@babel/plugin-transform-block-scoping 7.29.7: plugin-transform-block-scoping

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 @babel/plugin-transform-block-scoping in pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7
Demonstrate these symbols/APIs:
  - @babel/plugin-transform-block-scoping
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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-transform-block-scoping",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-transform-block-scoping": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/plugin-transform-block-scoping in pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7"
  ],
  "symbols": [
    "@babel/plugin-transform-block-scoping"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import blockScopingPluginModule from "@babel/plugin-transform-block-scoping";

export const blockScopingPlugin =
  typeof blockScopingPluginModule === "function"
    ? blockScopingPluginModule
    : blockScopingPluginModule.default || blockScopingPluginModule;

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

export function validatePluginOptions(options = {}) {
  const { throwIfClosureRequired, tdz } = options;
  if (throwIfClosureRequired !== undefined && typeof throwIfClosureRequired !== "boolean") {
    throw new TypeError(".throwIfClosureRequired must be a boolean, or undefined");
  }
  if (tdz !== undefined && typeof tdz !== "boolean") {
    throw new TypeError(".tdz must be a boolean, or undefined");
  }
  return true;
}

export function getVisitorMethod(pluginInstance, visitorKey) {
  if (!pluginInstance || !pluginInstance.visitor) {
    throw new Error("Invalid plugin instance: missing visitor property");
  }
  return pluginInstance.visitor[visitorKey];
}

import assert from "node:assert/strict";
import blockScopingPluginModule from "@babel/plugin-transform-block-scoping";
import {
  blockScopingPlugin,
  instantiatePlugin,
  validatePluginOptions,
  getVisitorMethod
} from "../src/index.mjs";

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

// Contract 1: Plugin default export is a function factory asserting Babel 7 compatibility
{
  assert.equal(typeof blockScopingPlugin, "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 transform-block-scoping with AST visitor handlers
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  assert.equal(pluginInstance.name, "transform-block-scoping");
  assert.ok(pluginInstance.visitor);
  assert.equal(typeof pluginInstance.visitor, "object");
}

// Contract 3: Plugin accepts valid boolean configuration options for throwIfClosureRequired and tdz
{
  const api = {
    assertVersion: () => {}
  };
  const instanceDefault = instantiatePlugin(api, {});
  assert.ok(instanceDefault);

  const instanceConfigured = instantiatePlugin(api, {
    throwIfClosureRequired: true,
    tdz: true
  });
  assert.ok(instanceConfigured);

  const instanceDisabled = instantiatePlugin(api, {
    throwIfClosureRequired: false,
    tdz: false
  });
  assert.ok(instanceDisabled);
}

// Contract 4: Plugin throws error when throwIfClosureRequired option is not a boolean
{
  const api = {
    assertVersion: () => {}
  };
  assert.throws(
    () => {
      instantiatePlugin(api, { throwIfClosureRequired: "invalid" });
    },
    {
      name: "Error",
      message: ".throwIfClosureRequired must be a boolean, or undefined"
    }
  );
}

// Contract 5: Plugin throws error when tdz option is not a boolean
{
  const api = {
    assertVersion: () => {}
  };
  assert.throws(
    () => {
      instantiatePlugin(api, { tdz: 123 });
    },
    {
      name: "Error",
      message: ".tdz must be a boolean, or undefined"
    }
  );
}

// Contract 6: Plugin visitor contains handlers for VariableDeclaration, BlockStatement, and Loop constructs
{
  const api = {
    assertVersion: () => {}
  };
  const pluginInstance = instantiatePlugin(api, {});
  const varHandler = getVisitorMethod(pluginInstance, "VariableDeclaration");
  const blockHandler = getVisitorMethod(pluginInstance, "BlockStatement");
  const forHandler = getVisitorMethod(pluginInstance, "ForStatement");

  assert.ok(varHandler, "VariableDeclaration visitor must exist");
  assert.ok(blockHandler, "BlockStatement visitor must exist");
  assert.ok(forHandler, "ForStatement visitor must exist");
}

// Contract 7: Module helper validatePluginOptions validates boolean option flags
{
  assert.equal(validatePluginOptions({}), true);
  assert.equal(validatePluginOptions({ throwIfClosureRequired: true, tdz: false }), true);

  assert.throws(
    () => validatePluginOptions({ throwIfClosureRequired: "true" }),
    { name: "TypeError", message: ".throwIfClosureRequired must be a boolean, or undefined" }
  );

  assert.throws(
    () => validatePluginOptions({ tdz: 1 }),
    { name: "TypeError", message: ".tdz must be a boolean, or undefined" }
  );
}

console.log("All @babel/plugin-transform-block-scoping contract tests passed successfully.");