anttispitkanen

declare const longApiCallThatTakesUpTo30seconds: () => Promise<any>
declare const sendEmailToCustomer: () => Promise<any>
declare const logSuccess: () => Promise<any>

/**
 * A silly example of moving money from one account to another. The basic use
 * case with no problems.
 */
export const myTransactionalDatabaseOperation = () => {
  return knex.transaction(async (trx) => {

anttispitkanen

🇺🇦 Support Ukraine HTML link banners 🇺🇦

Ukraine needs all the help we can give in fighting the Russian dictator Vladimir Putin's war. See information and resources on trusted news sources, also a short summary here: https://github.com/anttispitkanen

As someone building or maintaining a website of any kind, a simple way to help is to add a banner to show support, raise awareness, and guide visitors towards actionable help.

Here are some ready made HTML tags that you can freely use, modify according to your desire, and drop on your site. They act as a clickable banner that links to the resource of your choice.

Customizing the look

anttispitkanen

import { pipeline, Readable, Transform, Writable } from "stream";

const makeFilter = <A>(filterFn: (x: A) => boolean) => {
  return new Transform({
    objectMode: true,
    transform: (data: A, _, done) => {
      try {
        const willPass = filterFn(data);
        return done(null, willPass ? data : null);
      } catch (ex) {

anttispitkanen

const CANARY_THRESHOLD_PERCENT = parseInt(
  process.env.CANARY_THRESHOLD_PERCENT || '0',
);

/**
 * This function divides the traffic between Old Data API and New Data API
 * based on the runtime configuration of CANARY_THRESHOLD_PERCENT.
 */
export const handleDataRequestWithCanaryTraffic = (
  requestId: string,

anttispitkanen

const SHADOW_TRAFFIC_ENABLED = process.env.SHADOW_TRAFFIC_ENABLED === 'true';

/**
 * This function includes the shadow traffic "side channel" in addition to
 * the "main channel".
 */
export const handleDataRequestWithShadowTraffic = (
  requestId: string,
  animal: TAnimal,
): Promise<TDataApiData> => {

anttispitkanen

export const handleDataRequest = (requestId: string, animal: TAnimal): Promise<TDataApiData> => 
  dataApiClient.getData(requestId, animal);

anttispitkanen

const waitAndReturn = (ms, msg) =>
  new Promise(resolve => {
    setTimeout(() => {
      resolve(msg);
    }, ms);
  });

const foo = () => {
  waitAndReturn(5000, 'First').then(msg => console.log(msg));

anttispitkanen

import React, { Component } from "react";
import "./App.css";

const names = [
  "Repe",
  "Pera",
  "Kartsa",
  "Raipe",
  "Simo",
  "Jussi",