Fix: TypeScript Generic Type Constraint Errors
How to fix TypeScript generic constraint errors — Type 'X' does not satisfy the constraint 'Y', generic inference failures, constrained generics with extends, and conditional types.
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Fix: CSS Grid Not Working (display: grid Has No Effect)
How to fix CSS Grid not working — grid-template-columns has no effect, grid items not placing correctly, implicit vs explicit grid confusion, and common grid layout debugging techniques.
Fix: Docker Compose depends_on Not Waiting for Service to Be Ready
How to fix Docker Compose depends_on not working — services start in order but the app still crashes because depends_on only waits for container start, not service readiness. Includes healthcheck solutions.
Fix: CORS Not Working in Express (Access-Control-Allow-Origin Missing)
How to fix CORS errors in Express.js — cors middleware not applying, preflight OPTIONS requests failing, credentials not allowed, and specific origin whitelisting issues.
Fix: .gitignore Not Working (Files Still Being Tracked)
How to fix .gitignore not working — files still showing in git status after being added to .gitignore, caused by already-tracked files, wrong syntax, nested gitignore rules, and cache issues.
Fix: Cron Job Not Running on Linux
How to fix cron jobs not running on Linux — caused by PATH issues, missing newlines, permission errors, environment variables not set, and cron daemon not running.
Fix: Next.js Environment Variables Returning undefined
How to fix Next.js environment variables returning undefined — NEXT_PUBLIC prefix rules, server vs client context, .env file loading order, and runtime vs build-time variable access.
Fix: Python asyncio Not Running / async Functions Not Executing
How to fix Python asyncio not running — coroutines never executing, RuntimeError no running event loop, mixing sync and async code, and common async/await mistakes in Python.
Fix: React.lazy and Suspense Errors (Element Type Invalid, Loading Chunk Failed)
How to fix React.lazy and Suspense errors — Element type is invalid, A React component suspended while rendering, Loading chunk failed, and lazy import mistakes with named vs default exports.
Fix: TypeScript Path Aliases Not Working (Cannot Find Module '@/...')
How to fix TypeScript path aliases not resolving — tsconfig paths configured but imports still fail at runtime, in Jest, or after building with webpack, Vite, or ts-node.
Fix: Webpack HMR (Hot Module Replacement) Not Working
How to fix Webpack Hot Module Replacement not updating the browser — HMR connection lost, full page reloads instead of hot updates, and HMR breaking in Docker or behind a proxy.
Fix: CSS Flexbox Not Working (display: flex Has No Effect)
How to fix CSS Flexbox not working — why display flex has no effect, flex children not aligning, flex-grow not stretching, and how to debug common Flexbox layout issues.