parse-conflict-json 4.0.0

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/parse-conflict-json@4.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/parse-conflict-json@4.0.0

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:ca10eb6722dc3854c82c4ad826ad7773dcb4e237d1d030feadb45d320f58b3a4","contract":["parseConflictJson parses plain JSON without conflict markers and isDiff returns falsy","parseConflictJson resolves diff3-style JSON conflicts (\u003c{7}, |{7}, ={7}, \u003e{7}) preferring 'ours' by default or 'theirs' when specified","parseConflictJson applies an optional JSON reviver to parent, ours, and theirs branches before merging","parseConflictJson throws TypeError when prefer is neither 'ours' nor 'theirs'"],"goal":"verify pkg:npm/parse-conflict-json@4.0.0","kind":"HOW","packages":["pkg:npm/parse-conflict-json@4.0.0"],"schemaVersion":1,"symbols":["parseConflictJSON","isDiff"]},"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/parse-conflict-json@4.0.0"],"schemaVersion":1,"subject":"pkg:npm/parse-conflict-json@4.0.0","verifierAdapter":"node-typescript@1"}

{
  "name": "verify-parse-conflict-json",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "verify-parse-conflict-json",
      "version": "1.0.0",
      "dependencies": {
        "parse-conflict-json": "4.0.0"
      }
    },
    "node_modules/json-parse-even-better-errors": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/json-parse-even-better-errors/-/json-parse-even-better-errors-4.0.0.tgz",
      "integrity": "sha512-lR4MXjGNgkJc7tkQ97kb2nuEMnNCyU//XYVH0MKTGcXEiSudQ5MKGKen3C5QubYy0vmq+JGitUg92uuywGEwIA==",
      "license": "MIT",
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    },
    "node_modules/just-diff": {
      "version": "6.0.2",
      "resolved": "https://registry.npmjs.org/just-diff/-/just-diff-6.0.2.tgz",
      "integrity": "sha512-S59eriX5u3/QhMNq3v/gm8Kd0w8OS6Tz2FS1NG4blv+z0MuQcBRJyFWjdovM0Rad4/P4aUPFtnkNjMjyMlMSYA==",
      "license": "MIT"
    },
    "node_modules/just-diff-apply": {
      "version": "5.5.0",
      "resolved": "https://registry.npmjs.org/just-diff-apply/-/just-diff-apply-5.5.0.tgz",
      "integrity": "sha512-OYTthRfSh55WOItVqwpefPtNt2VdKsq5AnAK6apdtR6yCH8pr0CmSr710J0Mf+WdQy7K/OzMy7K2MgAfdQURDw==",
      "license": "MIT"
    },
    "node_modules/parse-conflict-json": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/parse-conflict-json/-/parse-conflict-json-4.0.0.tgz",
      "integrity": "sha512-37CN2VtcuvKgHUs8+0b1uJeEsbGn61GRHz469C94P5xiOoqpDYJYwjg4RY9Vmz39WyZAVkR5++nbJwLMIgOCnQ==",
      "license": "ISC",
      "dependencies": {
        "json-parse-even-better-errors": "^4.0.0",
        "just-diff": "^6.0.0",
        "just-diff-apply": "^5.2.0"
      },
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    }
  }
}

{
  "name": "verify-parse-conflict-json",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "parse-conflict-json": "4.0.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/parse-conflict-json@4.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/parse-conflict-json@4.0.0"
  ]
}

import parseConflictJson from 'parse-conflict-json';

export function parseConflictedJson(input, reviver, prefer) {
  return parseConflictJson(input, reviver, prefer);
}

export function hasConflictMarkers(input) {
  return Boolean(parseConflictJson.isDiff(input));
}

import assert from 'node:assert/strict';
import parseConflictJson from 'parse-conflict-json';
import { parseConflictedJson, hasConflictMarkers } from '../src/index.mjs';

const stripFormattingSymbols = (obj) => JSON.parse(JSON.stringify(obj));

// 1. Plain JSON without conflict markers
const plainJson = '{"name": "sample", "count": 1}';
assert.equal(hasConflictMarkers(plainJson), false);
const parsedPlain = parseConflictedJson(plainJson);
assert.deepEqual(stripFormattingSymbols(parsedPlain), { name: 'sample', count: 1 });
// json-parse-even-better-errors attaches Symbol.for('indent') and Symbol.for('newline')
assert.equal(parsedPlain[Symbol.for('indent')], '');
assert.equal(parsedPlain[Symbol.for('newline')], '');

// 2. 3-way merge conflict (diff3 style with <<<<<<<, |||||||, =======, >>>>>>>)
const conflicted3Way = [
  '{',
  '<<<<<<< HEAD',
  '  "shared": "ours",',
  '  "leftOnly": 10',
  '||||||| parent',
  '  "shared": "base"',
  '=======',
  '  "shared": "theirs",',
  '  "rightOnly": 20',
  '>>>>>>> branch',
  '}'
].join('\n');

assert.equal(hasConflictMarkers(conflicted3Way), true);

// Default prefer is 'ours'
const resolvedOurs = parseConflictedJson(conflicted3Way);
assert.deepEqual(stripFormattingSymbols(resolvedOurs), {
  shared: 'ours',
  leftOnly: 10,
  rightOnly: 20
});

// Prefer 'theirs'
const resolvedTheirs = parseConflictedJson(conflicted3Way, null, 'theirs');
assert.deepEqual(stripFormattingSymbols(resolvedTheirs), {
  shared: 'theirs',
  leftOnly: 10,
  rightOnly: 20
});

// 3. Reviver function support on conflicted JSON
const revived = parseConflictJson(
  conflicted3Way,
  (key, val) => (typeof val === 'number' ? val * 2 : val),
  'ours'
);
assert.deepEqual(stripFormattingSymbols(revived), {
  shared: 'ours',
  leftOnly: 20,
  rightOnly: 40
});

// 4. Invalid prefer parameter throws TypeError
assert.throws(
  () => parseConflictJson(plainJson, null, 'invalid'),
  {
    name: 'TypeError',
    message: /prefer param must be "ours" or "theirs" if set/
  }
);