[{"name":"Simplify","comment":" Reports when an expression can be simplified.\n\n🔧 Running with `--fix` will automatically remove all the reported errors.\n\n    config =\n        [ Simplify.rule Simplify.defaults\n        ]\n\n@docs rule\n@docs Configuration, defaults, ignoreCaseOfForTypes\n\n\n## Try it out\n\nYou can try this rule out by running the following command:\n\n```bash\nelm-review --template jfmengels/elm-review-simplify/example --rules Simplify\n```\n\n\n## Simplifications\n\nBelow is the list of all kinds of simplifications this rule applies.\n\n\n### Booleans\n\n    x || True\n    --> True\n\n    x || False\n    --> x\n\n    x && True\n    --> x\n\n    x && False\n    --> False\n\n    not True\n    --> False\n\n    not (not x)\n    --> x\n\n    not >> not\n    --> identity\n\n\n### Comparisons\n\n    x == True\n    --> x\n\n    x /= False\n    --> x\n\n    not x == not y\n    --> x == y\n\n    anything == anything\n    --> True\n\n    anything /= anything\n    --> False\n\n    { r | a = 1 } == { r | a = 2 }\n    --> False\n\n\n### If expressions\n\n    if True then x else y\n    --> x\n\n    if False then x else y\n    --> y\n\n    if condition then x else x\n    --> x\n\n    if condition then True else False\n    --> condition\n\n    if condition then False else True\n    --> not condition\n\n\n    a =\n        if condition then\n            if not condition then\n                1\n            else\n                2\n        else\n            3\n    --> if condition then 2 else 3\n\n\n### Case expressions\n\n    case condition of\n        True -> x\n        False -> y\n    --> if condition then x else y\n\n    case condition of\n        False -> y\n        True -> x\n    --> if not condition then x else y\n\n    -- only when no variables are introduced in the pattern\n    -- and no custom types defined in the project are referenced\n    case value of\n        Just _ -> x\n        Nothing -> x\n    --> x\n\n\n### Record updates\n\n    { a | b = a.b }\n    --> a\n\n    { a | b = a.b, c = 1 }\n    --> { a | c = 1 }\n\n\n### Field access\n\n    { a = b }.a\n    --> b\n\n    { a | b = c }.b\n    --> c\n\n    { a | b = c }.d\n    --> a.d\n\n    (let a = b in c).d\n    --> let a = b in c.d\n\n\n### Basics functions\n\n    identity x\n    --> x\n\n    f >> identity\n    --> f\n\n    always x y\n    --> x\n\n    f >> always x\n    --> always x\n\n\n### Lambdas\n\n    (\\\\() -> x) data\n    --> x\n\n    (\\\\() y -> x) data\n    --> (\\y -> x)\n\n    (\\\\_ y -> x) data\n    --> (\\y -> x)\n\n\n### Operators\n\n    (++) a b\n    --> a ++ b\n\n\n### Numbers\n\n    n + 0\n    --> n\n\n    n - 0\n    --> n\n\n    0 - n\n    --> -n\n\n    n * 1\n    --> n\n\n    n * 0\n    --> 0\n\n    n / 1\n    --> n\n\n    -(-n)\n    --> n\n\n    negate >> negate\n    --> identity\n\n    negate (negate x)\n    --> x\n\n\n### Strings\n\n    \"a\" ++ \"\"\n    --> \"a\"\n\n    String.isEmpty \"\"\n    --> True\n\n    String.isEmpty \"a\"\n    --> False\n\n    String.concat []\n    --> \"\"\n\n    String.join str []\n    --> \"\"\n\n    String.join \"\" list\n    --> String.concat list\n\n    String.length \"abc\"\n    --> 3\n\n    String.repeat n \"\"\n    --> \"\"\n\n    String.repeat 0 str\n    --> \"\"\n\n    String.repeat 1 str\n    --> str\n\n    String.replace x y \"\"\n    --> \"\"\n\n    String.replace x x z\n    --> z\n\n    String.replace \"x\" \"y\" \"z\"\n    --> \"z\" -- only when resulting string is unchanged\n\n    String.words \"\"\n    --> []\n\n    String.lines \"\"\n    --> []\n\n    String.reverse \"\"\n    --> \"\"\n\n    String.reverse <| String.reverse x\n    --> x\n\n\n### Maybe\n\n    Maybe.map identity x\n    --> x\n\n    Maybe.map f Nothing\n    --> Nothing\n\n    Maybe.map f (Just x)\n    --> Just (f x)\n\n    MaybeThen f Nothing\n    --> Nothing\n\n    Maybe.andThen (always Nothing) x\n    --> Nothing\n\n    Maybe.andThen (\\a -> Just b) x\n    --> Maybe.map (\\a -> b) x\n\n    Maybe.andThen (\\a -> if condition a then Just b else Just c) x\n    --> Maybe.map (\\a -> if condition a then b else c) x\n\n    Maybe.andThen f (Just x)\n    --> f x\n\n    Maybe.withDefault x Nothing\n    --> x\n\n    Maybe.withDefault x (Just y)\n    --> y\n\n\n### Result\n\n    Result.map identity x\n    --> x.and\n\n    Result.map f (Err x)\n    --> Err x\n\n    Result.map f (Ok x)\n    --> Ok (f x)\n\n    Result.andThen f (Err x)\n    --> Err x\n\n    Result.andThen f (Ok x)\n    --> f x\n\n    Result.andThen (\\a -> Ok b) x\n    --> Result.map (\\a -> b) x\n\n    Result.withDefault x (Err y)\n    --> x\n\n    Result.withDefault x (Ok y)\n    --> y\n\n\n### Lists\n\n    a :: []\n    --> [ a ]\n\n    a :: [ b ]\n    --> [ a, b ]\n\n    [ a ] ++ list\n    --> a :: list\n\n    [] ++ list\n    --> list\n\n    [ a, b ] ++ [ c ]\n    --> [ a, b, c ]\n\n    [ a, b ] ++ [ c ]\n    --> [ a, b, c ]\n\n    List.map fn [] -- same for most List functions like List.filter, List.filterMap, ...\n    --> []\n\n    List.map identity list\n    --> list\n\n    List.map identity\n    --> identity\n\n    List.filter (always True) list\n    --> list\n\n    List.filter (\\a -> True) list\n    --> list\n\n    List.filter (always False) list\n    --> []\n\n    List.filter (always True)\n    --> identity\n\n    List.filter (always False)\n    --> always []\n\n    List.filterMap Just list\n    --> list\n\n    List.filterMap (\\a -> Just a) list\n    --> list\n\n    List.filterMap Just\n    --> identity\n\n    List.filterMap (\\a -> if condition a then Just b else Just c) list\n    --> List.map (\\a -> if condition a then b else c) list\n\n    List.filterMap (always Nothing) list\n    --> []\n\n    List.filterMap (always Nothing)\n    --> (always [])\n\n    List.filterMap identity (List.map f x)\n    --> List.filterMap f x\n\n    List.filterMap identity [ Just x, Just y ]\n    --> [ x, y ]\n\n\n    List.concat [ [ a, b ], [ c ] ]\n    --> [ a, b, c ]\n\n    List.concat [ a, [ 1 ], [ 2 ] ]\n    --> List.concat [ a, [ 1, 2 ] ]\n\n    List.concatMap identity x\n    --> List.concat list\n\n    List.concatMap identity\n    --> List.concat\n\n    List.concatMap (\\a -> a) list\n    --> List.concat list\n\n    List.concatMap (\\a -> [ b ]) list\n    --> List.map (\\a -> b) list\n\n    List.concatMap fn [ x ]\n    --> fn x\n\n    List.concatMap (always []) list\n    --> []\n\n    List.concat (List.map f x)\n    --> List.concatMap f x\n\n    List.indexedMap (\\_ value -> f value) list\n    --> List.map (\\value -> f value) list\n\n    List.isEmpty []\n    --> True\n\n    List.isEmpty [ a ]\n    --> False\n\n    List.isEmpty (x :: xs)\n    --> False\n\n    List.all fn []\n    --> True\n\n    List.all (always True) list\n    --> True\n\n    List.any fn []\n    --> True\n\n    List.any (always False) list\n    --> True\n\n    List.range 6 3\n    --> []\n\n    List.length [ a ]\n    --> 1\n\n    List.repeat 0 list\n    --> []\n\n    List.partition fn []\n    --> ( [], [] )\n\n    List.partition (always True) list\n    --> ( list, [] )\n\n\n    List.take 0 x\n    --> []\n\n\n    List.drop 0 x\n    --> x\n\n\n    List.reverse <| List.reverse x\n    --> x\n\n\n### Set\n\n    Set.map fn Set.empty -- same for Set.filter, Set.remove...\n    --> Set.empty\n\n    Set.map identity set\n    --> set\n\n    Set.map identity\n    --> identity\n\n    Set.isEmpty Set.empty\n    --> True\n\n    Set.member x Set.empty\n    --> False\n\n    Set.fromList []\n    --> Set.empty\n\n    Set.toList Set.empty\n    --> []\n\n    Set.length Set.empty\n    --> 0\n\n    Set.intersect Set.empty set\n    --> Set.empty\n\n    Set.diff Set.empty set\n    --> Set.empty\n\n    Set.diff set Set.empty\n    --> set\n\n    Set.union set Set.empty\n    --> set\n\n    Set.insert x Set.empty\n    --> Set.singleton x\n\n    Set.partition fn Set.empty\n    --> ( Set.empty, Set.empty )\n\n    Set.partition (always True) set\n    --> ( set, Set.empty )\n\n\n### Dict\n\n    Dict.isEmpty Dict.empty\n    --> True\n\n    Dict.fromList []\n    --> Dict.empty\n\n    Dict.toList Dict.empty\n    --> []\n\n    Dict.size Dict.empty\n    --> 0\n\n    Dict.member x Dict.empty\n    --> False\n\n\n### Cmd / Sub\n\nAll of these also apply for `Sub`.\n\n    Cmd.batch []\n    --> Cmd.none\n\n    Cmd.batch [ a ]\n    --> a\n\n    Cmd.batch [ a, Cmd.none, b ]\n    --> Cmd.batch [ a, b ]\n\n    Cmd.map identity cmd\n    --> cmd\n\n    Cmd.map fn Cmd.none\n    --> Cmd.none\n\n\n### Json.Decode\n\n    Json.Decode.oneOf [a]\n    --> a\n\n\n### Parser\n\n    Parser.oneOf [a]\n    --> a\n\n","unions":[{"name":"Configuration","comment":" Configuration for this rule. Create a new one with [`defaults`](#defaults) and use [`ignoreCaseOfForTypes`](#ignoreCaseOfForTypes) to alter it.\n","args":[],"cases":[]}],"aliases":[],"values":[{"name":"defaults","comment":" Default configuration for this rule. Use [`ignoreCaseOfForTypes`](#ignoreCaseOfForTypes) if you want to change the configuration.\n\n    config =\n        [ Simplify.defaults\n            |> Simplify.ignoreCaseOfForTypes [ \"Module.Name.Type\" ]\n            |> Simplify.rule\n        ]\n\n","type":"Simplify.Configuration"},{"name":"ignoreCaseOfForTypes","comment":" Ignore some reports about types from dependencies used in case expressions.\n\nThis rule simplifies the following construct:\n\n    module Module.Name exposing (..)\n\n    case value of\n        Just _ -> x\n        Nothing -> x\n    --> x\n\n(Since `v2.0.19`) it will not try to simplify the case expression when some of the patterns references custom types constructors\ndefined in the project. It will only do so for custom types that are defined in dependencies (including `elm/core`).\n\nIf you do happen to want to disable this simplification for a type `Module.Name.Type`, you can configure the rule like this:\n\n    config =\n        [ Simplify.defaults\n            |> Simplify.ignoreCaseOfForTypes [ \"Module.Name.Type\" ]\n            |> Simplify.rule\n        ]\n\nI personally don't recommend to use this function too much, because this could be a sign of premature abstraction, and because\nI think that often [You Aren't Gonna Need this code](https://jfmengels.net/safe-dead-code-removal/#yagni-you-arent-gonna-need-it).\n\nPlease let me know by opening an issue if you do use this function, I am very curious to know;\n\n","type":"List.List String.String -> Simplify.Configuration -> Simplify.Configuration"},{"name":"rule","comment":" Rule to simplify Elm code.\n","type":"Simplify.Configuration -> Review.Rule.Rule"}],"binops":[]}]