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63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
/**
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* @fileoverview Prevent variables used in JSX to be marked as unused
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* @author Yannick Croissant
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*/
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'use strict';
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const docsUrl = require('../util/docsUrl');
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const markVariableAsUsed = require('../util/eslint').markVariableAsUsed;
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// ------------------------------------------------------------------------------
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// Rule Definition
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// ------------------------------------------------------------------------------
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const isTagNameRe = /^[a-z]/;
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const isTagName = (name) => isTagNameRe.test(name);
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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// eslint-disable-next-line eslint-plugin/prefer-message-ids -- https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/issues/292
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meta: {
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docs: {
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description: 'Disallow variables used in JSX to be incorrectly marked as unused',
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category: 'Best Practices',
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recommended: true,
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url: docsUrl('jsx-uses-vars'),
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},
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schema: [],
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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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let name;
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if (node.name.namespace) {
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// <Foo:Bar>
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return;
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}
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if (node.name.name) {
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// <Foo>
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name = node.name.name;
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// Exclude lowercase tag names like <div>
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if (isTagName(name)) {
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return;
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}
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} else if (node.name.object) {
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// <Foo...Bar>
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let parent = node.name.object;
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while (parent.object) {
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parent = parent.object;
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}
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name = parent.name;
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} else {
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return;
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}
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markVariableAsUsed(name, node, context);
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},
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};
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},
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};
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