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Trying to understand what is output from build an Angular8 library (since it builds 5 similar looking things, the build time has gone up for each library) - What am I seeing when I build an angular library (bundle, esm5, esm2015, fesm5 and fesm2015)? Can I teach the Angular8 to only give me ESM5 or UMD modules for my libraries and not spend extra time generating these unwanted "modern browser" stuff?
I read a bit about differential loading but does not seem to make sense from the point of view of building Angular8 libraries.
Any pointers are appreciated.
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fesm5 - flattened version of esm5. fesm2015 - flattened version of peerDependencies esm2015. lib - TypeScript definitions for the library.
The shortened name “FESM” (pronounced “phesom”) can have a number after it such as “FESM5” or “FESM2015”. The number refers to the language level of the JavaScript inside the module. So a FESM5 file would be ESM+ES5 (import/export statements and ES5 source code).
An Angular library is an Angular project that differs from an application in that it cannot run on its own. A library must be imported and used in an application. Libraries extend Angular's base features.
Have a look at https://docs.google.com/document/d/1CZC2rcpxffTDfRDs6p1cfbmKNLA6x5O-NtkJglDaBVs/preview (chapter "Compilation and transpilation"). Hope that helps!
Found the link in this blog post, which is s nice introduction: http://willtaylor.blog/complete-guide-to-angular-libraries/
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