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/**
* @fileoverview Flag shouldComponentUpdate when extending PureComponent
*/
'use strict';
const astUtil = require('../util/ast');
const componentUtil = require('../util/componentUtil');
const docsUrl = require('../util/docsUrl');
const report = require('../util/report');
// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------
const messages = {
noShouldCompUpdate: '{{component}} does not need shouldComponentUpdate when extending React.PureComponent.',
};
module.exports = {
meta: {
docs: {
description: 'Flag shouldComponentUpdate when extending PureComponent',
category: 'Possible Errors',
recommended: false,
url: docsUrl('no-redundant-should-component-update'),
},
messages,
schema: [],
},
create(context) {
/**
* Checks for shouldComponentUpdate property
* @param {ASTNode} node The AST node being checked.
* @returns {Boolean} Whether or not the property exists.
*/
function hasShouldComponentUpdate(node) {
const properties = astUtil.getComponentProperties(node);
return properties.some((property) => {
const name = astUtil.getPropertyName(property);
return name === 'shouldComponentUpdate';
});
}
/**
* Get name of node if available
* @param {ASTNode} node The AST node being checked.
* @return {String} The name of the node
*/
function getNodeName(node) {
if (node.id) {
return node.id.name;
}
if (node.parent && node.parent.id) {
return node.parent.id.name;
}
return '';
}
/**
* Checks for violation of rule
* @param {ASTNode} node The AST node being checked.
*/
function checkForViolation(node) {
if (componentUtil.isPureComponent(node, context)) {
const hasScu = hasShouldComponentUpdate(node);
if (hasScu) {
const className = getNodeName(node);
report(context, messages.noShouldCompUpdate, 'noShouldCompUpdate', {
node,
data: {
component: className,
},
});
}
}
}
return {
ClassDeclaration: checkForViolation,
ClassExpression: checkForViolation,
};
},
};