TSLint
TSLint is a static analysis tool for TypeScript code that enforces coding standards, detects errors, and improves code quality by analyzing source code without executing it. It was widely used to check for style issues, potential bugs, and maintainability problems in TypeScript projects, providing customizable rules and integrations with build tools and editors.
Developers should learn TSLint to ensure consistent code style and catch common errors early in TypeScript development, especially in team environments where code reviews are critical. However, it's primarily relevant for maintaining legacy projects, as it has been deprecated in favor of ESLint with TypeScript support, which offers better performance and broader ecosystem integration.