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Best Practices

Rules which enforce generally accepted best practices.
  • AvoidWithStatement: Avoid using with - it’s bad news
  • ConsistentReturn: ECMAScript does provide for return types on functions, and therefore there is no solid rule as to…
  • GlobalVariable: This rule helps to avoid using accidently global variables by simply missing the “var” declaratio…
  • ScopeForInVariable: A for-in loop in which the variable name is not explicitly scoped to the enclosing scope with the…
  • UseBaseWithParseInt: This rule checks for usages of parseInt. While the second parameter is optional and usually defau…

Code Style

Rules which enforce a specific coding style.
  • AssignmentInOperand: Avoid assignments in operands; this can make code more complicated and harder to read. This is s…
  • ForLoopsMustUseBraces: Avoid using ‘for’ statements without using curly braces.
  • IfElseStmtsMustUseBraces: Avoid using if..else statements without using curly braces.
  • IfStmtsMustUseBraces: Avoid using if statements without using curly braces.
  • NoElseReturn: The else block in a if-else-construct is unnecessary if the ‘if’ block contains a return.Then the…
  • UnnecessaryBlock: An unnecessary Block is present. Such Blocks are often used in other languages tointroduce a new…
  • UnnecessaryParentheses: Unnecessary parentheses should be removed.
  • UnreachableCode: A ‘return’, ‘break’, ‘continue’, or ‘throw’ statement should be the last in a block. Statements a…
  • WhileLoopsMustUseBraces: Avoid using ‘while’ statements without using curly braces.

Error Prone

Rules to detect constructs that are either broken, extremely confusing or prone to runtime errors.
  • AvoidTrailingComma: This rule helps improve code portability due to differences in browser treatment of trailing comm…
  • EqualComparison: Using == in condition may lead to unexpected results, as the variables are automatically casted t…
  • InnaccurateNumericLiteral: The numeric literal will have a different value at runtime, which can happen if you provide too m…

Additional rulesets