`react-doctor/no-srcset-without-sizes`

Responsive image omits sizes

Category: Performance
Severity: warn
Source: oxlint-plugin-react-doctor
Framework: global
Enabled when: react
Default: Enabled

Validate the diagnostic

Confirm the reported code matches this rule before you edit it.

Confirm the reported code matches react-doctor/no-srcset-without-sizes. Compare it with the Before example and verify the same API, framework, and execution context. Treat it as a false positive only when one of those conditions differs.

Compare the code

The corrected pattern shows a focused way to address the diagnostic.

Reported pattern

<img
  srcSet="hero-640.jpg 640w, hero-1280.jpg 1280w"
  alt=""
/>

Corrected pattern

<img
  srcSet="hero-640.jpg 640w, hero-1280.jpg 1280w"
  sizes="(min-width: 60rem) 50vw, 100vw"
  alt=""
/>

How to fix

Use the corrected pattern as a reference. Preserve behavior that the rule does not require you to change.

Copyable fix prompt

Copy this self-contained prompt into your coding agent after you confirm the diagnostic.

Fix every confirmed react-doctor/no-srcset-without-sizes diagnostic in the current repository. Required change: - Add a sizes attribute that describes the image's rendered width at each responsive breakpoint.

Reference transformation:Before:

<img
  srcSet="hero-640.jpg 640w, hero-1280.jpg 1280w"
  alt=""
/>

After:

<img
  srcSet="hero-640.jpg 640w, hero-1280.jpg 1280w"
  sizes="(min-width: 60rem) 50vw, 100vw"
  alt=""
/>

Constraints: - Confirm the reported code matches the Before pattern. - 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. - Preserve resource ownership and cleanup. Do not move work into a hotter render or frame path. - 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: react. Verification: - Run focused tests for the changed behavior. - Run React Doctor and confirm this diagnostic no longer appears. - Report the files changed and any checks you could not run.

More Performance rules from the rules reference:

react-doctor/no-sync-xhr: Synchronous XMLHttpRequest
react-doctor/no-tailwind-layout-transition: Animating a layout property
react-doctor/no-transition-all: List specific properties: `transition: "opacity 200ms, transform 200ms"` — or in Tailwind use `transition-colors`, `transition-opacity`, or `transition-transform`
react-doctor/no-unbounded-animation-frame-loop: Animation frame loop has no stop path
react-doctor/no-undeferred-third-party: Use `next/script` with `strategy="lazyOnload"` or add the `defer` attribute

react-doctor/no-srcset-without-sizes