export async function getPrivateKeyFromMnemonic()

in src/commands/TruffleCommands.ts [188:231]
40 lines of code
4 McCabe index (conditional complexity)

  export async function getPrivateKeyFromMnemonic(): Promise<void> {
    Telemetry.sendEvent('TruffleCommands.getPrivateKeyFromMnemonic.commandStarted');
    const mnemonicItems: IExtendedQuickPickItem[] = MnemonicRepository
      .getExistedMnemonicPaths()
      .map((mnemonicPath) => {
        const savedMnemonic = MnemonicRepository.getMnemonic(mnemonicPath);
        return {
          detail: mnemonicPath,
          extended: savedMnemonic,
          label: MnemonicRepository.MaskMnemonic(savedMnemonic),
        };
      });

    if (mnemonicItems.length === 0) {
      Telemetry.sendEvent('TruffleCommands.getPrivateKeyFromMnemonic.thereAreNoMnemonics');
      window.showErrorMessage(Constants.errorMessageStrings.ThereAreNoMnemonics);
      return;
    }

    const mnemonicItem = await showQuickPick(
      mnemonicItems,
      { placeHolder: Constants.placeholders.selectMnemonicExtractKey, ignoreFocusOut: true },
    );

    const mnemonic = mnemonicItem.extended;
    if (!mnemonic) {
      Telemetry.sendEvent('TruffleCommands.getPrivateKeyFromMnemonic.mnemonicFileHaveNoText');
      window.showErrorMessage(Constants.errorMessageStrings.MnemonicFileHaveNoText);
      return;
    }

    try {
      const buffer = await bip39.mnemonicToSeed(mnemonic);
      const key = hdkey.fromMasterSeed(buffer);
      const childKey = key.derive('m/44\'/60\'/0\'/0/0');
      const privateKey = childKey.privateKey.toString('hex');
      await vscodeEnvironment.writeToClipboard(privateKey);
      window.showInformationMessage(Constants.informationMessage.privateKeyWasCopiedToClipboard);
    } catch (error) {
      Telemetry.sendException(error);
      window.showErrorMessage(Constants.errorMessageStrings.InvalidMnemonic);
    }
    Telemetry.sendEvent('TruffleCommands.getPrivateKeyFromMnemonic.commandFinished');
  }