Use LMDB cache instead of regular FS cache to speed up cache hits #932
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Please check if the PR fulfills these requirements
What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Improved performance of babel-loader when files are cached. LMDB is much faster to access than the regular file cache used by babel-loader.
In the large codebase I work with, warm boot times on webpack 4 improved from — 79 seconds to 74 seconds.
What is the current behavior? (You can also link to an open issue here)
babel-loadersaves files for caching built contents.What is the new behavior?
Replaces the use of individual files with lmdb, which improves babel-loader times, when hitting caches in large projects.
LMDB is already used by projects such as Parcel and Elasticsearch's Kibana, as the storage layer for HarperDB and Gatsby for fast memory-mapped cached access.
This has a side-effect of making babel-loader's implementation a bit simpler as well.
Does this PR introduce a breaking change?
Provided Change minimum supported node to 12 #933 is merged first.