Module for fields calculations

[sashapop10]

Describe the problem

Calculated schemas another words - Functional fields

const schema = new Schema({
  name: 'string',
  phrase: (parent, root) => 'Hello ' + parent.name + ' !',
})
const mode = true; // true - copy, false - assign; 
const sample = { name: 'Alexander' };
schema.calc(sample,true); // { result: { name: 'Alexander', phrase: 'Hello Alexander !' } };
sample; // { name: 'Alexander' }
schema.calc(sample); 
// If sample not an object in this mode - throw error
sample; // { name: 'Alexander', phrase: 'Hello Alexander !' }