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How to flowtype mix-in class factories?

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3

2

I'm migrating to Flow an internal JavaScript framework that heavily relies on ES6 mix-in, with class factories structured along the lines of:

function Mixin(Base) 
 return class extend Base 

 constructor() super() 

 mixin() … 

 

but I'm unable to write correct generic type annotations for such methods.

So far my best guess is:

interface IMixin 

 mixin():void;



function Mixin<T>(Base: Class<T>): Class<T & IMixin> 
 return class extend Base implements IMixin 

 constructor() super() 

 mixin() … 

 

which is loosely related to https://stackoverflow.com/a/33030114/739773, but invariable causes Flow to complain with Flow: Cannot return 'class ... ' because class '<<anonymous class>>' [1] is incompatible with 'T' [2]., regardless of the minor variations I tested.

What am I missing? Any hints short of disabling type checking for such functions?

javascript flowtype

share|improve this question

edited Mar 27 at 14:59

A'B

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  apparently not feasible :-( see github.com/facebook/flow/issues/7595#issuecomment-478151944
  
  – A'B
  Mar 30 at 10:07
  
  

  
  
  
  

add a comment | 

3

2

I'm migrating to Flow an internal JavaScript framework that heavily relies on ES6 mix-in, with class factories structured along the lines of:

function Mixin(Base) 
 return class extend Base 

 constructor() super() 

 mixin() … 

 

but I'm unable to write correct generic type annotations for such methods.

So far my best guess is:

interface IMixin 

 mixin():void;



function Mixin<T>(Base: Class<T>): Class<T & IMixin> 
 return class extend Base implements IMixin 

 constructor() super() 

 mixin() … 

 

which is loosely related to https://stackoverflow.com/a/33030114/739773, but invariable causes Flow to complain with Flow: Cannot return 'class ... ' because class '<<anonymous class>>' [1] is incompatible with 'T' [2]., regardless of the minor variations I tested.

What am I missing? Any hints short of disabling type checking for such functions?

javascript flowtype

share|improve this question

edited Mar 27 at 14:59

A'B

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  apparently not feasible :-( see github.com/facebook/flow/issues/7595#issuecomment-478151944
  
  – A'B
  Mar 30 at 10:07
  
  

  
  
  
  

add a comment | 

I'm migrating to Flow an internal JavaScript framework that heavily relies on ES6 mix-in, with class factories structured along the lines of:

function Mixin(Base) 
 return class extend Base 

 constructor() super() 

 mixin() … 

 

but I'm unable to write correct generic type annotations for such methods.

So far my best guess is:

interface IMixin 

 mixin():void;



function Mixin<T>(Base: Class<T>): Class<T & IMixin> 
 return class extend Base implements IMixin 

 constructor() super() 

 mixin() … 

 

which is loosely related to https://stackoverflow.com/a/33030114/739773, but invariable causes Flow to complain with Flow: Cannot return 'class ... ' because class '<<anonymous class>>' [1] is incompatible with 'T' [2]., regardless of the minor variations I tested.

What am I missing? Any hints short of disabling type checking for such functions?

javascript flowtype

share|improve this question

edited Mar 27 at 14:59

A'B

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges

function Mixin(Base) 
 return class extend Base 

 constructor() super() 

 mixin() … 

 

interface IMixin 

 mixin():void;



function Mixin<T>(Base: Class<T>): Class<T & IMixin> 
 return class extend Base implements IMixin 

 constructor() super() 

 mixin() … 

 

share|improve this question

edited Mar 27 at 14:59

A'B

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges

share|improve this question

edited Mar 27 at 14:59

A'B

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges

asked Mar 27 at 13:51

A'BA'B

38911 silver badge99 bronze badges