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Edit:
/home/techb158/balavpn.abdallabala.com/node_modules/eslint-plugin-react/lib/rules/jsx-fragments.js
(7043B)
/** * @fileoverview Enforce shorthand or standard form for React fragments. * @author Alex Zherdev */ 'use strict'; const elementType = require('jsx-ast-utils/elementType'); const pragmaUtil = require('../util/pragma'); const variableUtil = require('../util/variable'); const testReactVersion = require('../util/version').testReactVersion; const docsUrl = require('../util/docsUrl'); const report = require('../util/report'); const getText = require('../util/eslint').getText; // ------------------------------------------------------------------------------ // Rule Definition // ------------------------------------------------------------------------------ function replaceNode(source, node, text) { return `${source.slice(0, node.range[0])}${text}${source.slice(node.range[1])}`; } const messages = { fragmentsNotSupported: 'Fragments are only supported starting from React v16.2. Please disable the `react/jsx-fragments` rule in `eslint` settings or upgrade your version of React.', preferPragma: 'Prefer {{react}}.{{fragment}} over fragment shorthand', preferFragment: 'Prefer fragment shorthand over {{react}}.{{fragment}}', }; /** @type {import('eslint').Rule.RuleModule} */ module.exports = { meta: { docs: { description: 'Enforce shorthand or standard form for React fragments', category: 'Stylistic Issues', recommended: false, url: docsUrl('jsx-fragments'), }, fixable: 'code', messages, schema: [{ enum: ['syntax', 'element'], }], }, create(context) { const configuration = context.options[0] || 'syntax'; const reactPragma = pragmaUtil.getFromContext(context); const fragmentPragma = pragmaUtil.getFragmentFromContext(context); const openFragShort = '<>'; const closeFragShort = '</>'; const openFragLong = `<${reactPragma}.${fragmentPragma}>`; const closeFragLong = `</${reactPragma}.${fragmentPragma}>`; function reportOnReactVersion(node) { if (!testReactVersion(context, '>= 16.2.0')) { report(context, messages.fragmentsNotSupported, 'fragmentsNotSupported', { node, }); return true; } return false; } function getFixerToLong(jsxFragment) { if (!jsxFragment.closingFragment || !jsxFragment.openingFragment) { // the old TS parser crashes here // TODO: FIXME: can we fake these two descriptors? return null; } return function fix(fixer) { let source = getText(context); source = replaceNode(source, jsxFragment.closingFragment, closeFragLong); source = replaceNode(source, jsxFragment.openingFragment, openFragLong); const lengthDiff = openFragLong.length - getText(context, jsxFragment.openingFragment).length + closeFragLong.length - getText(context, jsxFragment.closingFragment).length; const range = jsxFragment.range; return fixer.replaceTextRange(range, source.slice(range[0], range[1] + lengthDiff)); }; } function getFixerToShort(jsxElement) { return function fix(fixer) { let source = getText(context); let lengthDiff; if (jsxElement.closingElement) { source = replaceNode(source, jsxElement.closingElement, closeFragShort); source = replaceNode(source, jsxElement.openingElement, openFragShort); lengthDiff = getText(context, jsxElement.openingElement).length - openFragShort.length + getText(context, jsxElement.closingElement).length - closeFragShort.length; } else { source = replaceNode(source, jsxElement.openingElement, `${openFragShort}${closeFragShort}`); lengthDiff = getText(context, jsxElement.openingElement).length - openFragShort.length - closeFragShort.length; } const range = jsxElement.range; return fixer.replaceTextRange(range, source.slice(range[0], range[1] - lengthDiff)); }; } function refersToReactFragment(node, name) { const variableInit = variableUtil.findVariableByName(context, node, name); if (!variableInit) { return false; } // const { Fragment } = React; if (variableInit.type === 'Identifier' && variableInit.name === reactPragma) { return true; } // const Fragment = React.Fragment; if ( variableInit.type === 'MemberExpression' && variableInit.object.type === 'Identifier' && variableInit.object.name === reactPragma && variableInit.property.type === 'Identifier' && variableInit.property.name === fragmentPragma ) { return true; } // const { Fragment } = require('react'); if ( variableInit.callee && variableInit.callee.name === 'require' && variableInit.arguments && variableInit.arguments[0] && variableInit.arguments[0].value === 'react' ) { return true; } return false; } const jsxElements = []; const fragmentNames = new Set([`${reactPragma}.${fragmentPragma}`]); // -------------------------------------------------------------------------- // Public // -------------------------------------------------------------------------- return { JSXElement(node) { jsxElements.push(node); }, JSXFragment(node) { if (reportOnReactVersion(node)) { return; } if (configuration === 'element') { report(context, messages.preferPragma, 'preferPragma', { node, data: { react: reactPragma, fragment: fragmentPragma, }, fix: getFixerToLong(node), }); } }, ImportDeclaration(node) { if (node.source && node.source.value === 'react') { node.specifiers.forEach((spec) => { if ( 'imported' in spec && spec.imported && 'name' in spec.imported && spec.imported.name === fragmentPragma ) { if (spec.local) { fragmentNames.add(spec.local.name); } } }); } }, 'Program:exit'() { jsxElements.forEach((node) => { const openingEl = node.openingElement; const elName = elementType(openingEl); if (fragmentNames.has(elName) || refersToReactFragment(node, elName)) { if (reportOnReactVersion(node)) { return; } const attrs = openingEl.attributes; if (configuration === 'syntax' && !(attrs && attrs.length > 0)) { report(context, messages.preferFragment, 'preferFragment', { node, data: { react: reactPragma, fragment: fragmentPragma, }, fix: getFixerToShort(node), }); } } }); }, }; }, };
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