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This commit adds a new subcommand called "coverage"
which can generate code coverage reports to stdout in
multiple formats from code coverage profiles collected to disk.
Currently this supports outputting a pretty printed diff and
the lcov format for interoperability with third-party services and tools.
Code coverage is still collected via other subcommands
that run and collect code coverage such as
"deno test --coverage=<directory>" but that command no
longer prints a pretty printed report at the end of a test
run with coverage collection enabled.
The restrictions on which files that can be reported on has
also been relaxed and are fully controllable with the include
and exclude regular expression flags on the coverage subcommand.
Co-authored-by: Luca Casonato <lucacasonato@yahoo.com>
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This commits makes use of source maps and the original source
when printing lacking line coverage in the pretty printer.
Only the executable lines are checked as before (as non-executable
lines will always be ignored anyways). The lines then mapped to the
appropriate source line when a source map is present.
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Merging multiple runs isn't quite right because we
rely on a 0 count to signal that a block hasn't been called.
Other tools like c8 expect this to be true as-well so we
need to do our best to merge coverage files rather
than duplicating them.
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