FAQ: Browser Compatibility and Transpilation - Build


This community-built FAQ covers the “Build” exercise from the lesson “Browser Compatibility and Transpilation”.

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This exercise can be found in the following Codecademy content:

Introduction To JavaScript

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In the Browser compatibility and transpilation lesson, part 10: build, after I’ve done everything is the code supposed to switch from ES6 to ES5 because I kinda got the impression that’s what was going to happen, but nothing happened…

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The ES5 code should appear in a new main.js file within a new folder lib. I’m reporting a bug that npm run build did not create lib or main.js.


Yep, no lib folder for me, either.


run ls in terminal window and lib will show up in the folder window


type in : nbm run build


Do we need to do anything with the HTML of the website to take advantage of the 2 different code lines? Is there something that we need to include in the header?