariableDeclaration');
  assert.equal(stmts[1].declarations[0].id.name, 'b');
  assert.equal(stmts[2].type, 'ReturnStatement');
}

console.log('Contract assertions passed.');

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