gordonbrander

const $version = Symbol('version')

export const version = state => {
  if state[$version] == null {
    return 0
  }
  return state[$version]
}

export const markSynced = (following, leading) => {

gordonbrander

import Foundation
import Combine

extension DispatchQueue {
    /// Run a closure on a dispatch queue asyncronously.
    /// - Returns a future.
    func future<Output>(
        perform: @escaping () -> Output
    ) -> Future<Output, Never> {
        Future<Output, Never> { promise in

gordonbrander

//
//  Store.swift
//
//  Created by Gordon Brander on 9/15/21.
//
//  MIT LICENSE
//  Copyright 2021 Gordon Brander
//
//  Permission is hereby granted, free of charge, to any person obtaining a
//  copy of this software and associated documentation files (the "Software"),

gordonbrander

import Foundation
import Combine

/// Holds cancellables returned by Publisher until the publisher completes.
///
/// Combine Publishers return a Cancellable that will automatically cancel the Publisher if the
/// Cancellable falls out of scope. Since Publishers can take some time to complete, you often
/// want to hold on to the Cancellable reference until the publisher has completed.
///
/// PublisherManager takes care of the boilerplate of holding on to Cancellables, and helps

gordonbrander

import Foundation

extension Optional {
    struct NilError: Error {
        let file: String
        let line: Int
        let column: Int
        let function: String
    }

gordonbrander

/// ViewStore acts as a state container, typically for some view over the application's central store.
/// You construct a ViewStore and pass it to a subview. Because it is Equatable, you can
/// make the subview Equatable as well, with `.equatable()`. The subview will then only render
/// when the actual value of the state changes.
struct ViewStore<LocalState, LocalAction>: Equatable
    where LocalState: Equatable {
    static func == (
        lhs: ViewStore<LocalState, LocalAction>,
        rhs: ViewStore<LocalState, LocalAction>
    ) -> Bool {

gordonbrander

/*
Released under MIT License
Copyright 2020 Gordon Brander
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 Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all

gordonbrander

const $state = Symbol('state')
const $rendered = Symbol('rendered state')
const $shadow = Symbol('shadow')
const $frame = Symbol('animation frame')

// StoreElement is a deterministic web component,
// inspired loosely by Elm's App Architecture pattern.
export class StoreElement extends HTMLElement {
  constructor() {
    super()

gordonbrander

Microview

What if... Virtual DOM... but by hand?
aha ha, just kidding...
unless.. ?

Microview is a tiny library for writing efficient data-driven DOM rendering logic by hand. DOM writes are driven by a pure data model. Using Microview, you can freely "bash the dom". Writes will be batched — they'll only happen once per animationframe, and only if the data model changes.

gordonbrander

// Creates a frame scheduler that will call callback at most once per frame.
export const FrameScheduler = callback => {
  let isScheduled = false

  const draw = t => {
    isScheduled = false
    callback(t)
  }

  const schedule = () => {