JavaScript Support
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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 |
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Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
Yes | |
No | |
Yes |
Built-In Objects
Built-In Methods & Properties
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 App Services fully supports the following built-in modules:
Partially Supported Modules
App Services supports a subset of the functionality of the following modules.
dgram
App Services supports the following dgram APIs:
App Services does not support the following dgram APIs:
dns
App Services supports the dns module with the following exceptions:
App Services does not support the dns Promises API
App Services does not support resolver.cancel()
fs
App Services supports the following fs APIs:
http, http/2 and https
App Services supports all of the http and https APIs except for the Server class functionality.
Similarly, App Services supports only the client-side APIs of http/2.
Note
axios Supported for Sending HTTP Requests
App Services supports 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
App Services supports the following process APIs:
util
App Services supports the util module with the following exceptions:
App Services does not support util.TextEncoder
App Services does not support util.TextDecoder
crypto
App Services supports the crypto module with the following exceptions:
App Services does not support crypto.createDiffieHellman()
App Services does not support crypto.createDiffieHellmanGroup()
App Services does not support crypto.createECDH()
Unsupported Modules
Atlas Functions do not support the following built-in modules:
child_processclusterdomainreadlinev8vm