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55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
/**
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* @fileoverview Prevent JSX prop spreading the same expression multiple times
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* @author Simon Schick
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*/
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'use strict';
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const docsUrl = require('../util/docsUrl');
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const report = require('../util/report');
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// ------------------------------------------------------------------------------
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// Rule Definition
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// ------------------------------------------------------------------------------
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const messages = {
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noMultiSpreading: 'Spreading the same expression multiple times is forbidden',
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};
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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meta: {
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docs: {
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description: 'Disallow JSX prop spreading the same identifier multiple times',
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category: 'Best Practices',
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recommended: false,
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url: docsUrl('jsx-props-no-spread-multi'),
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},
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messages,
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},
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create(context) {
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return {
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JSXOpeningElement(node) {
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const spreads = node.attributes.filter(
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(attr) => attr.type === 'JSXSpreadAttribute'
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&& attr.argument.type === 'Identifier'
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);
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if (spreads.length < 2) {
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return;
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}
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// We detect duplicate expressions by their identifier
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const identifierNames = new Set();
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spreads.forEach((spread) => {
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if (identifierNames.has(spread.argument.name)) {
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report(context, messages.noMultiSpreading, 'noMultiSpreading', {
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node: spread,
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});
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}
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identifierNames.add(spread.argument.name);
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});
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},
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};
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},
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};
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