ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. In many ways, it is similar to JSLint and JSHint with a few exceptions:

* ESLint uses Espree for JavaScript parsing * ESLint uses an AST to evaluate patterns in code * ESLint is completely pluggable, every single rule is a plugin and you can add more at runtime

Some uses of ESLint require additional packages: * Use of parsers other than the default (Espree) require that parser, e.g. node-babel-eslint, node-esprima, or node-esprima-fb. * Use of option --init require package node-inquirer.