handle-callback-err.js
2.45 KB
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/**
* @fileoverview Ensure handling of errors when we know they exist.
* @author Jamund Ferguson
* @copyright 2015 Mathias Schreck.
* @copyright 2014 Jamund Ferguson. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var errorArgument = context.options[0] || "err";
/**
* Checks if the given argument should be interpreted as a regexp pattern.
* @param {string} stringToCheck The string which should be checked.
* @returns {boolean} Whether or not the string should be interpreted as a pattern.
*/
function isPattern(stringToCheck) {
var firstChar = stringToCheck[0];
return firstChar === "^";
}
/**
* Checks if the given name matches the configured error argument.
* @param {string} name The name which should be compared.
* @returns {boolean} Whether or not the given name matches the configured error variable name.
*/
function matchesConfiguredErrorName(name) {
if (isPattern(errorArgument)) {
var regexp = new RegExp(errorArgument);
return regexp.test(name);
}
return name === errorArgument;
}
/**
* Get the parameters of a given function scope.
* @param {object} scope The function scope.
* @returns {array} All parameters of the given scope.
*/
function getParameters(scope) {
return scope.variables.filter(function(variable) {
return variable.defs[0] && variable.defs[0].type === "Parameter";
});
}
/**
* Check to see if we're handling the error object properly.
* @param {ASTNode} node The AST node to check.
* @returns {void}
*/
function checkForError(node) {
var scope = context.getScope(),
parameters = getParameters(scope),
firstParameter = parameters[0];
if (firstParameter && matchesConfiguredErrorName(firstParameter.name)) {
if (firstParameter.references.length === 0) {
context.report(node, "Expected error to be handled.");
}
}
}
return {
"FunctionDeclaration": checkForError,
"FunctionExpression": checkForError,
"ArrowFunctionExpression": checkForError
};
};
module.exports.schema = [
{
"type": "string"
}
];