slavafomin

import type { Context, Middleware } from 'grammy';

import type { MaybeArray } from '../types/maybe-array';

import { middlewareToFn } from './middleware-to-fn';


/**
 * Middleware tree execution result. Equals `true` when

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grammY Auto Answer Callback Query

The plugin allows to automatically answerCallbackQuery when the developer forgets or decides not to do so.

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AWS EC2 Dynamic DNS

Use the provided script to update your Route 53 domain name to point to the EC2 instance IP address that changes dynamically on reboot.

# configure crontab
sudo -i
chmod ug=rx,o= /root/update-dns.sh
systemctl enable cron.service
crontab -e

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GPG Encryption

List Keys

gpg --list-keys

Import Key

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The most optimal way to copy bytes in JavaScript (Uint8Array)

Please read my post in Telegram: Don't use spread operator with byte arrays

Short summary

1. Use target.set(source, offset) MDN
2. Pre-alocate the entire array once
3. Don't use ...spread operator with bytes

slavafomin

Using Jest with SWC, TypeScript, and ESM

Install dependencies

pnpm add -D jest @jest/globals @types/jest @swc/jest

Create jest.config.js file

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{
  "5.9.10.47:19949": {
    "errors": {
      "LITE_SERVER_UNKNOWN: timeout(during last block synchronization)": 2
    },
    "results": {}
  },
  "5.9.10.15:48014": {
    "errors": {
      "LITE_SERVER_NOTREADY: block is not applied": 38,

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/**
 * This module implements ECMAScript (stage-3) proposal:
 * Promise with resolvers:
 * https://github.com/tc39/proposal-promise-with-resolvers
 *
 * Copyright 2023 Slava Fomin II
 *
 * Permission is hereby granted, free of charge, to any
 * person obtaining a copy of this software and associated
 * documentation files (the “Software”), to deal in the

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const isValid$ = (
  merge(
    value$.pipe(
      distinctUntilChanged(),
      map(() => undefined),
    ),
    value$.pipe(
      debounceTime(500),
      withLatestFrom(isComplete$),
      filter(([_, isComplete]) => isComplete),

slavafomin

import { WebApp } from '@grammyjs/web-app';


export function isTwa(): boolean {

  return (
    Boolean(WebApp.initData) ||
    (WebApp.platform !== 'unknown')
  );