116 lines
3.0 KiB
JavaScript
116 lines
3.0 KiB
JavaScript
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/**
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* @fileoverview Disallow undeclared variables in JSX
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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 jsxUtil = require('../util/jsx');
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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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undefined: '\'{{identifier}}\' is not defined.',
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};
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module.exports = {
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meta: {
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docs: {
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description: 'Disallow undeclared variables in JSX',
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category: 'Possible Errors',
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recommended: true,
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url: docsUrl('jsx-no-undef'),
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},
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messages,
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schema: [{
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type: 'object',
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properties: {
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allowGlobals: {
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type: 'boolean',
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},
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},
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additionalProperties: false,
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}],
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},
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create(context) {
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const config = context.options[0] || {};
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const allowGlobals = config.allowGlobals || false;
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/**
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* Compare an identifier with the variables declared in the scope
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* @param {ASTNode} node - Identifier or JSXIdentifier node
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* @returns {void}
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*/
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function checkIdentifierInJSX(node) {
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let scope = context.getScope();
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const sourceCode = context.getSourceCode();
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const sourceType = sourceCode.ast.sourceType;
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const scopeUpperBound = !allowGlobals && sourceType === 'module' ? 'module' : 'global';
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let variables = scope.variables;
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let i;
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let len;
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// Ignore 'this' keyword (also maked as JSXIdentifier when used in JSX)
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if (node.name === 'this') {
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return;
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}
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while (scope.type !== scopeUpperBound && scope.type !== 'global') {
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scope = scope.upper;
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variables = scope.variables.concat(variables);
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}
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if (scope.childScopes.length) {
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variables = scope.childScopes[0].variables.concat(variables);
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// Temporary fix for babel-eslint
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if (scope.childScopes[0].childScopes.length) {
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variables = scope.childScopes[0].childScopes[0].variables.concat(variables);
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}
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}
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for (i = 0, len = variables.length; i < len; i++) {
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if (variables[i].name === node.name) {
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return;
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}
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}
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report(context, messages.undefined, 'undefined', {
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node,
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data: {
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identifier: node.name,
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},
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});
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}
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return {
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JSXOpeningElement(node) {
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switch (node.name.type) {
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case 'JSXIdentifier':
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if (jsxUtil.isDOMComponent(node)) {
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return;
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}
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node = node.name;
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break;
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case 'JSXMemberExpression':
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node = node.name;
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do {
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node = node.object;
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} while (node && node.type !== 'JSXIdentifier');
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break;
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case 'JSXNamespacedName':
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return;
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default:
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break;
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}
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checkIdentifierInJSX(node);
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},
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};
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},
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};
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