Subkey-mnemonic.js

import Keyring from '@polkadot/keyring';

public mnemonicGenerate(): void {
  this.mnemonicGenerated = mnemonicGenerate();
  this.keyring = new Keyring();
}

public validateMnemonic(): void {
  this.isValidMnemonic = mnemonicValidate(this.mnemonicGenerated);
}

public mainGenerateFromMnemonic(): void {
  this.validateMnemonic();
  if (this.isValidMnemonic) {
    this.meta = {
      name: this.keyAccountName,
      tags: this.accountTags.split(','),
      whenCreated: Date.now() };
    const pairAlice = this.keyring.addFromMnemonic(this.mnemonicGenerated,
      this.meta, this.keyringPairType);
    this.keyringPairAddress = this.keyring.getPair(pairAlice.address).address;
    this.keyringPairPubKey = u8aToHex(this.keyring.getPair(pairAlice.address).publicKey);
    this.currentPair = this.keyring.getPair(pairAlice.address);
  }
}