CodeSampleX

Ejemplo

@babel/core 7.29.7: template

Muestra verificada para npm @babel/core 7.29.7: template. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:2801dcfb4033c2e5d1b62341fdbbf90486340149a24d938ba7ac4f4771dce1ad

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 alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

Caso

HOW
Objetivo
verify @babel/core.template in pkg:npm/%40babel/core@7.29.7
Paquetes
Símbolos
  • @babel/core.template
Creado
2026-08-23T06:26:43Z

Contrato

  1. babel.template creates template functions that replace uppercase placeholder identifiers with provided AST nodes or identifiers, returning Statement AST nodes by default
  2. babel.template.ast directly parses code strings into AST nodes without requiring template invocation or placeholder substitution
  3. babel.template.expression generates Expression AST nodes from template strings with placeholder substitutions
  4. babel.template.statements parses multi-statement templates into an array of Statement AST nodes
  5. babel.template.program creates a complete Program AST node from template strings
  6. babel.template supports syntacticPlaceholders option for %%placeholder%% style token replacements
  7. babel.template functions throw an error when invalid template strings are parsed

Archivos

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

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 @babel/core.template in pkg:npm/%40babel/core@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
Demonstrate these symbols/APIs:
  - @babel/core.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:sha256:8bae61204feb43103e47c83650cd32e68cddfd7f303c0e5441d950579b5ccf19","contract":["babel.template creates template functions that replace uppercase placeholder identifiers with provided AST nodes or identifiers, returning Statement AST nodes by default","babel.template.ast directly parses code strings into AST nodes without requiring template invocation or placeholder substitution","babel.template.expression generates Expression AST nodes from template strings with placeholder substitutions","babel.template.statements parses multi-statement templates into an array of Statement AST nodes","babel.template.program creates a complete Program AST node from template strings","babel.template supports syntacticPlaceholders option for %%placeholder%% style token replacements","babel.template functions throw an error when invalid template strings are parsed"],"goal":"verify @babel/core.template in pkg:npm/%40babel/core@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"symbols":["@babel/core.template"]},"contractCommand":["node","test/contract.js"],"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@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.7","symbols":["@babel/core.template"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-babel-template",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-template",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
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      }
    },
    "node_modules/@babel/code-frame": {
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      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
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      "license": "MIT",
      "dependencies": {
        "@babel/helper-validator-identifier": "^7.29.7",
        "js-tokens": "^4.0.0",
        "picocolors": "^1.1.1"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/compat-data": {
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package.json
{
  "name": "sample-babel-template",
  "version": "1.0.0",
  "description": "verify @babel/core.template in pkg:npm/%40babel/core@7.29.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@babel/core": "7.29.7"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/core.template in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.template"
  ]
}
src/index.js
const babel = require('@babel/core');

/**
 * Builds a function declaration AST node using babel.template.
 *
 * @param {string} functionName - The identifier name for the function.
 * @param {string} paramName - The identifier name for the parameter.
 * @returns {object} The FunctionDeclaration AST node.
 */
function buildFunction(functionName, paramName) {
  const fnTemplate = babel.template(`
    function FUNCTION_NAME(PARAM) {
      return PARAM * 2;
    }
  `);
  return fnTemplate({
    FUNCTION_NAME: babel.types.identifier(functionName),
    PARAM: babel.types.identifier(paramName)
  });
}

/**
 * Directly parses a source code string into an AST node using babel.template.ast.
 *
 * @param {string} code - The JavaScript source code.
 * @returns {object} The parsed AST node.
 */
function parseAst(code) {
  return babel.template.ast(code);
}

/**
 * Builds an expression AST node using babel.template.expression.
 *
 * @param {string} exprCode - The expression code template.
 * @param {object} [replacements={}] - Placeholder replacement mapping.
 * @returns {object} The Expression AST node.
 */
function buildExpression(exprCode, replacements = {}) {
  const exprTemplate = babel.template.expression(exprCode);
  return exprTemplate(replacements);
}

/**
 * Builds an array of statement AST nodes using babel.template.statements.
 *
 * @param {string} statementsCode - The multi-statement code template.
 * @param {object} [replacements={}] - Placeholder replacement mapping.
 * @returns {Array<object>} Array of Statement AST nodes.
 */
function buildStatements(statementsCode, replacements = {}) {
  const stmtsTemplate = babel.template.statements(statementsCode);
  return stmtsTemplate(replacements);
}

/**
 * Builds a Program AST node using babel.template.program.
 *
 * @param {string} code - The code template.
 * @param {object} [replacements={}] - Placeholder replacement mapping.
 * @returns {object} The Program AST node.
 */
function buildProgram(code, replacements = {}) {
  const programTemplate = babel.template.program(code);
  return programTemplate(replacements);
}

/**
 * Builds an AST node using syntactic placeholders (%%name%%).
 *
 * @param {string} templateCode - The code template using %%name%% syntax.
 * @param {object} replacements - Placeholder replacement mapping.
 * @returns {object} The resulting AST node.
 */
function buildWithSyntacticPlaceholders(templateCode, replacements) {
  const templateFn = babel.template(templateCode, {
    syntacticPlaceholders: true
  });
  return templateFn(replacements);
}

module.exports = {
  buildFunction,
  parseAst,
  buildExpression,
  buildStatements,
  buildProgram,
  buildWithSyntacticPlaceholders
};
test/contract.js
const assert = require('assert');
const babel = require('@babel/core');
const {
  buildFunction,
  parseAst,
  buildExpression,
  buildStatements,
  buildProgram,
  buildWithSyntacticPlaceholders
} = require('../src/index');

// 1. babel.template creates template functions that replace uppercase placeholder identifiers with provided AST nodes or identifiers, returning Statement AST nodes by default
{
  const ast = buildFunction('doubleValue', 'num');
  assert(ast !== null && typeof ast === 'object', 'AST must be an object');
  assert.strictEqual(ast.type, 'FunctionDeclaration', 'Result node must be a FunctionDeclaration');
  assert.strictEqual(ast.id.name, 'doubleValue', 'Function name placeholder must be replaced');
  assert.strictEqual(ast.params.length, 1, 'Function must have 1 parameter');
  assert.strictEqual(ast.params[0].name, 'num', 'Parameter name placeholder must be replaced');
  assert.strictEqual(ast.body.type, 'BlockStatement', 'Function body must be BlockStatement');
}

// 2. babel.template.ast directly parses code strings into AST nodes without requiring template invocation or placeholder substitution
{
  const ast = parseAst('const answer = 42;');
  assert(ast !== null && typeof ast === 'object', 'AST must be an object');
  assert.strictEqual(ast.type, 'VariableDeclaration', 'Directly parsed node must be a VariableDeclaration');
  assert.strictEqual(ast.kind, 'const');
  assert.strictEqual(ast.declarations[0].id.name, 'answer');
  assert.strictEqual(ast.declarations[0].init.value, 42);
}

// 3. babel.template.expression generates Expression AST nodes from template strings with placeholder substitutions
{
  const exprAst = buildExpression('LEFT + RIGHT * 2', {
    LEFT: babel.types.identifier('base'),
    RIGHT: babel.types.numericLiteral(10)
  });
  assert(exprAst !== null && typeof exprAst === 'object', 'Expression AST must be an object');
  assert.strictEqual(exprAst.type, 'BinaryExpression', 'Expression must be a BinaryExpression');
  assert.strictEqual(exprAst.operator, '+');
  assert.strictEqual(exprAst.left.type, 'Identifier');
  assert.strictEqual(exprAst.left.name, 'base');
  assert.strictEqual(exprAst.right.type, 'BinaryExpression');
}

// 4. babel.template.statements parses multi-statement templates into an array of Statement AST nodes
{
  const statements = buildStatements(`
    const first = 1;
    const second = 2;
  `);
  assert(Array.isArray(statements), 'Statements result must be an array');
  assert.strictEqual(statements.length, 2, 'Must produce exactly 2 statements');
  assert.strictEqual(statements[0].type, 'VariableDeclaration');
  assert.strictEqual(statements[0].declarations[0].id.name, 'first');
  assert.strictEqual(statements[1].type, 'VariableDeclaration');
  assert.strictEqual(statements[1].declarations[0].id.name, 'second');
}

// 5. babel.template.program creates a complete Program AST node from template strings
{
  const programAst = buildProgram('const x = VALUE;', {
    VALUE: babel.types.numericLiteral(100)
  });
  assert(programAst !== null && typeof programAst === 'object', 'Program AST must be an object');
  assert.strictEqual(programAst.type, 'Program', 'Result must be a Program AST node');
  assert.strictEqual(programAst.body.length, 1);
  assert.strictEqual(programAst.body[0].type, 'VariableDeclaration');
}

// 6. babel.template supports syntacticPlaceholders option for %%placeholder%% style token replacements
{
  const ast = buildWithSyntacticPlaceholders('const %%varName%% = %%initVal%%;', {
    varName: babel.types.identifier('result'),
    initVal: babel.types.stringLiteral('success')
  });
  assert(ast !== null && typeof ast === 'object', 'AST must be an object');
  assert.strictEqual(ast.type, 'VariableDeclaration');
  assert.strictEqual(ast.declarations[0].id.name, 'result');
  assert.strictEqual(ast.declarations[0].init.type, 'StringLiteral');
  assert.strictEqual(ast.declarations[0].init.value, 'success');
}

// 7. babel.template functions throw an error when invalid template strings are parsed
{
  assert.throws(
    () => {
      babel.template('const = ;')();
    },
    (err) => {
      return err instanceof Error;
    },
    'Invalid template string must throw an Error'
  );
}

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

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