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/**
* @fileoverview Rule to disallow assignments to native objects or read-only global variables
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: "suggestion",
defaultOptions: [{ exceptions: [] }],
docs: {
description:
"Disallow assignments to native objects or read-only global variables",
recommended: true,
url: "https://eslint.org/docs/latest/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 sourceCode = context.sourceCode;
const [{ exceptions }] = context.options;
/**
* 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(node) {
const globalScope = sourceCode.getScope(node);
globalScope.variables.forEach(checkVariable);
},
};
},
};