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/**
* @fileoverview Rule to flag when re-assigning native objects
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var config = context.options[0];
var 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) {
var 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,
message: "{{name}} is a read-only native object.",
data: identifier
});
}
}
/**
* Reports write references if a given variable is readonly builtin.
* @param {Variable} variable - A variable to check.
* @returns {void}
*/
function checkVariable(variable) {
if (variable.writeable === false && exceptions.indexOf(variable.name) === -1) {
variable.references.forEach(checkReference);
}
}
return {
"Program": function() {
var globalScope = context.getScope();
globalScope.variables.forEach(checkVariable);
}
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"exceptions": {
"type": "array",
"items": {"type": "string"},
"uniqueItems": true
}
},
"additionalProperties": false
}
];
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