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Viewing file:     no-global-assign.js (2.91 KB)      -rwxrwxrwx

/**
 * @fileoverview Rule to disallow assignments to native objects or read-only global variables
 * @author Ilya Volodin
 */

"use strict";

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

/** @type {import('../shared/types').Rule} */
module.exports = {
    meta: {
        type: "suggestion",

        docs: {
            description: "Disallow assignments to native objects or read-only global variables",
            recommended: true,
            url: "https://eslint.org/docs/rules/no-global-assign"
        },

        schema: [
            {
                type: "object",
                properties: {
                    exceptions: {
                        type: "array",
                        items: { type: "string" },
                        uniqueItems: true
                    }
                },
                additionalProperties: false
            }
        ],

        messages: {
            globalShouldNotBeModified: "Read-only global '{{name}}' should not be modified."
        }
    },

    create(context) {
        const config = context.options[0];
        const exceptions = (config && config.exceptions) || [];

        /**
         * Reports write references.
         * @param {Reference} reference A reference to check.
         * @param {int} index The index of the reference in the references.
         * @param {Reference[]} references The array that the reference belongs to.
         * @returns {void}
         */
        function checkReference(reference, index, references) {
            const identifier = reference.identifier;

            if (reference.init === false &&
                reference.isWrite() &&

                /*
                 * Destructuring assignments can have multiple default value,
                 * so possibly there are multiple writeable references for the same identifier.
                 */
                (index === 0 || references[index - 1].identifier !== identifier)
            ) {
                context.report({
                    node: identifier,
                    messageId: "globalShouldNotBeModified",
                    data: {
                        name: identifier.name
                    }
                });
            }
        }

        /**
         * Reports write references if a given variable is read-only builtin.
         * @param {Variable} variable A variable to check.
         * @returns {void}
         */
        function checkVariable(variable) {
            if (variable.writeable === false && !exceptions.includes(variable.name)) {
                variable.references.forEach(checkReference);
            }
        }

        return {
            Program() {
                const globalScope = context.getScope();

                globalScope.variables.forEach(checkVariable);
            }
        };
    }
};