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