I like the way is configured, in my case the configuration is very compact and I don't have to disable undesirable default behavior. The one plugin I had also got considerably simpler, no tricks necessary to make Rollup render a file in memory.
In the process I migrated the remaining parts of the codebase to ES6 modules, something that was non-trivial due to unit tests running on #NodeJS (meaning: no native module support). The other (unexpected) complication were circular dependencies.
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