vite-node 2.1.9: withInlineSourcemap

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.withInlineSourcemap in pkg:npm/vite-node@2.1.9
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vite-node@2.1.9
Demonstrate these symbols/APIs:
  - vite-node.withInlineSourcemap

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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        "debug": "^4.3.7",
        "es-module-lexer": "^1.5.4",
        "pathe": "^1.1.2",
        "vite": "^5.0.0"
      },
      "bin": {
        "vite-node": "vite-node.mjs"
      },
      "engines": {
        "node": "^18.0.0 || >=20.0.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    }
  }
}

{
  "name": "vite-node-with-inline-sourcemap-sample",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification for vite-node withInlineSourcemap",
  "dependencies": {
    "vite-node": "2.1.9"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify vite-node.withInlineSourcemap in pkg:npm/vite-node@2.1.9",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vite-node@2.1.9"
  ],
  "symbols": [
    "vite-node.withInlineSourcemap"
  ]
}

import assert from 'node:assert/strict';
import { withInlineSourcemap, extractSourceMap } from 'vite-node/source-map';

// 1. withInlineSourcemap is exported as a function by vite-node/source-map
assert.strictEqual(typeof withInlineSourcemap, 'function');
assert.strictEqual(typeof extractSourceMap, 'function');

// 2. withInlineSourcemap appends inline base64 sourcemap comment and marker to transformed code
{
  const original = {
    code: 'const greeting = "hello";\nconsole.log(greeting);',
    map: {
      version: 3,
      sources: ['greeting.js'],
      names: [],
      mappings: 'AAAA,MAAM,QAAQ,GAAG,OAAO,CAAC;AACzB,OAAO,CAAC,GAAG,CAAC,QAAQ,CAAC,CAAC',
      file: 'greeting.js',
    },
  };
  const options = {
    root: '/workspace',
    filepath: '/workspace/greeting.js',
  };
  const transformed = withInlineSourcemap(original, options);

  assert.ok(transformed.code.includes('//# sourceMappingSource=vite-node'));
  assert.ok(transformed.code.includes('//# sourceMappingURL=data:application/json;charset=utf-8;base64,'));

  const extracted = extractSourceMap(transformed.code);
  assert.ok(extracted !== null);
  assert.strictEqual(extracted.version, 3);
  assert.deepStrictEqual(extracted.sources, ['greeting.js']);
  assert.strictEqual(extracted.file, 'greeting.js');
}

// 3. withInlineSourcemap preserves transformed code and returns input unmodified when sourcemap is missing
{
  const noMap = {
    code: 'const answer = 42;',
    map: null,
  };
  const options = {
    root: '/workspace',
    filepath: '/workspace/entry.js',
  };
  const result = withInlineSourcemap(noMap, options);
  assert.strictEqual(result.code, 'const answer = 42;');
  assert.ok(!result.code.includes('//# sourceMappingSource=vite-node'));

  const undefinedMap = {
    code: 'const x = 100;',
  };
  const resultUndef = withInlineSourcemap(undefinedMap, options);
  assert.strictEqual(resultUndef.code, 'const x = 100;');
  assert.ok(!resultUndef.code.includes('//# sourceMappingSource=vite-node'));
}

// 4. withInlineSourcemap returns input unmodified when code already contains vite-node sourcemap marker
{
  const alreadyProcessed = {
    code: 'const pi = 3.14;\n\n//# sourceMappingSource=vite-node\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozfQ==\n',
    map: {
      version: 3,
      sources: ['pi.js'],
      mappings: 'AAAA',
      file: 'pi.js',
    },
  };
  const options = {
    root: '/workspace',
    filepath: '/workspace/pi.js',
  };
  const result = withInlineSourcemap(alreadyProcessed, options);
  assert.strictEqual(result.code, alreadyProcessed.code);
}

// 5. withInlineSourcemap replaces existing inline sourcemap comments with vite-node inline sourcemap
{
  const legacyMapPayload = Buffer.from(
    JSON.stringify({ version: 3, sources: ['legacy.js'], mappings: 'AAAA' }),
    'utf-8'
  ).toString('base64');
  const withLegacy = {
    code: `function run() {}\n//# sourceMappingURL=data:application/json;base64,${legacyMapPayload}`,
    map: {
      version: 3,
      sources: ['run.js'],
      mappings: 'BBBB',
      file: 'run.js',
    },
  };
  const options = {
    root: '/workspace',
    filepath: '/workspace/run.js',
  };
  const result = withInlineSourcemap(withLegacy, options);

  assert.ok(!result.code.includes(legacyMapPayload));
  assert.ok(result.code.includes('//# sourceMappingSource=vite-node'));
  const decoded = extractSourceMap(result.code);
  assert.deepStrictEqual(decoded.sources, ['run.js']);
  assert.strictEqual(decoded.mappings, 'BBBB');
}

// 6. withInlineSourcemap adjusts first line mapping when mappings start with semicolon
{
  const semiMapping = {
    code: '\nconsole.log("second line");',
    map: {
      version: 3,
      sources: ['line.js'],
      mappings: ';AAAA',
      file: 'line.js',
    },
  };
  const options = {
    root: '/workspace',
    filepath: '/workspace/line.js',
  };
  const result = withInlineSourcemap(semiMapping, options);
  assert.strictEqual(result.map.mappings, 'AAAA,CAAA;AAAA');
}

// 7. withInlineSourcemap resolves absolute source paths relative to directory of filepath
{
  const absoluteSource = {
    code: 'export const value = 1;',
    map: {
      version: 3,
      sources: ['/workspace/src/modules/helper.js'],
      mappings: 'AAAA',
      file: 'index.js',
    },
  };
  const options = {
    root: '/workspace',
    filepath: '/workspace/src/index.js',
  };
  const result = withInlineSourcemap(absoluteSource, options);
  const decoded = extractSourceMap(result.code);
  assert.deepStrictEqual(decoded.sources, ['modules/helper.js']);
}

console.log('Contract passed');