Discussion on: Using Property Decorators in Typescript with a real example

[Dany Paredes]

Thanks marcel for you feedback, the article was wrote one year and half, so I need take time for remmember, nowdays most of people use npmjs.com/package/reflect-metadata. If you found why is not working or someidea leave a message or link to share, When return from my holidays I promise update the article.

[José Thomaz]

any solution for this issue?

[Jamie Miller]

Hi Jose,

I came up for a solution with this problem. One should set a value on the object themselves using a unique symbol rather than a value that is accessed on the prototype.

function Min(limit: number) {
return function(target: Object, propertyKey: string) {
const symbol = Symbol();
Object.defineProperty(target, propertyKey, {
get: function() {
return this[symbol];
},
set: function(newVal: string) {
if(newVal.length < limit) {
Object.defineProperty(target, 'errors', {
value: Your password should be bigger than ${limit}
});
}
else {
this[symbol] = newVal;
}

}
});
}
}

[Jamie Miller]

Hi Danny,

I came up for a solution with this problem. One should set a value on the object themselves using a unique symbol rather than a value that is accessed on the prototype.

function Min(limit: number) {
return function(target: Object, propertyKey: string) {
const symbol = Symbol();
Object.defineProperty(target, propertyKey, {
get: function() {
return this[symbol];
},
set: function(newVal: string) {
if(newVal.length < limit) {
Object.defineProperty(target, 'errors', {
value: Your password should be bigger than ${limit}
});
}
else {
this[symbol] = newVal;
}

}
});
}
}