Ejemplo

@babel/plugin-syntax-bigint 7.8.3: parse BigInt literals using @babel/plugin-syntax-bigint

Muestra verificada para npm @babel/plugin-syntax-bigint 7.8.3: parse BigInt literals using @babel/plugin-syntax-bigint. El contrato se ejecutó en node 22 …

sha256:18f3b383a13b98efe7bd16bd07513429a069699a432902bb3c80746a5fcf30b8

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…	2026-08-26

Caso

HOW

Objetivo: parse BigInt literals using @babel/plugin-syntax-bigint
Paquetes: @babel/plugin-syntax-bigint 7.8.3
Símbolos: @babel/plugin-syntax-bigint
Creado: 2026-08-26T14:20:48Z

Contrato

pluginSyntaxBigInt exports a declare plugin function registering syntax-bigint
parses BigInt literals into BigIntLiteral AST nodes with value and raw representation
parses BigInt literals in binary expressions and variable declarations without syntax errors
parses BigInt literals in function return statements and array expressions

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: parse BigInt literals using @babel/plugin-syntax-bigint
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-bigint@7.8.3
Demonstrate these symbols/APIs:
  - @babel/plugin-syntax-bigint

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:afc30327c5edbc4dad62bf33799f5c3fa046498b376086010e2aa68c93db218c","contract":["pluginSyntaxBigInt exports a declare plugin function registering syntax-bigint","parses BigInt literals into BigIntLiteral AST nodes with value and raw representation","parses BigInt literals in binary expressions and variable declarations without syntax errors","parses BigInt literals in function return statements and array expressions"],"goal":"parse BigInt literals using @babel/plugin-syntax-bigint","kind":"HOW","packages":["pkg:npm/%40babel/plugin-syntax-bigint@7.8.3"],"schemaVersion":1,"symbols":["@babel/plugin-syntax-bigint"]},"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/plugin-syntax-bigint@7.8.3"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-syntax-bigint@7.8.3","symbols":["@babel/plugin-syntax-bigint"],"verifierAdapter":"node-typescript@1"}

package-lock.json

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package.json

{
  "name": "sample-syntax-bigint",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "@babel/core": "^7.26.0",
    "@babel/plugin-syntax-bigint": "7.8.3"
  }
}

spec.json

{
  "schemaVersion": 1,
  "goal": "parse BigInt literals using @babel/plugin-syntax-bigint",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-bigint@7.8.3"
  ],
  "symbols": [
    "@babel/plugin-syntax-bigint"
  ]
}

src/index.mjs

import { parseSync, transformSync } from "@babel/core";
import _pluginSyntaxBigInt from "@babel/plugin-syntax-bigint";

const pluginSyntaxBigInt = _pluginSyntaxBigInt?.default ?? _pluginSyntaxBigInt;

/**
 * Parses JavaScript code containing BigInt literals into an AST.
 * @param {string} code - Source JavaScript code.
 * @returns {object} - Babel AST program node.
 */
export function parseWithBigInt(code) {
  const result = parseSync(code, {
    plugins: [pluginSyntaxBigInt],
    configFile: false,
    babelrc: false,
  });
  return result?.program ?? null;
}

/**
 * Transforms JavaScript code using @babel/plugin-syntax-bigint.
 * @param {string} code - Source JavaScript code.
 * @param {object} [options] - Plugin configuration options.
 * @returns {string} - Transformed code string.
 */
export function transformWithBigInt(code, options = {}) {
  const result = transformSync(code, {
    plugins: [[pluginSyntaxBigInt, options]],
    configFile: false,
    babelrc: false,
  });
  return result?.code ?? "";
}

export { pluginSyntaxBigInt };

test/contract.mjs

import assert from "node:assert/strict";
import { parseWithBigInt, transformWithBigInt, pluginSyntaxBigInt } from "../src/index.mjs";

// Assertion 1: Plugin export verification
assert.equal(typeof pluginSyntaxBigInt, "function", "pluginSyntaxBigInt must be a function");

// Assertion 2: Parses BigInt literals into BigIntLiteral AST nodes
{
  const code = "const largeNumber = 9007199254740991n;";
  const program = parseWithBigInt(code);
  assert.ok(program, "AST program should be generated");
  assert.equal(program.body.length, 1, "Program should have 1 statement");

  const declaration = program.body[0];
  assert.equal(declaration.type, "VariableDeclaration", "Statement should be VariableDeclaration");
  const init = declaration.declarations[0].init;
  assert.equal(init.type, "BigIntLiteral", "Literal should be identified as BigIntLiteral");
  assert.equal(init.value, "9007199254740991", "BigInt literal value should match numeric string");
  assert.equal(init.extra?.raw, "9007199254740991n", "BigInt literal extra.raw should preserve source text");
}

// Assertion 3: Enables parsing of BigInt literals in expressions and returns valid code
{
  const code = "const result = 100n + 200n;";
  const transformed = transformWithBigInt(code);
  assert.ok(transformed.includes("100n + 200n"), "Transformed code should preserve BigInt expressions");

  const program = parseWithBigInt(code);
  const binaryExpr = program.body[0].declarations[0].init;
  assert.equal(binaryExpr.type, "BinaryExpression", "Expression should be BinaryExpression");
  assert.equal(binaryExpr.left.type, "BigIntLiteral", "Left operand should be BigIntLiteral");
  assert.equal(binaryExpr.right.type, "BigIntLiteral", "Right operand should be BigIntLiteral");
  assert.equal(binaryExpr.left.value, "100", "Left value should be 100");
  assert.equal(binaryExpr.right.value, "200", "Right value should be 200");
}

// Assertion 4: BigInt in function return and array literals
{
  const code = "function getBig() { return [1n, 2n, 3n]; }";
  const program = parseWithBigInt(code);
  const fnDecl = program.body[0];
  assert.equal(fnDecl.type, "FunctionDeclaration", "Statement should be FunctionDeclaration");
  const returnStmt = fnDecl.body.body[0];
  assert.equal(returnStmt.type, "ReturnStatement", "Function body should have ReturnStatement");
  const arrayExpr = returnStmt.argument;
  assert.equal(arrayExpr.type, "ArrayExpression", "Return argument should be ArrayExpression");
  assert.equal(arrayExpr.elements.length, 3, "Array should have 3 elements");
  assert.equal(arrayExpr.elements[0].type, "BigIntLiteral");
  assert.equal(arrayExpr.elements[0].value, "1");
}

console.log("All contract tests passed successfully.");

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