What is wrong with this TypeScript declaration?

Question

I'm declaring this:

export interface Interface {
    func: string[][] => string[][];
}

And I'm getting this:

error TS1005: ';' expected.

func: string[][] => string[][];
                 ~~

error TS1131: Property or signature expected.

func: string[][] => string[][];
                    ~~~~~~

error TS1011: An element access expression should take an argument.

func: string[][] => string[][];

error TS1011: An element access expression should take an argument.

func: string[][] => string[][];

error TS1128: Declaration or statement expected.

}
~

What is the correct syntax here?

You need to define an argument name, eg (arg: string[][])

CertainPerformance
– CertainPerformance

2020-04-17 07:19:14 +00:00
Commented Apr 17, 2020 at 7:19 — CertainPerformance
– CertainPerformance, Commented Apr 17, 2020 at 7:19

Andrey Mormysh · Accepted Answer · 2020-04-17 07:38:24Z

2

The arrow function '=>' creates an expression. An interface on another hand is a definition, so you would do it like so:

export interface Interface {
  func(arg: string[][]): string[][];
}

answered Apr 17, 2020 at 7:38

Andrey Mormysh

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