It's a mono-repo library, not yet published to npm.
Install from npm/yarn
# npm npm install @harmony-js/core@next # yarn yarn add @harmony-js/core@next # tslib may be required, we'd better install it as well npm install tslib yarn add tslib
make sure you have latest
git clone email@example.com:FireStack-Lab/Harmony-sdk-core.git cd Harmony-sdk-core
cleanup and build
yarn global add lerna && yarn install && lerna bootstrap && lerna link && yarn dist