Make line counts reflect all line endings #691
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This is fantastic @danielsmc - sorry about the late review.
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Summary
Metro included a few functions to count source lines, some of which didn't correctly count all line terminators specified in the ECMAScript standard. This PR replaces those implementations with the correct one found in
packages/metro/src/shared/output/RamBundle/util.js.The user-facing issue which led me to this was that importing a file with CRLF line endings caused
/symbolicateto return incorrect mappings for all files after that one in the bundle. Metro-transform-worker was double-counting the line endings and getExplodedSourceMap was carrying that erroneous offset through.Test plan
There's a new test for a variety of line endings, and the several existing tests that exercise countLines pass without modification.