List<VirtualFile> (@NotNull Sdk sdk, @NotNull List<VirtualFile> sdkRoots, @NotNull List<VirtualFile> userAddedRoots) { return ImmutableList.<VirtualFile>builder() .addAll(sdkRoots) .addAll(getSkeletonsPaths(sdk)) .addAll(userAddedRoots) .addAll(PyTypeShed.INSTANCE.findRootsForSdk(sdk)) .build(); }