CodeSampleX

Sample

@babel/plugin-syntax-typescript 7.29.7: default

Verified sample for npm @babel/plugin-syntax-typescript 7.29.7: default. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:b28a543d2f16094a885b157803fe2a0e71e8aeb2559c03064daacb576df8816d

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 debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Case

HOW
Goal
verify @babel/plugin-syntax-typescript.default in pkg:npm/%40babel/plugin-syntax-typescript@7.29.7
Packages
Symbols
  • @babel/plugin-syntax-typescript.default
Created
2026-09-05T22:04:29Z

Contract

  1. Plugin default export is a function factory asserting Babel 7 or 8 compatibility
  2. Plugin factory returns an object named syntax-typescript with a manipulateOptions function
  3. manipulateOptions removes flow and jsx plugins and enables objectRestSpread and classProperties
  4. manipulateOptions enables jsx plugin when isTSX option is true
  5. manipulateOptions does not enable jsx plugin when isTSX option is false or omitted
  6. manipulateOptions appends typescript plugin configuration with disallowAmbiguousJSXLike and dts options
  7. Module helper applyTypeScriptSyntax successfully executes plugin lifecycle and configures 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 @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.
csx.json
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package-lock.json
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package.json
{
  "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"
  }
}
spec.json
{
  "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"
  ]
}
src/index.mjs
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 };
}
test/contract.mjs
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.");

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