CodeSampleX

Sample

vite-node 3.2.4: extractSourceMap

Verified sample for npm vite-node 3.2.4: extractSourceMap. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:6874cd6da6010c3bab889c60cd7f06c14170142229cef485b2d30c95cd4e98d3

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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…		 2026-09-14

Case

HOW
Goal
verify vite-node.extractSourceMap in pkg:npm/vite-node@3.2.4
Packages
Symbols
  • vite-node.extractSourceMap
Environment
node 22.23.2
Created
2026-09-14T12:42:51Z

Contract

  1. extractSourceMap is exported from vite-node/source-map as a function
  2. extractSourceMap extracts and decodes a base64 inline JSON sourcemap from transformed code generated by withInlineSourcemap
  3. extractSourceMap parses explicit base64 data URIs formatted with charset utf-8 sourceMappingURL comments
  4. extractSourceMap extracts the last inline sourcemap when multiple sourceMappingURL comments are present
  5. extractSourceMap returns null when code contains no inline sourcemap comment
  6. extractSourceMap returns null when passed an empty string or code without data URL sourcemap pattern

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • 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 vite-node.extractSourceMap in pkg:npm/vite-node@3.2.4
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite-node@3.2.4
Demonstrate these symbols/APIs:
  - vite-node.extractSourceMap
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.
csx.json
{"case":{"caseId":"case:sha256:d3b2cfa2aefec315ab5acbc7dcb4b441bae9333b6c803493c7e4ed1dbf2ee091","constraints":{"executionContext":"node"},"contract":["extractSourceMap is exported from vite-node/source-map as a function","extractSourceMap extracts and decodes a base64 inline JSON sourcemap from transformed code generated by withInlineSourcemap","extractSourceMap parses explicit base64 data URIs formatted with charset utf-8 sourceMappingURL comments","extractSourceMap extracts the last inline sourcemap when multiple sourceMappingURL comments are present","extractSourceMap returns null when code contains no inline sourcemap comment","extractSourceMap returns null when passed an empty string or code without data URL sourcemap pattern"],"goal":"verify vite-node.extractSourceMap in pkg:npm/vite-node@3.2.4","kind":"HOW","packages":["pkg:npm/vite-node@3.2.4"],"schemaVersion":1,"symbols":["vite-node.extractSourceMap"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/vite-node@3.2.4"],"schemaVersion":1,"subject":"pkg:npm/vite-node@3.2.4","symbols":["vite-node.extractSourceMap"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-vite-node-extract-sourcemap",
  "version": "1.0.0",
  "description": "Minimal sample verifying vite-node extractSourceMap",
  "main": "src/index.js",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vite-node": "3.2.4"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify vite-node.extractSourceMap in pkg:npm/vite-node@3.2.4",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite-node@3.2.4"
  ],
  "symbols": [
    "vite-node.extractSourceMap"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.js
'use strict';

const { extractSourceMap, withInlineSourcemap } = require('vite-node/source-map');

/**
 * Extracts and decodes an inline source map from source code.
 *
 * @param {string} code - Transformed JavaScript code potentially containing an inline source map.
 * @returns {object|null} Decoded source map object, or null if not present.
 */
function extractMap(code) {
  return extractSourceMap(code);
}

module.exports = {
  extractSourceMap,
  withInlineSourcemap,
  extractMap
};
test/contract.mjs
import assert from 'node:assert/strict';
import { extractSourceMap, withInlineSourcemap, extractMap } from '../src/index.js';
import * as sourceMapModule from 'vite-node/source-map';

// 1. extractSourceMap is exported from vite-node/source-map as a function
assert.equal(typeof sourceMapModule.extractSourceMap, 'function', 'extractSourceMap must be exported from vite-node/source-map');
assert.equal(typeof extractSourceMap, 'function', 'extractSourceMap must be a function');
assert.equal(typeof extractMap, 'function', 'extractMap wrapper must be a function');

// 2. extractSourceMap extracts and decodes a base64 inline JSON sourcemap from transformed code generated by withInlineSourcemap
{
  const originalMap = { version: 3, sources: ['app.ts'], mappings: 'AAAA' };
  const transformed = withInlineSourcemap(
    { code: 'const app = 42;', map: originalMap },
    { root: '/workspace', filepath: '/workspace/app.ts' }
  );
  const result = extractSourceMap(transformed.code);
  assert.deepEqual(result, originalMap);
  assert.deepEqual(extractMap(transformed.code), originalMap);
}

// 3. extractSourceMap parses explicit base64 data URIs formatted with charset utf-8 sourceMappingURL comments
{
  const map = { version: 3, file: 'main.js', sources: ['main.ts'], names: ['foo'], mappings: 'AAAA;AACA' };
  const b64 = Buffer.from(JSON.stringify(map), 'utf-8').toString('base64');
  const code = `console.log("hello");\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,${b64}\n`;
  const result = extractSourceMap(code);
  assert.deepEqual(result, map);
}

// 4. extractSourceMap extracts the last inline sourcemap when multiple sourceMappingURL comments are present
{
  const firstMap = { version: 3, sources: ['first.ts'], mappings: 'AAAA' };
  const secondMap = { version: 3, sources: ['second.ts'], mappings: 'BBBB' };
  const b64First = Buffer.from(JSON.stringify(firstMap), 'utf-8').toString('base64');
  const b64Second = Buffer.from(JSON.stringify(secondMap), 'utf-8').toString('base64');
  const code = `console.log("multi");\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,${b64First}\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,${b64Second}\n`;
  const result = extractSourceMap(code);
  assert.deepEqual(result, secondMap);
}

// 5. extractSourceMap returns null when code contains no inline sourcemap comment
{
  assert.equal(extractSourceMap('const x = 1;\nconst y = 2;\n'), null);
  assert.equal(extractMap('const x = 1;\nconst y = 2;\n'), null);
}

// 6. extractSourceMap returns null when passed an empty string or code without data URL sourcemap pattern
{
  assert.equal(extractSourceMap(''), null);
  assert.equal(extractSourceMap('//# sourceMappingURL=foo.js.map'), null);
  assert.equal(extractSourceMap('//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozfQ=='), null);
}

console.log('All vite-node.extractSourceMap contract tests passed.');

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