max-nested-callbacks.js
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/**
* @fileoverview Rule to enforce a maximum number of nested callbacks.
* @author Ian Christian Myers
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "enforce a maximum depth that callbacks can be nested",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/max-nested-callbacks"
},
schema: [
{
oneOf: [
{
type: "integer",
minimum: 0
},
{
type: "object",
properties: {
maximum: {
type: "integer",
minimum: 0
},
max: {
type: "integer",
minimum: 0
}
},
additionalProperties: false
}
]
}
],
messages: {
exceed: "Too many nested callbacks ({{num}}). Maximum allowed is {{max}}."
}
},
create(context) {
//--------------------------------------------------------------------------
// Constants
//--------------------------------------------------------------------------
const option = context.options[0];
let THRESHOLD = 10;
if (
typeof option === "object" &&
(Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max"))
) {
THRESHOLD = option.maximum || option.max;
} else if (typeof option === "number") {
THRESHOLD = option;
}
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
const callbackStack = [];
/**
* Checks a given function node for too many callbacks.
* @param {ASTNode} node The node to check.
* @returns {void}
* @private
*/
function checkFunction(node) {
const parent = node.parent;
if (parent.type === "CallExpression") {
callbackStack.push(node);
}
if (callbackStack.length > THRESHOLD) {
const opts = { num: callbackStack.length, max: THRESHOLD };
context.report({ node, messageId: "exceed", data: opts });
}
}
/**
* Pops the call stack.
* @returns {void}
* @private
*/
function popStack() {
callbackStack.pop();
}
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
ArrowFunctionExpression: checkFunction,
"ArrowFunctionExpression:exit": popStack,
FunctionExpression: checkFunction,
"FunctionExpression:exit": popStack
};
}
};