@xylabs/exists

Base functionality used throughout XY Labs TypeScript/JavaScript libraries

Reference

@xylabs/exists

Functions

• exists

functions

exists

@xylabs/exists

function exists<T>(x?): x is NonNullable<T>;

Used to type narrow an object which is possibly null or undefined. Works well with functional Array methods. For example:

Type Parameters

T

T

Parameters

x?

The object which is potentially undefined or null

null | T

Returns

x is NonNullable<T>

False if the object is null/undefined, true otherwise

Example

const payloads: XyoPayload[] = boundWitness._payloads?.filter(exists) || []

Part of sdk-js

Maintainers

• Arie Trouw (arietrouw.com)
• Matt Jones
• Joel Carter
• Jordan Trouw

License

See the LICENSE file for license details

Credits

Made with 🔥 and ❄️ by XYLabs