This doc is still under development

all strategy uses version passed to options as a cache tag. When version changes, old version cache is removed and new files are downloaded. Of course if files with the same name were not changed (HTTP status 304), the browser probably won't download them again and will just update cache.
changed strategy is more advanced than all. offline-plugin will calculate the files' hashes on it's own, independant of webpacks hash calculation. Even if a file is renamed, if the hash is the same, it will not be downloaded again, but rather just renamed. With this strategy enabled, index.html (or other files without dynamic name) should be placed in main section of the cache, otherwise they won't be revalidated.
- For ServiceWorker this means that only new/changed files will be downloaded and missing files deleted from the cache.
- AppCache does not support the changed strategy and will always use the all strategy.
updateStrategy does not apply to externals, as they're always revalidated/redownloaded on ServiceWorker update.

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