Commits on Feb 6, 2022

1. Merge multi-source output sourcemaps …

   Surprisingly, Babel allows a transformer to mark the source file of
   a node to allow it to be sourced from any file. When this happens, the
   output sourcemap will contain multiple `sources`. I didn't realize this
   when I created babel#14209, and this `remapping` will throw an error if the
   output map has multiple sources.
   
   This can be fixed by using `remapping`'s graph building API (don't pass
   an array). This allows us to return an input map for _any_ source file,
   and we just need some special handling to figure out which source is our
   transformed file.
   
   This actually adds a new feature, allowing us to remap these
   multi-source outputs. Previously, the merging would silently fail and
   generate a blank (no `mappings`) sourcemap. That's not great. The new
   behavior will properly merge the maps, provided we can figure out which
   source is the transformed file (which should always work, I can't think
   of a case it wouldn't).
   
   Fixes ampproject/remapping#159.

   

   jridgewell committed Feb 6, 2022
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