# `react-doctor/three-webgpu-no-legacy-effect-composer`

Legacy EffectComposer used with WebGPURenderer

- **Category:** Bugs
- **Severity:** error
- **Source:** oxlint-plugin-react-doctor
- **Framework:** global
- **Enabled when:** three

## Validate the diagnostic

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

Confirm the reported code matches `react-doctor/three-webgpu-no-legacy-effect-composer`. 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

```ts
import { WebGPURenderer } from "three/webgpu";
import { BloomPass } from "three/addons/postprocessing/BloomPass.js";
import { EffectComposer } from "three/addons/postprocessing/EffectComposer.js";
import { RenderPass } from "three/addons/postprocessing/RenderPass.js";
const renderer = new WebGPURenderer();
const composer = new EffectComposer(renderer);
composer.addPass(new RenderPass(scene, camera));
composer.addPass(new BloomPass());
```

### Corrected pattern

```ts
import { RenderPipeline, WebGPURenderer } from "three/webgpu";
import { pass } from "three/tsl";
import { bloom } from "three/addons/tsl/display/BloomNode.js";
const renderer = new WebGPURenderer();
const scenePass = pass(scene, camera);
const sceneColor = scenePass.getTextureNode("output");
const renderPipeline = new RenderPipeline(renderer);
renderPipeline.outputNode = sceneColor.add(bloom(sceneColor));
```

## 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.

````text
Fix every confirmed `react-doctor/three-webgpu-no-legacy-effect-composer` diagnostic in the current repository.

Required change:
- Use WebGPURenderer's node-based post-processing pipeline instead of the legacy WebGL EffectComposer.

Reference transformation:

Before:
```ts
import { WebGPURenderer } from "three/webgpu";
import { BloomPass } from "three/addons/postprocessing/BloomPass.js";
import { EffectComposer } from "three/addons/postprocessing/EffectComposer.js";
import { RenderPass } from "three/addons/postprocessing/RenderPass.js";
const renderer = new WebGPURenderer();
const composer = new EffectComposer(renderer);
composer.addPass(new RenderPass(scene, camera));
composer.addPass(new BloomPass());
```

After:
```ts
import { RenderPipeline, WebGPURenderer } from "three/webgpu";
import { pass } from "three/tsl";
import { bloom } from "three/addons/tsl/display/BloomNode.js";
const renderer = new WebGPURenderer();
const scenePass = pass(scene, camera);
const sceneColor = scenePass.getTextureNode("output");
const renderPipeline = new RenderPipeline(renderer);
renderPipeline.outputNode = sceneColor.add(bloom(sceneColor));
```

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.
- 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: `three`.

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.
````