scripts: Don’t make empty subfolders for ignored files in build folder

[pedrottimark]

Summary

I noticed empty build/__tests__ folder in the installed diff-sequences@23.2.0 package.

Although I didn’t find where that problem was fixed between 23.4.0 and 23.4.1, I did find change in assumption as reason for many empty subfolders in build folder.

Comment in scripts/build.js file:

Non-js or files matching IGNORE_PATTERN will be copied without transpiling.

For a long while, files in folders matching IGNORE_PATTERN are not copied, so buildFile function can return early before mkdirp call.

The diff after code is moved with a change takes a second look to understand what happened :(

Test plan

yarn build-clean and yarn build and yarn jest

after yarn build	baseline	improved
files	250	250
folders	189	56
__tests__ or __mocks__ folders or subfolders	133	0
empty folders	83	0

The improved number of folder 56 = 189 - 133

The baseline number of empty folders 83 < 133 because some intermediate level subfolder do contain subfolders (even though they don’t contain files)

Here are the commands for rows in preceding table:

• find packages/*/build -type f -print | wc
• find packages/*/build -type d -print | wc
• find packages/*/build -type d -print | grep -e __tests__ -e __mocks__ | wc
• find packages/*/build -type d -empty -print | wc

[codecov-io]

Codecov Report

Merging #7001 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7001   +/-   ##
=======================================
  Coverage   66.92%   66.92%           
=======================================
  Files         250      250           
  Lines       10405    10405           
  Branches        4        3    -1     
=======================================
  Hits         6964     6964           
  Misses       3440     3440           
  Partials        1        1

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[github-actions]

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