Initialize the required variables in the scripts right before running each of them.
yarn
The first script can be used to generate the mnemonic for a vanity address.
You can specify a prefix, suffix and if they are caseSensitive or not.
yarn play generate-vanity-address-mnemonic
Given a mnemonic and a password, the second script can encrypt the wallet and return an encrypted JSON file.
yarn play encrypt-wallet
Given an encryptedWalletJson and the password that was used to encrypt it, the third script can decrypt the wallet and return the mnemonic, private key and some other data.
yarn play decrypt-wallet