Optional Packages

Left-shift optional function arguments.

Create decorator with options and universal signature

TypeScript maybe monad for reaching child fields inside complicated objects.

Make creating of objects with conditional properties easier.

An Option type for Flow, inspired by Rust.

Nullable. Optional. The Maybe monad. Whatever you want to call it, it's for Javascript now.

plain implementation of Maybe (Optional, Nullable) monad

Safely parse JSON strings while explicitly indicating the behaviour in case of a parsing error

Make the 'new' keyword optional for ES6 classes

Return default value for object properties that does not exists i.e is undefined.

Creates Shields.io badge URLs for David.

A library for paranoid JavaScript developers

Get object key or default value

TypeScript Option Implementation

Wrap optional values

A very simple implementation of an optional type in typescript

Optional types for TypeScript

A runtime assertion for preserving not-null and not-undefined invariants

For when a promise has an optional return value

Array of "optional tags" defined by the HTML specification.