no-unsafe-component-will-mount
Rule category
Suspicious.
What it does
Warns usage of UNSAFE_componentWillMount
in class components.
Why is this bad?
Using unsafe lifecycle methods like UNSAFE_componentWillMount
makes your component’s behavior less predictable and are more likely to cause bugs.
Examples
Failing
import React from "react";
class class Example
Example extends React.class React.Component<P = {}, S = {}, SS = any>
Component {
// @warn: Do not use 'UNSAFE_componentWillMount'
Example.UNSAFE_componentWillMount(): void
Called immediately before mounting occurs, and before
{@link
Component.render
}
.
Avoid introducing any side-effects or subscriptions in this method.
This method will not stop working in React 17.
Note: the presence of
{@link
NewLifecycle.getSnapshotBeforeUpdate
getSnapshotBeforeUpdate
}
or
{@link
StaticLifecycle.getDerivedStateFromProps
getDerivedStateFromProps
}
prevents
this from being invoked.UNSAFE_componentWillMount() {
// ...
}
}