Dependency Problem with @harmony-js/core

[rac-sri]

On importing TruffleProvider from @harmony-js/core and :

const newAcc = truffleProvider.addByPrivateKey(process.env.TESTNET_PRIVATE_KEY);

generates the following error:

To reproduce:

• Use any project using @harmony-js/core
• Remove node_modules
• Reinstall node_modules
• Rerun your project.

Note: The private key in the picture is from Ganache Testing. But the same error is occurring for different networks with original keys.