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Get the current account or set it if there is no current account
/** Get the current account */
public currentAccount(): Observable<string | Error> {
if (this.web3.eth.defaultAccount) {
return of(this.web3.eth.defaultAccount);
} else {
return this.getAccounts().pipe(
tap((accounts: string[]) => {
if (accounts.length === 0) { throw new Error('No accounts available'); }
map((accounts: string[]) => accounts[0]),
tap((account: string) => this.web3.eth.defaultAccount = account),
catchError((err: Error) => of(err))
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