read static method
Null when there is nothing to read, the file is unreadable, or it was
written by a version this build does not know — all of which mean the
same thing to a panel, and none of which is worth an error.
The report for the export at outputDirectory — the root the tree was
written to, the one holding ios/ and android/.
Implementation
static StoreShotsReport? read(String outputDirectory) =>
readFile(File(p.join(outputDirectory, directory, fileName)));