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Exclude type from typescript array of types

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3

1

Suppose i have these types

 /** Types of a function's arguments */
export type ArgumentTypes<F extends Function> = F extends (...args: infer A) => any ? A : never;

export type ExcludeQueryParams<T> = [P in keyof T]: T[P] extends PagingParameters ? never : T[P] 

Then i have this code to extract the types of the arguments for a function

function test(query: PagingParameters, as: number, f: string) 
 return 1;


type argTypes = ArgumentTypes<typeof test>
type result = ExcludeQueryParams<argTypes>

Above, argTypes will equal [PagingParameters, number, string]

What i am trying to do is extract the PagingParameters type from the array so result is [number, string], however using ExcludeQueryParams the result is [never, number, string].

How can achieve this properly without the final type array containing the never type?

typescript

share|improve this question

edited Mar 7 at 3:29

joeblow

asked Mar 7 at 2:51

joeblowjoeblow

162

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What are you doing with the ExcludeQueryParams type?
  
  – Shaun Luttin
  Mar 7 at 3:23
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  view edit @ShaunLuttin
  
  – joeblow
  Mar 7 at 3:30
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Related: Typescript: Remove entries from tuple type
  
  – CRice
  Mar 7 at 3:36
  

  
  
  
  

add a comment | 

3

1

Suppose i have these types

 /** Types of a function's arguments */
export type ArgumentTypes<F extends Function> = F extends (...args: infer A) => any ? A : never;

export type ExcludeQueryParams<T> = [P in keyof T]: T[P] extends PagingParameters ? never : T[P] 

Then i have this code to extract the types of the arguments for a function

function test(query: PagingParameters, as: number, f: string) 
 return 1;


type argTypes = ArgumentTypes<typeof test>
type result = ExcludeQueryParams<argTypes>

Above, argTypes will equal [PagingParameters, number, string]

What i am trying to do is extract the PagingParameters type from the array so result is [number, string], however using ExcludeQueryParams the result is [never, number, string].

How can achieve this properly without the final type array containing the never type?

typescript

share|improve this question

edited Mar 7 at 3:29

joeblow

asked Mar 7 at 2:51

joeblowjoeblow

162

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What are you doing with the ExcludeQueryParams type?
  
  – Shaun Luttin
  Mar 7 at 3:23
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  view edit @ShaunLuttin
  
  – joeblow
  Mar 7 at 3:30
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Related: Typescript: Remove entries from tuple type
  
  – CRice
  Mar 7 at 3:36
  

  
  
  
  

add a comment | 

Suppose i have these types

 /** Types of a function's arguments */
export type ArgumentTypes<F extends Function> = F extends (...args: infer A) => any ? A : never;

export type ExcludeQueryParams<T> = [P in keyof T]: T[P] extends PagingParameters ? never : T[P] 

Then i have this code to extract the types of the arguments for a function

function test(query: PagingParameters, as: number, f: string) 
 return 1;


type argTypes = ArgumentTypes<typeof test>
type result = ExcludeQueryParams<argTypes>

Above, argTypes will equal [PagingParameters, number, string]

What i am trying to do is extract the PagingParameters type from the array so result is [number, string], however using ExcludeQueryParams the result is [never, number, string].

How can achieve this properly without the final type array containing the never type?

typescript

share|improve this question

edited Mar 7 at 3:29

joeblow

asked Mar 7 at 2:51

joeblowjoeblow

162

 /** Types of a function's arguments */
export type ArgumentTypes<F extends Function> = F extends (...args: infer A) => any ? A : never;

export type ExcludeQueryParams<T> = [P in keyof T]: T[P] extends PagingParameters ? never : T[P] 

function test(query: PagingParameters, as: number, f: string) 
 return 1;


type argTypes = ArgumentTypes<typeof test>
type result = ExcludeQueryParams<argTypes>

share|improve this question

edited Mar 7 at 3:29

joeblow

asked Mar 7 at 2:51

joeblowjoeblow

162

share|improve this question

edited Mar 7 at 3:29

joeblow

asked Mar 7 at 2:51

joeblowjoeblow

162

asked Mar 7 at 2:51

joeblowjoeblow

162

asked Mar 7 at 2:51

joeblowjoeblow

162