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Dir : ~/var/www/invoice/node_modules/eslint/lib/rules/

Edit File: valid-typeof.js

/**
 * @fileoverview Ensures that the results of typeof are compared against a valid string
 * @author Ian Christian Myers
 */
"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = {
    meta: {
        type: "problem",

docs: {
            description: "enforce comparing `typeof` expressions against valid strings",
            category: "Possible Errors",
            recommended: true,
            url: "https://eslint.org/docs/rules/valid-typeof"
        },

schema: [
            {
                type: "object",
                properties: {
                    requireStringLiterals: {
                        type: "boolean",
                        default: false
                    }
                },
                additionalProperties: false
            }
        ],
        messages: {
            invalidValue: "Invalid typeof comparison value.",
            notString: "Typeof comparisons should be to string literals."
        }
    },

create(context) {

const VALID_TYPES = ["symbol", "undefined", "object", "boolean", "number", "string", "function", "bigint"],
            OPERATORS = ["==", "===", "!=", "!=="];

const requireStringLiterals = context.options[0] && context.options[0].requireStringLiterals;

/**
         * Determines whether a node is a typeof expression.
         * @param {ASTNode} node The node
         * @returns {boolean} `true` if the node is a typeof expression
         */
        function isTypeofExpression(node) {
            return node.type === "UnaryExpression" && node.operator === "typeof";
        }

//--------------------------------------------------------------------------
        // Public
        //--------------------------------------------------------------------------

return {

UnaryExpression(node) {
                if (isTypeofExpression(node)) {
                    const parent = context.getAncestors().pop();

if (parent.type === "BinaryExpression" && OPERATORS.indexOf(parent.operator) !== -1) {
                        const sibling = parent.left === node ? parent.right : parent.left;

if (sibling.type === "Literal" || sibling.type === "TemplateLiteral" && !sibling.expressions.length) {
                            const value = sibling.type === "Literal" ? sibling.value : sibling.quasis[0].value.cooked;

if (VALID_TYPES.indexOf(value) === -1) {
                                context.report({ node: sibling, messageId: "invalidValue" });
                            }
                        } else if (requireStringLiterals && !isTypeofExpression(sibling)) {
                            context.report({ node: sibling, messageId: "notString" });
                        }
                    }
                }
            }

};

}
};