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73 lines
2.1 KiB
73 lines
2.1 KiB
/**
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* @fileoverview Rule to flag when re-assigning native objects
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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 = function(context) {
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var config = context.options[0];
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var 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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var identifier = reference.identifier;
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if (reference.init === false &&
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reference.isWrite() &&
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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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(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: "{{name}} is a read-only native object.",
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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 readonly 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": function() {
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var 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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module.exports.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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