proposal-attributes

A proposal for ECMA-262 that suggests the addition of Attributes feature.

Syntax

code:js

class Foo {}

function foo() {}

class Foo {

method() {

}

}

Attributes are EcmaScript classes which are attributed by Attribute attribute

code:javascript

class MyAttribute {}

A class attribute

code:javascript

class Foo {}

A function attribute

code:js

function foo() {}

Transpile

Attributes are roughly transpiled as below

code:js

class MyAttribute {

}

class Foo {}

This transpiles into

code:js

Symbol.attributes ??= Symbol('Symbol.attributes')

if (typeof globalThis.Attribute === 'undefined') {

globalThis.Attribute = class Attribute {}

}

class MyAttribute {}

class Foo {}

throw new TypeError('MyAttribute can\'t be used as Attribute because it is not an Attribute')

}

Prior Art

Attributes

Decorators

Annotations

Note

Anyone can fork, copy, or steal this document and/or idea.

Reference