Improve `FileSystemTransport` by using `compute()` #57

Job	Run time
cancel-previous-workflow	5s
android \| ubuntu-latest \| stable	1m 8s
android \| ubuntu-latest \| beta	1m 5s
linux \| ubuntu-latest \| stable	1m 44s
linux \| ubuntu-latest \| beta	1m 28s
ios \| macos-latest \| stable	2m 17s
macos \| macos-latest \| stable	1m 48s
windows \| windows-latest \| stable	2m 39s
windows \| windows-latest \| beta	2m 38s
analyze / analyze	1m 50s
analyze / cancel-previous-workflow	4s
analyze / package-analysis	57s
	17m 43s

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