Conditionally add metadata

gist.ts

const meta: IStringMap<string> = {};

// Conditionally add meta data if not null or undefined
if (Codes.transactionCategoryCodes[transaction.txnCatCde] != null) {
    meta.transactionType = Codes.transactionCategoryCodes[transaction.txnCatCde];
}

if (transaction.txnRefNum != null) {
    meta.bankTransactionId = transaction.txnRefNum;
}