-Limits the number of files rollup will open in parallel when reading modules or writing chunks. Without a limit or with a high enough value, builds can fail with an "EMFILE: too many open files". This depends on how many open file handles the operating system allows. If you set the limit too low and use plugins that rely on the [`this.load`](../plugin-development/index.md#this-load) context function, such as the `commonjs` plugin, then it can happen that builds stall without an error message as it limits the number of parallel `load` calls.
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