TypeScript interface: how to declare a property of Array type?

Question

I have the following interface:

export interface ITransaction {
   id: number;
   description: string;
   category: string;
   tags: array;
   date: string;
   amount: number;
}

Obviously I'm declaring it wrong as I'm seeing an error in my editor. As you can see, tags ought to be an array. This is how the data look in JSON format:

{
   "id": 1,
   "description": "Sandwich",
   "date": "2017-09-01",
   "category": "Take away",
   "tags": ["Holidays"],
   "amount": -2
}

I can't seem to find this in the docs. How can I put this property correctly into the interface?

tags: string[] or tags: Array<string>

toskv
– toskv

2017-09-03 20:42:30 +00:00
Commented Sep 3, 2017 at 20:42 — toskv
– toskv, Commented Sep 3, 2017 at 20:42
typescriptlang.org/docs/handbook/basic-types.html#array

str
– str

2017-09-03 20:46:17 +00:00
Commented Sep 3, 2017 at 20:46 — str
– str, Commented Sep 3, 2017 at 20:46

Gass · Accepted Answer · 2022-02-03 15:03:12Z

14

See TypeScript basic types:

export interface ITransaction {
  ...
  tags: string[]
  ...
}

edited Feb 3, 2022 at 15:03

Gass

9,6405 gold badges47 silver badges53 bronze badges

answered Sep 3, 2017 at 20:47

Harald Gliebe

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