Typscript 3.7 throws some errors when compiling Vega-lite 2 and 3, so we turn off lib checks.

This was investigated much more deeply in jupyterlab#7428, where we deleted the vega 4 extension and upgraded the vega 5 extension to vega-lite 4.0b11. The vega-lite upgrade was not going smoothly, so we moved it to a separate issue and redid the Typescript upgrade by just using the skipLibCheck flag.

This does not build coreutils docs because it complains about the .json file that is imported. This is probably a typescript or a typedoc bug.

For some reason, typescript itself works fine, but typedoc has this error:

 File ‘[snip]/jupyterlab/packages/coreutils/src/plugin-schema.json' is not listed within the file list of project ''. Projects must list all files or use an 'include' pattern.

This avoids this issue somehow by setting composite to false for typedoc doc builds.