no-throw-literal.js
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/**
* @fileoverview Rule to restrict what can be thrown as an exception.
* @author Dieter Oberkofler
* @copyright 2015 Ian VanSchooten. All rights reserved.
* @copyright 2015 Dieter Oberkofler. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Determine if a node has a possiblity to be an Error object
* @param {ASTNode} node ASTNode to check
* @returns {boolean} True if there is a chance it contains an Error obj
*/
function couldBeError(node) {
switch (node.type) {
case "Identifier":
case "CallExpression":
case "NewExpression":
case "MemberExpression":
case "TaggedTemplateExpression":
case "YieldExpression":
return true; // possibly an error object.
case "AssignmentExpression":
return couldBeError(node.right);
case "SequenceExpression":
var exprs = node.expressions;
return exprs.length !== 0 && couldBeError(exprs[exprs.length - 1]);
case "LogicalExpression":
return couldBeError(node.left) || couldBeError(node.right);
case "ConditionalExpression":
return couldBeError(node.consequent) || couldBeError(node.alternate);
default:
return false;
}
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
return {
"ThrowStatement": function(node) {
if (!couldBeError(node.argument)) {
context.report(node, "Expected an object to be thrown.");
} else if (node.argument.type === "Identifier") {
if (node.argument.name === "undefined") {
context.report(node, "Do not throw undefined.");
}
}
}
};
};
module.exports.schema = [];