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

Edit File: no-invalid-this.js

/**
 * @fileoverview A rule to disallow `this` keywords outside of classes or class-like objects.
 * @author Toru Nagashima
 */

"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const astUtils = require("./utils/ast-utils");

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

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

docs: {
            description: "disallow `this` keywords outside of classes or class-like objects",
            category: "Best Practices",
            recommended: false,
            url: "https://eslint.org/docs/rules/no-invalid-this"
        },

schema: [
            {
                type: "object",
                properties: {
                    capIsConstructor: {
                        type: "boolean",
                        default: true
                    }
                },
                additionalProperties: false
            }
        ],

messages: {
            unexpectedThis: "Unexpected 'this'."
        }
    },

create(context) {
        const options = context.options[0] || {};
        const capIsConstructor = options.capIsConstructor !== false;
        const stack = [],
            sourceCode = context.getSourceCode();

/**
         * Gets the current checking context.
         *
         * The return value has a flag that whether or not `this` keyword is valid.
         * The flag is initialized when got at the first time.
         * @returns {{valid: boolean}}
         *   an object which has a flag that whether or not `this` keyword is valid.
         */
        stack.getCurrent = function() {
            const current = this[this.length - 1];

if (!current.init) {
                current.init = true;
                current.valid = !astUtils.isDefaultThisBinding(
                    current.node,
                    sourceCode,
                    { capIsConstructor }
                );
            }
            return current;
        };

/**
         * Pushs new checking context into the stack.
         *
         * The checking context is not initialized yet.
         * Because most functions don't have `this` keyword.
         * When `this` keyword was found, the checking context is initialized.
         * @param {ASTNode} node A function node that was entered.
         * @returns {void}
         */
        function enterFunction(node) {

// `this` can be invalid only under strict mode.
            stack.push({
                init: !context.getScope().isStrict,
                node,
                valid: true
            });
        }

/**
         * Pops the current checking context from the stack.
         * @returns {void}
         */
        function exitFunction() {
            stack.pop();
        }

return {

/*
             * `this` is invalid only under strict mode.
             * Modules is always strict mode.
             */
            Program(node) {
                const scope = context.getScope(),
                    features = context.parserOptions.ecmaFeatures || {};

stack.push({
                    init: true,
                    node,
                    valid: !(
                        scope.isStrict ||
                        node.sourceType === "module" ||
                        (features.globalReturn && scope.childScopes[0].isStrict)
                    )
                });
            },

"Program:exit"() {
                stack.pop();
            },

FunctionDeclaration: enterFunction,
            "FunctionDeclaration:exit": exitFunction,
            FunctionExpression: enterFunction,
            "FunctionExpression:exit": exitFunction,

// Reports if `this` of the current context is invalid.
            ThisExpression(node) {
                const current = stack.getCurrent();

if (current && !current.valid) {
                    context.report({
                        node,
                        messageId: "unexpectedThis"
                    });
                }
            }
        };
    }
};