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# Prevent usage of setState in componentWillUpdate (no-will-update-set-state) | ||
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Updating the state during the componentWillUpdate step can lead to indeterminate component state and is not allowed. | ||
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## Rule Details | ||
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The following patterns are considered warnings: | ||
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```jsx | ||
var Hello = React.createClass({ | ||
componentWillUpdate: function() { | ||
this.setState({ | ||
name: this.props.name.toUpperCase() | ||
}); | ||
}, | ||
render: function() { | ||
return <div>Hello {this.state.name}</div>; | ||
} | ||
}); | ||
``` | ||
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The following patterns are not considered warnings: | ||
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```jsx | ||
var Hello = React.createClass({ | ||
componentWillUpdate: function() { | ||
this.props.prepareHandler(); | ||
}, | ||
render: function() { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
}); | ||
``` | ||
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```jsx | ||
var Hello = React.createClass({ | ||
componentWillUpdate: function() { | ||
this.prepareHandler(function callback(newName) { | ||
this.setState({ | ||
name: newName | ||
}); | ||
}); | ||
}, | ||
render: function() { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
}); | ||
``` | ||
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## Rule Options | ||
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```js | ||
... | ||
"no-will-update-set-state": [<enabled>, <mode>] | ||
... | ||
``` | ||
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### `disallow-in-func` mode | ||
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By default this rule forbids any call to `this.setState` in `componentWillUpdate` outside of functions. The `disallow-in-func` mode makes this rule more strict by disallowing calls to `this.setState` even within functions. | ||
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The following patterns are considered warnings: | ||
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||
```jsx | ||
var Hello = React.createClass({ | ||
componentDidUpdate: function() { | ||
this.setState({ | ||
name: this.props.name.toUpperCase() | ||
}); | ||
}, | ||
render: function() { | ||
return <div>Hello {this.state.name}</div>; | ||
} | ||
}); | ||
``` | ||
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```jsx | ||
var Hello = React.createClass({ | ||
componentDidUpdate: function() { | ||
this.prepareHandler(function callback(newName) { | ||
this.setState({ | ||
name: newName | ||
}); | ||
}); | ||
}, | ||
render: function() { | ||
return <div>Hello {this.state.name}</div>; | ||
} | ||
}); | ||
``` |
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/** | ||
* @fileoverview Prevent usage of setState in componentWillUpdate | ||
* @author Yannick Croissant | ||
*/ | ||
'use strict'; | ||
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// ------------------------------------------------------------------------------ | ||
// Rule Definition | ||
// ------------------------------------------------------------------------------ | ||
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module.exports = { | ||
meta: { | ||
docs: { | ||
description: 'Prevent usage of setState in componentWillUpdate', | ||
category: 'Best Practices', | ||
recommended: false | ||
}, | ||
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schema: [{ | ||
enum: ['disallow-in-func'] | ||
}] | ||
}, | ||
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create: function(context) { | ||
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var mode = context.options[0] || 'allow-in-func'; | ||
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// -------------------------------------------------------------------------- | ||
// Public | ||
// -------------------------------------------------------------------------- | ||
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return { | ||
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CallExpression: function(node) { | ||
var callee = node.callee; | ||
if ( | ||
callee.type !== 'MemberExpression' || | ||
callee.object.type !== 'ThisExpression' || | ||
callee.property.name !== 'setState' | ||
) { | ||
return; | ||
} | ||
var ancestors = context.getAncestors(callee).reverse(); | ||
var depth = 0; | ||
for (var i = 0, j = ancestors.length; i < j; i++) { | ||
if (/Function(Expression|Declaration)$/.test(ancestors[i].type)) { | ||
depth++; | ||
} | ||
if ( | ||
(ancestors[i].type !== 'Property' && ancestors[i].type !== 'MethodDefinition') || | ||
ancestors[i].key.name !== 'componentWillUpdate' || | ||
(mode !== 'disallow-in-func' && depth > 1) | ||
) { | ||
continue; | ||
} | ||
context.report({ | ||
node: callee, | ||
message: 'Do not use setState in componentWillUpdate' | ||
}); | ||
break; | ||
} | ||
} | ||
}; | ||
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} | ||
}; |
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