/TypeScript/TypeScript interface for object with arbitrary numeric property names?

TypeScript interface for object with arbitrary numeric property names?

interface NumberToString {
    [n: number]: string;
}

var x: NumberToString;
x = { 1: 42 }; // Error
x[1].charAt(0); // OK

x['foo'] = 'bar'; // Still not an error, though

Source: stackoverflow.com

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