It really depends on the library. Some libraries are small but poorly written and some are brilliantly well thought out.
For better or for worse, code size is one of the easiest metric to measure, and typically the first thing that will be targeted when a niche reaches a certain level of saturation.
In Javascript in particular, the micro trend is largely a pushback against major frameworks' tendency to be bloated (Angular, Ember and even React - given its scope)
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It really depends on the library. Some libraries are small but poorly written and some are brilliantly well thought out.
For better or for worse, code size is one of the easiest metric to measure, and typically the first thing that will be targeted when a niche reaches a certain level of saturation.
In Javascript in particular, the micro trend is largely a pushback against major frameworks' tendency to be bloated (Angular, Ember and even React - given its scope)