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/**
* @fileoverview Rule to flag use of duplicate keys in an object.
* @author Ian Christian Myers
* @copyright 2013 Ian Christian Myers. All rights reserved.
* @copyright 2013 Nicholas C. Zakas. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
return {
"ObjectExpression": function(node) {
// Object that will be a map of properties--safe because we will
// prefix all of the keys.
var nodeProps = Object.create(null);
node.properties.forEach(function(property) {
var keyName = property.key.name || property.key.value,
key = property.kind + "-" + keyName,
checkProperty = (!property.computed || property.key.type === "Literal");
if (checkProperty) {
if (nodeProps[key]) {
context.report(node, "Duplicate key '{{key}}'.", { key: keyName });
} else {
nodeProps[key] = true;
}
}
});
}
};
};
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