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/**
* @fileoverview Rule to flag when a function has too many parameters
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
const { upperCaseFirst } = require("../shared/string-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: "suggestion",
docs: {
description:
"Enforce a maximum number of parameters in function definitions",
recommended: false,
url: "https://eslint.org/docs/latest/rules/max-params",
},
schema: [
{
oneOf: [
{
type: "integer",
minimum: 0,
},
{
type: "object",
properties: {
maximum: {
type: "integer",
minimum: 0,
},
max: {
type: "integer",
minimum: 0,
},
},
additionalProperties: false,
},
],
},
],
messages: {
exceed: "{{name}} has too many parameters ({{count}}). Maximum allowed is {{max}}.",
},
},
create(context) {
const sourceCode = context.sourceCode;
const option = context.options[0];
let numParams = 3;
if (
typeof option === "object" &&
(Object.hasOwn(option, "maximum") || Object.hasOwn(option, "max"))
) {
numParams = option.maximum || option.max;
}
if (typeof option === "number") {
numParams = option;
}
/**
* Checks a function to see if it has too many parameters.
* @param {ASTNode} node The node to check.
* @returns {void}
* @private
*/
function checkFunction(node) {
if (node.params.length > numParams) {
context.report({
loc: astUtils.getFunctionHeadLoc(node, sourceCode),
node,
messageId: "exceed",
data: {
name: upperCaseFirst(
astUtils.getFunctionNameWithKind(node),
),
count: node.params.length,
max: numParams,
},
});
}
}
return {
FunctionDeclaration: checkFunction,
ArrowFunctionExpression: checkFunction,
FunctionExpression: checkFunction,
};
},
};