Enhance sourceMapIncludeSources option#4170
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I'd like to deprecate passing true and false to sourceMapIncludeSources, which means this needs to be a full proposal document with an open comment period.
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This also needs to include the proposal's changes for importer.d.ts.md.
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sass/dart-sass#2712
This PR add new supported values for
sourceMapIncludeSources:'auto'- same asundefined'always'- same astrue'never'- same asfalseThe old boolean values
trueandfalseare deprecated and will be removed.