711 articles — Page 35 of 60
How to fix pnpm peer dependency errors — why pnpm is stricter than npm about peer deps, how to resolve missing peers, configure peerDependencyRules, and handle incompatible version ranges.
How to fix Python dataclass mutable default errors — why lists, dicts, and sets cannot be default field values, how to use field(default_factory=...), and common dataclass pitfalls with inheritance and ClassVar.
How to fix React Query refetching infinitely — why useQuery keeps fetching, how object and array dependencies cause loops, how to stabilize queryKey, and configure refetch behavior correctly.
How to fix Socket.IO connection failures — CORS errors, transport fallback issues, wrong namespace, server not emitting to the right room, and how to debug Socket.IO connections in production.
How to fix Spring Boot 'Failed to configure a DataSource' errors — missing URL property, driver class not found, connection refused, and how to correctly configure datasource properties for MySQL, PostgreSQL, and H2.
How to fix TypeScript isolatedModules errors — why const enum fails with Babel and Vite, how to replace const enum, fix re-exported types, and configure isolatedModules correctly for your build tool.
How to fix Vitest configuration not taking effect — why setupFiles don't run, globals are undefined, mocks don't work, and how to configure Vitest correctly for React, Vue, and Node.js projects.
How to fix AWS RDS connection timeout errors from Lambda functions and EC2 instances — security group configuration, VPC settings, connection pooling, and RDS Proxy setup for Lambda.
How to fix Docker Compose not loading environment variables from .env files — why variables are empty or undefined inside containers, the difference between env_file and variable substitution, and how to debug env var issues.
How to fix ESLint's import/no-unresolved errors when modules actually resolve correctly — configure eslint-import-resolver-typescript, fix path alias settings, and handle node_modules that ESLint cannot find.
How to fix GitHub Actions cache not restoring — why actions/cache always misses, how to construct correct cache keys, debug cache hits and misses, and optimize caching for npm, pip, and Gradle.
How to fix jest.mock() not intercepting module calls — why mocks are ignored, how to correctly mock ES modules, default exports, named exports, and fix hoisting issues in Jest tests.