TypeError [ERR_INVALID_ARG_TYPE] about hdkey HOT 3 CLOSED

You're passing a promise into hdkey.fromMasterSeed; you need get the actual resolved Buffer to pass in.

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For how long should I wait until it resolves? I also tried

const seed = await bip39.mnemonicToSeed(mnemonic);

but it said that mnemonicToSeed is not an async function, which is weird.

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Use mnemonicToSeedSync

await needs to be used INSIDE an async function foo() { ... } type of function... the only time JS runtime error will say anything about "async" is when you try to await outside of an async function.

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