This allows go-to-definition to reach the original .ts files for
consumers of the package. It emits .d.ts.map files alongside the regular
.d.ts files
e.g. in sdk.createClient go-to-definition on createClient will place the
cursor at the function in src/matrix.ts rather than inside a definition
file lib/matrix.d.ts
Signed-off-by: Alex Macleod <alex@macleod.io>
1829 added the spec files to 'src', presumably because they just
were't type checked otherwise, but this chaqnged the implicit rootDir
so the lib directory we shipped has types in src/ and spec/ which
meant lib/index.d.ts was at lib/src/index.d.ts.
Specify the rootDir on the build tsconfig to put it back in the
right place, and also try to make the base tsconfig never emit
to avoid it ever generating .d.ts files in silly places. Move all
the optoins related to emitting to -build since they aren't relevant
in the main one.
Is this a sensible way to do this? It doesn't feel terribly elegant.
Fixes https://github.com/vector-im/element-web/issues/18503
Regressed in https://github.com/matrix-org/matrix-js-sdk/pull/1829
Michael Telatynski