Incorrect cache hit if input is output of dependent target

[ethantkoenig]

Current Behavior

If

• task Y depends on task X, and
• task Y has caching enabled, and
• file F is the input of task Y and the output of task X

then the cache key for task Y appears to be computed using the contents of F prior to task X running, which can result in an incorrect cache hit if task X changes the contents of F.

Expected Behavior

The cache key for task Y should be computed using the contents of F after task X completes.

GitHub Repo

https://github.com/ethantkoenig/nx-cache-bug

Steps to Reproduce

1. Run nx run foo:b2c a few times, until you see that the b2c task is hitting the cache.
2. Change the contents of foo/a.
3. Rerun nx run foo:b2c, and note that the b2c task is still hitting the cache, and that while foo/b has been updated to match the new contents of foo/b, foo/c still has its original contents.

Nx Report

NX   Report complete - copy this into the issue template

Node           : 21.7.1
OS             : darwin-arm64
Native Target  : aarch64-macos
npm            : 10.5.0

nx (global)        : 19.6.5
nx                 : 19.7.3
@nx/js             : 19.7.3
@nx/linter         : 19.7.3
@nx/eslint         : 19.7.3
@nx/workspace      : 19.7.3
@nx/devkit         : 19.7.3
@nx/eslint-plugin  : 19.7.3
@nrwl/tao          : 19.7.3
typescript         : 5.5.4
---------------------------------------
Registered Plugins:
@nx/eslint/plugin

Failure Logs

No response

Package Manager Version

No response

Operating System

• macOS
• Linux
• Windows
• Other (Please specify)

Additional Information

No response