Javascript editor & tools

Warn about

potential typos in logical operators missing curly brackets comparison without type coercion unsafe for..in overwriting native object properties future reserved identifiers use of variables before defined arguments.caller and .callee use of comma operator when new is used for side-effects unnecessary grouping operator when code is not in strict mode undefined variables unused variables

Supress warnings about

assignments in if, for, etc console & alert == null eval functions inside loops generator functions without yield "weird" constructions this in a non-constructor function

Environment

Browser Development (console, etc.) jQuery ES6 Module Mozilla JavaScript extensions NodeJS prototype.js QUnit typed array Web workers