@babel/plugin-syntax-typescript 7.29.7: default

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-syntax-typescript.default in pkg:npm/%40babel/plugin-syntax-typescript@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-syntax-typescript@7.29.7
Demonstrate these symbols/APIs:
  - @babel/plugin-syntax-typescript.default

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

{
  "schemaVersion": 1,
  "goal": "verify @babel/plugin-syntax-typescript.default in pkg:npm/%40babel/plugin-syntax-typescript@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-syntax-typescript@7.29.7"
  ],
  "symbols": [
    "@babel/plugin-syntax-typescript.default"
  ]
}

import syntaxTypeScriptModule from "@babel/plugin-syntax-typescript";

export const syntaxTypeScriptPlugin =
  typeof syntaxTypeScriptModule === "function"
    ? syntaxTypeScriptModule
    : syntaxTypeScriptModule.default || syntaxTypeScriptModule;

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

export function configureParserOptions(pluginInstance, parserOpts = { plugins: [] }, opts = {}) {
  if (!pluginInstance || typeof pluginInstance.manipulateOptions !== "function") {
    throw new Error("Invalid plugin instance: missing manipulateOptions");
  }
  pluginInstance.manipulateOptions(opts, parserOpts);
  return parserOpts;
}

export function applyTypeScriptSyntax(options = {}, initialPlugins = []) {
  let assertedVersion = null;
  const api = {
    assertVersion: (versionRange) => {
      assertedVersion = versionRange;
    }
  };

  const instance = instantiatePlugin(api, options);
  const parserOpts = { plugins: [...initialPlugins] };
  configureParserOptions(instance, parserOpts, options);
  return { instance, parserOpts, assertedVersion };
}

import assert from "node:assert/strict";
import syntaxTypeScriptModule from "@babel/plugin-syntax-typescript";
import {
  syntaxTypeScriptPlugin,
  instantiatePlugin,
  configureParserOptions,
  applyTypeScriptSyntax
} from "../src/index.mjs";

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

// Contract 1: Plugin default export is a function factory asserting Babel 7 or 8 compatibility
{
  assert.equal(typeof syntaxTypeScriptPlugin, "function");
  assert.equal(typeof rawPlugin, "function");

  let assertedVersion = null;
  const api = {
    assertVersion: (v) => {
      assertedVersion = v;
    }
  };
  const pluginInstance = rawPlugin(api, {});
  assert.equal(assertedVersion, "^7.0.0-0 || ^8.0.0-0");
  assert.ok(pluginInstance);
}

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

// Contract 3: manipulateOptions removes flow and jsx plugins and enables objectRestSpread and classProperties
{
  const pluginInstance = instantiatePlugin({ assertVersion: () => {} }, {});
  const parserOpts = { plugins: ["flow", "jsx", "otherPlugin"] };
  configureParserOptions(pluginInstance, parserOpts, {});

  assert.ok(!parserOpts.plugins.includes("flow"), "flow plugin should be removed");
  assert.ok(!parserOpts.plugins.includes("jsx"), "jsx plugin should be removed");
  assert.ok(parserOpts.plugins.includes("objectRestSpread"), "objectRestSpread should be added");
  assert.ok(parserOpts.plugins.includes("classProperties"), "classProperties should be added");
  assert.ok(parserOpts.plugins.includes("otherPlugin"), "otherPlugin should remain");
}

// Contract 4: manipulateOptions enables jsx plugin when isTSX option is true
{
  const pluginInstance = instantiatePlugin({ assertVersion: () => {} }, { isTSX: true });
  const parserOpts = { plugins: ["jsx"] };
  configureParserOptions(pluginInstance, parserOpts, { isTSX: true });

  assert.ok(parserOpts.plugins.includes("jsx"), "jsx plugin should be re-added when isTSX is true");
}

// Contract 5: manipulateOptions does not enable jsx plugin when isTSX option is false or omitted
{
  // When isTSX is false
  {
    const pluginInstance = instantiatePlugin({ assertVersion: () => {} }, { isTSX: false });
    const parserOpts = { plugins: ["jsx"] };
    configureParserOptions(pluginInstance, parserOpts, { isTSX: false });
    assert.ok(!parserOpts.plugins.includes("jsx"), "jsx plugin should not be added when isTSX is false");
  }

  // When isTSX is omitted
  {
    const pluginInstance = instantiatePlugin({ assertVersion: () => {} }, {});
    const parserOpts = { plugins: ["jsx"] };
    configureParserOptions(pluginInstance, parserOpts, {});
    assert.ok(!parserOpts.plugins.includes("jsx"), "jsx plugin should not be added when isTSX is omitted");
  }
}

// Contract 6: manipulateOptions appends typescript plugin configuration with disallowAmbiguousJSXLike and dts options
{
  const pluginInstance = instantiatePlugin({ assertVersion: () => {} }, {
    disallowAmbiguousJSXLike: true,
    dts: true
  });
  const parserOpts = { plugins: [] };
  configureParserOptions(pluginInstance, parserOpts, {
    disallowAmbiguousJSXLike: true,
    dts: true
  });

  const tsPluginEntry = parserOpts.plugins.find(
    (p) => Array.isArray(p) && p[0] === "typescript"
  );
  assert.ok(tsPluginEntry, "typescript plugin entry must exist in parserOpts.plugins");
  assert.deepEqual(tsPluginEntry[1], {
    disallowAmbiguousJSXLike: true,
    dts: true
  });
}

// Contract 7: Module helper applyTypeScriptSyntax successfully executes plugin lifecycle and configures parser options
{
  const { instance, parserOpts, assertedVersion } = applyTypeScriptSyntax(
    { isTSX: true, dts: false },
    ["flow"]
  );

  assert.equal(assertedVersion, "^7.0.0-0 || ^8.0.0-0");
  assert.equal(instance.name, "syntax-typescript");
  assert.ok(!parserOpts.plugins.includes("flow"));
  assert.ok(parserOpts.plugins.includes("jsx"));
  assert.ok(parserOpts.plugins.includes("objectRestSpread"));
  assert.ok(parserOpts.plugins.includes("classProperties"));

  const tsPluginEntry = parserOpts.plugins.find(
    (p) => Array.isArray(p) && p[0] === "typescript"
  );
  assert.deepEqual(tsPluginEntry, ["typescript", { disallowAmbiguousJSXLike: undefined, dts: false }]);
}

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