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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('../shared/types').Rule} */ 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.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(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 }; } };