gaearon

Note:

When this guide is more complete, the plan is to move it into Prepack documentation.
For now I put it out as a gist to gather initial feedback.

A Gentle Introduction to Prepack (Part 1)

If you're building JavaScript apps, you might already be familiar with some tools that compile JavaScript code to equivalent JavaScript code:

• Babel lets you use newer JavaScript language features, and outputs equivalent code that targets older JavaScript engines.

busypeoples

let str = ReasonReact.string;

let url = "http://localhost:3000/users";

type user = {
  id: int,
  name: string,
};

type state =

dylanmckay

#! /usr/bin/env ruby

# NOTE: Requires Ruby 2.1 or greater.

# This script can be used to parse and dump the information from
# the 'html/contact_info.htm' file in a Facebook user data ZIP download.
#
# It prints all cell phone call + SMS message + MMS records, plus a summary of each.
#
# It also dumps all of the records into CSV files inside a 'CSV' folder, that is created

kentcdodds

import React from 'react'

function Login({onSubmit}) {
  return (
    <div>
      <form
        data-test="login-form"
        onSubmit={e => {
          e.preventDefault()
          const {username, password} = e.target.elements

trueadm

// I'm suggesting we add a new "adopt X from <Y />" syntax to the JSX language
// it would de-sugar to render prop children, but look and read better than
// what we currently have. For example:

// 1.
// this sugar
function MyComponent(props) {
  adopt foo from <Bar />;
  return <div>{foo}</div>;
}

jgrahamc

addEventListener('fetch', event => {
  event.respondWith(fetchAndCheckPassword(event.request))
})

async function fetchAndCheckPassword(req) {
  if (req.method == "POST") {
    try {
      const post = await req.formData();
      const pwd = post.get('password')
      const enc = new TextEncoder("utf-8").encode(pwd)

broerjuang

type product = {
  category: string,
  price: string,
  stocked: bool,
  name: string
};

type products = list(product);

let products = [

FiberJW

{
  "name": "<Your App Name Here />",
  "reason": {
    "react-jsx": 2
  },
  "bsc-flags": ["-bs-super-errors"],
  "bs-dependencies": ["reason-react"],
  "sources": [
    {
      "dir": "./src",

headius

Algorithm

1. A secret byte you want to read is stored at inaccessible memory location priv_mem.
2. The sender triggers an access exception by attempting to read priv_mem.
3. Due to CPU optimization (out-of-order execution), the load of secret from priv_mem and the use of its value in (4) and (5) below may execute before the exception is triggered.
4. Calculate an offset into a known array probe by multiplying secret by the width of a cache line (or whatever block size the CPU typically fetches, like a 4096-byte page). This guarantees each of those 256 possible offsets will cache separately.
5. Load probe[offset], which causes the CPU to cache exactly one chunk of of our array, populating one cache line.
6. The exception finally triggers, clearing the modified registers...but cached data is not excised.
7. Iterate over all 256 offsets into probe to find out which one loads fast. You've determined the value of secret.

rootkea

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#ifdef _MSC_VER
#include <intrin.h> /* for rdtscp and clflush */
#pragma optimize("gt",on)
#else
#include <x86intrin.h> /* for rdtscp and clflush */
#endif