Validate an ATProto Lexicon with atcute.

validate-lexicon.mjs

#!/usr/bin/env node
/**
 * validate-lexicon.mjs
 *
 * Validates a local AT Protocol Lexicon JSON file using atcute.
 *
 * Usage:
 *   node validate-lexicon.mjs <path-to-lexicon.json>
 *
 * Install:
 *   npm install @atcute/lexicon-doc @atcute/lexicons
 */

import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { lexiconDoc } from '@atcute/lexicon-doc';
import { ValidationError } from '@atcute/lexicons';

const filePath = process.argv[2];
if (!filePath) {
  console.error('Usage: node validate-lexicon.mjs <path-to-lexicon.json>');
  process.exit(1);
}

let doc;
try {
  doc = JSON.parse(readFileSync(resolve(filePath), 'utf8'));
} catch (err) {
  console.error(`Failed to read file: ${err.message}`);
  process.exit(1);
}

delete doc.$type
const result = lexiconDoc.try(doc);

if (!result.ok) {
  const err = new ValidationError(result._issueTree);
  console.error(`Invalid lexicon: ${filePath}`);
  for (const issue of err.issues) {
    const path = issue.path.length > 0 ? issue.path.join('.') : '(root)';
    console.error(`  ${path}: ${issue.code}${issue.expected ? ` (expected: ${JSON.stringify(issue.expected)})` : ''}`);
  }
  process.exit(1);
}

console.log(`Valid lexicon: ${result.value.id}`);