using .env with typesript

[EazyReal]

I would like to write let deployer = new Wallet(process.env.DEPLOYER_PRIVATE_KEY);.
However, this causes a type issue since DEPLOYER_PRIVATE_KEY is not of valid input type.
Can the documentation point out how to transfer between different types?

[ricmoo]

Do NOT paste a private key in this issue or send a private key to anyone by e-mail, but what is the type of DEPLOYER_PRIVATE_KEY?

The private key should be be a hexstring with 32 bytes of data (64 nibbles) with a 0x Prefix; see the docs for more info.

[cpecorari]

@EazyReal I think your main issue with Typescript is that process.env.WHATEVER can be undefined so Typescript complains on var being possibly undefined, and Ethers needs some string. (see https://docs.ethers.io/v5/api/signer/#Wallet-constructor)
So you could type check before Wallet constructor :

if(!process.env.DEPLOYER_PRIVATE_KEY || process.env.DEPLOYER_PRIVATE_KEY.substring(0, 2) !== '0x')
  throw new Error('Need private key string !');

[EazyReal]

@EazyReal I think your main issue with Typescript is that process.env.WHATEVER can be undefined so Typescript complains on var being possibly undefined, and Ethers needs some string. (see https://docs.ethers.io/v5/api/signer/#Wallet-constructor) So you could type check before Wallet constructor :

if(!process.env.DEPLOYER_PRIVATE_KEY || process.env.DEPLOYER_PRIVATE_KEY.substring(0, 2) !== '0x')
  throw new Error('Need private key string !');

Thanks, I solved it with the ! operator
let deployer = new Wallet(process.env.DEPLOYER_PRIVATE_KEY!);