Orion/ESLint

Orion 5.0 will replace our current JSLint validator with ESLint. This page captures ongoing issues.

Rules

Here's a table showing the equivalent validation rules in JSLint and ESLint. If a rule has no "JSLint option", then JSLint always enforces it and it cannot be disabled.

ESLint rule	JSLint option	JSLint message	Details
block-scoped-var	-	'{variable}' is already defined.	Occurs when a function-scoped variable is treated as if it was block scoped. ESLint calls this error '{variable} used outside of binding context.'
brace-style
camelcase
complexity
consistent-this
curly
dot-notation	sub	{a} is better written in dot notation.
eqeqeq	eqeqeq eqeq	Expected '===' and saw '=='. Expected '!==' and saw '!='.	eqeq only appears in old versions of JSLint (like Orion's), has opposite on/off state to eqeqeq.
guard-for-in	forin	The body of a for in should be wrapped in an if statement to filter unwanted properties from the prototype.
max-depth
max-len
max-params
max-statements
new-cap	-	A constructor name should start with an uppercase letter.
new-parens
no-alert
no-bitwise
no-caller
no-catch-shadow
no-comma-dangle	-	Unexpected comma.	Flags trailing commas in object literals.
no-cond-assign
no-console
no-control-regex
no-debugger
no-delete-var
no-div-regex
no-dupe-keys
no-else-return
no-empty-class
no-empty-label
no-empty
no-eq-null
no-eval
no-ex-assign
no-extra-semi
no-fallthrough
no-floating-decimal
no-func-assign
no-global-strict
no-implied-eval
no-iterator
no-label-var
no-loop-func
no-mixed-requires
no-multi-str
no-native-reassign
no-negated-in-lhs
no-new-array
no-new-func
no-new-object
no-new-wrappers
no-new
no-obj-calls
no-octal-escape
no-octal
no-plusplus
no-proto
no-redeclare	-	"'{a}' is already defined."	Usually results from having two for loops in the same function that share a loop variable declaration like var i=....
no-return-assign
no-script-url
no-self-compare
no-shadow
no-spaced-func
no-sync
no-ternary
no-undef-init
no-undef	-	'{variable}' is not defined.	Any global variables must be listed in a /*global*/ or /*globals*/ block. Predefined environments (eg. node, browser, require) can be set in /*jslint */ options.
no-underscore-dangle
no-unreachable
no-unused-expressions
no-unused-vars
no-use-before-define	-	'{a}' was used before it was defined.
no-with	-	Expected an identifier and instead saw 'with'.	Treated as fatal parse error in JSLint.
no-wrap-func
one-var
quote-props
quotes		Strings must use doublequote.	Only if "jsonmode"
radix	-	Missing radix parameter.	Affects parseInt()
regex-spaces
semi	-	Missing semicolon.
strict	strict		Requires "use strict" pragma.
unnecessary-strict
use-isnan	-	Use the isNaN function to compare with NaN.
wrap-iife	immed	Wrap the entire immediate function invocation in parens. Do not wrap function literals in parens unless they are to be immediately invoked. Move the invocation into the parens that contain the function.
wrap-regex	-	Wrap the /regexp/ literal in parens to disambiguate the slash operator.

Rule priority

Here are the rules we want, in order of priority:

1. no-undef