tsguard.macro - Typescript type guard macro

Babel macro that automatically generates type guards for a given type (very much WIP). You'll need to install generic-type-guards for this to work.

Roadmap

• [x] Implement tests
• [ ] Support type references (e.g. typeGuard<IProps>)
• [ ] Support tuples
• [ ] Support mapped types
• [ ] Support rest operator
• [ ] Support index accessed types

Usage

import typeGuard from "tsguard.macro";

const unsafeValue = await fetch(someUrl).then(res => res.json());

if (typeGuard<{ name: string; value?: number }>(unsafeValue)) {
  const safeValue: { name: string; value?: number } = unsafeValue;
}