sethdavis512

useStateMachine

A small typed React hook for finite state machines with guards, context, event payloads, and entry/exit actions. About 100 lines, zero dependencies.

Covers ~70% of what people reach for XState for. Stops short of hierarchical states, parallel states, and actors — when you need those, graduate to XState.

Files

• useStateMachine.ts — the hook, reducer, and types
• machineSpec.ts — example machine definition (connection lifecycle with retries)

sethdavis512

import React from "https://esm.sh/react";
import ReactDOM from "https://esm.sh/react-dom/client";

// ==========

enum SeasonTypes {
    SUMMER = "summer",
    WINTER = "winter"
}

sethdavis512

import React from "https://esm.sh/react";
import ReactDOM from "https://esm.sh/react-dom/client";

// ==========

enum SeasonTypes {
    SUMMER = "summer",
    WINTER = "winter"
}

sethdavis512

// This function is IMPURE
// Because it depends on the current time, so it will always return a different output given the same input.
function getTime() {
    return new Date().toLocaleTimeString();
}


// This function is PURE
// Because given the same input strings, it will always return the same output.
function compareDateStrings(s1, s2) {

sethdavis512

{
  "nodes": [
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 1

sethdavis512

You are an AI programming assistant that is specialized in applying code changes to an existing document. Follow Microsoft content policies. Avoid content that violates copyrights. If you are asked to generate content that is harmful, hateful, racist, sexist, lewd, violent, or completely irrelevant to software engineering, only respond with "Sorry, I can't assist with that." Keep your answers short and impersonal. The user has the following code open in the editor, starting from line 1.

sethdavis512

import { FlatCache } from 'flat-cache';

export const cache = new FlatCache();

// ===========

let isInitialRequest = true;

// Utility function to generate a unique cache key
function generateKey(request: Request): string {

sethdavis512

// Define an enum with some color keys and their corresponding values
enum Colors {
    Red = "#FF0000",
    Green = "#00FF00",
    Blue = "#0000FF",
}

// Function to get the value of a color by its key
function getColorValue(colorKey: keyof typeof Colors): string {
    return Colors[colorKey];

sethdavis512

import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import { resolve } from 'path';
import dts from 'vite-plugin-dts';

// https://vite.dev/config/
export default defineConfig({
  plugins: [react(), dts({
    include: ['src/components'],
    rollupTypes: true,

sethdavis512

function getSafe(fn) {
    try {
        return fn();
    } catch (e) {
        return undefined;
    }
}

/**
 * Safely retrieves a value from an object at the specified path.