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react-doctor/rn-no-single-element-style-array

Use `style={value}` instead of `style={[value]}`: single-element arrays add unnecessary allocation

Status
Active
Category
React Native
Assessment
Evidence-required risk
Required evidence
source code
Default configuration
Enabled
Default severity
warn
Show technical metadata
Scope
React Native
Active when
framework=react-native and capabilities=react-native
Requirements
react-native
Tags
react-native, test-noise
Priority
22 (P3)
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.

The detector reports a JSX attribute named style or ending in Style whose value is an array literal with one element. For a React Native host style prop, unwrapping normally preserves behavior. For a custom component prop such as contentStyle or thumbStyle, inspect its TypeScript type or implementation first: it may intentionally require an array, inspect array identity, or concatenate entries itself.

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.

For a confirmed React Native style-compatible prop, drop the surrounding brackets so style={[expr]} becomes style={expr}. Keep the array when the custom prop contract requires one or its implementation observes array semantics. Reintroduce composition only when multiple style values are actually present. See https://reactnative.dev/docs/style

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/rn-no-single-element-style-array diagnostic in the current repository.

Required change:

  • For a confirmed React Native style-compatible prop, drop the surrounding brackets so style={[expr]} becomes style={expr}. Keep the array when the custom prop contract requires one or its implementation observes array semantics. Reintroduce composition only when multiple style values are actually present. See https://reactnative.dev/docs/style.

Validation before editing:

The detector reports a JSX attribute named style or ending in Style whose value is an array literal with one element. For a React Native host style prop, unwrapping normally preserves behavior. For a custom component prop such as contentStyle or thumbStyle, inspect its TypeScript type or implementation first: it may intentionally require an array, inspect array identity, or concatenate entries itself.

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.
  • Before editing, inspect the manifest, lockfile, native app configuration, React Native and Expo versions, and New Architecture status.
  • Also inspect the Reanimated major, installed list-library majors, and every affected platform-specific file.
  • Do not add or upgrade a native dependency, change linking, or alter Pods/Gradle setup unless explicitly authorized.
  • Do not enable the New Architecture or change Expo/native configuration unless explicitly authorized.
  • Preserve navigation, gesture, keyboard, safe-area, accessibility, lifecycle, and platform semantics; do not treat them as file-local import substitutions.
  • Verify behavior in a release build on each affected device platform in scope. Name any unavailable platform instead of claiming it passed.
  • Adapt identifiers and framework details instead of copying blindly.
  • Do not disable the rule or suppress matching code.
  • Confirm this rule is enabled for the project: framework=react-native and capabilities=react-native.

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.