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ObservableObject.js
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const protectedData = new WeakMap();
export class ObserverableObject extends EventTarget {
constructor(object = {}) {
super();
/* Destructure to avoid issues with frozen Objects */
protectedData.set(this, { data: { ...object }});
Object.keys(object).forEach(key => {
Object.defineProperty(this, key, {
get() {
return this.get(key);
},
set(val) {
if (typeof val === 'undefined') {
this.delete(key);
} else {
this.set(key, val);
}
},
enumerable: true,
configurable: true,
});
});
}
get(key) {
return protectedData.get(this).data[key];
}
has(key) {
return protectedData.get(this).data.hasOwnProperty(key);
}
set(key, value) {
if (typeof value === 'undefined') {
this.delete(key);
} else {
const { data, ...rest } = protectedData.get(this);
data[key] = value;
protectedData.set(this, { ...rest, data });
this.dispatchEvent(new Event(`set:${key}`));
}
return this;
}
delete(key) {
const { data, ...rest } = protectedData.get(this);
if (data.hasOwnProperty(key)) {
delete data[key];
protectedData.set(this, { data, ...rest });
this.dispatchEvent(new Event(`delete:${key}`));
}
return this;
}
toString() {
return '[object ObserverableObject]';
}
toJSON() {
return protectedData.get(this).data;
}
keys() {
return Object.keys(protectedData.get(this).data);
}
values() {
return Object.values(protectedData.get(this).data);
}
entries() {
return Object.entries(protectedData.get(this).data);
}
}