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/**
* @fileoverview Rule to flag references to undeclared variables.
* @author Mark Macdonald
* @copyright 2015 Nicholas C. Zakas. All rights reserved.
* @copyright 2013 Mark Macdonald. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Checks if the given node is the argument of a typeof operator.
* @param {ASTNode} node The AST node being checked.
* @returns {boolean} Whether or not the node is the argument of a typeof operator.
*/
function hasTypeOfOperator(node) {
var parent = node.parent;
return parent.type === "UnaryExpression" && parent.operator === "typeof";
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var options = context.options[0];
var considerTypeOf = options && options.typeof === true || false;
return {
"Program:exit": function(/* node */) {
var globalScope = context.getScope();
globalScope.through.forEach(function(ref) {
var identifier = ref.identifier;
if (!considerTypeOf && hasTypeOfOperator(identifier)) {
return;
}
context.report({
node: identifier,
message: "'{{name}}' is not defined.",
data: identifier
});
});
}
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"typeof": {
"type": "boolean"
}
},
"additionalProperties": false
}
];
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