Tree shaking: are unused functions included to a bundle?











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Do modern bundlers like Webpack or Rollup shake out only unused modules or are they capable of removing unused functions (or variables, classes) inside a module as well?



// src.js

export function unused() {}

export function used() {} 



// bundle.js

// function unused() {}  // <-- will this be included?

function used() {}


Searched on the subject but found nothing.



P.S. I've no experience with bundlers (other than zero-config Parcel) but I make the library that requires the answer to this question.






javascript webpack rollupjs parceljs tree-shaking







share|improve this question




























    up vote
    2
    down vote

    favorite












    Do modern bundlers like Webpack or Rollup shake out only unused modules or are they capable of removing unused functions (or variables, classes) inside a module as well?



    // src.js
    
export function unused() {}
    
export function used() {} 
    

    
// bundle.js
    
// function unused() {}  // <-- will this be included?
    
function used() {}


    Searched on the subject but found nothing.



    P.S. I've no experience with bundlers (other than zero-config Parcel) but I make the library that requires the answer to this question.






    javascript webpack rollupjs parceljs tree-shaking







    share|improve this question


























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      Do modern bundlers like Webpack or Rollup shake out only unused modules or are they capable of removing unused functions (or variables, classes) inside a module as well?



      // src.js
      
export function unused() {}
      
export function used() {} 
      

      
// bundle.js
      
// function unused() {}  // <-- will this be included?
      
function used() {}


      Searched on the subject but found nothing.



      P.S. I've no experience with bundlers (other than zero-config Parcel) but I make the library that requires the answer to this question.






      javascript webpack rollupjs parceljs tree-shaking







      share|improve this question















      Do modern bundlers like Webpack or Rollup shake out only unused modules or are they capable of removing unused functions (or variables, classes) inside a module as well?



      // src.js
      
export function unused() {}
      
export function used() {} 
      

      
// bundle.js
      
// function unused() {}  // <-- will this be included?
      
function used() {}


      Searched on the subject but found nothing.



      P.S. I've no experience with bundlers (other than zero-config Parcel) but I make the library that requires the answer to this question.






      javascript webpack rollupjs parceljs tree-shaking




      javascript webpack rollupjs parceljs tree-shaking






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited yesterday









      James A Mohler

      6,994123252




      6,994123252










      asked Nov 8 at 0:14









      Nurbol Alpysbayev

      2,1801220




      2,1801220
























          1 Answer
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          Turns out I've searched not well enough.



          Here: https://medium.com/@netxm/what-is-tree-shaking-de7c6be5cadd
          the author says that unused functions won't be included.






          share|improve this answer





















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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

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            active

            oldest

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            up vote
            1
            down vote



            accepted










            Turns out I've searched not well enough.



            Here: https://medium.com/@netxm/what-is-tree-shaking-de7c6be5cadd
            the author says that unused functions won't be included.






            share|improve this answer

























              up vote
              1
              down vote



              accepted










              Turns out I've searched not well enough.



              Here: https://medium.com/@netxm/what-is-tree-shaking-de7c6be5cadd
              the author says that unused functions won't be included.






              share|improve this answer























                up vote
                1
                down vote



                accepted







                up vote
                1
                down vote



                accepted






                Turns out I've searched not well enough.



                Here: https://medium.com/@netxm/what-is-tree-shaking-de7c6be5cadd
                the author says that unused functions won't be included.






                share|improve this answer












                Turns out I've searched not well enough.



                Here: https://medium.com/@netxm/what-is-tree-shaking-de7c6be5cadd
                the author says that unused functions won't be included.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 8 at 0:25









                Nurbol Alpysbayev

                2,1801220




                2,1801220






























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