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fix(rome_js_analyze): improve trivia handling in useSingleVarDeclarator #2955
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Parser conformance results on ubuntu-latestjs/262
jsx/babel
symbols/microsoft
ts/babel
ts/microsoft
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ematipico
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Jul 29, 2022
crates/rome_js_analyze/src/analyzers/js/use_single_var_declarator.rs
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…or (rome#2955) * fix(rome_js_analyze): improve trivia handling in useSingleVarDeclarator * update documentation * PR review
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Summary
This PR fixes #2945 by improving how trivia is handled as tokens are moved in the syntax tree mutation. Since that rule isn't really safe to apply I've downgraded its applicability to
MaybeIncorrect, and modified the CLI tests that were relying on thisI also fixed the issue of separated lists created with the node factory API having an empty slot at the end of the list if the trailing separator was
Noneby having the factory function take two iterators (one for the list elements and one for the separators) instead of a single iterator of pairs of list element + an optional separator token. The content of the two iterators are interleaved while building the list, and the separator iterator can simply be one item shorter than the elements iterator in order to omit the last separator without creating an empty slotTest Plan
I've added the problematic cases from #2945 to the tests for the
useSingleVarDeclaratorrule, the code actions being emitted for these are now correct