• Rollup Version: 1.4.1
• Operating System (or Browser): Linux
• Node Version: 10.10.0

How Do We Reproduce?

Follow the steps on https://github.com/isidrok/rollup-hashing-bug

Expected Behavior

When code changes in a plugin hook, the file hash should be updated to match the new content.

Actual Behavior

The file hash is not updated with the new content, instead keeps the hash of the original one which can lead to incorrect hashes when modifying the build process but not the source or when some plugin in the build process modifies the source due to external factors.

Note that renaming chunkInfo.fileName from within the plugin will not work since dependent chunks will keep referencing the old fileName.

Let me know if you could use some help for a PR!