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react-doctor/jsx-no-undef

Import the component or fix the typo so the JSX element name resolves to a real binding.

Status
Active
Category
Correctness
Assessment
Evidence-required risk
Required evidence
source code
Default configuration
Enabled
Default severity
error
Show technical metadata
Scope
All supported frameworks
Active when
always
Requirements
react
Priority
89 (P0)
Source
oxlint-plugin-react-doctor
Rule set
oxlint-plugin-react-doctor 0.9.3 (prompt schema 2)
On this page

Validation prompt

Confirm the detector match and collect the required evidence before deciding whether an edit is warranted.

Fires on a JSX opening element whose name resolves to an identifier with no binding in scope: a capitalized plain tag (<App />, <Foo />), or the ROOT object of a member expression regardless of case (<App.Foo />, <appp.foo.Bar /> both fire when the root is unbound). Lowercase intrinsic tags (<img />, <x-gif />), namespaced names (<Foo:Bar />), and the known globals globalThis/window/document/console/React/self/this are skipped.

Suppress when: scope resolution is best-effort: shadowing and same-name imports from multiple modules are approximated, so a name bound somewhere reachable may be accepted even when the chosen binding is wrong; confirm the intended import or declaration actually exists before treating a report as a genuine typo.

Evidence boundary

The diagnostic proves only that the detector’s modeled source pattern matched. It does not prove runtime impact, product intent, rendered failure, or that one remediation is correct.

Establish the environment, repository policy, exceptions, and required rendered or runtime evidence before deciding the occurrence.

Record one outcome:

  • Confirmed failure: The required evidence establishes the violation.
  • Rejected: A documented exception or false-positive predicate applies.
  • Needs evidence: Named evidence can still be collected.
  • Unavailable: Required evidence cannot be collected in this run.
  • Waived with evidence: An authorized, scoped exception applies to an established failure.
  • Observation: The review records an optional tradeoff without claiming a defect.

A waiver records its scope, authority, evidence, and review condition. It is not a pass or false positive.

Default severity is registry metadata. Use the occurrence’s JSON severity after repository configuration when ordering real findings.

Fix prompt

Apply this candidate correction only after the required evidence confirms the risk.

Import the missing component or fix the typo so the element name resolves: add the import (import App from './App') or correct the spelling (<Appp /> -> <App />). For member expressions, ensure the root object is in scope: import the namespace, e.g. import * as Icons from './icons' for <Icons.Star />. If you actually meant an intrinsic/custom HTML element, lowercase the tag name so it is treated as an intrinsic tag rather than a (capitalized) component reference. See https://oxc.rs/docs/guide/usage/linter/rules/react/jsx-no-undef

Repository-wide copy prompt

Use this repository-wide prompt only after validating each occurrence. For one occurrence, use the guidance above.

Show repository-wide prompt

Fix every confirmed react-doctor/jsx-no-undef diagnostic in the current repository.

Required change:

  • Import the missing component or fix the typo so the element name resolves: add the import (import App from './App') or correct the spelling (<Appp /> -> <App />). For member expressions, ensure the root object is in scope: import the namespace, e.g. import * as Icons from './icons' for <Icons.Star />. If you actually meant an intrinsic/custom HTML element, lowercase the tag name so it is treated as an intrinsic tag rather than a (capitalized) component reference. See https://oxc.rs/docs/guide/usage/linter/rules/react/jsx-no-undef.

Validation before editing:

Fires on a JSX opening element whose name resolves to an identifier with no binding in scope: a capitalized plain tag (<App />, <Foo />), or the ROOT object of a member expression regardless of case (<App.Foo />, <appp.foo.Bar /> both fire when the root is unbound). Lowercase intrinsic tags (<img />, <x-gif />), namespaced names (<Foo:Bar />), and the known globals globalThis/window/document/console/React/self/this are skipped.

Suppress when: scope resolution is best-effort: shadowing and same-name imports from multiple modules are approximated, so a name bound somewhere reachable may be accepted even when the chosen binding is wrong; confirm the intended import or declaration actually exists before treating a report as a genuine typo.

Constraints:

  • Make the smallest change that fixes the root cause.
  • Preserve behavior and interfaces unrelated to this diagnostic.
  • Reuse existing project components, utilities, and conventions.
  • Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations.
  • Adapt identifiers and framework details instead of copying blindly.
  • Do not disable the rule or suppress matching code.

Assessment:

  • Record detector evidence, applicability facts, assumptions, missing evidence, and the rule class for this occurrence.
  • Return one outcome: Confirmed failure, Rejected, Needs evidence, Unavailable, Waived with evidence, or Observation.
  • A waiver records the established failure, scope, authority, evidence, and review or expiry condition. It is not a pass or false positive.

Verification:

  • Run focused tests for the changed behavior.
  • Run React Doctor and confirm this diagnostic no longer appears from changed code.
  • Run an unfiltered scan of the affected scope before claiming no cross-category regression.
  • Report the files changed and any checks you could not run.