CodeSampleX

Sample

@babel/plugin-syntax-json-strings 7.8.3

Verified sample for npm @babel/plugin-syntax-json-strings 7.8.3. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:7797f4235f3a9bd8ff212998d52669b7d63ef56f6e46ed8abffd74c352f64462

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…		 2026-08-27

Case

HOW
Goal
verify pkg:npm/@babel/plugin-syntax-json-strings@7.8.3
Packages
Created
2026-08-27T21:29:38Z

Contract

  1. Plugin exports a default plugin factory asserting Babel 7 compatibility
  2. Plugin factory returns descriptor named syntax-json-strings with manipulateOptions method
  3. manipulateOptions pushes jsonStrings into parserOpts plugins array
  4. applySyntaxPlugin initializes plugins array if parserOpts.plugins is undefined
  5. applySyntaxPlugin throws when called with invalid plugin instance
  6. configureParserOptions helper initializes plugin and configures parser options in single step
  7. hasJsonStringsPlugin helper accurately detects jsonStrings in parser options

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: verify pkg:npm/@babel/plugin-syntax-json-strings@7.8.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-json-strings@7.8.3

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
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package-lock.json
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package.json
{
  "name": "sample-babel-plugin-syntax-json-strings",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-syntax-json-strings": "7.8.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/@babel/plugin-syntax-json-strings@7.8.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-json-strings@7.8.3"
  ]
}
src/index.mjs
import rawPluginModule from "@babel/plugin-syntax-json-strings";

export const pluginSyntaxJsonStrings =
  typeof rawPluginModule === "function"
    ? rawPluginModule
    : rawPluginModule.default?.default || rawPluginModule.default || rawPluginModule;

/**
 * Instantiate the @babel/plugin-syntax-json-strings plugin with an optional custom API object.
 */
export function createPluginInstance(api = {}, options = {}) {
  const normalizedApi = {
    assertVersion: (range) => {
      if (typeof api.assertVersion === "function") {
        api.assertVersion(range);
      }
    },
    ...api
  };
  return pluginSyntaxJsonStrings(normalizedApi, options);
}

/**
 * Apply the syntax-json-strings plugin to a parser options object.
 */
export function applySyntaxPlugin(pluginInstance, parserOpts = {}) {
  if (!pluginInstance || typeof pluginInstance.manipulateOptions !== "function") {
    throw new Error("Invalid plugin instance: missing manipulateOptions");
  }
  if (!parserOpts.plugins) {
    parserOpts.plugins = [];
  }
  pluginInstance.manipulateOptions({}, parserOpts);
  return parserOpts;
}

/**
 * Configure parser options with @babel/plugin-syntax-json-strings in a single step.
 */
export function configureParserOptions(parserOpts = {}, options = {}, api = {}) {
  const instance = createPluginInstance(api, options);
  return applySyntaxPlugin(instance, parserOpts);
}

/**
 * Check if the jsonStrings plugin is enabled in parser options.
 */
export function hasJsonStringsPlugin(parserOpts = {}) {
  if (!Array.isArray(parserOpts.plugins)) return false;
  return parserOpts.plugins.includes("jsonStrings");
}
test/contract.mjs
import assert from "node:assert/strict";
import rawPluginModule from "@babel/plugin-syntax-json-strings";
import {
  pluginSyntaxJsonStrings,
  createPluginInstance,
  applySyntaxPlugin,
  configureParserOptions,
  hasJsonStringsPlugin
} from "../src/index.mjs";

// Contract 1: Plugin exports a default plugin factory asserting Babel 7 compatibility
{
  assert.equal(typeof pluginSyntaxJsonStrings, "function");

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

  const failingApi = {
    assertVersion: (v) => {
      throw new Error(`Unsupported Babel version: ${v}`);
    }
  };
  assert.throws(() => pluginSyntaxJsonStrings(failingApi, {}), /Unsupported Babel version: 7/);
}

// Contract 2: Plugin factory returns descriptor named syntax-json-strings with manipulateOptions method
{
  const api = {
    assertVersion: () => {}
  };
  const instance = createPluginInstance(api, {});
  assert.equal(typeof instance, "object");
  assert.equal(instance.name, "syntax-json-strings");
  assert.equal(typeof instance.manipulateOptions, "function");
}

// Contract 3: manipulateOptions pushes jsonStrings into parserOpts plugins array
{
  const instance = createPluginInstance({ assertVersion: () => {} }, {});
  const parserOpts = { plugins: ["jsx"] };

  applySyntaxPlugin(instance, parserOpts);

  assert.ok(parserOpts.plugins.includes("jsx"));
  assert.ok(parserOpts.plugins.includes("jsonStrings"));
  assert.equal(parserOpts.plugins.length, 2);
}

// Contract 4: applySyntaxPlugin initializes plugins array if parserOpts.plugins is undefined
{
  const instance = createPluginInstance({ assertVersion: () => {} }, {});
  const parserOpts = {};

  applySyntaxPlugin(instance, parserOpts);

  assert.ok(Array.isArray(parserOpts.plugins));
  assert.ok(parserOpts.plugins.includes("jsonStrings"));
}

// Contract 5: applySyntaxPlugin throws when called with invalid plugin instance
{
  assert.throws(
    () => applySyntaxPlugin(null, {}),
    /Invalid plugin instance: missing manipulateOptions/
  );
  assert.throws(
    () => applySyntaxPlugin({}, {}),
    /Invalid plugin instance: missing manipulateOptions/
  );
}

// Contract 6: configureParserOptions helper initializes plugin and configures parser options in single step
{
  const parserOpts = { plugins: ["typescript"] };
  const configured = configureParserOptions(
    parserOpts,
    {},
    { assertVersion: () => {} }
  );

  assert.equal(configured, parserOpts);
  assert.ok(configured.plugins.includes("typescript"));
  assert.ok(configured.plugins.includes("jsonStrings"));
}

// Contract 7: hasJsonStringsPlugin helper accurately detects jsonStrings in parser options
{
  assert.equal(hasJsonStringsPlugin({}), false);
  assert.equal(hasJsonStringsPlugin({ plugins: ["jsx"] }), false);
  assert.equal(hasJsonStringsPlugin({ plugins: ["jsonStrings", "jsx"] }), true);
}

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

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