Fix Common TypeScript Issues | The Qodana Blog

Efim Samoylov discusses how Qodana, a code analysis tool, addresses gaps in TypeScript projects that are not covered by ESLint, such as cross-file analysis for issues like unused exports, implicit any propagation, non-null assertions, floating promises, and duplicated logic across files. While ESLint is commonly used in TypeScript projects to catch obvious issues, it operates within the scope of individual files and requires type-aware configurations for comprehensive analysis, which can be complex and less common. Qodana overcomes these limitations by offering whole-project analysis with type-aware checks that consistently flag problematic patterns, such as the silent propagation of any types, unsafe non-null assertions, unawaited promises leading to runtime errors, and duplicated logic leading to maintenance challenges. The tool integrates into the CI pipeline without blocking ongoing development by using a baseline feature that records the current state of the codebase, allowing teams to focus on newly introduced issues while keeping the existing backlog visible without hindering the workflow.