tsguard.macro

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

• 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;
}