List of rules

Requires overload signatures to be adjacent to each other. Details about undefined

Disallows the use of Typescript directives without a comment. Details about undefined

Bans the use of primitive wrapper objects (e.g. String the object is a wrapper of string the primitive) in addition to the non-explicit Function type and the misunderstood Object type. Details about undefined

Warns the usage of unknown rule codes in ignore directives. Details about undefined

Requires deno-lint-ignore to be annotated with one or more rule names. Details about undefined

Requires TODOs to be annotated with either a user tag (@user) or an issue reference (#issue). Details about undefined

Warns unused ignore directives. Details about undefined

Checks that a <button> JSX element has a valid type attribute. The default value is "submit" which is often not the desired behavior. Details about undefined

Enforces the use of camelCase in variable names. Details about undefined

Verifies the correct usage of constructors and calls to super(). Details about undefined

Enforces default parameter(s) to be last in the function signature. Details about undefined

Enforces the use of type-safe equality operators === and !== instead of the more error prone == and != operators. Details about undefined

Requires all functions to have explicit return types. Details about undefined

Requires all module exports to have fully typed declarations. Details about undefined

Requires for loop control variables to increment in the correct direction. Details about undefined

Checks correct naming for named fresh middleware export. Details about undefined

Disallows event handlers in fresh server components. Details about undefined

Requires all property getter functions to return a value. Details about undefined

Require for-in loops to include an if statement. Details about undefined

Enforce a consistent JSX boolean value style. Passing true as the boolean value can be omitted with the shorthand syntax. Details about undefined

Enforce <button> elements to have a type attribute. If a <button> is placed inside a <form> element it will act as a submit button by default which can be unexpected. Details about undefined

Ensure consistent use of curly braces around JSX expressions. Details about undefined

Ensure the key attribute is present when passing iterables into JSX. It allows frameworks to optimize checking the order of elements. Details about undefined

Pass children as JSX children instead of as an attribute. Details about undefined

JavaScript comments inside text nodes are rendered as plain text in JSX. This is often unexpected. Details about undefined

Disallow duplicated JSX props. Later props will always overwrite earlier props often leading to unexpected results. Details about undefined

Leaving the > or } character in JSX is often undesired and difficult to spot. Enforce that these characters must be passed as strings. Details about undefined

Fragments are only necessary at the top of a JSX "block" and only when there are multiple children. Fragments are not needed in other scenarios. Details about undefined

Spreading the same expression twice is typically a mistake and causes unnecessary computations. Details about undefined

Ensure that void elements in HTML don't have any children as that is not valid HTML. See Void element article on MDN for more information. Details about undefined

Enforce conventional usage of array construction. Details about undefined

Requires that async promise executor functions are not used. Details about undefined

Requires await is not used in a for loop body. Details about undefined

Disallow await keyword inside a non-async function. Details about undefined

Requires all functions called with any amount of boolean literals as parameters to use a self-documenting constant instead. Details about undefined

Requires lexical declarations (let, const, function and class) in switch case or default clauses to be scoped with brackets. Details about undefined

Disallows modifying variables of class declarations. Details about undefined

Disallows comparing against negative zero (-0). Details about undefined

Disallows the use of the assignment operator, =, in conditional statements. Details about undefined

Disallows the use of the console global. Details about undefined

Disallows modifying a variable declared as const. Details about undefined

Disallows the use of a constant expression in conditional test. Details about undefined

Disallows the use ASCII control characters in regular expressions. Details about undefined

Disallows the use of the debugger statement. Details about undefined

Disallows the deletion of variables. Details about undefined

Warns the usage of the deprecated - Deno APIs. Details about undefined

Disallows using an argument name more than once in a function signature. Details about undefined

Disallows using a class member function name more than once. Details about undefined

Disallows using the same condition twice in an if/else if statement. Details about undefined

Disallows duplicate keys in object literals. Details about undefined

Disallows using the same case clause in a switch statement more than once. Details about undefined

Disallows the use of empty block statements. Details about undefined

Disallows using the empty character class in a regular expression. Details about undefined

Disallows the declaration of an empty enum. Details about undefined

Disallows the declaration of an empty interface. Details about undefined

Disallows the use of empty patterns in destructuring. Details about undefined

Disallows the use of eval. Details about undefined

Disallows the reassignment of exception parameters. Details about undefined

Disallows use of the any type. Details about undefined

Disallows the use of external imports. Details about undefined

Disallows unnecessary boolean casts. Details about undefined

Disallows unnecessary non-null assertions. Details about undefined

Disallows the implicit fallthrough of case statements. Details about undefined

Disallows the overwriting/reassignment of an existing function. Details about undefined

Disallows assignment to native Javascript objects. Details about undefined

Disallows the use of implicit exports in ["ambient" namespaces]. Details about undefined

Disallows the assert keyword for import attributes. Details about undefined

Disallows reassignment of imported module bindings. Details about undefined

Disallows easily inferrable types. Details about undefined

Disallows variable or function definitions in nested blocks. Details about undefined

Disallows specifying invalid regular expressions in RegExp constructors. Details about undefined

Warns the wrong usage of triple-slash reference directives. Details about undefined

Disallows the use of non-space or non-tab whitespace characters. Details about undefined

Disallows defining constructors for interfaces or new for classes Details about undefined

Disallows the use of namespace and module keywords in TypeScript code. Details about undefined

Disallows the use of new operators with built-in Symbols. Details about undefined

Disallows the use of NodeJS global objects. Details about undefined

Disallow non-null assertions after an optional chain expression. Details about undefined

Disallow non-null assertions using the ! postfix operator. Details about undefined

Disallows calling built-in global objects like functions. Details about undefined

Disallows expressing octal numbers via numeric literals beginning with 0. Details about undefined

Disallows the use of NodeJS process global. Details about undefined

Disallows the use of Object.prototype builtins directly. Details about undefined

Disallows redeclaration of variables, functions, parameters with the same name. Details about undefined

Disallows multiple spaces in regular expression literals. Details about undefined

Disallows self assignments. Details about undefined

Disallows comparisons where both sides are exactly the same. Details about undefined

Disallows returning values from setters. Details about undefined

Disallows shadowing of restricted names. Details about undefined

Enforces specifying explicit references to paths in module specifiers. Details about undefined

Enforces using types that are explicit or can be simply inferred. Details about undefined

Disallows sparse arrays. Details about undefined

Disallow sync function inside async function. Details about undefined

Disallows assigning variables to this. Details about undefined

Disallows use of this or super before calling super() in constructors. Details about undefined

Disallow throwing literals as exceptions. Details about undefined

Disallows the use of top level await expressions. Details about undefined

Disallow the use of undeclared variables. Details about undefined

Disallows the unreachable code after the control flow statements. Details about undefined

Disallows the use of control flow statements within finally blocks. Details about undefined

Disallows the usage of negation operator ! as the left operand of relational operators. Details about undefined

Disallows unused labels. Details about undefined

Enforces all variables are used at least once. Details about undefined

Disallow useless rename operations where both the original and new name are exactly the same. This is often a leftover from a refactoring procedure and can be safely removed. Details about undefined

Enforces the use of block scoped variables over more error prone function scoped variables. Block scoped variables are defined using const and let keywords. Details about undefined

Disallows the use of the window object. Details about undefined

Disallows the use of Web APIs via the window object. Details about undefined

Disallows the usage of with statements. Details about undefined

Recommends using const assertion (as const) over explicitly specifying literal types or using type assertion. Details about undefined

Ensures that the code is fully written in ASCII characters. Details about undefined

Recommends declaring variables with [const] over [let]. Details about undefined

Recommends the use of namespace keyword over module keyword when declaring TypeScript module. Details about undefined

Suggests using frozen intrinsics from primordials rather than the default globals. Details about undefined

Prevent the use of dangerouslySetInnerHTML which can lead to XSS vulnerabilities if used incorrectly. Details about undefined

Using JSX children together with dangerouslySetInnerHTML is invalid as they will be ignored. Details about undefined

Ensure that hooks are called correctly in React/Preact components. They must be called at the top level of a component and not inside a conditional statement or a loop. Details about undefined

Disallows async functions that have no await expression or await using declaration. Details about undefined

Disallows generator functions that have no yield. Details about undefined

Disallows multiple variable definitions in the same declaration statement. Details about undefined

Disallow certain triple slash directives in favor of ES6-style import declarations. Details about undefined

Disallows comparisons to NaN. Details about undefined

Restricts the use of the typeof operator to a specific set of string literals. Details about undefined

Enforces type imports to be declared as type imports. Details about undefined