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Note:

When this guide is more complete, the plan is to move it into Prepack documentation.
For now I put it out as a gist to gather initial feedback.

A Gentle Introduction to Prepack (Part 1)

If you're building JavaScript apps, you might already be familiar with some tools that compile JavaScript code to equivalent JavaScript code:

• Babel lets you use newer JavaScript language features, and outputs equivalent code that targets older JavaScript engines.

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import { isType } from './typeguardHelper';
import { Car, carRuleSet, Engine, engineRuleSet, Wheel, wheelRuleSet } from './Car';

const mockEngine: Engine = {
  cylinders: 8,
  maxSpeed: 7400,
  fuelType: 'diesel'
};

const mockWheel: Wheel = {