@peculiar/asn1-schema 2.9.3

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/%40peculiar/asn1-schema@2.9.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40peculiar/asn1-schema@2.9.3
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.

{"case":{"caseId":"case:sha256:e8b2fe493cdb92b79e24c98318ee19a9ac26399e6457d93a01605bf6a3e89468","constraints":{"executionContext":"node"},"contract":["assert AsnSerializer.serialize and AsnParser.parse encode and decode typed class instances with primitive and nested ASN.1 schemas","assert AsnConvert.serialize, AsnConvert.parse, and AsnConvert.toString provide high-level DER conversion and string visualization","assert AsnSerializer.toASN converts decorated class instances to asn1js objects and AsnParser.fromASN reconstructs instances from asn1js objects","assert AsnChoiceType supports CHOICE schemas with contextual tags","assert OctetString and BitString represent binary and bitstring ASN.1 values","assert AsnParser.parse throws an error when parsing malformed ASN.1 buffers"],"goal":"verify pkg:npm/%40peculiar/asn1-schema@2.9.3","kind":"HOW","packages":["pkg:npm/%40peculiar/asn1-schema@2.9.3"],"schemaVersion":1,"symbols":["AsnChoiceType","AsnConvert.parse","AsnConvert.serialize","AsnConvert.toString","AsnParser.fromASN","AsnParser.parse","AsnProp","AsnPropTypes","AsnSerializer.serialize","AsnSerializer.toASN","AsnType","AsnTypeTypes","BitString","OctetString"]},"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","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40peculiar/asn1-schema@2.9.3"],"schemaVersion":1,"subject":"pkg:npm/%40peculiar/asn1-schema@2.9.3","verifierAdapter":"node-typescript@1"}

'use strict';

const {
  AsnSerializer,
  AsnParser,
  AsnConvert,
  AsnProp,
  AsnPropTypes,
  AsnType,
  AsnTypeTypes,
  AsnChoiceType,
  OctetString,
  BitString
} = require("@peculiar/asn1-schema");

// Schema 1: Nested Sequence
class NestedItem {
  constructor(name) {
    this.name = name || "";
  }
}
AsnProp({ type: AsnPropTypes.Utf8String })(NestedItem.prototype, "name");
AsnType({ type: AsnTypeTypes.Sequence })(NestedItem);

// Schema 2: Container Sequence
class DataRecord {
  constructor(id, title, active, item, data, bitFlags, tags) {
    this.id = id || 0;
    this.title = title || "";
    this.active = active !== undefined ? active : false;
    this.item = item || new NestedItem();
    this.data = data || new OctetString();
    this.bitFlags = bitFlags || new BitString();
    this.tags = tags || [];
  }
}
AsnProp({ type: AsnPropTypes.Integer })(DataRecord.prototype, "id");
AsnProp({ type: AsnPropTypes.Utf8String })(DataRecord.prototype, "title");
AsnProp({ type: AsnPropTypes.Boolean, optional: true })(DataRecord.prototype, "active");
AsnProp({ type: NestedItem })(DataRecord.prototype, "item");
AsnProp({ type: OctetString })(DataRecord.prototype, "data");
AsnProp({ type: BitString, optional: true })(DataRecord.prototype, "bitFlags");
AsnProp({ type: AsnPropTypes.Utf8String, repeated: "sequence", optional: true })(DataRecord.prototype, "tags");
AsnType({ type: AsnTypeTypes.Sequence })(DataRecord);

// Schema 3: Choice Type
class ValueChoice {
  constructor(text, count) {
    if (text !== undefined) this.text = text;
    if (count !== undefined) this.count = count;
  }
}
AsnProp({ type: AsnPropTypes.Utf8String, context: 0 })(ValueChoice.prototype, "text");
AsnProp({ type: AsnPropTypes.Integer, context: 1 })(ValueChoice.prototype, "count");
AsnChoiceType()(ValueChoice);

module.exports = {
  NestedItem,
  DataRecord,
  ValueChoice,
  AsnSerializer,
  AsnParser,
  AsnConvert,
  AsnProp,
  AsnPropTypes,
  AsnType,
  AsnTypeTypes,
  AsnChoiceType,
  OctetString,
  BitString
};

{
  "name": "sample-peculiar-asn1-schema",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-peculiar-asn1-schema",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@peculiar/asn1-schema": "2.9.3"
      }
    },
    "node_modules/@peculiar/asn1-schema": {
      "version": "2.9.3",
      "resolved": "https://registry.npmjs.org/@peculiar/asn1-schema/-/asn1-schema-2.9.3.tgz",
      "integrity": "sha512-SOux4+jikCnOwoJvpBp/grOqzFmJPnNSwe3sAg1Bn93YdmCiDtvolZifJIhiRq0UWMTnLRPj9/ZCMAc2W9VsMQ==",
      "license": "MIT",
      "dependencies": {
        "@peculiar/utils": "^2.0.2",
        "asn1js": "^3.0.10",
        "tslib": "^2.8.1"
      }
    },
    "node_modules/@peculiar/utils": {
      "version": "2.0.3",
      "resolved": "https://registry.npmjs.org/@peculiar/utils/-/utils-2.0.3.tgz",
      "integrity": "sha512-+oL3HPFRIZ1St2K50lWCXiioIgSoxzz7R1J3uF6neO2yl1sgmpgY6XXJH4BdpoDkMWznQTeYF6oWNDZLCdQ4eQ==",
      "license": "MIT",
      "dependencies": {
        "tslib": "^2.8.1"
      }
    },
    "node_modules/asn1js": {
      "version": "3.0.10",
      "resolved": "https://registry.npmjs.org/asn1js/-/asn1js-3.0.10.tgz",
      "integrity": "sha512-S2s3aOytiKdFRdulw2qPE51MzjzVOisppcVv7jVFR+Kw0kxwvFrDcYA0h7Ndqbmj0HkMIXYWaoj7fli8kgx1eg==",
      "license": "BSD-3-Clause",
      "dependencies": {
        "pvtsutils": "^1.3.6",
        "pvutils": "^1.1.5",
        "tslib": "^2.8.1"
      },
      "engines": {
        "node": ">=12.0.0"
      }
    },
    "node_modules/pvtsutils": {
      "version": "1.3.6",
      "resolved": "https://registry.npmjs.org/pvtsutils/-/pvtsutils-1.3.6.tgz",
      "integrity": "sha512-PLgQXQ6H2FWCaeRak8vvk1GW462lMxB5s3Jm673N82zI4vqtVUPuZdffdZbPDFRoU8kAhItWFtPCWiPpp4/EDg==",
      "license": "MIT",
      "dependencies": {
        "tslib": "^2.8.1"
      }
    },
    "node_modules/pvutils": {
      "version": "1.2.0",
      "resolved": "https://registry.npmjs.org/pvutils/-/pvutils-1.2.0.tgz",
      "integrity": "sha512-BbubeCEyTuQjVMakvJQ/Sxbc93F2pwmbsxONT/ZRrwU7Ua38d8unYTwXpTVLAKJ4BDuH9IGztCjQcd/N/39Dvg==",
      "license": "MIT",
      "engines": {
        "node": ">=16.0.0"
      }
    },
    "node_modules/tslib": {
      "version": "2.8.1",
      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
      "license": "0BSD"
    }
  }
}

{
  "name": "sample-peculiar-asn1-schema",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for @peculiar/asn1-schema",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "license": "MIT-0",
  "dependencies": {
    "@peculiar/asn1-schema": "2.9.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40peculiar/asn1-schema@2.9.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40peculiar/asn1-schema@2.9.3"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

'use strict';

const assert = require("node:assert/strict");
const {
  NestedItem,
  DataRecord,
  ValueChoice,
  AsnSerializer,
  AsnParser,
  AsnConvert,
  OctetString,
  BitString
} = require("../index.js");

// 1. assert AsnSerializer.serialize and AsnParser.parse encode and decode typed class instances with primitive and nested ASN.1 schemas
{
  const item = new NestedItem("nested-payload");
  const data = new OctetString(new Uint8Array([0x01, 0x02, 0x03]));
  const record = new DataRecord(42, "test-record", true, item, data, undefined, ["alpha", "beta"]);

  const der = AsnSerializer.serialize(record);
  assert.ok(der instanceof ArrayBuffer, "serialize must return an ArrayBuffer");
  assert.ok(der.byteLength > 0, "ArrayBuffer must not be empty");

  const parsed = AsnParser.parse(der, DataRecord);
  assert.ok(parsed instanceof DataRecord, "parsed object must be an instance of DataRecord");
  assert.equal(parsed.id, 42);
  assert.equal(parsed.title, "test-record");
  assert.equal(parsed.active, true);
  assert.ok(parsed.item instanceof NestedItem);
  assert.equal(parsed.item.name, "nested-payload");
  assert.deepEqual(new Uint8Array(parsed.data.buffer), new Uint8Array([0x01, 0x02, 0x03]));
  assert.deepEqual(parsed.tags, ["alpha", "beta"]);
}

// 2. assert AsnConvert.serialize, AsnConvert.parse, and AsnConvert.toString provide high-level DER conversion and string visualization
{
  const item = new NestedItem("convert-item");
  const data = new OctetString(new Uint8Array([0xaa, 0xbb]));
  const record = new DataRecord(99, "convert-record", false, item, data);

  const der = AsnConvert.serialize(record);
  assert.ok(der instanceof ArrayBuffer, "AsnConvert.serialize must return an ArrayBuffer");

  const parsed = AsnConvert.parse(der, DataRecord);
  assert.equal(parsed.id, 99);
  assert.equal(parsed.title, "convert-record");
  assert.equal(parsed.active, false);
  assert.equal(parsed.item.name, "convert-item");

  const str = AsnConvert.toString(der);
  assert.ok(typeof str === "string", "AsnConvert.toString must return a string");
  assert.ok(str.length > 0, "String representation must not be empty");
}

// 3. assert AsnSerializer.toASN converts decorated class instances to asn1js objects and AsnParser.fromASN reconstructs instances from asn1js objects
{
  const item = new NestedItem("asn1js-item");
  const record = new DataRecord(123, "asn1js-test", true, item, new OctetString());

  const asn1Obj = AsnSerializer.toASN(record);
  assert.ok(asn1Obj, "toASN must return an ASN.1 object");

  const parsed = AsnParser.fromASN(asn1Obj, DataRecord);
  assert.ok(parsed instanceof DataRecord, "fromASN must return DataRecord instance");
  assert.equal(parsed.id, 123);
  assert.equal(parsed.title, "asn1js-test");
  assert.equal(parsed.item.name, "asn1js-item");
}

// 4. assert AsnChoiceType supports CHOICE schemas with contextual tags
{
  const textChoice = new ValueChoice("text-variant", undefined);
  const derText = AsnSerializer.serialize(textChoice);
  const parsedText = AsnParser.parse(derText, ValueChoice);
  assert.equal(parsedText.text, "text-variant");
  assert.equal(parsedText.count, undefined);

  const numChoice = new ValueChoice(undefined, 777);
  const derNum = AsnSerializer.serialize(numChoice);
  const parsedNum = AsnParser.parse(derNum, ValueChoice);
  assert.equal(parsedNum.text, undefined);
  assert.equal(parsedNum.count, 777);
}

// 5. assert OctetString and BitString represent binary and bitstring ASN.1 values
{
  const octets = new OctetString(new Uint8Array([0xde, 0xad, 0xbe, 0xef]));
  const bits = new BitString(new Uint8Array([0b11010000]).buffer, 4);

  const item = new NestedItem("bits-octets");
  const record = new DataRecord(500, "binary-data", true, item, octets, bits);

  const der = AsnConvert.serialize(record);
  const parsed = AsnConvert.parse(der, DataRecord);

  assert.deepEqual(new Uint8Array(parsed.data.buffer), new Uint8Array([0xde, 0xad, 0xbe, 0xef]));
  assert.ok(parsed.bitFlags instanceof BitString);
  assert.equal(parsed.bitFlags.unusedBits, 4);
}

// 6. assert AsnParser.parse throws an error when parsing malformed ASN.1 buffers
{
  assert.throws(() => {
    AsnParser.parse(new Uint8Array([0xff, 0xff, 0xff]), DataRecord);
  }, "AsnParser.parse must throw on invalid ASN.1 buffer");
}

console.log("All @peculiar/asn1-schema@2.9.3 contract assertions passed.");