fakerdb/streams/jsf.js

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/**
 * transformation stream: generate JSON schema instances from a replayed stream of JSON schema
 * @param jsf - JSON Schema Faker instance
 */
var { Transform } = require('stream');

module.exports = function (options) {

  let jsf = options ? options.jsf : null;
  if (!jsf) {
    jsf = require('json-schema-faker')
    let { Chance } = require('chance')
      , faker = require('faker');
    jsf.extend('faker', () => faker);
    jsf.extend('chance', () => new Chance());
  }
  
  return new Transform({
    readableObjectMode: true,
    writableObjectMode: true,

    transform(chunk, encoding, callback) {
      try {
        jsf.resolve(JSON.parse(chunk))
          .then(value => callback(null, JSON.stringify(value)));
      } catch(e) {
        callback(e)
      }
    }
  });
}