Discrepancy between Javascript and Typescript in struct module

class A implements Inspectable.Inspectable {
    constructor(readonly x: number) {}

    toString(): string {
        return 'foo';
    }
    toJSON(): unknown {
        return { x: this.x };
    }
    [Inspectable.NodeInspectSymbol](): unknown {
        return this.toJSON();
    }
}

export const make = ({x}:{readonly x: number}): A => new A(x);
// Ouch I forgot to call make(). The compiler does not warn me
export const addOne = (a: A): A => pipe(a, Struct.evolve({ x: Number.sum(1) }));
const a = new A(1);
const a1 = addOne(a);
// [object Object] instead of foo. Can lead to bugs hard to identify
console.log(a1.toString());