Build based on gcanti/io-ts, and add optional method to allow to define an optional properties more readable.

const AType = t.type({
  a: t.string,
  b: t.optional(t.string), // define an optional property
});

type A = t.TypeOf<typeof AType>;
//// Type A is like following:
// interface A {
//   a: string;
//   b?: string; // define an optional property
// }

• Installation
• Usage
  • Stable features
  • Experimental features (version 2.2+)

Installation

To install the stable version

npm i io-ts fp-ts

Note. fp-ts is a peer dependency for io-ts

Usage

Stable features

• index.ts module

Experimental modules (version 2.2+)

Experimental modules (*) are published in order to get early feedback from the community, see these tracking issues for further discussions and enhancements.

The experimental modules are independent and backward-incompatible with stable ones.

• Decoder.ts module
• Encoder.ts module
• Codec.ts module
• Eq.ts module
• Schema.ts module (advanced feature)

(*) A feature tagged as Experimental is in a high state of flux, you're at risk of it changing without notice.