getify

// abstract class, not intended to be instantiated directly
class CalendarItem {
    static #UNSET = Symbol("unset")
    static #isUnset(v) {
        return v === this.#UNSET;
    }
    static {
        for (let [idx,msg] of [
            "ID is already set.",
            "ID is unset.",

getify

In defense of blocks for local scopes (Part 1)

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[EDIT: I've added a part 2 to this blog post, to address some of the feedback that has come up: https://gist.github.com/getify/706e5e10822a298375da40f9cc1fa295]

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Recently, this article on "The JavaScript Block Statement" came out, and it received some good discussion in a reddit thread. But the general reaction seems to be against this approach. That saddens me.

kpirliyev

PostgreSQL 13 Master-Standby Streaming Replication

PostgreSQL has various types of replication available and it could be a little bit confusing to figure out what has to be done to just configure a simple master-standby replicated database setup. Digging my way through documentation I decided to write my own little guide on how to setup simple replication in PostgreSQL 13.

How it works

Streaming replication works by streaming the contents of WAL (Write-Ahead Logging) file from one server to another. Each transaction is first written into the WAL file, so essentially every change on the primary server will be replicated on the standby server. Standby server could be used for read-only operations, but can't be written to. Ofcourse, transferring data over the network takes time and there is a small lag before data written to one server becomes available on the other. To guarrantee data consistency on both servers at the time of read operation we can enable synchronous replication mode. This way, datab

ErfanMirzapour

Tailwind CSS (@v2.0.2)

Table of Contents

• Core
  • Responsive Design
  • Pseudo-classes
  • Visually Hidden
• Units
• Properties

sindresorhus

Pure ESM package

The package that linked you here is now pure ESM. It cannot be require()'d from CommonJS.

This means you have the following choices:

1. Use ESM yourself. (preferred)
   Use import foo from 'foo' instead of const foo = require('foo') to import the package. You also need to put "type": "module" in your package.json and more. Follow the below guide.
2. If the package is used in an async context, you could use await import(…) from CommonJS instead of require(…).
3. Stay on the existing version of the package until you can move to ESM.

codingnninja

function preprocessImage(canvas) {
    const ctx = canvas.getContext('2d');
    const image = ctx.getImageData(0,0,canvas.width, canvas.height);
    blurARGB(image.data, canvas, 1);
    dilate(image.data, canvas);
    invertColors(image.data);
    thresholdFilter(image.data, 0.4);
    return image;
}

mstorus

async function cryptoSign(message) {
  const key = await window.crypto.subtle.generateKey(
    {
      name: "HMAC",
      hash: { name: "SHA-512" },
    },
    true,
    ["sign", "verify"]
  );
  const encodedText = new TextEncoder().encode(message);

MBrassey

Match Crypto Wallet Addresses using Regular Expressions

The following regular expressions are crafted to match some commonly used cryptocurrency wallet address types. This document details the Regex components and pattern tests to match Ethereum, Bitcoin, Dash and Monero addresses.

🌀 Click the images below to view the tested patterns.

Ethereum (ETH)

/^0x[a-fA-F0-9]{40}$/g

jengel3

// app/modules/authentication/authentication.controller.ts

import { Body, Controller, Post } from '@nestjs/common'

import { RegisterRequest } from './requests'

import { User } from '../../modules/user'

import { UsersService } from '../users/users.service'

eunsukimme

FROM node:12

WORKDIR /app

COPY ./package*.json ./
RUN npm install
ENV PORT=4000

COPY . .
CMD ["npm","run","start"]