no-direct-mutation-state.js
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/**
* @fileoverview Prevent usage of setState in componentDidMount
* @author David Petersen
*/
'use strict';
var Components = require('../util/Components');
// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------
module.exports = Components.detect(function(context, components, utils) {
/**
* Checks if the component is valid
* @param {Object} component The component to process
* @returns {Boolean} True if the component is valid, false if not.
*/
function isValid(component) {
return Boolean(component && !component.mutateSetState);
}
/**
* Reports undeclared proptypes for a given component
* @param {Object} component The component to process
*/
function reportMutations(component) {
var mutation;
for (var i = 0, j = component.mutations.length; i < j; i++) {
mutation = component.mutations[i];
context.report(mutation, 'Do not mutate state directly. Use setState().');
}
}
// --------------------------------------------------------------------------
// Public
// --------------------------------------------------------------------------
return {
AssignmentExpression: function(node) {
var item;
if (!node.left || !node.left.object || !node.left.object.object) {
return;
}
item = node.left.object;
while (item.object.property) {
item = item.object;
}
if (
item.object.type === 'ThisExpression' &&
item.property.name === 'state'
) {
var component = components.get(utils.getParentComponent());
var mutations = component && component.mutations || [];
mutations.push(node.left.object);
components.set(node, {
mutateSetState: true,
mutations: mutations
});
}
},
'Program:exit': function() {
var list = components.list();
for (var component in list) {
if (!list.hasOwnProperty(component) || isValid(list[component])) {
continue;
}
reportMutations(list[component]);
}
}
};
});