TypeScript autocomplete and type checking

What is this?

Would you like your editor to support auto-completion and other advanced IDE features when editing dnsconfig.js? Yes you can!

While DNSControl does not support TypeScript syntax in dnsconfig.js, you can still use TypeScript’s features in editors which support it.

If you’re using Visual Studio Code (or another editor that supports TypeScript), you should now be able to see the type information in your dnsconfig.js file as you type. Hover over record names to read their documentation without having to open the documentation website!

How to activate auto-completion

To set up TypeScript support in Visual Studio Code, follow these steps:

1. Run this command to generate the file types-dnscontrol.d.ts.

dnscontrol write-types

This file has all the information your editor or IDE needs. It must be in the same directory as the dnsconfig.js file you are editing.

1. Tell your editor

At this point some features (autocomplete) will work. However to get the full experience, including type checking (i.e. red squiggly underlines when you misuse APIs), there is one more step.

Add these comments to the top of your dnsconfig.js file:

// @ts-check
/// <reference path="types-dnscontrol.d.ts" />

That should be all you need to do!

Bugs?

Known bugs/issue

Bug: CLI_DEFAULTS not implemented

Values passed to CLI_DEFAULTS (and the corresponding -v command-line option) don’t show up as global variables

Workaround: create a new .d.ts file in the same folder as your dnsconfig.js file. In that file, add the following line for each variable you want to use (replacing VARIABLE_NAME with the name of the variable).

declare const VARIABLE_NAME: string;

This will tell TypeScript that the variable exists, and that it’s a string.

Known issue: FETCH not always accurate

FETCH is always shown as available, even if you don’t run DNSControl with the --allow-fetch flag.