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/** * @fileoverview Rule to flag references to undeclared variables. * @author Mark Macdonald */ "use strict"; //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Checks if the given node is the argument of a typeof operator. * @param {ASTNode} node The AST node being checked. * @returns {boolean} Whether or not the node is the argument of a typeof operator. */ function hasTypeOfOperator(node) { const parent = node.parent; return parent.type === "UnaryExpression" && parent.operator === "typeof"; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow the use of undeclared variables unless mentioned in `/*global */` comments", recommended: true, url: "https://eslint.org/docs/latest/rules/no-undef" }, schema: [ { type: "object", properties: { typeof: { type: "boolean", default: false } }, additionalProperties: false } ], messages: { undef: "'{{name}}' is not defined." } }, create(context) { const options = context.options[0]; const considerTypeOf = options && options.typeof === true || false; const sourceCode = context.sourceCode; return { "Program:exit"(node) { const globalScope = sourceCode.getScope(node); globalScope.through.forEach(ref => { const identifier = ref.identifier; if (!considerTypeOf && hasTypeOfOperator(identifier)) { return; } context.report({ node: identifier, messageId: "undef", data: identifier }); }); } }; } };