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process: add lineLength to source-map-cache - #29863
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bcoe
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Oct 6, 2019
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I pulled prepare_stack_trace.js into its own file, because it seemed like it wasn't directly related to the source map caching functionality (and source_map_cache.js was starting to get a bit confusing).
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It's getting to the point where we write quite a bit of data to disk (and memory) -- we don't actually need the url field, if we've successfully parsed the map, so let's avoid storing it.
devsnek
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i can't really comment on the changes to the source map logic but everything else looks ok
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nodejs-github-bot
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Oct 7, 2019
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targos
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bcoe
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Oct 11, 2019
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@targos I believe I've addressed your comments, mind giving this a final look? |
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added 4 commits
October 11, 2019 16:24
Without the line lengths of in-memory transpiled source, it's not possible to convert from byte ofsets to line/column offsets.
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Oct 12, 2019
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Oct 14, 2019
Without the line lengths of in-memory transpiled source, it's not possible to convert from byte ofsets to line/column offsets. PR-URL: #29863 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: David Carlier <devnexen@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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Without the line lengths of in-memory transpiled source, it's not possible to convert from byte ofsets to line/column offsets. PR-URL: #29863 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: David Carlier <devnexen@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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Nov 10, 2019
Without the line lengths of in-memory transpiled source, it's not possible to convert from byte ofsets to line/column offsets. PR-URL: #29863 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: David Carlier <devnexen@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passesProblem
I realized when integrating source-map functionality with coverage that we're missing a piece of information necessary to support tools like ts-node:
require.extensions) we lack enough information to translate from bytes to lines/columns.we end up with a bad reports that look like this, due to missing information:
👆 note that exactly the wrong code is highlighted 😆
Solution
If we track the line lengths of the source file that source maps were extracted from, this provides enough information to remap from byte offset to line/column offset.
I've introduced an additional value into the cache,
lineLengths, to facilitate this.we can now generate the following report: