Pete Bacon Darwin ad0fb9c6bb fix(ngcc): copy (and update) source-maps for unmodified source files (#40429)
When using the `NewEntryPointWriter` we copy unmodified files over to the new
entry-point in addition to writing out the source files that are processed by ngcc.
But we were not copying over associated source-map files for these unmodified
source files, leading to warnings in downstream tooling.

Now we will also copy over source-maps that reside as siblings of unmodified
source files. We have to make sure that the sources of the source-map point
to the correct files, so we also update the `sourceRoot` property of the copied
source-map.

Fixes #40358

PR Close #40429
2021-01-14 11:30:39 -08:00
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