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JavaScript Support

On this page

  • Syntax
  • Built-In Objects
  • Built-In Methods & Properties
  • Built-In Modules
  • Fully Supported Modules
  • Partially Supported Modules
  • Unsupported Modules

Atlas Functions fully support JavaScript ES5 syntax as well as most modern JavaScript features included in EcmaScript 2015 (ES6) and more recent releases. They can also access most Node.js built-in modules.

Syntax

Feature
Supported
arrow function expressions
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes

Built-In Objects

Feature
Supported
No
Yes
Yes
No
No
Yes
Yes
Yes
Yes
No

Built-In Methods & Properties

Feature
Supported
Yes
Yes
Yes
No
Yes
No
Yes
No
No

Built-In Modules

You can import and use standard Node built-in modules in Functions. Atlas Functions support most built-ins with either full or partial support. Some built-ins that are not suited for serverless workloads are not supported.

Note

The supported modules and partially supported modules are compatible with Node API version 10.18.1. Avoid using APIs in these modules introduced after or deprecated since Node 10.18.1.

Fully Supported Modules

Atlas Functions fully support the following built-in modules:

  • assert

  • buffer

  • events

  • net

  • os

  • path

  • punycode

    Note

    The built-in punycode module is deprecated. However, Atlas Functions provide the punycode module from npm automatically. You can import the module with:

    const punycode = require("punycode");

  • querystring

  • stream

  • string_decoder

  • timers

  • tls

  • tty

  • url

  • zlib

Partially Supported Modules

Atlas Functions support a subset of the functionality of the following modules.

dgram

Atlas Functions support the following dgram APIs:

Atlas Functions do not support the following dgram APIs:

dns

Atlas Functions support the dns module with the following exceptions:

fs

Atlas Functions support the following fs APIs:

http, http/2 and https

Atlas Functions support all of the http and https APIs except for the Server class functionality.

Similarly, Atlas Functions support only the client-side APIs of http/2.

Note

axios Supported for Sending HTTP Requests

Atlas Functions support v1.3.6 of the HTTP library, axios. You can replace HTTP requests sent through an HTTP Service client with calls to an HTTP library like axios.

process

Atlas Functions support the following process APIs:

util

Atlas Functions support the util module with the following exceptions:

crypto

Atlas Functions support the crypto module with the following exceptions:

Unsupported Modules

Atlas Functions do not support the following built-in modules:

  • child_process

  • cluster

  • domain

  • readline

  • v8

  • vm

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