96 lines
2.9 KiB
JavaScript
96 lines
2.9 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview Ensure handling of errors when we know they exist.
|
||
|
|
* @author Jamund Ferguson
|
||
|
|
*/
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
type: "suggestion",
|
||
|
|
|
||
|
|
docs: {
|
||
|
|
description: "require error handling in callbacks",
|
||
|
|
category: "Node.js and CommonJS",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/handle-callback-err"
|
||
|
|
},
|
||
|
|
|
||
|
|
schema: [
|
||
|
|
{
|
||
|
|
type: "string"
|
||
|
|
}
|
||
|
|
],
|
||
|
|
messages: {
|
||
|
|
expected: "Expected error to be handled."
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
|
||
|
|
const 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) {
|
||
|
|
const 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)) {
|
||
|
|
const regexp = new RegExp(errorArgument, "u");
|
||
|
|
|
||
|
|
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(variable => 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) {
|
||
|
|
const scope = context.getScope(),
|
||
|
|
parameters = getParameters(scope),
|
||
|
|
firstParameter = parameters[0];
|
||
|
|
|
||
|
|
if (firstParameter && matchesConfiguredErrorName(firstParameter.name)) {
|
||
|
|
if (firstParameter.references.length === 0) {
|
||
|
|
context.report({ node, messageId: "expected" });
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
FunctionDeclaration: checkForError,
|
||
|
|
FunctionExpression: checkForError,
|
||
|
|
ArrowFunctionExpression: checkForError
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|