How to define an object of specific functions as a type or an interface?

Question

I've attempted to look at other similar questions, but most of them appear to be defining arrays instead of objects.

I'm mostly new to Typescript as a whole, and am still trying to wrangle some of the concepts, having both experience in C# and JavaScript.

I'm making an object that is a collection of one or more named functions in an object. Each function accepts an array of strings, or multiple strings, as the following definition:

define function PluginCommand(argv: array, ...args:string[]): number;

Now, how can I assign multiple of these PluginCommands to a (preferably) defined object where the key can be any valid string?

Looking for Record<string, PluginCommand> perhaps? Equivalently: {[key: string]: PluginCommand}. — CRice
– CRice, Commented Dec 15, 2020 at 16:42

Shao · Accepted Answer · 2020-12-15 16:45:21Z

1

You should be able to do something like:

interface Foo {
  bar: (args: Array<string>) => number;
}

If you want the key to be any string, do:

interface Foo {
  [key: string]: (args: Array<string>) => number;
}

answered Dec 15, 2020 at 16:45

Shao

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3 Comments

Atlas Sullivan Over a year ago

How would this work for an object of multiple elements? like {a:PluginCommand,b:PluginCommand...}?

Shao Over a year ago

Given the above interface "Foo", and the function "PluginCommand", you could just do: const myObject: Foo = { a: PluginCommand, b: PluginCommand }

Atlas Sullivan Over a year ago

Ah, yes, I understand now. Thank you.

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