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/**
 * Simple observable value store.
 * @template {any} T
 * @param {T | Promise<T>} initial
 */
export function Store(initial) {
  /** @type {Set<(newValue: T) => void>} */
  const subscribers = new Set();
  const store = { value: Promise.resolve(initial) };
  return {

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This script is a quick way to migrate existing Astro-flavoured Markdown pages in an Astro project to MDX pages.

It does the following:

1. Loads all *.md files in your src/pages/ directory
2. Parses each page’s frontmatter
3. Moves the contents of setup in frontmatter into the main file body as required for imports in MDX
4. Writes the updated contents of each page to the same location but as .mdx instead of .md
5. Deletes the original .md file

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/**
 * Get a list of the moves that are currently available to a specific player.
 *
 * @param {import("boardgame.io").Game} game boardgame.io game object
 * @param {import("boardgame.io").Ctx} ctx current game context object
 * @param {import("boardgame.io").PlayerID} playerID the ID of the player to get moves for
 * @returns {string[]} an array of move names
 *
 * @example
 * const game = {

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const plugin = require('tailwindcss/plugin');

const BevelPlugin = plugin(function bevelPlugin({ addUtilities, e }) {
  const base = 0.5;

  const absoluteSizes = Object.entries({
    md: 1.5,
    lg: 2,
    xl: 3,
    '2xl': 4,

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You can extend a boardgame.io storage adapter to add custom functionality.

This example wraps the original setState method to accomplish some other task when the game is over — in this case posting the game logs elsewhere via a hypothetical dumpEndOfGameLog function.

(The example uses the FlatFile storage class, but should work with any other boardgame.io storage class.)

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/**
 * Delete all (or some of) the scrobbles on a Last.fm library page
 * (e.g. https://www.last.fm/user/USERNAME/library)
 *
 * @param {Number} [count=0] Number of scrobbles on page to delete
 * @param {Number} [start=0] Index to start deleting from
 *
 * @example
 * // delete first 20 scrobbles on page
 * deleteScrobbles(20)

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// ES7 with async/await and Promise.all
async function loopIt(array) {
  await Promise.all(array.map(async member => {
    // asyncStuff() will be called in parallel for all array members
    let result = await asyncStuff(member)
  }))
}

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shasum -a 256 name-of-your-file | awk '{printf $1}' | pbcopy

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#!/bin/bash

# Check all required CLIs are available
dependencies=( pdftoppm convert )
for dependency in "${dependencies[@]}"; do
  command -v $dependency >/dev/null 2>&1 || { echo >&2 "‘$dependency’ command is required but it’s not installed. Aborting."; exit 1; }
done

# Create a directory to hold extracted images
if [ ! -d "images" ]; then

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# use string replacement to rename parts of all matching filenames
# based on http://stackoverflow.com/questions/7450818/rename-all-files-in-directory-from-filename-h-to-filename-half
for file in *.wav; do mv "$file" "${file/selection/substitution}"; done