Improve `FileSystemTransport` by using `compute()` #56

Job	Run time
cancel-previous-workflow	3s
android \| ubuntu-latest \| stable	1m 13s
android \| ubuntu-latest \| beta	1m 13s
linux \| ubuntu-latest \| stable	1m 39s
linux \| ubuntu-latest \| beta	1m 30s
ios \| macos-latest \| stable	1m 59s
macos \| macos-latest \| stable	2m 0s
windows \| windows-latest \| stable	1m 53s
windows \| windows-latest \| beta	1m 49s
analyze / cancel-previous-workflow	2s
analyze / analyze	1m 30s
analyze / package-analysis	56s
	15m 47s

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