React Spread

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React Spread

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var component = < Component foo = { x } bar = { y } /> ;

var component = < Component /> ;
component . props . foo = x ; // bad
component . props . bar = y ; // also bad

var props = {};
props . foo = x ;
props . bar = y ;
var component = < Component {... props } /> ;

var props = { foo : 'default' };
var component = < Component {... props } foo = { 'override' } /> ;
console . log ( component . props . foo ); // 'override'

A Facebook & Instagram collaboration.
Acknowledgements

© 2013–2016 Facebook Inc.
Documentation licensed under CC BY 4.0 .

If you know all the properties that you want to place on a component ahead of time, it is easy to use JSX:
If you don't know which properties you want to set, you might be tempted to add them onto the object later:
This is an anti-pattern because it means that we can't help you check the right propTypes until way later. This means that your propTypes errors end up with a cryptic stack trace.
The props should be considered immutable. Mutating the props object somewhere else could cause unexpected consequences so ideally it would be a frozen object at this point.
Now you can use a new feature of JSX called spread attributes:
The properties of the object that you pass in are copied onto the component's props.
You can use this multiple times or combine it with other attributes. The specification order is important. Later attributes override previous ones.
The ... operator (or spread operator) is already supported for arrays in ES6 . There is also an ECMAScript proposal for Object Rest and Spread Properties . We're taking advantage of these supported and developing standards in order to provide a cleaner syntax in JSX.

ES6 Spread Operator in React by Example: Props and setState | Techiediaries
JSX Spread Attributes | React
eslint-plugin- react /jsx-props-no- spreading .md at master...
Using the spread operator in React setState | by Jason Arnold | Medium
Using Destructure and Spread in React Components | Building SPAs

yannickcr

/

eslint-plugin-react

ljharb

[Docs] make example descriptions consistent

Latest commit
fd94b95
Oct 20, 2020

History

< App { ... props } />
< MyCustomComponent { ... props } some_other_prop = { some_other_prop } />
< img { ... props } />
const { src , alt } = props ;
const { one_prop , two_prop } = otherProps ;
< MyCustomComponent one_prop = { one_prop } two_prop = { two_prop } />
< img src = { src } alt = { alt } />
...
"react/jsx-props-no-spreading" : [ < enabled > , {
"html" : "ignore" | "enforce" ,
"custom" : "ignore" | "enforce" ,
"explicitSpread" : "ignore" | "enforce" ,
"exceptions" : [ < string > ]
} ]
...
< MyCustomComponent { ... props } />
< MyCustomComponent { ... props } />
< img { ... { prop1 , prop2 , prop3 } } />
{ "exceptions" : [ "Image" , "img" ] }
const { src , alt } = props ;
< Image { ... props } />
< img { ... props } />
< MyCustomComponent { ... props } />
{ "html" : "ignore" , "exceptions" : [ "MyCustomComponent" , "img" ] }
const { src , alt } = props ;
const { one_prop , two_prop } = otherProps ;
< img src = { src } alt = { alt } />
< MyCustomComponent { ... otherProps } />

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Enforces that there is no spreading for any JSX attribute. This enhances readability of code by being more explicit about what props are received by the component. It is also good for maintainability by avoiding passing unintentional extra props and allowing react to emit warnings when invalid HTML props are passed to HTML elements.
Examples of incorrect code for this rule:
Examples of correct code for this rule:
html set to ignore will ignore all html jsx tags like div , img etc. Default is set to enforce .
Examples of correct code for this rule, when html is set to ignore :
Examples of incorrect code for this rule, when html is set to ignore :
custom set to ignore will ignore all custom jsx tags like App , MyCustomComponent etc. Default is set to enforce .
Examples of correct code for this rule, when custom is set to ignore :
Examples of incorrect code for this rule, when custom is set to ignore :
explicitSpread set to ignore will ignore spread operators that are explicilty listing all object properties within that spread. Default is set to enforce .
Examples of correct code for this rule, when explicitSpread is set to ignore :
An "exception" will always flip the resulting html or custom setting for that component - ie, html set to ignore , with an exception of div will enforce on an div ; custom set to enforce with an exception of Foo will ignore Foo .
Examples of correct code for this rule:
Examples of incorrect code for this rule:
Examples of correct code for this rule:
Examples of incorrect code for this rule:
If you are not using JSX or have lots of props to be passed or the props spreading is used inside HOC.

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