79 lines
2.2 KiB
JavaScript
79 lines
2.2 KiB
JavaScript
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/**
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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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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "disallow the use of undeclared variables unless mentioned in `/*global */` comments",
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category: "Variables",
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recommended: true,
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url: "https://eslint.org/docs/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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default: false
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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 options = context.options[0];
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const considerTypeOf = options && options.typeof === true || false;
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return {
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"Program:exit"(/* node */) {
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const globalScope = context.getScope();
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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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