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feat: Fix excludeAfterRemap functionality. #1010

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merged 3 commits into from Mar 7, 2019

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coreyfarrell
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I'm not sure if this qualifies as a feature or a fix, filtering after remapping has never worked. Original implementation of filtering remapped sources at dd40dc5, addition of excludeAfterRemap option at cdfdff3. Unfortunately the filtering step was done before coverage was remapped using source-maps, so it didn't do anything.

This is a potentially breaking change - bundled / compiled code was never filtered based on the original source filename, after this it will be. As an auxiliary change test-exclude options are also added to the nyc report and nyc check-coverage as those commands should process exclude-after-remap.

Fixes #956

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coveralls commented Mar 6, 2019

Coverage Status

Coverage decreased (-0.3%) to 93.701% when pulling 220f77d on coreyfarrell:exclude-after-remap into e501d86 on istanbuljs:master.

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bcoe commented Mar 6, 2019

@coreyfarrell see my comments here; do we just bite the bullet and move away from the --exclude-after-remap command; perhaps it would give us more flexibility for a variety of configurations if we broke this out into its own configuration setting?

Previously excludeAfterRemap caused filtering to happen before remapping
to original source filenames.  This caused the filtering to be
completely ineffective.  Fix the order, add a test to verify
functionality.
@coreyfarrell coreyfarrell merged commit 0fc217e into istanbuljs:master Mar 7, 2019
@coreyfarrell coreyfarrell deleted the exclude-after-remap branch March 7, 2019 22:05
})
.option('include', {
alias: 'n',
default: [],
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@coreyfarrell sorry for the post-review - shouldn't this be ['**']?

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Nope. An empty list is functionally equal to ['**'] but [] actually bypasses the check so it's more efficient.

https://github.com/istanbuljs/istanbuljs/blob/master/packages/test-exclude/index.js#L50-L54 is where the default is processed, [] is replaced with false which short-circuits the include check.

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How to ignore coverage data (instrumented code) from dependencies?
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