form-data 4.0.6

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 pkg:npm/form-data@4.0.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/form-data@4.0.6
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - 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.

{"case":{"caseId":"case:sha256:06e50286fe386c011404288e0c9100ce0eba5c2c0539a8023f4eac1a75ee2251","constraints":{"executionContext":"node"},"contract":["FormData appends text fields and generates standard multipart boundary","FormData.getHeaders returns multipart/form-data content-type with boundary and merges extra headers","FormData.hasKnownLength returns true for buffer and string fields and getLengthSync returns total byte length","FormData.getBuffer returns complete multipart payload containing field names and values","FormData appends buffer with custom filename and contentType options","FormData.setBoundary sets a custom boundary string for stream and headers","FormData.getLength asynchronously calculates total byte length matching getLengthSync"],"goal":"verify pkg:npm/form-data@4.0.6","kind":"HOW","packages":["pkg:npm/form-data@4.0.6"],"schemaVersion":1},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/form-data@4.0.6"],"schemaVersion":1,"subject":"pkg:npm/form-data@4.0.6","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-form-data",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-form-data",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "form-data": "4.0.6"
      }
    },
    "node_modules/asynckit": {
      "version": "0.4.0",
      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
      "license": "MIT"
    },
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      "version": "1.0.2",
      "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
      "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
      "license": "MIT",
      "dependencies": {
        "es-errors": "^1.3.0",
        "function-bind": "^1.1.2"
      },
      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/combined-stream": {
      "version": "1.0.8",
      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
      "license": "MIT",
      "dependencies": {
        "delayed-stream": "~1.0.0"
      },
      "engines": {
        "node": ">= 0.8"
      }
    },
    "node_modules/delayed-stream": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
      "license": "MIT",
      "engines": {
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      }
    },
    "node_modules/dunder-proto": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
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      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      }
    },
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      "version": "1.3.0",
      "resolved": "https://registry.npmjs.org/es-errors/-/es-errors-1.3.0.tgz",
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      "engines": {
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    },
    "node_modules/es-object-atoms": {
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    },
    "node_modules/es-set-tostringtag": {
      "version": "2.1.0",
      "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
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      "license": "MIT",
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        "hasown": "^2.0.2"
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      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/form-data": {
      "version": "4.0.6",
      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.6.tgz",
      "integrity": "sha512-vKatAh4SlVfgbv+YtmhiRjhEMJsYpsG1Y2rMQtR+SVSbytsSD1YGzDIcrAJmdFec88u/+VoGmxnl+80gL1tRCQ==",
      "license": "MIT",
      "dependencies": {
        "asynckit": "^0.4.0",
        "combined-stream": "^1.0.8",
        "es-set-tostringtag": "^2.1.0",
        "hasown": "^2.0.4",
        "mime-types": "^2.1.35"
      },
      "engines": {
        "node": ">= 6"
      }
    },
    "node_modules/function-bind": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
      "integrity": "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA==",
      "license": "MIT",
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/get-intrinsic": {
      "version": "1.3.0",
      "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.3.0.tgz",
      "integrity": "sha512-9fSjSaos/fRIVIp+xSJlE6lfwhES7LNtKaCBIamHsjr2na1BiABJPo0mOjjz8GJDURarmCPGqaiVg5mfjb98CQ==",
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      "dependencies": {
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        "es-define-property": "^1.0.1",
        "es-errors": "^1.3.0",
        "es-object-atoms": "^1.1.1",
        "function-bind": "^1.1.2",
        "get-proto": "^1.0.1",
        "gopd": "^1.2.0",
        "has-symbols": "^1.1.0",
        "hasown": "^2.0.2",
        "math-intrinsics": "^1.1.0"
      },
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/get-proto": {
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      "resolved": "https://registry.npmjs.org/get-proto/-/get-proto-1.0.1.tgz",
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      "dependencies": {
        "dunder-proto": "^1.0.1",
        "es-object-atoms": "^1.0.0"
      },
      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/gopd": {
      "version": "1.2.0",
      "resolved": "https://registry.npmjs.org/gopd/-/gopd-1.2.0.tgz",
      "integrity": "sha512-ZUKRh6/kUFoAiTAtTYPZJ3hw9wNxx+BIBOijnlG9PnrJsCcSjs1wyyD6vJpaYtgnzDrKYRSqf3OO6Rfa93xsRg==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
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      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.1.0.tgz",
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      "license": "MIT",
      "engines": {
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      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
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      "engines": {
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      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
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    },
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      "license": "MIT",
      "engines": {
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    },
    "node_modules/mime-db": {
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      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
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      "license": "MIT",
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    },
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      "engines": {
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      }
    }
  }
}

{
  "name": "sample-form-data",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "form-data": "4.0.6"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/form-data@4.0.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/form-data@4.0.6"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}

const assert = require('node:assert');
const FormData = require('form-data');

// 1. FormData appends text fields and generates standard multipart boundary
const form1 = new FormData();
form1.append('username', 'sample-user');
form1.append('status', 'active');
const boundary1 = form1.getBoundary();
assert.strictEqual(typeof boundary1, 'string');
assert.ok(boundary1.length > 0);

// 2. FormData.getHeaders returns multipart/form-data content-type with boundary and merges extra headers
const headers1 = form1.getHeaders();
assert.strictEqual(headers1['content-type'], 'multipart/form-data; boundary=' + boundary1);
const headersWithCustom = form1.getHeaders({ 'x-custom-header': 'custom-value' });
assert.strictEqual(headersWithCustom['x-custom-header'], 'custom-value');
assert.strictEqual(headersWithCustom['content-type'], 'multipart/form-data; boundary=' + boundary1);

// 3. FormData.hasKnownLength returns true for buffer and string fields and getLengthSync returns total byte length
assert.strictEqual(form1.hasKnownLength(), true);
const totalLength = form1.getLengthSync();
assert.strictEqual(typeof totalLength, 'number');
assert.ok(totalLength > 0);

// 4. FormData.getBuffer returns complete multipart payload containing field names and values
const buffer1 = form1.getBuffer();
assert.ok(Buffer.isBuffer(buffer1));
assert.strictEqual(buffer1.length, totalLength);
const payload = buffer1.toString('utf8');
assert.ok(payload.includes('name="username"'));
assert.ok(payload.includes('sample-user'));
assert.ok(payload.includes('name="status"'));
assert.ok(payload.includes('active'));

// 5. FormData appends buffer with custom filename and contentType options
const form2 = new FormData();
form2.append('attachment', Buffer.from('sample-payload-content'), {
  filename: 'document.txt',
  contentType: 'text/plain'
});
const buffer2 = form2.getBuffer().toString('utf8');
assert.ok(buffer2.includes('filename="document.txt"'));
assert.ok(buffer2.includes('Content-Type: text/plain'));
assert.ok(buffer2.includes('sample-payload-content'));

// 6. FormData.setBoundary sets a custom boundary string for stream and headers
const form3 = new FormData();
form3.setBoundary('custom_test_boundary_9999');
assert.strictEqual(form3.getBoundary(), 'custom_test_boundary_9999');
assert.strictEqual(
  form3.getHeaders()['content-type'],
  'multipart/form-data; boundary=custom_test_boundary_9999'
);

// 7. FormData.getLength asynchronously calculates total byte length matching getLengthSync
form1.getLength((err, length) => {
  assert.ifError(err);
  assert.strictEqual(length, totalLength);
});

console.log('Contract passed');