JavaScript Features

Osgood runs your JavaScript code using the V8 engine and therefore provides fairly modern features. For example, the following are available:

• async functions / await keyword
• class syntax and private fields
• BigInt
• destructuring assignments
• WeakMap, WeakSet
• const, let declarations
• arrow functions
• default parameters
• property shorthands
• regular expression named capture groups

JavaScript is interesting because there are many features which aren't technically part of the core language. Popular functions like alert(), setTimeout(), atob(), and fetch() are examples. They are instead features added by various implementations (such as browsers).

We specifically chose to provide features beneficial to server side JavaScript applications—features that are based on existing implementations available in other JavaScript environments.

We provide many globals which are commonly used in other JavaScript runtimes. Here's a list of them:

Generic Features

• console.{log,error,warn,info,debug,trace}
• setTimeout / setInterval / clearTimeout / clearInterval
• atob / btoa
• ReadableStream, WritableStream, TransformStream
• TextEncoder, TextDecoder
• URL, URLSearchParams

Fetch API

Instead of building an interface for making requests from scratch we chose to implement the familiar fetch() interface provided by browsers. These classes and functions all revolve around the Fetch API.

• Request: read more on Request
• Response: read more on Response
• Headers: read more on Headers
• fetch(): read more on fetch
• FormData: read more on FormData