CodeSampleX

Sample

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

Verified sample for npm @babel/plugin-syntax-bigint 7.8.3: parse BigInt literals using @babel/plugin-syntax-bigint. The contract ran on node 22 · linux…

sha256:18f3b383a13b98efe7bd16bd07513429a069699a432902bb3c80746a5fcf30b8

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…		 2026-08-26

Case

HOW
Goal
parse BigInt literals using @babel/plugin-syntax-bigint
Packages
Symbols
  • @babel/plugin-syntax-bigint
Created
2026-08-26T14:20:48Z

Contract

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

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: 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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