replay/lib/patch_dns_lookup.js

When API testing slows you down: record and replay HTTP responses like a boss

'use strict';

// Patch DNS.lookup to resolve all hosts added via Replay.localhost as 127.0.0.1

const DNS = require('dns');
const Replay = require('./');

const originalLookup = DNS.lookup;
DNS.lookup = function (domain, options, callback) {
  if (typeof domain === 'string' && typeof options === 'object' && typeof callback === 'function' && Replay.isLocalhost(domain)) {
    const family = options.family || 4;
    const ip = family === 6 ? '::1' : '127.0.0.1';
    callback(null, ip, family);
  } else originalLookup(domain, options, callback);
};
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