CodeSampleX

Sample

vite-node 2.1.9: withInlineSourcemap

Verified sample for npm vite-node 2.1.9: withInlineSourcemap. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:c6bd5cb4548257c335bc99ecae6c11211afb8c73f81c19a9ff0b1b7438422a7b

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…		 2026-09-16

Case

HOW
Goal
verify vite-node.withInlineSourcemap in pkg:npm/vite-node@2.1.9
Packages
Symbols
  • vite-node.withInlineSourcemap
Created
2026-09-16T16:56:48Z

Contract

  1. withInlineSourcemap is exported as a function by vite-node/source-map
  2. withInlineSourcemap appends inline base64 sourcemap comment and marker to transformed code
  3. withInlineSourcemap preserves transformed code and returns input unmodified when sourcemap is missing
  4. withInlineSourcemap returns input unmodified when code already contains vite-node sourcemap marker
  5. withInlineSourcemap replaces existing inline sourcemap comments with vite-node inline sourcemap
  6. withInlineSourcemap adjusts first line mapping when mappings start with semicolon
  7. withInlineSourcemap resolves absolute source paths relative to directory of filepath

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • 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.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.
csx.json
{"case":{"caseId":"case:sha256:7f3191db2e54b70a756dc6ff6251a5494081658011766c9ad70694ad8ec11ea4","contract":["withInlineSourcemap is exported as a function by vite-node/source-map","withInlineSourcemap appends inline base64 sourcemap comment and marker to transformed code","withInlineSourcemap preserves transformed code and returns input unmodified when sourcemap is missing","withInlineSourcemap returns input unmodified when code already contains vite-node sourcemap marker","withInlineSourcemap replaces existing inline sourcemap comments with vite-node inline sourcemap","withInlineSourcemap adjusts first line mapping when mappings start with semicolon","withInlineSourcemap resolves absolute source paths relative to directory of filepath"],"goal":"verify vite-node.withInlineSourcemap in pkg:npm/vite-node@2.1.9","kind":"HOW","packages":["pkg:npm/vite-node@2.1.9"],"schemaVersion":1,"symbols":["vite-node.withInlineSourcemap"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/vite-node@2.1.9"],"schemaVersion":1,"subject":"pkg:npm/vite-node@2.1.9","symbols":["vite-node.withInlineSourcemap"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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      "integrity": "sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==",
      "license": "MIT",
      "dependencies": {
        "esbuild": "^0.21.3",
        "postcss": "^8.4.43",
        "rollup": "^4.20.0"
      },
      "bin": {
        "vite": "bin/vite.js"
      },
      "engines": {
        "node": "^18.0.0 || >=20.0.0"
      },
      "funding": {
        "url": "https://github.com/vitejs/vite?sponsor=1"
      },
      "optionalDependencies": {
        "fsevents": "~2.3.3"
      },
      "peerDependencies": {
        "@types/node": "^18.0.0 || >=20.0.0",
        "less": "*",
        "lightningcss": "^1.21.0",
        "sass": "*",
        "sass-embedded": "*",
        "stylus": "*",
        "sugarss": "*",
        "terser": "^5.4.0"
      },
      "peerDependenciesMeta": {
        "@types/node": {
          "optional": true
        },
        "less": {
          "optional": true
        },
        "lightningcss": {
          "optional": true
        },
        "sass": {
          "optional": true
        },
        "sass-embedded": {
          "optional": true
        },
        "stylus": {
          "optional": true
        },
        "sugarss": {
          "optional": true
        },
        "terser": {
          "optional": true
        }
      }
    },
    "node_modules/vite-node": {
      "version": "2.1.9",
      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-2.1.9.tgz",
      "integrity": "sha512-AM9aQ/IPrW/6ENLQg3AGY4K1N2TGZdR5e4gu/MmmR2xR3Ll1+dib+nook92g4TV3PXVyeyxdWwtaCAiUL0hMxA==",
      "license": "MIT",
      "dependencies": {
        "cac": "^6.7.14",
        "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"
      }
    }
  }
}
package.json
{
  "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"
  }
}
spec.json
{
  "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"
  ]
}
test/contract.mjs
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');

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