86 lines
2.7 KiB
JavaScript
86 lines
2.7 KiB
JavaScript
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/**
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* @fileoverview Rule to disallow assignments to native objects or read-only global variables
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* @author Ilya Volodin
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*/
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"use strict";
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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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docs: {
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description: "disallow assignments to native objects or read-only global variables",
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category: "Best Practices",
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recommended: true
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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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exceptions: {
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type: "array",
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items: { type: "string" },
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uniqueItems: true
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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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},
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create(context) {
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const config = context.options[0];
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const exceptions = (config && config.exceptions) || [];
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/**
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* Reports write references.
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* @param {Reference} reference - A reference to check.
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* @param {int} index - The index of the reference in the references.
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* @param {Reference[]} references - The array that the reference belongs to.
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* @returns {void}
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*/
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function checkReference(reference, index, references) {
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const identifier = reference.identifier;
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if (reference.init === false &&
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reference.isWrite() &&
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/*
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* Destructuring assignments can have multiple default value,
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* so possibly there are multiple writeable references for the same identifier.
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*/
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(index === 0 || references[index - 1].identifier !== identifier)
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) {
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context.report({
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node: identifier,
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message: "Read-only global '{{name}}' should not be modified.",
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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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* Reports write references if a given variable is read-only builtin.
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* @param {Variable} variable - A variable to check.
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* @returns {void}
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*/
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function checkVariable(variable) {
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if (variable.writeable === false && exceptions.indexOf(variable.name) === -1) {
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variable.references.forEach(checkReference);
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}
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}
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return {
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Program() {
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const globalScope = context.getScope();
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globalScope.variables.forEach(checkVariable);
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}
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};
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}
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};
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