react-doctor/preact-no-render-arguments

Drop render's positional params and read this.props / this.state inside render() instead

Validation prompt

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

Fires on a non-static instance MethodDefinition named render (kind 'method', static !== true) whose owning class extends Component or PureComponent: imported from preact, or referenced as the Preact namespace member Preact.Component / Preact.PureComponent, or the React.Component shape that isEs6Component recognizes (e.g. preact/compat): when that render's FunctionExpression declares at least one runtime parameter (props, or props plus state). A leading TypeScript this: type-only parameter is stripped first, so it does not count. False positive boundary mirroring the valid fixtures: parameterless render() reading this.props/this.state; a render(target) on a plain class that does NOT extend a Component/PureComponent base; a function component or arrow assigned const render = (props) => ...; a static render(input) utility sharing the name; and render(this: Hello) where the only param is the type-only this binding with an otherwise empty runtime arg list.

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.

Remove the positional parameter(s) from the lifecycle render() and read the same values off the instance instead: change render(props, state) { return <h1>{props.name} {state.count}</h1>; } to render() { return <h1>{this.props.name} {this.state.count}</h1>; }. This types cleanly via Component<Props, State>, keeps render() consistent with every other lifecycle method, and survives a switch to preact/compat where render() takes no arguments. Leave a genuine this: type annotation in place but delete the user-declared props/state params after it. See https://preactjs.com/guide/v10/components/

Repository-wide copy prompt

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