oxc-project/oxc

Documented errors, page 9 of 12. Back to oxc-project/oxc

Code / Message	Type	Severity	Tags
Unexpected implicit coercion to number	validation	warning	eslint, oxlint, lint, coercion, number
Unexpected negation of the left operand of	validation	warning	eslint, oxlint, operators, precedence, in-operator, instanceof
Enforce default clauses in switch statements to be last	validation	warning	eslint, oxlint, switch, clause-order, style
Expect in a promise chain is unreachable after a `return`…	validation	warning	jest, vitest, oxlint, testing, unreachable-code, promise-chain, dead-code, valid-expect-in-promise
Prefer default export to be present on every file that has…	console	warning	lint, import, export, style, esm, oxlint
Use `as ` instead of `< >`.	validation	warning	typescript, oxlint, lint, type-assertion, as-cast, style
`Array.flatMap` performs `Array.map` and `Array.flat` in…	validation	warning	oxlint, unicorn, arrays, performance, es2019, autofix
Negated expression is not allowed in equality check.	validation	error
Prefer using inline type specifiers instead of a top-level…	validation	warning	lint, oxlint, import-plugin, typescript, esm, style
Unused directive (no problems were reported).	validation	error
`yield*` can delegate to an iterable, `.toArray()` is…	validation	warning	lint, oxlint, unicorn, generator, yield, iterator-helpers, nursery
Disallow recursive access to `this` within	validation	error
Expected to return a value in computed property.	validation	error
File is larger than `isize::MAX` bytes	exception	error
`expect. ` must be awaited or returned	validation	error
Prefer using a top-level type-only import instead of inline…	validation	warning	lint, oxlint, import-plugin, typescript, esm, style
' ' import is restricted from being used.	validation	warning	lint, eslint, no-restricted-imports, es-modules, dependencies, configuration
not found in imported namespace .	validation	error
This default export is missing a name	validation	error
' . ' is restricted from being used.	validation	warning	lint, eslint, no-restricted-properties, api-usage, configuration
Property name " " is not .	validation	error
Unexpected use of `continue` statement.	validation	info	lint, continue, control-flow, stylistic, oxlint
' ' is marked as ignored but is used.	validation	warning	eslint, oxlint, unused-vars, ignore-pattern, naming
Unreachable code.	validation	warning	eslint, oxlint, control-flow, dead-code
An index signature is preferred over a record.	validation	warning	typescript, oxlint, lint, record-type, index-signature, style
Prefer ` ` over ` `.	validation	error
Unexpected `javascript:` url	validation	warning	lint, eslint, no-script-url, security, xss, csp
Use `toBeDefined` instead.	validation	warning	jest, vitest, oxlint, matcher, defined
Backreference ' ' will be ignored. It references group ' '…	validation	warning	eslint, oxlint, regex, backreference, alternation
Prefer `String#at()` over `String#substring()` when getting…	validation	warning	lint, javascript, strings, code-style, es2022
Unexpected number literal prefix in uppercase and…	validation	warning	oxlint, unicorn, style, hexadecimal, numeric-literal, autofix
`typeof` comparisons should be to string literals.	validation	error	lint, oxlint, eslint, typeof, correctness, operators
Invalid access level is specified or missing.	validation	warning	lint, jsdoc, documentation, access-modifier, oxlint
Public accessibility modifier on	validation	warning	typescript, lint, class, accessibility, oxlint
Split uninitialized ' ' declarations into multiple…	validation	warning	oxlint, eslint, style, variables, declaration
Implied eval. Do not use execScript().	validation	warning	eslint, oxlint, lint, security, eval, legacy
Prefer explicitly define the object shape	validation	warning	typescript, oxlint, lint, ban-types, empty-object-type, type-safety
Prevent usage of ` ` with `Head` component from…	validation	warning	nextjs, seo, pages-router, lint
`expect. ` must be awaited or returned as the last…	validation	error
No root defined for `@property` path.	validation	error
Remove the `./` prefix from the relative URL.	validation	warning	oxlint, unicorn, url, style, config-dependent
Unary operator ' ' used.	validation	error
Confusing combination of non-null assertion and	validation	warning	typescript, lint, non-null-assertion, operators, oxlint
Passing ` ` as the `deleteCount` argument is unnecessary.	validation	error
Wrapping single-element array with `Promise.	validation	error
Do not use ` ` element. Use `<Head />` from `next/head`…	validation	warning	nextjs, seo, pages-router, lint
File extension " " should not be included in the…	validation	error
Prevent synchronous scripts.	validation	warning	nextjs, performance, script, lint
should not match	validation	warning	jest, vitest, oxlint, testing, test-title, regex, naming, config, valid-title
Unexpected erasing operation. This expression will always…	validation	error	oxlint, oxc, arithmetic, logic-bug, javascript, static-analysis
Curly braces are required here.	validation	error
named import not found	validation	error
No named exports found in module	validation	error	lint, oxlint, import-plugin, esm, modules, exports
Parameter ' ' is declared but never used.	validation	warning	eslint, oxlint, unused-vars, parameters
Remove `void` from this union type constituent.	validation	warning	typescript, lint, void, union-type
A control must be associated with a text label.	validation	error
Use `void` only as a return type.	validation	warning	typescript, lint, void, type-annotation
do not access Object.prototype method	validation	error
Do not use `null` comparisons without type-checking…	validation	warning	javascript, eslint, lint, equality, null-handling
' ' is used outside of binding context.	validation	error
Avoid having conditionals in tests	validation	error
extra non-null assertion	validation	warning	typescript, lint, non-null-assertion, redundant-code
Missing JSDoc `@returns` type.	validation	warning	jsdoc, documentation, lint, oxlint
`styled-jsx` should not be used in `pages/_document.js`	validation	warning	nextjs, styled-jsx, pages-router, lint
Array type using ' < >' is forbidden. Use ' []' instead.	validation	info	typescript, oxlint, style, types, autofix, array-type
Missing alternative text.	validation	error	jsx-a11y, accessibility, alt-text, object-embed, react, lint, oxlint
Prop ' ' is not in .	validation	error
Unable to validate computed reference to imported namespace	validation	error
Use `void` only as a return type or generic type argument.	validation	warning	typescript, lint, void, type-annotation
Expect takes at most	validation	warning	jest, vitest, oxlint, testing, arguments, valid-expect
Use `Buffer.alloc()` or `Buffer.from()` instead of the…	validation	error
Checking `switch` discriminant against NaN will never match	validation	error	lint, oxlint, eslint, nan, correctness, switch, control-flow
Exported error name should match error class	validation	error
Missing value for `aria-label` attribute.	validation	error	jsx-a11y, accessibility, aria, alt-text, react, lint, oxlint
Array destructuring may not contain consecutive ignored…	validation	error
unclosed markdown code block in documentation, please close…	exception	error
Curly braces are unnecessary here.	validation	error
`defineEmits` is referencing locally declared variables.	validation	error
Invalid radix parameter, must be an integer between 2 and…	validation	warning	eslint, oxlint, parseint, radix, correctness, lint
The `@typedef` and `@namespace` tags must include a…	validation	error
Unexpected empty static blocks	validation	warning	javascript, eslint, lint, classes, es2022
Use new type literal declaration instead of the old call…	validation	error
Don't use `Array#reduce()` and `Array#reduceRight()`, use…	validation	error
line break count must fit in u32	panic	error
missing `version = "x.y.z"` or `version = "next"` in…	validation	error
The `a` element has `href` and `onClick`.	validation	error
Use `new ()` instead of ` ()	validation	error
Use `void` only as a return type, generic type argument, or…	validation	warning	typescript, lint, void, type-annotation
Mocked modules must be dynamic imported.	validation	error
Prefer `toBeObject()` for object assertions	validation	error
Should not have duplicate prefix	validation	warning	jest, vitest, oxlint, testing, test-title, naming, valid-title
Unexpected return value in callback for	validation	error
Use imports from `vue` instead of `@vue/*`.	validation	error
Use `toBeCalledTimes(1)` or `toHaveBeenCalledTimes(1)`…	validation	error
Array type using ' []' is forbidden for non-simple types…	validation	info	typescript, oxlint, style, types, autofix, array-type
Missing value for `aria-labelledby` attribute.	validation	error	jsx-a11y, accessibility, aria, alt-text, react, lint, oxlint
' ' is defined but never used.	validation	warning	eslint, oxlint, classes, private-fields, dead-code
Prefer `toHaveBeenCalledExactlyOnceWith` over…	validation	error
The use of `toBeCalledTimes(1)` and…	validation	error
is not allowed in test title	validation	warning	jest, vitest, oxlint, testing, test-title, naming, config, valid-title