CodeSampleX

Sample

@babel/plugin-syntax-class-static-block 7.14.5: verify class static block syntax parsing in babel

Verified sample for npm @babel/plugin-syntax-class-static-block 7.14.5: verify class static block syntax parsing in babel. The contract ran on node 22 …

sha256:079aced7042e9a731393de47b43a639ff8282952f1f816305c0b783c47b9b292

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
verify class static block syntax parsing in babel
Packages
Symbols
  • @babel/plugin-syntax-class-static-block
Created
2026-08-26T14:14:34Z

Contract

  1. plugin exports a default plugin factory asserting Babel 7 compatibility
  2. plugin factory returns plugin descriptor with name syntax-class-static-block
  3. manipulateOptions appends classStaticBlock to parser plugins list
  4. manipulateOptions preserves existing parser plugins when adding classStaticBlock
  5. configureParserOptions helper creates plugin instance and updates parserOpts
  6. hasStaticBlockSyntax accurately checks presence of classStaticBlock 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 class static block syntax parsing in babel
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-class-static-block@7.14.5
Demonstrate these symbols/APIs:
  - @babel/plugin-syntax-class-static-block

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.json
{
  "name": "sample-babel-plugin-syntax-class-static-block",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-syntax-class-static-block": "7.14.5"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify class static block syntax parsing in babel",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-class-static-block@7.14.5"
  ],
  "symbols": [
    "@babel/plugin-syntax-class-static-block"
  ]
}
src/index.mjs
import rawPlugin from "@babel/plugin-syntax-class-static-block";

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

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

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;
}

export function configureParserOptions(parserOpts = {}, options = {}, api = {}) {
  const instance = createPluginInstance(api, options);
  return applySyntaxPlugin(instance, parserOpts);
}

export function hasStaticBlockSyntax(parserOpts = {}) {
  return Array.isArray(parserOpts.plugins) && parserOpts.plugins.includes("classStaticBlock");
}
test/contract.mjs
import assert from "node:assert/strict";
import rawPluginModule from "@babel/plugin-syntax-class-static-block";
import {
  pluginSyntaxClassStaticBlock,
  createPluginInstance,
  applySyntaxPlugin,
  configureParserOptions,
  hasStaticBlockSyntax
} from "../src/index.mjs";

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

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

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

  const failingApi = {
    assertVersion: (v) => {
      if (v !== 7) throw new Error(`Unsupported version: ${v}`);
      throw new Error("Simulated version mismatch");
    }
  };
  assert.throws(() => rawPlugin(failingApi, {}), /Simulated version mismatch/);
}

// Contract 2: plugin factory returns plugin descriptor with name syntax-class-static-block
{
  const api = {
    assertVersion: () => {}
  };
  const instance = createPluginInstance(api, {});
  assert.equal(typeof instance, "object");
  assert.equal(instance.name, "syntax-class-static-block");
  assert.equal(typeof instance.manipulateOptions, "function");
}

// Contract 3: manipulateOptions appends classStaticBlock to parser plugins list
{
  const instance = createPluginInstance({ assertVersion: () => {} });
  const parserOpts = { plugins: ["typescript"] };

  applySyntaxPlugin(instance, parserOpts);

  assert.deepEqual(parserOpts.plugins, ["typescript", "classStaticBlock"]);
}

// Contract 4: manipulateOptions preserves existing parser plugins when adding classStaticBlock
{
  const instance = createPluginInstance({ assertVersion: () => {} });
  const initialPlugins = ["jsx", "decorators-legacy", "asyncGenerators"];
  const parserOpts = { plugins: [...initialPlugins] };

  applySyntaxPlugin(instance, parserOpts);

  assert.equal(parserOpts.plugins.length, 4);
  assert.deepEqual(parserOpts.plugins.slice(0, 3), initialPlugins);
  assert.equal(parserOpts.plugins[3], "classStaticBlock");
}

// Contract 5: configureParserOptions helper creates plugin instance and updates parserOpts
{
  const emptyParserOpts = {};
  const result = configureParserOptions(emptyParserOpts);

  assert.ok(Array.isArray(result.plugins));
  assert.ok(result.plugins.includes("classStaticBlock"));
  assert.equal(emptyParserOpts, result);
}

// Contract 6: hasStaticBlockSyntax accurately checks presence of classStaticBlock in parser options
{
  assert.equal(hasStaticBlockSyntax({}), false);
  assert.equal(hasStaticBlockSyntax({ plugins: ["jsx", "flow"] }), false);
  assert.equal(hasStaticBlockSyntax({ plugins: ["jsx", "classStaticBlock"] }), true);
}

console.log("All @babel/plugin-syntax-class-static-block contract tests passed successfully.");

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