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− | Orion 5.0 | + | Orion 5.0 moved to [https://github.com/nzakas/eslint/ ESLint] as the validator that ships with Orion. This page captures ongoing issues. |
== Rules == | == Rules == | ||
− | + | The following table describes all of the rules currently available in Orion and ones that we plan to add in the future. | |
− | {| class="wikitable" border="1" style="width: 100%;" | + | Rules that are currently available are <del>struck out</del>. |
− | ! | + | |
− | ! | + | {| class="wikitable" border="1" cellpadding="5" cellspacing="0" style="width: 100%;" |
− | ! | + | ! style="background:#efefef;" width=5% | Rule |
− | ! Details | + | ! style="background:#efefef;" width=5% | Default Severity |
+ | ! style="background:#efefef;" width=5% | Available Since | ||
+ | ! style="background:#efefef;" width=40%| Problem Message | ||
+ | ! style="background:#efefef;" width=40% | Details | ||
|- | |- | ||
− | | block-scoped-var | + | !| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=428433 block-scoped-var] |
− | | | + | | Error |
− | | | + | | - |
+ | | '''{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 | + | !| brace-style |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
|- | |- | ||
− | | camelcase | + | !| camelcase |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
|- | |- | ||
− | | complexity | + | !| complexity |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
|- | |- | ||
− | | consistent-this | + | !| consistent-this |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
|- | |- | ||
− | | curly | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429722 curly]</del> |
− | | | + | | Ignore |
− | | | + | | 6.0 |
+ | | ''Statements should be enclosed in braces.'' | ||
+ | | | ||
|- | |- | ||
− | | dot-notation | + | !| dot-notation |
− | | | + | | Warning |
− | | {a} is better written in dot notation. | + | | - |
+ | | ''{a} is better written in dot notation.'' | ||
+ | | | ||
|- | |- | ||
− | | eqeqeq | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=414779 eqeqeq]</del> |
− | | '' | + | | Warning |
− | + | | 5.0 | |
− | | | + | | |
+ | * ''Expected '===' and saw '=='.'' | ||
+ | * ''Expected '!==' and saw '!='.'' | ||
+ | | | ||
|- | |- | ||
− | | guard-for-in | + | !| guard-for-in |
− | | | + | | Ignore |
− | | The body of a for in should be wrapped in an if statement to filter unwanted properties from the prototype. | + | | - |
+ | | ''The body of a <code>for in</code> should be wrapped in an <code>if</code> statement to filter unwanted properties from the prototype.'' | ||
+ | | | ||
|- | |- | ||
− | | max-depth | + | !| max-depth |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | Enforces max depth of nested blocks within a function. | ||
|- | |- | ||
− | | max-len | + | !| max-len |
− | | | + | | Ignore |
− | | | + | | - |
+ | | ''Line is too long.'' | ||
+ | | Enforces a maximum line length. | ||
|- | |- | ||
− | | max-params | + | !| max-params |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
|- | |- | ||
− | | max-statements | + | !| max-statements |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
+ | |- | ||
+ | |||
+ | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=424128 missing-doc]</del> | ||
+ | | Ignore | ||
+ | | 5.0 | ||
+ | | "Missing documentation for function '{name}.'" | ||
+ | | Flags missing documentation nodes on function declarations and function expressions when they appear as object properties | ||
|- | |- | ||
− | | | + | !| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=424204 missing-doc-items] |
+ | | Ignore | ||
| - | | - | ||
− | | | + | | |
+ | | Flags missing documentation for parameters, returns, throws, etc on function declarations and function expressions when they appear as object properties | ||
|- | |- | ||
− | | | + | !| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=428429 missing-nls] |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | Flags String literals that are not properly NLS'd | ||
|- | |- | ||
− | | | + | !| new-cap |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''A constructor name should start with an uppercase letter.'' | ||
+ | | | ||
|- | |- | ||
− | | | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429801 new-parens]</del> |
− | | | + | | Error |
− | | | + | | 6.0 |
+ | | ''Missing parentheses invoking constructor.'' | ||
+ | | Flags <code>new Whatever</code> | ||
|- | |- | ||
− | | no- | + | !| no-alert |
− | | | + | | Ignore |
− | | | + | | - |
+ | | '''{alert, confirm, prompt}' is not defined.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| no-bitwise |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Unexpected use of '{operator}'.'' | ||
+ | | JSLint disallows bitwise ops by default. | ||
|- | |- | ||
− | | no- | + | !| no-caller |
+ | | Ignore | ||
| - | | - | ||
− | | | + | | |
− | | Flags | + | | Flags references to <code>arguments.callee</code> and <code>arguments.caller</code>. |
|- | |- | ||
− | | no- | + | !| no-catch-shadow |
− | | | + | | Warning |
− | | | + | | - |
+ | | '''{a}' is already defined.'' | ||
+ | | | ||
+ | * Flags a <code>catch</code> clause's variable that shadows a variable declared in an outer scope. (In IE8 this [http://weblog.bocoup.com/the-catch-with-try-catch/ causes the outer variable to be overwritten]). | ||
|- | |- | ||
− | | no- | + | !| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=426723 no-comma-dangle] |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Unexpected comma.'' | ||
+ | | Flags trailing commas in object literals and array declarations. | ||
|- | |- | ||
− | | no- | + | !| no-cond-assign |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | Flags assignment in an <code>if/while/do..while/for</code> condition. | ||
|- | |- | ||
− | | no- | + | !| no-console |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| no-control-regex |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | Flags control characters (U+0000–U+001F and U+007F) within the source argument to the RegExp constructor. | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429690 no-debugger]</del> |
− | | | + | | Warning |
− | | | + | | 6.0 |
+ | | ''debugger' statement use is discouraged.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| no-delete-var |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Deleting a local variable is discouraged.'' | ||
+ | | Flags an attempt to <code>delete</code> a local variable. | ||
|- | |- | ||
− | | no- | + | !| no-div-regex |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''A regular expression literal can be confused with '/='.'' | ||
+ | | Flags a regex literal starting with <code>/=</code> | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=428430 no-dupe-keys]</del> |
− | | | + | | Error |
− | | | + | | 6.0 |
+ | | ''Duplicate object key '{key}'.'' | ||
+ | | Flags object literals that contain the same key more than once. | ||
|- | |- | ||
− | | no- | + | !| no-else-return |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags an <code>else</code> appearing after an <code>if</code> that contains a <code>return</code>. | ||
|- | |- | ||
− | | no-empty | + | !| no-empty-class |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Empty class.'' | ||
+ | | Flags an empty character class <code>[]</code> within a regular expression. | ||
|- | |- | ||
− | | no- | + | !| no-empty-label |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Label '{a}' is not allowed on this statement.'' | ||
+ | | Flags a labeled statement that is not a <code>switch</code>, <code>for</code>, or <code>while</code>. | ||
|- | |- | ||
− | | no- | + | !| <del>no-empty</del> |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags an empty block like <code>if (something) { }</code>. | ||
|- | |- | ||
− | | no- | + | !| no-eq-null |
− | | | + | | Error |
− | | | + | | - |
+ | | ''Use '===' to compare with 'null'.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429702 no-eval]</del> |
− | | | + | | Ignore |
− | | | + | | 6.0 |
+ | | '''eval' function calls are discouraged.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| no-ex-assign |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Do not assign to the exception parameter.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=428040 no-extra-semi]</del> |
− | | | + | | Warning |
− | | | + | | 5.0 |
+ | | ''Unnecessary semicolon.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429815 no-fallthrough]</del> |
− | | | + | | Error |
− | | | + | | - |
+ | | ''Switch case may be entered by falling through previous case. If intended, add a new comment //$FALL-THROUGH$ on the line above'' | ||
+ | | Flags a fallthrough case within a <code>switch</code> statement, unless it is explicitly commented. | ||
|- | |- | ||
− | | no- | + | !| no-floating-decimal |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''A {leading, trailing} decimal point can be confused with a dot: '{n}'.'' | ||
+ | | Flags numeric literals that have a leading or trailing decimal point. | ||
|- | |- | ||
− | | no- | + | !| no-func-assign |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags assignment to a variable that's already bound to a <code>FunctionExpression</code>. | ||
|- | |- | ||
− | | no- | + | !| no-global-strict |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags <code>"use strict"</code> applied to the entire Program. | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429707 no-implied-eval]</del> |
− | | | + | | Ignore |
− | | | + | | 6.0 |
+ | | ''Implicit 'eval' function calls are discouraged.'' | ||
+ | | Flags calls to the string-argument form of <code>setTimeout</code> and <code>setInterval</code>, which implicitly perform <code>eval</code>. This rule logic was merged to be part of the <b>no-eval</b> rule. | ||
|- | |- | ||
− | | no- | + | !| no-iterator |
− | | | + | | Error |
− | | | + | | - |
+ | | ''Reserved name '__iterator__'.'' | ||
+ | | Flags use of __iterator__ as an identifier name or property key. | ||
|- | |- | ||
− | | no- | + | !| no-label-var |
− | | | + | | Error |
− | | | + | | - |
+ | | '''{label}' is already defined.'' | ||
+ | | Flags labels that collide with an identifier. | ||
|- | |- | ||
− | | no- | + | !| no-loop-func |
− | | | + | | Error |
− | | | + | | - |
+ | | ''Don't make functions within a loop.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| no-mixed-requires |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | Flags Node.js <code>require()</code>s that mix different types of requires (core, module, file, computed). | ||
|- | |- | ||
− | | no- | + | !| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=425200 no-mixed-returns] |
− | | | + | | Error |
− | | | + | | - |
+ | | | ||
+ | | Flags functions that return more than one kind of item, for example returning String and Object | ||
|- | |- | ||
− | | no- | + | !| no-multi-str |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags use of ES5 multiline string literals. | ||
|- | |- | ||
− | | no- | + | !| no-native-reassign |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | * ''Read only.'' | ||
+ | * ''Bad assignment.'' (if assigning to <code>undefined</code>) | ||
+ | | Flags an attempt to reassign a native object like <code>Math</code>, Array, <code>undefined</code>, etc. | ||
|- | |- | ||
− | | no- | + | !| no-negated-in-lhs |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | | ||
+ | * Flags a unary <code>!</code> operator applied to the LHS of an in statement, which negates the LHS, not the <code>in</code>. | ||
+ | * Eg. <code>(!"key" in {key: 1})</code> (which always evaluates to false), will be flagged. | ||
|- | |- | ||
− | | no-new- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429817 no-new-array]</del> |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Use the array literal notation [].'' | ||
+ | | Flags <code>new Array()</code>. | ||
|- | |- | ||
− | | no-new | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429817 no-new-func]</del> |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''The Function constructor is eval.'' | ||
+ | | Flags <code>new Function()</code>. | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429817 no-new-object]</del> |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Use the object literal notation {}.'' | ||
+ | | Flags <code>new Object()</code>. | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429817 no-new-wrappers]</del> |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Do not use {String, Number, Boolean, Math, JSON} as a constructor.'' | ||
+ | | Flags <code>new</code> applied to any of those. | ||
|- | |- | ||
− | | no- | + | !| no-new |
− | | | + | | Error |
− | | | + | | - |
+ | | ''Do not use 'new' for side effects.'' | ||
+ | | Flags uses of <code>new</code> operator in an expression that is not assigned to anything. | ||
|- | |- | ||
− | | no- | + | !| no-obj-calls |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Math is not a function..'' | ||
+ | | | ||
+ | * Flags attempts to call object properties of the global object (<code>Math</code>, <code>JSON</code>) as a function, like <code>Math()</code>. | ||
|- | |- | ||
− | | no- | + | !| no-octal-escape |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Bad escapement.'' | ||
+ | | Flags octal escapes in strings, for example <code>var x = "Copyright \251";</code> | ||
|- | |- | ||
− | | no- | + | !| no-octal |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Don't use extra leading zeros '{n}'.'' | ||
+ | | Flags number literals that begin with leading 0s, which indicate a (probably accidental) octal literal. | ||
|- | |- | ||
− | | no- | + | !| no-plusplus |
− | | | + | | Warning |
+ | | - | ||
| | | | ||
+ | * ''Unexpected use of '++''' | ||
+ | * ''Unexpected use of '--''' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| no-proto |
− | | | + | | Error |
− | | | + | | - |
+ | | | ||
+ | * ''Reserved name '__proto__' should not be assigned." | ||
+ | * 'Reserved name '__proto__' should not be used as a key." | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=414779 no-redeclare]</del> |
− | | | + | | Warning |
− | | | + | | 5.0 |
+ | | '''{a}' is already defined.'' | ||
+ | | Usually results from having two <code>for</code> loops in the same function that share a loop variable declaration like <code>var i=...</code>. | ||
|- | |- | ||
− | | no- | + | !| no-return-assign |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | | ||
+ | * Prevents assignment in a <code>return</code> statement. | ||
+ | * Unsupported by JSLint, although JSLint does require parens around a return-assignment, eg: <code>return (x = 2);</code> | ||
|- | |- | ||
− | | no- | + | !| no-script-url |
− | | | + | | Warning |
+ | | - | ||
+ | | | ||
| | | | ||
+ | * Flags string literals beginning with <code>javascript:</code>. (Script URLs are a form of <code>eval</code>.) | ||
|- | |- | ||
− | | no- | + | !| no-self-compare |
− | | | + | | Error |
− | | | + | | - |
+ | | | ||
+ | | Flags comparisons where the left- and right-hand sides are the same. | ||
|- | |- | ||
− | | no- | + | !!| [https://bugs.eclipse.org/bugs/show_bug.cgi?id=438319 no-shadow] |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags variables that have the same name as a variable declared in an outer scope. | ||
|- | |- | ||
− | | no- | + | !| no-spaced-func |
− | | | + | | Ignore |
− | | | + | | - |
+ | | ''Unnecessary space in function call.'' | ||
+ | | Report on excess space in a function call, for example <code>myFunc ();</code> or <code>new MyObj ();</code> | ||
|- | |- | ||
− | | no- | + | !| no-sync |
− | | ''' | + | | Ignore |
− | + | | - | |
+ | | ''Unexpected sync method: '{a}'.'' | ||
+ | | | ||
+ | * Flags Node.js's synchronous I/O methods. | ||
+ | * The '''stupid''' option is supported only in newer versions of JSLint (not Orion's). | ||
|- | |- | ||
+ | !| no-ternary | ||
+ | | Ignore | ||
+ | | - | ||
+ | | | ||
+ | | Flags any use of the ternary operator <code>cond ? thenExpr : elseExpr</code> | ||
+ | |- | ||
− | | no- | + | !| no-undef-init |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''It is not necessary to initialize '{variable}' to 'undefined'.'' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=427310 no-unused-params]</del> |
− | | | + | | Warning |
− | | | + | | - |
+ | | "Parameter '{param}' is not used." | ||
+ | | Flags parameters in function declarations / expressions if they are not being used | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=414779 no-undef]</del> |
− | | | + | | Error |
− | | | + | | 5.0 |
+ | | '''{variable}' is not defined.'' | ||
+ | | | ||
+ | * Flags references to a global variable that is not listed in a /*global*/ or /*globals*/ block. | ||
+ | * Predefined environments (eg. '''node''', '''browser''') can be set in the /*jslint */ block. | ||
|- | |- | ||
− | | no- | + | !| no-underscore-dangle |
− | | | + | | Ignore |
− | | | + | | - |
+ | | ''Dangling '_''' | ||
+ | | | ||
|- | |- | ||
− | | no- | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=436986 no-unreachable]</del> |
− | | | + | | Error |
− | | | + | | - |
+ | | ''Unreachable code.'' | ||
+ | | Flags statements that occur after a <code>return</code>, <code>throw</code>, etc. | ||
|- | |- | ||
− | | no- | + | !| no-unused-expressions |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Expected an assignment or function call and instead saw an expression.'' | ||
+ | | Flags expressions that appear in a statement context and don't cause side effects. | ||
|- | |- | ||
− | | no- | + | !| <deL>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=414779 no-unused-vars]</del> |
− | | | + | | Warning |
− | | | + | | 5.0 |
+ | | ''Function declares unused variable '{a}'.'' | ||
+ | | | ||
|- | |- | ||
− | | | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=414779 no-use-before-define]</del> |
− | | | + | | Warning |
− | | | + | | 5.0 |
+ | | '''{a}' was used before it was defined.'' | ||
+ | | | ||
|- | |- | ||
− | | | + | !| no-with |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Expected an identifier and instead saw 'with'.'' | ||
+ | | Treated as fatal parse error in JSLint. | ||
|- | |- | ||
− | | | + | !| no-wrap-func |
− | | | + | | Ignore |
− | | | + | | - |
+ | | ''Do not wrap function literals in parens unless they are to be immediately invoked.'' | ||
+ | | Flags a parenthesized function literal that is not immediately invoked, eg. <code>(function fun(){})</code> | ||
|- | |- | ||
− | | | + | !| object-prototype-external |
− | | | + | | Warning |
− | | | + | | - |
+ | | | ||
+ | | Flags calls to methods of <code>Object.prototype</code> that rely on the prototype chain. For example this code should be flagged: | ||
+ | <source lang="javascript" line="line"> | ||
+ | foo.hasOwnProperty("bar") | ||
+ | </source> | ||
+ | |||
+ | Example (1) is [https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty?redirectlocale=en-US&redirectslug=JavaScript%2FReference%2FGlobal_Objects%2FObject%2FhasOwnProperty#hasOwnProperty_as_a_property unsafe], as <code>foo</code> may have a property named <code>hasOwnProperty</code>, or have been constructed via <code>Object.create(null)</code>. | ||
+ | |||
+ | As for this: | ||
+ | |||
+ | <source lang="javascript" line="line" start="2"> | ||
+ | Object.hasOwnProperty.call(foo, "bar") | ||
+ | </source> | ||
+ | |||
+ | Example (2) technically relies on the prototype chain as well: the hasOwnProperty method is defined on Object.prototype, not Object. Object inherits the methods of Object.prototype [http://stackoverflow.com/questions/14817826/difference-between-an-object-and-its-prototype/14817913#14817913 through its prototype chain]. However (2) is unlikely to fail, as sane JavaScript programs will not modify the global objects' prototypes. If we choose to flag (2), it should only be for style. | ||
|- | |- | ||
− | | | + | !| one-var |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Too many var statements.'' | ||
+ | | Allows only 1 <code>var</code> statement per function. | ||
|- | |- | ||
− | | | + | !| quote-props |
+ | | Warning | ||
| - | | - | ||
− | | | + | | |
− | | | + | | Requires object literal keys to be quoted with " or '. |
|- | |- | ||
− | | | + | !| quotes |
− | | | + | | Ignore |
− | | | + | | - |
+ | | | ||
+ | | Flags any use of single or double quote marks, depending on setting. | ||
|- | |- | ||
− | | | + | !| radix |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Missing radix parameter.'' | ||
+ | | Affects parseInt(). | ||
|- | |- | ||
− | | | + | !| regex-spaces |
− | | | + | | Warning |
− | | | + | | - |
+ | | ''Spaces are hard to count. Use {n}.'' | ||
+ | | | ||
|- | |- | ||
− | | | + | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=427930 semi]</del> |
− | + | | Warning | |
− | + | | 5.0 | |
− | | | + | | ''Missing semicolon.'' |
+ | | | ||
|- | |- | ||
− | | | + | !| strict |
+ | | Ignore | ||
| - | | - | ||
− | | Wrap the /regexp/ literal in parens to disambiguate the slash operator. | + | | |
+ | | Flags any code that lacks the <code>"use strict"</code> pragma. | ||
+ | |- | ||
+ | |||
+ | !| throw-error | ||
+ | | Warning | ||
+ | | 7.0 | ||
+ | | | ||
+ | | Flags code that throws a non-Error, eg. <code>throw "a problem occurred";</code> | ||
+ | |- | ||
+ | |||
+ | |||
+ | !| unnecessary-strict | ||
+ | | Warning | ||
+ | | - | ||
+ | | | ||
+ | | Flags <code>"use strict"</code> on a function when the entire Program is already in strict mode. | ||
+ | |- | ||
+ | |||
+ | !| <del>[https://bugs.eclipse.org/bugs/show_bug.cgi?id=429711 use-isnan]</del> | ||
+ | | Error | ||
+ | | 6.0 | ||
+ | | ''Use the isNaN function to compare with NaN.'' | ||
+ | | | ||
+ | |- | ||
+ | |||
+ | !| wrap-iife | ||
+ | | Ignore | ||
+ | | - | ||
+ | | | ||
+ | * ''Wrap the entire immediate function invocation in parens.'' | ||
+ | * ''Move the invocation into the parens that contain the function.'' | ||
+ | | Flags missing parens on immediately-invoked functions, eg. <code>function(){ console.log('hi'); }();</code> | ||
+ | |- | ||
+ | |||
+ | !| wrap-regex | ||
+ | | Warning | ||
+ | | - | ||
+ | | ''Wrap the /regexp/ literal in parens to disambiguate the slash operator.'' | ||
+ | | | ||
|- | |- | ||
Line 444: | Line 698: | ||
|} | |} | ||
− | == | + | == Tests == |
− | + | * Every rule needs extensive unit tests | |
− | # | + | * Unit tests should use Mocha |
+ | |||
+ | Currently the tests are run from Node.js. They do not run in the browser (yet). | ||
+ | |||
+ | === Test requirements === | ||
+ | First install [http://nodejs.org/ Node.js]. Then open a console and install Mocha globally: | ||
+ | |||
+ | $ npm install mocha -g | ||
+ | |||
+ | Then from your Orion client repository, run these commands to install eslint's dependencies: | ||
+ | |||
+ | $ cd bundles/org.eclipse.orion.client.javascript/web/eslint/ | ||
+ | $ npm install | ||
+ | |||
+ | === Running the tests === | ||
+ | From the <code>bundles/org.eclipse.orion.client.javascript/web/eslint/</code> directory, simply run <code>npm test</code>: | ||
+ | |||
+ | $ npm test | ||
+ | |||
+ | > eslint@0.2.0-dev test c:\Users\mamacdon\code\orion\client\bundles\org.eclipse.orion.client.javascript\web\eslint | ||
+ | > bash scripts/test.sh | ||
+ | |||
+ | |||
+ | ...................................................................... | ||
+ | ............... | ||
+ | |||
+ | 85 passing (106ms) | ||
+ | |||
+ | To run only a subset of the tests, launch mocha from the command line, passing the test file: | ||
+ | |||
+ | $ mocha tests/lib/rules/semi.js | ||
+ | |||
+ | ............ | ||
+ | |||
+ | 12 passing (17ms) | ||
+ | |||
+ | You can also pass an entire directory: | ||
+ | |||
+ | $ mocha tests/lib/rules | ||
+ | |||
+ | ...................................................................... | ||
+ | .......... | ||
+ | |||
+ | 80 passing (104ms) | ||
+ | |||
+ | To run only some tests from a file, use the --grep option: | ||
+ | |||
+ | $ mocha tests/lib/rules/semi.js --grep VariableDeclaration | ||
+ | |||
+ | . | ||
+ | |||
+ | 1 passing (5ms) | ||
+ | |||
+ | See [http://visionmedia.github.io/mocha/#usage Mocha usage options] for more. | ||
+ | |||
+ | == User interface == | ||
+ | * <del>Should we have a UI for configuring what rules are active?</del> [https://bugs.eclipse.org/bugs/show_bug.cgi?id=424268 bug 424268]. | ||
+ | * Should we try to support <code>.eslintrc</code>? This would be an ideal project-scope setting. | ||
+ | * Should we try to honor equivalent JSLint/JSHint flags when possible? For example <code>/*jslint eqeqeq:false */</code> could disable the eqeqeq rule on a per-file basis. | ||
+ | ** This would give compatibility with Orion codebase which uses these flags. | ||
+ | ** OTOH, eslint now has its own syntax for this: <code>/*eslint ..*/</code>, which we should perhaps use instead. | ||
+ | |||
+ | == i18n == | ||
+ | We need to support i18n. Pre-req is {{bug|422278}} (orion.edit.validator support for i18n). | ||
+ | |||
+ | [[Category:Orion]] |
Revision as of 19:40, 10 July 2014
Orion 5.0 moved to ESLint as the validator that ships with Orion. This page captures ongoing issues.
Rules
The following table describes all of the rules currently available in Orion and ones that we plan to add in the future.
Rules that are currently available are struck out.
Rule | Default Severity | Available Since | Problem Message | Details |
---|---|---|---|---|
block-scoped-var | Error | - | '{variable}' is already defined. |
|
brace-style | Ignore | - | ||
camelcase | Ignore | - | ||
complexity | Ignore | - | ||
consistent-this | Ignore | - | ||
|
Ignore | 6.0 | Statements should be enclosed in braces. | |
dot-notation | Warning | - | {a} is better written in dot notation. | |
|
Warning | 5.0 |
|
|
guard-for-in | Ignore | - | The body of a for in should be wrapped in an if statement to filter unwanted properties from the prototype.
|
|
max-depth | Ignore | - | Enforces max depth of nested blocks within a function. | |
max-len | Ignore | - | Line is too long. | Enforces a maximum line length. |
max-params | Ignore | - | ||
max-statements | Ignore | - | ||
|
Ignore | 5.0 | "Missing documentation for function '{name}.'" | Flags missing documentation nodes on function declarations and function expressions when they appear as object properties |
missing-doc-items | Ignore | - | Flags missing documentation for parameters, returns, throws, etc on function declarations and function expressions when they appear as object properties | |
missing-nls | Ignore | - | Flags String literals that are not properly NLS'd | |
new-cap | Warning | - | A constructor name should start with an uppercase letter. | |
|
Error | 6.0 | Missing parentheses invoking constructor. | Flags new Whatever
|
no-alert | Ignore | - | '{alert, confirm, prompt}' is not defined. | |
no-bitwise | Warning | - | Unexpected use of '{operator}'. | JSLint disallows bitwise ops by default. |
no-caller | Ignore | - | Flags references to arguments.callee and arguments.caller .
| |
no-catch-shadow | Warning | - | '{a}' is already defined. |
|
no-comma-dangle | Warning | - | Unexpected comma. | Flags trailing commas in object literals and array declarations. |
no-cond-assign | Ignore | - | Flags assignment in an if/while/do..while/for condition.
| |
no-console | Ignore | - | ||
no-control-regex | Ignore | - | Flags control characters (U+0000–U+001F and U+007F) within the source argument to the RegExp constructor. | |
|
Warning | 6.0 | debugger' statement use is discouraged. | |
no-delete-var | Warning | - | Deleting a local variable is discouraged. | Flags an attempt to delete a local variable.
|
no-div-regex | Warning | - | A regular expression literal can be confused with '/='. | Flags a regex literal starting with /=
|
|
Error | 6.0 | Duplicate object key '{key}'. | Flags object literals that contain the same key more than once. |
no-else-return | Warning | - | Flags an else appearing after an if that contains a return .
| |
no-empty-class | Warning | - | Empty class. | Flags an empty character class [] within a regular expression.
|
no-empty-label | Warning | - | Label '{a}' is not allowed on this statement. | Flags a labeled statement that is not a switch , for , or while .
|
|
Warning | - | Flags an empty block like if (something) { } .
| |
no-eq-null | Error | - | Use '===' to compare with 'null'. | |
|
Ignore | 6.0 | 'eval' function calls are discouraged. | |
no-ex-assign | Warning | - | Do not assign to the exception parameter. | |
|
Warning | 5.0 | Unnecessary semicolon. | |
|
Error | - | Switch case may be entered by falling through previous case. If intended, add a new comment //$FALL-THROUGH$ on the line above | Flags a fallthrough case within a switch statement, unless it is explicitly commented.
|
no-floating-decimal | Warning | - | A {leading, trailing} decimal point can be confused with a dot: '{n}'. | Flags numeric literals that have a leading or trailing decimal point. |
no-func-assign | Warning | - | Flags assignment to a variable that's already bound to a FunctionExpression .
| |
no-global-strict | Warning | - | Flags "use strict" applied to the entire Program.
| |
|
Ignore | 6.0 | Implicit 'eval' function calls are discouraged. | Flags calls to the string-argument form of setTimeout and setInterval , which implicitly perform eval . This rule logic was merged to be part of the no-eval rule.
|
no-iterator | Error | - | Reserved name '__iterator__'. | Flags use of __iterator__ as an identifier name or property key. |
no-label-var | Error | - | '{label}' is already defined. | Flags labels that collide with an identifier. |
no-loop-func | Error | - | Don't make functions within a loop. | |
no-mixed-requires | Ignore | - | Flags Node.js require() s that mix different types of requires (core, module, file, computed).
| |
no-mixed-returns | Error | - | Flags functions that return more than one kind of item, for example returning String and Object | |
no-multi-str | Warning | - | Flags use of ES5 multiline string literals. | |
no-native-reassign | Warning | - |
|
Flags an attempt to reassign a native object like Math , Array, undefined , etc.
|
no-negated-in-lhs | Warning | - |
| |
|
Warning | - | Use the array literal notation []. | Flags new Array() .
|
|
Warning | - | The Function constructor is eval. | Flags new Function() .
|
|
Warning | - | Use the object literal notation {}. | Flags new Object() .
|
|
Warning | - | Do not use {String, Number, Boolean, Math, JSON} as a constructor. | Flags new applied to any of those.
|
no-new | Error | - | Do not use 'new' for side effects. | Flags uses of new operator in an expression that is not assigned to anything.
|
no-obj-calls | Warning | - | Math is not a function.. |
|
no-octal-escape | Warning | - | Bad escapement. | Flags octal escapes in strings, for example var x = "Copyright \251";
|
no-octal | Warning | - | Don't use extra leading zeros '{n}'. | Flags number literals that begin with leading 0s, which indicate a (probably accidental) octal literal. |
no-plusplus | Warning | - |
|
|
no-proto | Error | - |
|
|
|
Warning | 5.0 | '{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 | Warning | - |
| |
no-script-url | Warning | - |
| |
no-self-compare | Error | - | Flags comparisons where the left- and right-hand sides are the same. | |
no-shadow | Warning | - | Flags variables that have the same name as a variable declared in an outer scope. | |
no-spaced-func | Ignore | - | Unnecessary space in function call. | Report on excess space in a function call, for example myFunc (); or new MyObj ();
|
no-sync | Ignore | - | Unexpected sync method: '{a}'. |
|
no-ternary | Ignore | - | Flags any use of the ternary operator cond ? thenExpr : elseExpr
| |
no-undef-init | Warning | - | It is not necessary to initialize '{variable}' to 'undefined'. | |
|
Warning | - | "Parameter '{param}' is not used." | Flags parameters in function declarations / expressions if they are not being used |
|
Error | 5.0 | '{variable}' is not defined. |
|
no-underscore-dangle | Ignore | - | Dangling '_' | |
|
Error | - | Unreachable code. | Flags statements that occur after a return , throw , etc.
|
no-unused-expressions | Warning | - | Expected an assignment or function call and instead saw an expression. | Flags expressions that appear in a statement context and don't cause side effects. |
|
Warning | 5.0 | Function declares unused variable '{a}'. | |
|
Warning | 5.0 | '{a}' was used before it was defined. | |
no-with | Warning | - | Expected an identifier and instead saw 'with'. | Treated as fatal parse error in JSLint. |
no-wrap-func | Ignore | - | Do not wrap function literals in parens unless they are to be immediately invoked. | Flags a parenthesized function literal that is not immediately invoked, eg. (function fun(){})
|
object-prototype-external | Warning | - | Flags calls to methods of Object.prototype that rely on the prototype chain. For example this code should be flagged:
Example (1) is unsafe, as As for this:
Example (2) technically relies on the prototype chain as well: the hasOwnProperty method is defined on Object.prototype, not Object. Object inherits the methods of Object.prototype through its prototype chain. However (2) is unlikely to fail, as sane JavaScript programs will not modify the global objects' prototypes. If we choose to flag (2), it should only be for style. | |
one-var | Warning | - | Too many var statements. | Allows only 1 var statement per function.
|
quote-props | Warning | - | Requires object literal keys to be quoted with " or '. | |
quotes | Ignore | - | Flags any use of single or double quote marks, depending on setting. | |
radix | Warning | - | Missing radix parameter. | Affects parseInt(). |
regex-spaces | Warning | - | Spaces are hard to count. Use {n}. | |
|
Warning | 5.0 | Missing semicolon. | |
strict | Ignore | - | Flags any code that lacks the "use strict" pragma.
| |
throw-error | Warning | 7.0 | Flags code that throws a non-Error, eg. throw "a problem occurred";
| |
unnecessary-strict | Warning | - | Flags "use strict" on a function when the entire Program is already in strict mode.
| |
|
Error | 6.0 | Use the isNaN function to compare with NaN. | |
wrap-iife | Ignore | - |
|
Flags missing parens on immediately-invoked functions, eg. function(){ console.log('hi'); }();
|
wrap-regex | Warning | - | Wrap the /regexp/ literal in parens to disambiguate the slash operator. |
Tests
- Every rule needs extensive unit tests
- Unit tests should use Mocha
Currently the tests are run from Node.js. They do not run in the browser (yet).
Test requirements
First install Node.js. Then open a console and install Mocha globally:
$ npm install mocha -g
Then from your Orion client repository, run these commands to install eslint's dependencies:
$ cd bundles/org.eclipse.orion.client.javascript/web/eslint/ $ npm install
Running the tests
From the bundles/org.eclipse.orion.client.javascript/web/eslint/
directory, simply run npm test
:
$ npm test > eslint@0.2.0-dev test c:\Users\mamacdon\code\orion\client\bundles\org.eclipse.orion.client.javascript\web\eslint > bash scripts/test.sh ...................................................................... ............... 85 passing (106ms)
To run only a subset of the tests, launch mocha from the command line, passing the test file:
$ mocha tests/lib/rules/semi.js ............ 12 passing (17ms)
You can also pass an entire directory:
$ mocha tests/lib/rules ...................................................................... .......... 80 passing (104ms)
To run only some tests from a file, use the --grep option:
$ mocha tests/lib/rules/semi.js --grep VariableDeclaration . 1 passing (5ms)
See Mocha usage options for more.
User interface
-
Should we have a UI for configuring what rules are active?bug 424268. - Should we try to support
.eslintrc
? This would be an ideal project-scope setting. - Should we try to honor equivalent JSLint/JSHint flags when possible? For example
/*jslint eqeqeq:false */
could disable the eqeqeq rule on a per-file basis.- This would give compatibility with Orion codebase which uses these flags.
- OTOH, eslint now has its own syntax for this:
/*eslint ..*/
, which we should perhaps use instead.
i18n
We need to support i18n. Pre-req is bug 422278 (orion.edit.validator support for i18n).