Source package was generated as follows:

# VERSION=r154
# cd /tmp
# tar xvf three.js-${VERSION}.tar.gz
# mkdir -p three.js-${VERSION}-sources/examples/jsm
# mkdir -p three.js-${VERSION}-sources/editor/js/libs
# cp -r three.js-${VERSION}/src three.js-${VERSION}-sources
# cp -r three.js-${VERSION}/utils three.js-${VERSION}-sources
# cp -r three.js-${VERSION}/examples/jsm/controls three.js-${VERSION}-sources/examples/jsm
# cp -r three.js-${VERSION}/examples/jsm/loaders three.js-${VERSION}-sources/examples/jsm
# cp three.js-${VERSION}/* three.js-${VERSION}-sources/
# cp three.js-${VERSION}/editor/js/libs/es-module-shims.js three.js-${VERSION}-sources/editor/js/libs
# tar cvf three.js-${VERSION}-sources.tar.gz three.js-${VERSION}-sources