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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) || [];
/**
* Gets the names of writeable built-in variables.
* @param {escope.Scope} scope - A scope to get.
* @returns {object} A map that its key is variable names.
*/
function getBuiltinGlobals(scope) {
return scope.variables.reduce(function(retv, variable) {
if (variable.writeable === false && variable.name !== "__proto__") {
retv[variable.name] = true;
}
return retv;
}, Object.create(null));
}
/**
* Reports if a given reference's name is same as native object's.
* @param {object} builtins - A map that its key is a variable name.
* @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 checkThroughReference(builtins, reference, index, references) {
var identifier = reference.identifier;
if (identifier &&
builtins[identifier.name] &&
exceptions.indexOf(identifier.name) === -1 &&
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(
identifier,
"{{name}} is a read-only native object.",
{name: identifier.name});
}
}
return {
// Checks assignments of global variables.
// References to implicit global variables are not resolved,
// so those are in the `through` of the global scope.
"Program": function() {
var globalScope = context.getScope();
var builtins = getBuiltinGlobals(globalScope);
globalScope.through.forEach(checkThroughReference.bind(null, builtins));
}
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"exceptions": {
"type": "array",
"items": {"type": "string"},
"uniqueItems": true
}
},
"additionalProperties": false
}
];
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