• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

Mainly required for Qt where brew deps --tree on Linux is slow when using split out modules (Homebrew/homebrew-core#246844). When saved in a file it is over 8GB, which causes OOM on GitHub runner and seems to take hours on self-hosted (locally takes ~30min when dumping to a file)

I think we run this in CI to catch circular dependencies, so can ignore already tested parts.

I've also seen CI runner spend 5+ minutes on brew deps --tree for other formulae so may help speed those up too.

Later on, may see if there is any performance issue of brew deps --tree or expected when storing in memory.

For qtwebengine output tree size comparison

❯ brew deps --tree --include-build --include-test --os linux qtwebengine | wc -c
 616702319

❯ brew deps --tree --prune --include-build --include-test --os linux qtwebengine | wc -c
   71937

qtdeclarative time comparison (easier to test than qtwebengine)

❯ hyperfine "brew deps --tree --include-build --include-test --os linux --prune qtdeclarative" "brew deps --tree --include-build --include-test --os linux qtdeclarative"
Benchmark 1: brew deps --tree --include-build --include-test --os linux --prune qtdeclarative
  Time (mean ± σ):      1.052 s ±  0.139 s    [User: 0.742 s, System: 0.109 s]
  Range (min … max):    0.948 s …  1.374 s    10 runs

Benchmark 2: brew deps --tree --include-build --include-test --os linux qtdeclarative
  Time (mean ± σ):     21.471 s ±  0.202 s    [User: 20.911 s, System: 0.276 s]
  Range (min … max):   21.178 s … 21.822 s    10 runs

Summary
  brew deps --tree --include-build --include-test --os linux --prune qtdeclarative ran
   20.40 ± 2.71 times faster than brew deps --tree --include-build --include-test --os linux qtdeclarative