Object.setPrototypesOf

multiple inheritance using Proxies

where

https://cdn.jsdelivr.net/npm/[email protected]/setPrototypesOf.min.js

what

Set multiple [[Prototype]] linkages

Object.setPrototypesOf(target, prototype1, prototype2, ...);

how

const obj = {};

const baseObj1 = {prop: 'value'};
const baseObj2 = {prop2: 'value2'};
const baseObj3 = {prop3: 'value3'};

Object.setPrototypesOf(obj, baseObj1, baseObj2, baseObj3);

get

obj.prop; // 'value
obj.prop2; // 'value2
obj.prop3; // 'value3

set

obj.prop = 'new value';
obj.prop2 = 'new value2';
obj.prop3 = 'new value3';

obj; // {prop: 'new value', prop2: 'new value2', prop3: 'new value3'}

// WARNING
baseObj1.prop; // 'value'
baseObj2.prop2; // 'value2'
baseObj3.prop3; // 'value3'

getters

this into getters will point to obj if a getter was invoked by obj itself

aBaseObj; // {get foo() { return this.bar }, bar: 42}
obj; // {bar:'baz'}

obj.foo; // 'baz'

setters

this into setters will point to obj if a setter was invoked by obj itself

aBaseObj; // {set foo(value) { this.bar = value }, bar: 42}
obj; // {}

obj.foo = 'baz';
obj; // {bar: 'baz'}

// WARNING
aBaseObj; // {bar: 42}

invariants

• target must be an object, a null value is not accepted
• minimum number of required prototypes: 2 (otherwise use Object.setPrototypeOf)
• all prototypes must be object, a null value is not accepted