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import 'abortcontroller-polyfill';
import ConnectionAbstract from 'elasticsearch/src/lib/connection';

/**
 * @example
 * const client = new elasticsearch.Client({
 *   connectionClass: FetchConnector
 * });
 */
class FetchConnector extends ConnectionAbstract {

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// Assuming https://github.com/jakearchibald/idb-keyval has been used for key-value entries,
// the following is about the minimum code needed to read the value for a single key (w/o the lib.)
// Usage: `readKey('name').then(function(name) { console.log(name); });`

function readKey(key) {
    var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;
    if (!indexedDB) return Promise.reject(new Error('IndexedDB not available'));
    return new Promise(function(resolve, reject) {
        var open = indexedDB.open('keyval-store', 1);
    

tobiashm

Example for setting up <whatever>.docker as a local domain (for Docker services)

What to do:

• Install dnsmasq for resolving hostnames
• Configure dnsmasq to resolve .docker requests to localhost
• Configure macOS to send .docker requests to dnsmasq

brew install dnsmasq
# Create config files

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Use PhantomJS to render PDF in Rails

Avoid disk IO

If you're deploying your app to somewhere where you can't be sure to have reliable disk read/write access, the normal strategy of writing to a temp-file doesn't work. Instead we can open a pipe to the Phantom.js process, and then pass in the HTML via stdin, and then have the rasterize.js script write out the resulting PDF to stdout, which we can then capture. Any log messages from the Phantom.js process can be passed via stderr if we want.

Session heist

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#!/usr/bin/env bash

# Requirements:
# brew install jq node
# nvm use system; npm -g install semver

if [ -f package.json ]; then
  requested_node_version=$(jq -r '.engines.node' package.json)
  if [ "$requested_node_version" != "" ]; then
    node_version=$(nvm_ls | xargs env NODE_VERSION=system ~/.nvm/nvm-exec semver -r "$requested_node_version")

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@keyframes radar {
	0% { transform: rotate(0deg); }
	100% { transform: rotate(360deg); }
}
#wifi {
	width: 100px; height: 100px;
 	border: double 100px;
 	border-radius: 200px;
 	border-color: black transparent transparent;
 	animation: radar 3s linear infinite;

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Setup User Namespace on RHEL7 for use with Docker

Install Docker

Enable User Namespace on RHEL7:

# Notice: Use whatever is the lates version of `/boot/vmlinuz-xxx.el7.x86_64`
sudo grubby --args="user_namespace.enable=1" --update-kernel=/boot/vmlinuz-3.10.0-327.13.1.el7.x86_64
sudo reboot now

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# When you implement `method_missing` you should also implement `respond_to_missing?`
# But the later doesn't show up as instance methods on the class, and can not be called directly! Or does it???

class Foo
  def method_missing(name, *)
    "called #{name}"
  end

  def bar?
    respond_to_missing?(:bar)

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Use Karma.js with Ruby on Rails (Sprockets)

Inspired by http://monterail.com/blog/2014/karma-on-rails/

This basically allows you to reference your application JS files, which are generated by Sprockets, in the Karma config like this:

files: [
  '<%= require("application.js") %>',
  '<%= require("other.js") %>',

'static/files/**/*.js'

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module Kernel
  def Boolean(input)
    case input
    when true, /^(true|y|yes|1)$/i, 1
      true
    when false, /^(false|n|no|0)$/i, 0, "", nil
      false
    else
      fail TypeError, "can't convert #{input.inspect} into boolean"
    end