ErrLookup › oxc-project/oxc

oxc-project/oxc

⚓ A collection of high-performance JavaScript tools. · Rust · 3,101 source files

Analyzed at 12cb547351 on 2026-09-20. 1104 documented errors.

Code / Message	Type	Severity	Tags
Do not use `instanceof` with built-in constructors	validation	warning	cross-realm, typeof, builtin-objects, type-checking, oxlint
Do not use useless `undefined`.	validation	warning	lint, oxlint, unicorn, undefined, dead-code, pedantic, typescript
Component definition is missing display name.	validation	warning	react, jsx, lint, devtools, debugging, oxlint
`button` elements must have a valid `type` attribute.	validation	warning	react, jsx, html, lint, forms, oxlint
`nextTick` is a function.	validation	error	vue, nexttick, async, lint, autofix
Namespace not marked type-only declare are disabled. To…	validation	warning	oxc, typescript, transformer, namespaces, config
`defineOptions` is referencing locally declared variables.	validation	error	vue, script-setup, compiler-macro, defineoptions, lint
Expecting object for eslint/no-magic-numbers configuration	validation	error	lint, configuration, oxlintrc, json, schema-validation
Avoid using promises inside of callbacks.	validation	warning	promise, async, callback, lint, oxlint
`checked` should be used with either `onChange` or…	validation	warning	react, jsx, lint, controlled-components, forms, oxlint
Pass a message to the	validation	warning	oxlint, lint, unicorn, errors, debugging
Dependency cycle detected	validation	error	lint, oxlint, imports, circular-dependency, module-graph, architecture
` ` accepts an iterable, `.toArray()` is unnecessary.	validation	warning	lint, oxlint, unicorn, iterator-helpers, iterable, performance, nursery
`button` elements must have an explicit `type` attribute.	validation	warning	react, jsx, html, lint, forms, oxlint
has been deprecated in favor of	console	warning	lint, jest, deprecated-api, testing, oxlint, autofix
' ' is not modified in this loop.	validation	error	eslint, oxlint, no-unmodified-loop-condition, loops, infinite-loop, control-flow
' ' is a reserved attribute and cannot be used as props.	validation	error	vue, props, lint, reserved-names, template
Ambient modules cannot be nested in other modules or…	validation	warning	oxc, typescript, transformer, ambient-modules, declaration-files, ts2664
Invalid handler prop name	validation	warning	react, jsx, naming-convention, event-handler, props, oxlint, lint
Please provide an explicit key value. Using \"key\" as a…	validation	warning	oxc, jsx, react, key, transformer
Using polyfill.io is a security risk due to a supply chain…	validation	critical	nextjs, security, supply-chain, polyfill, jsx, oxlint
Promise should not be resolved multiple times. Promise is…	validation	warning	promise, async, lint, control-flow, oxlint
Promise constructor parameters must be named to match	validation	warning	promise, async, lint, naming-convention, oxlint
Prop " " should be optional.	validation	warning	vue, props, lint, options-api, script-setup
Avoid using non-standard `Promise.	validation	warning	promise, async, lint, portability, oxlint
Missing padding before	validation	warning	jest, style, formatting, lint, autofix
Using a spread operator here creates a new	validation	warning	lint, oxlint, unicorn, spread, shallow-clone, redundant-copy, correctness
Function ` ` does not capture any variables from its parent…	validation	warning	oxlint, lint, unicorn, scoping, functions, performance
Duplicate key ' '. May cause name collision in script or…	validation	warning	vue, duplicate-key, lint, naming, options-api, script-setup
`expect` must be inside of a test block.	validation	warning	jest, vitest, oxlint, testing, assertions, static-analysis
Unexpected constant relational comparison	validation	warning	lint, relational-operator, constant-folding, dead-code, oxlint
function and catch parameter scopes always have a parent	panic	error	rust, panic, internal-invariant, scope-resolution, oxc-semantic
Expected method to have this.	validation	warning	eslint, oxlint, class, static-method, style
Unexpected constant condition	validation	warning	lint, dead-code, condition, infinite-loop, oxlint
Module has named export	console	warning	lint, oxlint, imports, default-export, named-export, confusion, suspicious
Fragments should contain more than one child.	validation	warning	react, jsx, fragment, dead-code, autofix, oxlint, lint
' ' is not defined.	validation	error	react, jsx, undefined-variable, imports, globals, oxlint, lint
Top-level await is not available in the configured target…	validation	warning	oxc, transformer, top-level-await, browserslist, targets, es2022
' .	validation	warning	eslint, oxlint, curly, braces, style
Do not use `document.cookie` directly.	validation	warning	browser, dom, cookies, web-api, oxlint
Prefer ` ` over ` ` to check .	validation	warning	oxlint, lint, unicorn, arrays, style, comparison
State initialization should be in a constructor	validation	error
Unexpected constant on the left-hand side of a expression	validation	error	lint, dead-code, operator-precedence, logical-expression, oxlint
Expected a `const` assertion instead of a literal type…	validation	error
Tried to get an allocator from an empty…	panic	warning	vue, oxlint, lint, sfc, export, style, definecomponent
Unexpected side effect in	validation	warning	vue, computed, lint, side-effects, options-api
' ' is already a global variable.	validation	warning	eslint, oxlint, no-shadow, scope, globals, static-analysis
Expected and instead saw	validation	warning	eslint, oxlint, equality, strict-equality, autofix
Unexpected constant binary expression	validation	error	lint, dead-code, equality, truthiness, oxlint
Invalid escape sequence in template literal.	validation	warning	oxlint, lint, unicorn, template-literals, escaping, style
The `name` property should be set to	validation	warning	oxlint, lint, unicorn, errors, classes, naming
Unexpected dangling '_' in	validation	info	eslint, oxlint, no-underscore-dangle, style, naming-convention, identifiers
`defineOptions()` cannot be used to declare	validation	error	vue, script-setup, compiler-macro, defineoptions, defineprops, defineemits, lint
Expected return with your callback function.	validation	warning	node, callback, control-flow, style, oxlint
Promise should not be resolved multiple times. Promise is…	validation	warning	promise, async, lint, control-flow, oxlint
Invalid class name, use	validation	warning	oxlint, lint, unicorn, errors, naming, classes
Unexpected named .	validation	warning	eslint, oxlint, naming, function-expression, anonymous-function
React Hook has missing dependencies	validation	error
Await the Promise returned by `nextTick` or pass a callback…	validation	error	vue, nexttick, async, promise, lint
Big integer literals are not available in the configured…	validation	error	oxc, transformer, es2020, bigint, compile-target
The update clause in this loop moves the variable in the…	validation	error	eslint, oxlint, for-loop, infinite-loop, bug
Unsafe lifecycle method	validation	error
Either await the Promise or pass a callback function to…	validation	error	vue, nexttick, async, promise, lint, redundant
`TS1202` Import assignment cannot be used when targeting ECMAScript modules.	error_code	error	oxc, typescript, transformer, esm, commonjs, ts1202
Unexpected comparison to newly constructed object	validation	error	lint, reference-equality, object-comparison, dead-code, oxlint
Missing JSDoc `@param` name.	validation	error
Prefer `async`/`await` to the callback pattern	validation	warning	promise, async-await, callbacks, oxlint, lint, style
`Promise. ()` requires 1 argument, but received .	validation	error	promise, async, lint, arguments, oxlint
Empty files are not allowed.	validation	info	files, code-hygiene, oxlint
Fast refresh can't handle anonymous components. Add a name…	validation	error
Namespace tags are not supported by default. React's JSX…	validation	warning	oxc, jsx, react, namespace, transformer
`Iterator` has a `. ()` method, `.toArray()` is unnecessary.	validation	warning	lint, oxlint, unicorn, iterator-helpers, array-methods, nursery
Invalid handler name	validation	warning	react, jsx, naming-convention, event-handler, oxlint, lint
` ` accepts an iterable, so it's unnecessary to convert the…	validation	warning	lint, oxlint, unicorn, spread, iterable, promise, set, map, correctness
Property should be declared as a class property.	validation	error
Expected throw instead of Promise.reject	validation	warning	promise, async, lint, error-handling, oxlint
has a complexity of . Maximum allowed is .	validation	warning	eslint, oxlint, complexity, maintainability
These overloads can be combined into one signature with a…	validation	warning	oxlint, lint, typescript, overloads, rest-parameter, style
Bad bitwise operator	validation	warning	oxc, operators, bitwise, logic, typo, oxlint
Empty fallbacks in spreads are unnecessary	validation	warning	lint, oxlint, unicorn, spread, object-literal, dead-code, correctness
A constructor name should not start with a lowercase letter.	validation	warning	eslint, oxlint, style, naming, constructor, new-cap
Name " " is reserved.	validation	warning	vue, naming, lint, reserved-names, components
Avoid calls to the `Array` constructor	validation	warning	eslint, oxlint, style, arrays, best-practice, autofix
Bad comparison sequence	validation	error	oxc, javascript, operators, comparison, logic-bug, oxlint
Suggest using `jest.spyOn()` or `vi.spyOn()`.	validation	warning	jest, vitest, oxlint, testing, mocks, spies, autofix, static-analysis
Bad handler name	validation	warning	react, jsx, naming-convention, event-handler, arrow-function, oxlint, lint
Prefer `.at()` over ` `.	validation	warning	oxlint, unicorn, es2022, arrays, strings, dangerous-fix
Prop " " is forbidden on Components	validation	error
These overloads can be combined into one signature with an…	validation	warning	oxlint, lint, typescript, overloads, optional-parameters, style
A function with a name starting with an uppercase letter…	validation	warning	eslint, oxlint, style, naming, constructor, new-cap
Prop " " with value " " is forbidden on DOM Nodes	validation	error
Invalid `removeEventListener` call.	validation	error	events, dom, memory-leak, bug, oxlint
Top-level `await` prevents this module from being loaded…	validation	warning	node, esm, commonjs, async, packaging, oxlint
Namespaces exporting non-const are not supported by Oxc…	validation	warning	oxc, typescript, transformer, namespaces, babel-compat
also has a named export	console	error	lint, oxlint, imports, default-export, named-export, runtime-bug, undefined, suspicious
Unknown property found	validation	error
Express endpoint handler for	validation	error	express, async, unhandled-rejection, oxlint, error-handling, server
' ' is not a valid ARIA attribute.	validation	warning	jsx-a11y, aria, accessibility, typo, oxlint, lint
Disallow string literals on restricted JSX attributes	validation	warning	react, jsx, i18n, accessibility, aria, string-literals, restriction, oxlint, lint
`style` prop value must be an object.	validation	error