ESLint

• Designed to lint JavaScript code
• Core Concets
  • Rules
  • Parsers
  • Processors - extracts JS code from other files, and/or process JS code.

Config

• Flat config system
  • Configuration Files
  • ESLint’s new config system, Part 2: Introduction to flat config
• The config is an array of config objects: defineConfig([...]).
• “Each configuration object contains all of the information ESLint needs to execute on a set of files.”
• When multiple config objects apply to the same file, they are merged and the later one takes precedence.

TypeScript ESLint

• typescript-eslint
• Allows ESLint to parse TS code, and provides rules that are type based.
• Project Service
  • A way to enable type linting that is “generally easier to configure and faster at runtime”.