@babel/plugin-syntax-numeric-separator 7.10.4: parse numeric separator syntax with babel plugin

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 numeric separator syntax with babel plugin
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-numeric-separator@7.10.4

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.

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{
  "name": "sample-babel-plugin-syntax-numeric-separator",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-syntax-numeric-separator": "7.10.4"
  }
}

{
  "schemaVersion": 1,
  "goal": "parse numeric separator syntax with babel plugin",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-numeric-separator@7.10.4"
  ]
}

import numericSeparatorPluginModule from "@babel/plugin-syntax-numeric-separator";

export const numericSeparatorPlugin =
  typeof numericSeparatorPluginModule === "function"
    ? numericSeparatorPluginModule
    : numericSeparatorPluginModule.default || numericSeparatorPluginModule;

export function instantiatePlugin(api = {}, options = {}) {
  const normalizedApi = {
    assertVersion: (range) => {
      if (typeof api.assertVersion === "function") {
        api.assertVersion(range);
      }
    },
    ...api
  };
  return numericSeparatorPlugin(normalizedApi, options);
}

export function enableNumericSeparator(parserOpts = {}) {
  const plugins = parserOpts.plugins || [];
  const normalizedParserOpts = { ...parserOpts, plugins: [...plugins] };
  const pluginInstance = instantiatePlugin();
  if (typeof pluginInstance.manipulateOptions === "function") {
    pluginInstance.manipulateOptions({}, normalizedParserOpts);
  }
  return normalizedParserOpts;
}

import assert from "node:assert/strict";
import numericSeparatorPluginModule from "@babel/plugin-syntax-numeric-separator";
import {
  numericSeparatorPlugin,
  instantiatePlugin,
  enableNumericSeparator
} from "../src/index.mjs";

const rawPlugin =
  typeof numericSeparatorPluginModule === "function"
    ? numericSeparatorPluginModule
    : numericSeparatorPluginModule.default || numericSeparatorPluginModule;

// Contract 1: Plugin default export is a function factory asserting Babel 7 compatibility
{
  assert.equal(typeof numericSeparatorPlugin, "function");
  assert.equal(typeof rawPlugin, "function");

  let assertedVersion = null;
  const api = {
    assertVersion: (v) => {
      assertedVersion = v;
    }
  };
  const pluginInstance = rawPlugin(api, {});
  assert.equal(assertedVersion, 7);
  assert.ok(pluginInstance);
}

// Contract 2: Plugin factory returns an object named syntax-numeric-separator with a manipulateOptions hook
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  assert.equal(pluginInstance.name, "syntax-numeric-separator");
  assert.equal(typeof pluginInstance.manipulateOptions, "function");
}

// Contract 3: manipulateOptions pushes numericSeparator into parser options plugins array
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  const parserOpts = { plugins: [] };
  pluginInstance.manipulateOptions({}, parserOpts);
  assert.deepEqual(parserOpts.plugins, ["numericSeparator"]);
}

// Contract 4: manipulateOptions appends numericSeparator to existing plugins list without removing other plugins
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  const parserOpts = { plugins: ["jsx", "typescript"] };
  pluginInstance.manipulateOptions({}, parserOpts);
  assert.deepEqual(parserOpts.plugins, ["jsx", "typescript", "numericSeparator"]);
}

// Contract 5: Module helper enableNumericSeparator returns updated parser options while preserving input immutability
{
  const initialOpts = { plugins: ["asyncGenerators"] };
  const updatedOpts = enableNumericSeparator(initialOpts);
  assert.deepEqual(updatedOpts.plugins, ["asyncGenerators", "numericSeparator"]);
  assert.deepEqual(initialOpts.plugins, ["asyncGenerators"]);

  const emptyOptsResult = enableNumericSeparator();
  assert.deepEqual(emptyOptsResult.plugins, ["numericSeparator"]);
}

console.log("All @babel/plugin-syntax-numeric-separator contract tests passed successfully.");