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Class decorator with stage-2 proposal and Babel 7

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0

I am playing with stage-2 decorators proposal and I have found some problems with class decorators. In legacy decorator, the next example works because class decorators took as their only argument a target constructor, but with stage-2 proposal receives a object descriptor.

function log(Class) 
 return (...args) => 
 console.log(`Arguments: $args`);

 return new Class(...args);
 ;


@log
class Bar 
 constructor(name, age) 

I have read the tc39 proposal-decorators and built-in decorators,but it did not help me so much. How can I make this example works with the new proposal decorator? is it possible to use built-in decorators with babel?

To try some stuff, I developed my own basic wrap decorator, it works as expected for methods, and I want to extend its functionality to class.

const wrap = f => 
 return wrapped => 
 const kind = wrapped;

 if (kind === 'class') 
 return f(wrapped);
 
 const descriptor = wrapped;
 const original = descriptor.value;

 descriptor.value = f(original);

 return ...wrapped, descriptor ;
 ;
;

export default wrap;

With this basic decorator, I can create for example this logger method decorator that works.

import wrap from './wrap';

const loggerFunction = f => 
 const name = f.name;

 return function test(...args) 
 console.log(`starting $name with arguments $args.join(', ')`);

 return f.call(this, ...args);
 ;
;

export default wrap(loggerFunction);

And I can use it by this way:

class Foo 
 @logger
 method(argument) 
 return argument;
 

javascript class decorator babel ecmascript-next

share|improve this question

edited Mar 23 at 13:04

Fco. Alejandro Jurado Pérez

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "I developed my own basic wrap decorator" - can you show how you're using that, and where it works (or not)?
  
  – Bergi
  Mar 23 at 12:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bergi of course! I have edited my question with that example.
  
  – Fco. Alejandro Jurado Pérez
  Mar 23 at 13:06
  

  
  
  
  

add a comment | 

0

I am playing with stage-2 decorators proposal and I have found some problems with class decorators. In legacy decorator, the next example works because class decorators took as their only argument a target constructor, but with stage-2 proposal receives a object descriptor.

function log(Class) 
 return (...args) => 
 console.log(`Arguments: $args`);

 return new Class(...args);
 ;


@log
class Bar 
 constructor(name, age) 

I have read the tc39 proposal-decorators and built-in decorators,but it did not help me so much. How can I make this example works with the new proposal decorator? is it possible to use built-in decorators with babel?

To try some stuff, I developed my own basic wrap decorator, it works as expected for methods, and I want to extend its functionality to class.

const wrap = f => 
 return wrapped => 
 const kind = wrapped;

 if (kind === 'class') 
 return f(wrapped);
 
 const descriptor = wrapped;
 const original = descriptor.value;

 descriptor.value = f(original);

 return ...wrapped, descriptor ;
 ;
;

export default wrap;

With this basic decorator, I can create for example this logger method decorator that works.

import wrap from './wrap';

const loggerFunction = f => 
 const name = f.name;

 return function test(...args) 
 console.log(`starting $name with arguments $args.join(', ')`);

 return f.call(this, ...args);
 ;
;

export default wrap(loggerFunction);

And I can use it by this way:

class Foo 
 @logger
 method(argument) 
 return argument;
 

javascript class decorator babel ecmascript-next

share|improve this question

edited Mar 23 at 13:04

Fco. Alejandro Jurado Pérez

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "I developed my own basic wrap decorator" - can you show how you're using that, and where it works (or not)?
  
  – Bergi
  Mar 23 at 12:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Bergi of course! I have edited my question with that example.
  
  – Fco. Alejandro Jurado Pérez
  Mar 23 at 13:06
  

  
  
  
  

add a comment | 

I am playing with stage-2 decorators proposal and I have found some problems with class decorators. In legacy decorator, the next example works because class decorators took as their only argument a target constructor, but with stage-2 proposal receives a object descriptor.

function log(Class) 
 return (...args) => 
 console.log(`Arguments: $args`);

 return new Class(...args);
 ;


@log
class Bar 
 constructor(name, age) 

I have read the tc39 proposal-decorators and built-in decorators,but it did not help me so much. How can I make this example works with the new proposal decorator? is it possible to use built-in decorators with babel?

To try some stuff, I developed my own basic wrap decorator, it works as expected for methods, and I want to extend its functionality to class.

const wrap = f => 
 return wrapped => 
 const kind = wrapped;

 if (kind === 'class') 
 return f(wrapped);
 
 const descriptor = wrapped;
 const original = descriptor.value;

 descriptor.value = f(original);

 return ...wrapped, descriptor ;
 ;
;

export default wrap;

With this basic decorator, I can create for example this logger method decorator that works.

import wrap from './wrap';

const loggerFunction = f => 
 const name = f.name;

 return function test(...args) 
 console.log(`starting $name with arguments $args.join(', ')`);

 return f.call(this, ...args);
 ;
;

export default wrap(loggerFunction);

And I can use it by this way:

class Foo 
 @logger
 method(argument) 
 return argument;
 

javascript class decorator babel ecmascript-next

share|improve this question

edited Mar 23 at 13:04

Fco. Alejandro Jurado Pérez

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029

function log(Class) 
 return (...args) => 
 console.log(`Arguments: $args`);

 return new Class(...args);
 ;


@log
class Bar 
 constructor(name, age) 

const wrap = f => 
 return wrapped => 
 const kind = wrapped;

 if (kind === 'class') 
 return f(wrapped);
 
 const descriptor = wrapped;
 const original = descriptor.value;

 descriptor.value = f(original);

 return ...wrapped, descriptor ;
 ;
;

export default wrap;

import wrap from './wrap';

const loggerFunction = f => 
 const name = f.name;

 return function test(...args) 
 console.log(`starting $name with arguments $args.join(', ')`);

 return f.call(this, ...args);
 ;
;

export default wrap(loggerFunction);

class Foo 
 @logger
 method(argument) 
 return argument;
 

share|improve this question

edited Mar 23 at 13:04

Fco. Alejandro Jurado Pérez

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029

share|improve this question

edited Mar 23 at 13:04

Fco. Alejandro Jurado Pérez

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029

asked Mar 22 at 21:04

Fco. Alejandro Jurado PérezFco. Alejandro Jurado Pérez

7029