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You are describing modifying someone else's unrelated code will cause the rebuild of your code right? This looks like your targets unintentionally depend on the

• notacoward 7y ago
  > This looks like your targets unintentionally depend on the other code. Sometimes it's unintentional, for example an include left in after it's no longer needed. Other times it's intentional but lazy. For example, I often see commits that pull in one dependency just to use one tiny little utility function, but that dependency pulls in ten others, which each pull in ten others, and before you know it any change in a hundred files forces yours to be recompiled even when that tiny utility function wasn't touched. A responsible developer would refactor the header file to keep the number of spurious rebuilds down, but the world is full of irresponsible developers. With multiple repos, the public immutable part of an API and the private fluid part tend to find their way into separate files pretty quickly. With a monorepo they don't, which is kind of ironic because one of the purported benefits of a monorepo is that it's easy to reach into "someone else's code" and refactor it. Unfortunately, people just don't seem to use that ability for good often enough unless review culture forces them to.