oxc-project/oxc

Documented errors, page 2 of 12. Back to oxc-project/oxc

Code / Message	Type	Severity	Tags
Unexpected control characters	validation	warning	lint, regex, control-characters, invisible-characters, oxlint
Use a regular expression literal instead of the `RegExp`…	validation	warning	eslint, oxlint, regex, style, lint
Type can be trivially inferred from the initializer	validation	warning	typescript, type-inference, redundant-code, oxlint, lint, style
Unexpected empty named `import` block.	validation	warning	lint, oxlint, imports, dead-code, autofix, suspicious
Props are not defined.	validation	error	vue, script-setup, compiler-macro, defineprops, lint, missing-argument
Class component should be written as a function component.	validation	error
Unexpected combining class in character class.	validation	warning	lint, regex, unicode, combining-marks, normalization, javascript
Use either `checked` or `defaultChecked`, but not both.	validation	warning	react, jsx, lint, controlled-components, forms, oxlint
Use of incorrect `href` for the 'a' element.	validation	error	jsx-a11y, accessibility, anchor, href, react, lint, oxlint
Fixed size allocators are only supported on 64-bit…	panic	warning	vue, oxlint, lint, props, type, constructor, autofix
State initialization should be in a class property	validation	error
This overload can be combined with another overload into…	validation	error
`Promise. ()` requires 0 or 1 arguments, but received .	validation	error	promise, async, lint, arguments, oxlint
Property should be declared as a parameter property.	validation	error
React Hook does nothing when called with only one argument.	validation	error
Don't use a zero fraction in the number.	validation	warning	lint, oxlint, unicorn, number-literal, style, autofix
Expected a conditional expression and instead saw an…	validation	error	lint, assignment, condition, typo, oxlint
Promise in `Promise.	validation	warning	async-await, promise, concurrency, oxlint
eval can be harmful.	validation	warning	javascript, eslint, lint, security, eval
Fast refresh only works when a file only exports…	validation	error
Replace default import with named import.	console	warning	lint, oxlint, imports, default-export, import-syntax, style
Do not call `Object.assign()` immediately after…	validation	warning	objects, style, code-quality, oxlint
JSX nesting depth of	validation	warning	react, jsx, nesting-depth, refactoring, style, oxlint, lint
`react-hooks` Functions returned from `useEffectEvent` must not be included in the dependency…	validation	error
an interface declaring no members is equivalent to its…	validation	warning	typescript, lint, interface, inheritance, oxlint
Arbitrary module namespace identifier names are not…	validation	error	oxc, transformer, es2022, modules, import, compile-target
Do not assign a property immediately after initializing an…	validation	warning	objects, style, code-quality, oxlint
Expected a literal string or immutable template literal	validation	warning	lint, oxlint, imports, dynamic-require, static-analysis, bundling
Function ' ' has too many parameters ( ). Maximum allowed…	validation	warning	eslint, oxlint, complexity, function-signature, parameters
Shadowing of global properties such as `undefined` is not…	validation	error	eslint, oxlint, no-shadow-restricted-names, restricted-globals, scope, strict-mode
The Context `value` prop should not be constructed.	validation	warning	react, context, performance, rerender, usememo, oxlint, lint
Misrefactored assign op. Variable appears on both sides of…	validation	error	oxlint, oxc, assignment, refactoring, logic-bug, javascript
No magic number	validation	warning	lint, javascript, magic-numbers, readability, style
The is useless	validation	warning	lint, oxlint, unicorn, set, map, weakmap, dead-code, style
`alert`, `confirm` and `prompt` functions are not allowed	validation	warning	eslint, oxlint, browser, debugging, ui, restriction
{error_message:?}	validation	warning	jest, jasmine, migration, oxlint, lint
Redundant super call in constructor	validation	warning	lint, eslint, oxlint, class, constructor, super
React 19 disallows `javascript:` URLs as a security…	validation	error	react, jsx, security, xss, javascript-url, react-19, oxlint, lint
`TS1203` Export assignment cannot be used when targeting ECMAScript modules.	error_code	error	oxc, typescript, transformer, esm, commonjs, ts1203
All `if` blocks contain the same code at the start	validation	warning	oxlint, oxc, code-duplication, pedantic, javascript, static-analysis
Props are defined in both `defineProps` and `export default	validation	error	vue, script-setup, compiler-macro, defineprops, options-api, lint, duplicate-declaration
The catch parameter should be named	validation	warning	oxlint, lint, unicorn, naming, error-handling
Unexpected aliasing of members of 'this' to local variables.	validation	error
Prefer using method from	validation	error
`TS5042` Option 'project' cannot be mixed with source files on a command line.	validation	error	vue, oxlint, lint, script-setup, defineemits, compiler-macro, hoisting
Your `render` method should have a `return` statement.	validation	error
Expected a `for...of` loop instead of a `for` loop with…	validation	error
The has too many lines ( ). Maximum allowed is .	validation	warning	eslint, oxlint, complexity, function-length, refactor
Variable or `function` declarations are not allowed in…	validation	error	eslint, oxlint, lint, hoisting, scope, functions
Do not call ` ()` immediately after initializing an array.	validation	warning	arrays, style, code-quality, oxlint
Require statement not part of import statement.	validation	error
Unexpected lexical declaration in case block.	validation	error	lint, switch, scope, lexical-declaration, oxlint
Unexpected side effect in computed function.	validation	warning	vue, computed, lint, side-effects, composition-api
Components should use an ES2015 class instead of…	validation	error
Do not mix 'require' and other declarations.	validation	warning	node, commonjs, require, style, oxlint
useState call is not destructured into value + setter pair	validation	error
`expect` is shadowed by a callback parameter and cannot be…	validation	warning	jest, vitest, oxlint, testing, variable-shadowing, static-analysis
Expected to always call `super()` before `this`/`super`…	validation	error	eslint, oxlint, no-this-before-super, classes, inheritance, constructor, control-flow
IIFE with parenthesized arrow function body is considered…	validation	warning	lint, oxlint, unicorn, iife, arrow-function, readability, pedantic
Expected ' ' syntax before ' ' syntax.	validation	info	eslint, oxlint, imports, sorting, style, lint
Invalid fix capabilities. Did you mean 'fix'?	panic	warning	vue, oxlint, lint, computed, control-flow, options-api
Key ` ` is reserved.	validation	warning	vue, naming, lint, reserved-keys, options-api
Missing JSDoc `@yields` declaration for generator function.	validation	warning	jsdoc, generator, documentation, lint, oxlint
Math.min and Math.max combination leads to constant result	validation	error	oxlint, oxc, math, clamp, logic-bug, javascript
`nextTick` expects zero or one parameters.	validation	error	vue, nexttick, lint, too-many-arguments
Combine this with the previous	validation	warning	oxlint, eslint, style, variables, declaration
This comparison will always evaluate to	validation	error	oxlint, oxc, comparison, logic-bug, javascript, operator-precedence
Unexpected irregular whitespace	validation	warning	lint, whitespace, unicode, javascript, copy-paste
`model` definition is deprecated.	validation	warning	vue, oxlint, lint, v-model, vue3, migration, deprecated
Prefer `toHaveBeenCalledTimes()` over `toHaveLength()` when…	validation	warning	jest, vitest, oxlint, mock, autofix
Value must be omitted for boolean attribute	validation	error
Duplicate key ' ' found in JSX elements	validation	error	react, jsx, list-key, duplicate-key, reconciliation, oxlint, lint
Imported module should be assigned	console	warning	lint, import, side-effects, oxlint, esm
Stateless functional components should not use `this`	validation	error
`React` must be in scope when using JSX.	validation	error
Unexpected re-assignment of `const` variable	validation	critical	lint, const, assignment, runtime-error, oxlint
Void DOM element < /> cannot receive children.	validation	error
`defineProps` has both a type-only emit and an argument.	validation	error	vue, typescript, script-setup, compiler-macro, defineprops, lint
Require setup and teardown code to be within a hook.	validation	warning	jest, vitest, oxlint, hooks, test-structure
TypeScript will only remove the inline type specifiers…	validation	warning	typescript, lint, imports, tree-shaking, autofix
Invalid character comparison	validation	error	oxc, javascript, string, comparison, logic-bug, dead-code, oxlint
Empty exports do nothing in module files	validation	error
JSX component must be in PascalCase or SCREAMING_SNAKE_CASE	validation	warning	react, jsx, naming-convention, pascalcase, oxlint, lint
Prefer mock resolved/rejected shorthands for promises.	validation	warning	jest, vitest, mocking, promises, style, oxlint, lint
React Hook has unnecessary dependency	validation	error
Avoid using `.length` as the index in `Array#with()`.	validation	error	arrays, es2023, runtime-error, bug, oxlint
Avoid wrapping return values in Promise.resolve	validation	warning	promise, async, lint, code-style, oxlint
Do not mix core, module, file and computed requires.	validation	warning	node, commonjs, require, style, oxlint
Do not use `setState` in `componentWillUpdate`.	validation	error
This number literal will lose precision at runtime.	validation	error	lint, javascript, numbers, ieee-754, precision, bigint, correctness
Unexpected `super()` because `super` is not a constructor.	validation	error	eslint, oxlint, class, super, extends, typeerror
Lifecycle hook ` ` is called after `await` in `setup()`.	validation	error	vue, async-await, lifecycle, lint, script-setup
Unexpected use of ` `.	validation	warning	lint, bitwise, stylistic, config, oxlint
Expected to always return a value in getter.	validation	error	eslint, oxlint, getter, return-value, possible-error
`TS5081` Cannot find a tsconfig.json file at the current directory	validation	error	vue, oxlint, lint, script-setup, defineemits, compiler-macro, options-api
Exporting mutable ' ' binding, use 'const' instead.	validation	warning	lint, oxlint, imports, export, mutability, esm, style
function ` ` has too many statements ( ). Maximum allowed…	validation	warning	eslint, oxlint, complexity, function-length, statements
No async describe callback	validation	error	jest, vitest, oxlint, describe, async
Unexpected comparison of two newly constructed objects	validation	error	lint, reference-equality, loose-equality, dead-code, oxlint
"body" is not allowed when method is	validation	error	fetch, http, runtime-error, browser, typescript, oxlint