Issue with Destructuring Assignment Syntax in TypeScript

interface User extends Function {
    player: number,
    units: number[],
    sites: string[],
}
class User extends Function {
    constructor() {
        super('return this.player')
        [this.player, this.units, this.sites] = getBelongings(); // Destructuring Assignment
        
    }
}
const me = new User();
function getBelongings(): [number, number[], string[]] {
    return [1, [1], ['1']]
}

Playground Link

The scenario above looks promising, and I am confident that my code is correct.

However, an error message appears:

Type 'string[]' cannot be used as an index type.(2538)

I have used destructuring in the past without issues, so I am unsure why this problem is happening now.

Could it be a TypeScript issue or a mistake in my syntax? How can I resolve this and ensure smooth operation of the code? Thank you for your assistance.

Answer №1

Make sure to remember the semi colon following the call to super; otherwise, both statements will try to execute together.

The current code may be misinterpreted as accessing an index instead of being a standalone statement.

super('return this.player');   // <-- don't forget the semi colon
[this.player, this.units, this.sites] = getBelongings(); 

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