TypeScript databinding

databinding.ts

function Bindable(proto: any, name: PropertyKey) {
    const desc = Object.getOwnPropertyDescriptor(proto, name)

    delete proto.name

    if ((proto['_dispatchEvent']) == undefined) {
        Object.defineProperty(proto, '_dispatchEvent', {
            value(event: Event) {
                
            }
        })
    }
    Object.defineProperty(proto, `_${String(name)}`, {
        value: undefined
    })
    Object.defineProperty(proto, name, {
        get() {
            return this[`_${String(name)}`]
        },
        set(value) {
            const strName = String(name)
            this[`_${strName}`] = value
            this._dispatchEvent(
                new CustomEvent(`update${strName}Value`, {
                    detail: {value}
                })
            )
        }
    })
}

class Person {
    @Bindable
    name: string

    @Bindable
    age: number

    constructor(name: string, age: number) {
        this.name = name
        this.age = age
    }
}