Yves M. yvele

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Not all random values are created equal - for security-related code, you need a specific kind of random value.

A summary of this article, if you don't want to read the entire thing:

Don't use Math.random(). There are extremely few cases where Math.random() is the right answer. Don't use it, unless you've read this entire article, and determined that it's necessary for your case.
Don't use crypto.getRandomBytes directly. While it's a CSPRNG, it's easy to bias the result when 'transforming' it, such that the output becomes more predictable.
If you want to generate random tokens or API keys: Use uuid, specifically the uuid.v4() method. Avoid node-uuid - it's not the same package, and doesn't produce reliably secure random values.
If you want to generate random numbers in a range: Use random-number-csprng.

You should seriously consider reading the entire article, though - it's

Edit — February 2019

This gist had a far larger impact than I imagined it would, and apparently people are still finding it, so a quick update:

TC39 is currently moving forward with a slightly different version of TLA, referred to as 'variant B', in which a module with TLA doesn't block sibling execution. This vastly reduces the danger of parallelizable work happening in serial and thereby delaying startup, which was the concern that motivated me to write this gist
In the wild, we're seeing (async main(){...}()) as a substitute for TLA. This completely eliminates the blocking problem (yay!) but it's less powerful, and harder to statically analyse (boo). In other words the lack of TLA is causing real problems
Therefore, a version of TLA that solves the original issue is a valuable addition to the language, and I'm in full support of the current proposal, which you can read here.

I'll leave the rest of this document unedited, for archaeological

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🇫🇷 Cette liste en français

	{
	"AWSTemplateFormatVersion": "2010-09-09",

	"Description": "Keep alive functions",

	"Resources": {
	"LambdaPolicy": {
	"Type": "AWS::IAM::ManagedPolicy",
	"Properties": {
	"PolicyDocument": {

	---
	AWSTemplateFormatVersion: 2010-09-09

	Description: >
	A basic CloudFormation template for an RDS Aurora cluster.

	Parameters:
	DatabaseUsername:
	AllowedPattern: "[a-zA-Z0-9]+"
	ConstraintDescription: must be between 1 to 16 alphanumeric characters.

	export {}

	if (typeof Array.prototype.flatMap !== 'function') {
	// eslint-disable-next-line no-extend-native
	Object.defineProperty(Array.prototype, 'flatMap', {
	enumerable: false,
	// https://bterlson.github.io/proposal-flatMap/#sec-Array.prototype.flatMap
	value: function flatMap (callback, thisArg = undefined) {
	const O = toObject(this)
	const A = arraySpeciesCreate(O, 0)

	/**
	* Code from:
	* https://github.com/expressjs/express/pull/2809
	*
	* Target Express version: { "express": "^4.14.0 <5.0.0" }
	*
	* This monkey patch allows to return Promises from middleware and route handlers, rejections will be handled automaticaly.
	*
	* Please note:
	* If you return something from `(...) -> void` callbacks - you shoot your own leg.

	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>AWS IoT Pub/Sub Demo</title>
	</head>
	<body>
	<h1>AWS IoT Pub/Sub Demo</h1>
	<form>
	<button type="button" id="connect">connect!</button>